KR102780948B1 - A radioactive waste resin mixture treatment system for decontamination of radioactive liquid waste - Google Patents

Abstract

The present invention relates to a waste resin mixture treatment system for decontamination of radioactive liquid waste, and its purpose is to separate radioactive waste resin and waste mixture from a radioactive waste resin mixture generated in a nuclear power plant, desorb radioactive nuclides from the separated radioactive waste resin, and recover and treat the desorbed radionuclides, while greatly improving the heating reaction rate without the risk of explosion or fire, while reducing carbonization of the waste resin and dust generation, and to manufacture the system with a movable volume so that waste resin separation and radionuclide desorption treatment for the radioactive waste resin mixture can be performed quickly on site, and its configuration is to be connected to the radioactive waste resin discharge pipe and inlet pipe of the radioactive waste resin mixture storage tank of the nuclear power plant, respectively, and to suck water containing radioactive waste resin through the radioactive waste resin discharge pipe, discharge water mixed with radioactive waste resin into the radioactive waste resin mixture storage tank through the inlet pipe, temporarily store the radioactive waste resin, and discharge the temporarily stored radioactive waste resin. A radioactive waste resin extraction device which supplies radioactive waste resin; a radioactive waste resin inlet, a waste resin outlet, an air exhaust port, ^{a 14} _CO2- containing gas exhaust port, a blowing and transporting unit, and a heating means, the device having a cylindrical shape and an internal cavity, the radioactive waste resin being supplied from the radioactive waste resin extraction device, the radioactive waste resin being heated by the heating means to separate ¹⁴ _CO2 -containing gas from the radioactive waste resin, and the separated ¹⁴ _CO2 -containing gas being exhausted through the ¹⁴ _CO2- containing gas exhaust port, and the waste resin from which ^{the 14} _CO2 -containing gas is separated by the heating reaction being dried by the blowing unit and at the same time transported to the waste resin outlet by the transporting unit for discharge; a radioactive waste resin heating reactor; ^A vessel having an inlet for introducing ¹⁴ CO ₂ containing gas delivered through an exhaust port of a radioactive waste resin heating reactor, an exhaust port for exhausting ¹⁴ CO ₂ gas from which moisture and dust have been removed, and a drain port _for draining condensate, wherein the condensate is stored inside, and a gas-water separation device which separates moisture and dust from the ¹⁴ CO ₂ containing gas flowing into the interior through the inlet port and exhausts ^{the 14} CO ₂ gas from which moisture and dust have been separated through the exhaust port in a manner that the inlet port is connected to ^{the 14} CO ₂ containing gas exhaust port of the radioactive waste resin heating reactor through a connection pipe; a liquefied gas storage device which is connected to the exhaust port of the gas-water separation device through a connection pipe and liquefies and stores ¹⁴ CO ₂ gas from which moisture and dust have been removed, which flows in through the exhaust port of the gas-water separation device; A vacuum pump means which is connected in communication with the air exhaust port of the radioactive waste resin heating reactor and sucks in internal air so that the inside of the radioactive waste resin heating reactor becomes a preset pressure state; A ^{14 CO 2 detection means which is mounted on the 14} CO ₂ containing gas exhaust port of the radioactive waste resin heating reactor and detects ¹⁴ CO ₂ and transmits a detection signal; First ^{to fourth} _{electromagnetic} valves which are respectively mounted on the radioactive waste resin inlet, the waste resin outlet, the vacuum exhaust port, and the gas exhaust port of the radioactive waste resin heating reactor and open and close the radioactive waste resin inlet, the waste resin outlet, the vacuum exhaust port, and the gas exhaust port, respectively; The present invention is characterized by comprising: a control unit which is respectively connected to the radioactive waste resin extraction device, the radioactive waste resin heating reactor, the liquefied gas storage device, the vacuum pump means, ^{the 14} _CO2 detection means, and the first to fourth electronic valves, and which controls the operation of the radioactive waste resin extraction device, the radioactive waste resin heating reactor, the liquefied gas storage device, the vacuum pump means, and the first to fourth electronic valves; and a control panel which has a display unit which displays information and images, and a command input unit which inputs control commands, and which is connected to the control unit and displays various types of information and images received from the control unit on the display unit, and at the same time inputs a control command input by an operator through the command input unit into the control unit.

Description

{A radioactive waste resin mixture treatment system for decontamination of radioactive liquid waste}

The present invention relates to a waste resin mixture processing system for decontamination of radioactive liquid waste, and more particularly, to a waste resin mixture processing system for decontamination of radioactive liquid waste, which extracts only radioactive waste ion exchange resin (hereinafter, “radioactive waste resin mixture”) from a radioactive waste resin mixture storage tank in which a radioactive waste resin mixture generated from a nuclear power plant is stored (hereinafter, “radioactive waste resin” refers to radioactive waste resin before a heating reaction, and “waste resin” refers to radioactive waste ion exchange resin after a heating reaction has been completed), and heats the extracted radioactive waste resin in a vacuum state to significantly improve the heating reaction rate in which a gas containing ¹⁴ _CO2 is separated from the radioactive waste resin, and also removes moisture and dust contained in _the separated ¹⁴ _CO2- containing gas, and stores the obtained ¹⁴ CO2 gas as liquefied ¹⁴ _CO2 gas so that it can be recycled.

Nuclear power plants (hereinafter referred to as “NPPs”) generate various types of radioactive waste, and among these types of radioactive waste, moderators, coolants, and cooling water are used when exchanging nuclear fuel. At this time, the cooling water becomes contaminated with radioactive ions due to the decay of nuclides and the release of radiation. Therefore, during operation, nuclear power plants use porous polymer ion exchange resins to capture radioactive ions dissolved in a liquid phase. Activated carbon and zeolite are also used to capture radioactive ions. The used polymer ion exchange resins, activated carbon, and zeolite are mixed and stored in large storage tanks. The radioactive waste resin mixture stored in this manner is separated into a radioactive waste mixture of radioactive waste resin, activated carbon, and zeolite, and it is necessary to remove C-14 (radiocarbon) and process it for final disposal of the separated radioactive waste resin.

In order to remove C-14 from the above-mentioned radioactive waste resin, various efforts have been made in the relevant technical field, and as one of the results of such efforts, there is Patent Application No. 0-2010-0035834 (Title of the invention: Waste resin treatment system for reducing the generation of high-level radioactive waste resin from a heavy water reactor nuclear power plant) (hereinafter referred to as “Previous invention 1”).

This prior art invention 1 is a waste resin treatment system of a heavy water reactor nuclear power plant, which passes moderator heavy water circulated in a moderator system of the heavy water reactor nuclear power plant through an ion exchange resin tower to remove cationic radionuclides and anionic radionuclides, and stores waste resin generated from the ion exchange resin tower in a waste resin storage tank together with waste resin generated from other systems, wherein a C-14 capture waste resin dedicated tank is further provided separately from the waste resin storage tank, so that waste resin discharged from the ion exchange resin tower of the moderator system is stored in the C-14 capture waste resin dedicated tank, and waste resin discharged from other systems is stored in the existing waste resin storage tank.

However, the prior art invention 1 having the above configuration is intended to reduce the amount of high-level radioactive waste by storing high-level radioactive waste generated from a moderator system and relatively low-level radioactive waste generated from a heat transport system in separate tanks, but has the problem that it does not have a configuration for removing C-14 from the generated high-level radioactive waste.

To solve the problems of the above-mentioned prior art invention 1, there is Patent Application No. 10-2022-0138546 (Title of the invention: Device for separating waste resin from a waste resin mixture generated from a nuclear power plant, desorbing C-14, and recovering it) (hereinafter referred to as “prior art invention 2”).

The above-described prior art invention 2 comprises: a waste resin mixture temporary storage tank for storing a certain amount of waste resin mixture transferred from a waste resin mixture storage tank; a waste liquid storage tank for storing waste liquid generated in a waste resin mixture separation process; a waste resin mixture separation tank for separating waste resin from the waste resin mixture transferred from the waste resin mixture temporary storage tank; a waste mixture storage tank for storing a mixture other than waste resin separated from the waste resin mixture separation tank; a waste resin storage tank for storing waste resin separated from the waste resin mixture separation tank; a microwave reactor for irradiating microwaves to the waste resin transferred from the waste resin storage tank to separate a gas containing ¹⁴ _CO2 ; a heat exchanger for removing moisture from the gas containing ¹⁴ _CO2 transferred from the microwave reactor; A first adsorption tower through which a gas containing ¹⁴ _CO2 from which moisture has been removed is transferred and through which ¹⁴ _CO2 is adsorbed and removed by an adsorbent; a first adsorption tower connecting pipe connecting the first adsorption tower and the microwave reactor to transfer the gas after ¹⁴ _CO2 adsorption passing through the first adsorption tower to the microwave reactor; a buffer tank connected to the front end of the first adsorption tower and storing the gas after ¹⁴ _CO2 adsorption; a second adsorption tower through which the gas after ¹⁴ _CO2 adsorption stored in the buffer tank is transferred and through which ¹⁴ _CO2 is additionally adsorbed by an adsorbent; Including, ^{the 14} _CO2 -containing gas separated in the microwave reactor passes through the heat exchanger and the first adsorption tower and then flows back into the microwave reactor in a first circulation, and a shut-off valve is installed between the front end of the first adsorption tower and the buffer tank, and when the _CO2 concentration measured inside the pipe in the front end of the first adsorption tower is below a predetermined value, the shut-off valve is opened so that the gas after ¹⁴ _CO2 adsorption is circulated only between the buffer tank and the second adsorption tower in a second circulation.

The prior art invention 2 having the above configuration temporarily stores radioactive waste mixture withdrawn from a radioactive waste mixture storage tank of a nuclear power plant in a waste mixture temporary storage tank, then sequentially withdraws the radioactive waste mixture being temporarily stored and passes it through a waste mixture separation tank to separate it into radioactive waste resin and a non-radioactive waste resin mixture, the separated radioactive waste resin mixture is separately drum-processed, the remaining radioactive waste resin is heated and reacted at atmospheric pressure to separate ¹⁴ _CO2 -containing gas from the radioactive waste resin, and the 14 CO2-containing gas contained in the separated ¹⁴ _CO2- containing gas is absorbed using an absorbent, and the waste resin from which ^{the 14 CO2} _{- containing} gas is separated is separately drum-processed, thereby processing the radioactive waste resin. Therefore, the processing process is complicated, such as the temporary storage of the radioactive waste mixture, the separation process, and the complicated transfer line of the waste liquid, so that not only is the work productivity significantly reduced, but the facility cost is very high, and ^{the 14} _CO2- containing gas from the radioactive waste resin is There is also a problem that the rate of thermal reaction at which the gas separates is low.

The present invention has been made in consideration of the above-mentioned conventional problems, and its purpose is to directly extract only radioactive waste resin from a radioactive waste resin mixture storage tank of a nuclear power plant without a separation process for the radioactive waste resin mixture, and to greatly improve the heating reaction rate by heating the extracted radioactive waste resin in a vacuum state, and to capture ¹⁴ _CO2 gas from the ¹⁴ _CO2 -containing gas separated from the radioactive waste resin and store it in a liquefied ¹⁴ _CO2 gas state, thereby simplifying the process, significantly improving work productivity, greatly reducing the manufacturing cost of the system, and increasing the heating reaction rate, as well as to increase the captured ¹⁴ _CO2. The present invention provides a waste resin mixture treatment system for radioactive liquid waste decontamination _that enables recycling of ¹⁴ _CO2 gas by storing the gas as liquefied ¹⁴ CO2 gas without using an adsorbent to adsorb it, and does not generate secondary radioactive waste such as an adsorbent.

The purpose of the above invention is to provide a radioactive waste resin extraction device which is connected to a radioactive waste resin extraction pipe and an inlet pipe of a radioactive waste resin mixture storage tank of a nuclear power plant, respectively, and which sucks water containing radioactive waste resin through the radioactive waste resin extraction pipe, discharges water mixed with the radioactive waste resin through the inlet pipe into the radioactive waste resin mixture storage tank, temporarily stores the radioactive waste resin, and supplies the temporarily stored radioactive waste resin when necessary; a radioactive waste resin inlet, a waste resin outlet. A radioactive waste resin heating reactor having an air exhaust port, ^{a 14} _CO2- containing gas exhaust port, a blower and conveying unit, and a heating means, and having a hollow interior, the reactor receives radioactive waste resin from the radioactive waste resin extraction device, heats the radioactive waste resin by the heating means to separate ¹⁴ _{CO2 -} containing gas from the radioactive waste resin, exhausts the separated ¹⁴ CO2-containing gas through the ¹⁴ _CO2 -containing gas exhaust port, and the waste resin from which ^{the 14} _CO2 -containing gas is separated by the heating reaction is dried by the blower unit and simultaneously transported to the waste resin discharge port by the transporting unit for discharge; ^A vessel having an inlet for introducing ¹⁴ CO ₂ containing gas delivered through an exhaust port of a radioactive waste resin heating reactor, an exhaust port for exhausting ¹⁴ CO ₂ gas from which moisture and dust have been removed, and a drain port _for draining condensate, wherein the condensate is stored inside, and a gas-water separation device which separates moisture and dust from the ¹⁴ CO ₂ containing gas flowing into the interior through the inlet port and exhausts ^{the 14} CO ₂ gas from which moisture and dust have been separated through the exhaust port in a manner that the inlet port is connected to ^{the 14} CO ₂ containing gas exhaust port of the radioactive waste resin heating reactor through a connection pipe; a liquefied gas storage device which is connected to the exhaust port of the gas-water separation device through a connection pipe and liquefies and stores ¹⁴ CO ₂ gas from which moisture and dust have been removed, which flows in through the exhaust port of the gas-water separation device; A vacuum pump means which is connected in communication with the air exhaust port of the radioactive waste resin heating reactor and sucks in internal air so that the inside of the radioactive waste resin heating reactor becomes a preset pressure state; A ^{14 CO 2 detection means which is mounted on the 14} CO ₂ containing gas exhaust port of the radioactive waste resin heating reactor and detects ¹⁴ CO ₂ and transmits a detection signal; First ^{to fourth} _{electromagnetic} valves which are respectively mounted on the radioactive waste resin inlet, the waste resin outlet, the vacuum exhaust port, and the gas exhaust port of the radioactive waste resin heating reactor and open and close the radioactive waste resin inlet, the waste resin outlet, the vacuum exhaust port, and the gas exhaust port, respectively; The present invention can be achieved by a waste resin mixture treatment system for decontamination of radioactive liquid waste, characterized in that it comprises a control unit which is respectively connected to the radioactive waste resin extraction device, the radioactive waste resin heating reactor, the liquefied gas storage device, the vacuum pump means, the ¹⁴ _CO2 detection means, and the first to fourth electronic valves, and which controls the operation of the radioactive waste resin extraction device, the radioactive waste resin heating reactor, the liquefied gas storage device, the vacuum pump means, and the first to fourth electronic valves; and a control panel which has a display unit which displays information and images, and a command input unit which inputs control commands, and which is connected to the control unit and which displays various types of information and images received from the control unit on the display unit, and at the same time inputs control commands input by an operator through the command input unit into the control unit.

The system for processing a waste resin mixture for decontamination of radioactive liquid waste according to the present invention uses a single separation tank to easily separate radioactive waste resin and waste mixture from a radioactive waste resin mixture generated from a nuclear power plant, and applies a heating lamp and drying drum method to desorb radioactive nuclides from the separated radioactive waste resin, and recovers and processes the desorbed radionuclides, while greatly improving the heating reaction rate without the risk of explosion or fire, and reducing waste resin carbonization and dust generation. In addition, the system is manufactured with a movable volume so that waste resin separation and radionuclide desorption treatment for a radioactive waste resin mixture can be quickly performed on-site.

Figure 1 is a drawing showing the overall configuration of the separation and treatment device of the waste resin mixture treatment system for radioactive liquid waste decontamination according to the present invention.
FIG. 2 is a cross-sectional drawing of a radioactive waste resin extraction device in the waste resin mixture treatment system for radioactive liquid waste decontamination according to the present invention illustrated in FIG. 1.
Figure 3 is a cross-sectional drawing of a radioactive waste resin heating reactor in a waste resin mixture treatment system for radioactive liquid waste decontamination according to the present invention.
Figure 4 is a drawing schematically illustrating the configuration of a liquefied gas storage device in a waste resin mixture treatment system for radioactive liquid waste decontamination according to the present invention.
Figure 5 is a drawing schematically illustrating the configuration of a water separation device in a waste resin mixture treatment system for radioactive liquid waste decontamination according to the present invention.
FIG. 6 is a block diagram illustrating components connected to a control unit among the components of a waste resin mixture treatment system for radioactive liquid waste decontamination according to the present invention and the organic relationship between the components.

The advantages and features of the present invention, and the methods for achieving them, will become clear with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and the embodiments are provided only to make the disclosure of the present invention complete and to fully inform a person having ordinary skill in the art to which the present invention pertains of the invention and its scope, and are limited by the claims of the present invention.

In describing embodiments of the present invention, if it is judged that a detailed description of a function or configuration that is already known may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. In addition, the terms described below are terms defined in consideration of functions in embodiments of the present invention, and these may vary depending on the intention or custom of the user or operator. Therefore, the definitions should be made based on the contents throughout this specification.

Hereinafter, with reference to the attached drawings, FIGS. 1 to 6, a preferred embodiment of a waste resin mixture treatment system for decontamination of radioactive liquid waste according to the present invention will be specifically described.

Referring to the attached drawings 1 to 6, the waste resin mixture treatment system (10) for radioactive liquid waste decontamination according to the present invention is composed of a radioactive waste resin extraction device (20), a radioactive waste resin heating reactor (30), a gas separation device (40), a liquefied gas storage device (50), a vacuum pump means (60), ^{a 14} CO ₂ detection means (70), first to fourth solenoid valves (80), (81), (82), and (83), a control unit (90), and a control panel (100).

The above-mentioned radioactive waste resin extraction device (20) is connected to the radioactive waste resin extraction pipe and intake pipe of the radioactive waste resin mixture storage tank (200) of the nuclear power plant, sucks water containing radioactive waste resin through the radioactive waste resin extraction pipe, discharges water mixed with the radioactive waste resin through the intake pipe into the radioactive waste resin mixture storage tank (200), temporarily stores the radioactive waste resin, and supplies the temporarily stored radioactive waste resin when necessary. It is composed of a extraction pipe (21), fifth and sixth solenoid valves (84)(85), and a pump means (22).

The above-mentioned extraction tube (21) has a hollow interior and is a cylindrical shape with a funnel-shaped lower portion, and is equipped with an absorption port (21a), a radioactive waste resin discharge port (21b), and a discharge port (21c).

The above absorption port (21a) is formed to protrude upwardly in the center of the upper surface of the inlet/outlet tube (21) so as to be connected to the radioactive waste resin discharge pipe of the radioactive waste resin mixture storage tank (200) of the nuclear power plant, and absorbs water including radioactive waste resin through the radioactive waste resin discharge pipe of the radioactive waste resin mixture storage tank (200).

The above radioactive waste resin discharge port (21b) is a pipe having a perforated band formed by perforating a plurality of sieving holes at regular intervals, and is formed to protrude downward from the lower center of the outlet tube (21) so as to be connected to the radioactive waste resin inlet of the radioactive waste resin heating reactor (30), temporarily stores radioactive waste resin introduced into the internal hollow space, and supplies it into the radioactive waste resin heating reactor (30) through the radioactive waste resin inlet of the radioactive waste resin heating reactor (30) when necessary.

The above discharge port (21c) is formed so as to surround the outer surface of the perforated belt of the above radioactive waste resin discharge port (21b) and branched, and the other end is connected to the inlet pipe of the radioactive waste resin mixture storage tank (200) of the nuclear power plant through a connecting pipe, and water that has flowed into the inside through the above absorption port (21a) is discharged into the radioactive waste resin mixture storage tank (200) through the inlet pipe of the radioactive waste resin mixture storage tank (200).

The fifth and sixth electronic switches (84)(85) are respectively mounted on the absorption port (21a) and the discharge port (21c) of the outlet tube (21) so as to be connected to the control unit (90), and open and close the absorption port (21a) and the discharge port (21c) respectively according to the control of the control unit (90).

The above pump means (22) is mounted on the discharge port (21c) of the discharge tube (21) so as to be connected to the control unit (90), and pumps water according to the control of the control unit (90) to absorb water including radioactive waste resin through the radioactive waste resin discharge tube of the radioactive waste resin mixture storage tank (200), discharges the water flowing into the inside into the radioactive waste resin mixture storage tank (200) through the inlet tube of the radioactive waste resin mixture storage tank (200), and discharges the radioactive waste resin in the radioactive waste resin mixture storage tank (200) together with water into the discharge tube (21).

The above radioactive waste resin heating reactor (30) has a radioactive waste resin inlet and a waste resin outlet. A cylindrical device having an air exhaust port, ^{a 14} _CO2- containing gas exhaust port, a blower and transport unit, and a heating means, and having an internal hollow space, wherein radioactive waste resin is supplied from the radioactive waste resin extraction device (20), the radioactive waste resin is heated by the heating means to separate ¹⁴ _CO2 -containing gas from the radioactive waste resin, the separated ¹⁴ _CO2 -containing gas is exhausted through the ¹⁴ _CO2- containing gas exhaust port, and the waste resin from which ^{the 14} _CO2 -containing gas is separated by the heating reaction is dried by the blower unit and simultaneously transported to the waste resin discharge port by the transport unit for discharge, and is composed of a housing (31), a blower unit (32), a transport unit (33), a plurality of camera means (34), a temperature sensing means (35), a pressure sensing means (36), and a plurality of magnetron oscillators (37).

The above housing (31) has an inner hollow space, is in a long, lying-down cylindrical shape, and is equipped with a radioactive waste resin inlet (31a), a waste resin outlet (31b), an air exhaust port (31c), ^{a 14} CO ₂ containing gas exhaust port (31d), and an observation window (31e).

The above-mentioned radioactive waste resin inlet (31a) is formed by protruding on the upper outer surface of one end of the housing (31) so that radioactive waste resin withdrawn from the radioactive waste resin mixture storage tank (200) by the radioactive waste resin extraction device (20) flows into the inner hollow space through the radioactive waste resin discharge device (21b) of the radioactive waste resin extraction device (20) and is connected to the radioactive waste resin discharge device (21b).

The above waste resin discharge port (31b) is formed by protruding on the lower outer surface of the other end of the housing (31), and discharges the waste resin to the outside by separating and removing the gas containing ¹⁴ CO ₂ through a heating reaction within the internal hollow space.

The above air exhaust port (31c) is formed protrudingly on the upper outer surface of the housing (31) and exhausts internal air to the outside so that the internal cavity is at a preset pressure.

The above ¹⁴ CO ₂ containing gas exhaust port (31d) is formed protruding on the upper outer surface and discharges ¹⁴ CO ₂ containing gas separated from the radioactive waste in the inner hollow space.

The above observation window (31e) is formed along the longitudinal direction on the outer surface so that the internal hollow space can be observed from the outside of the housing (31).

The above blower unit (32) blows ^{the 14} CO ₂ containing gas while drying the waste resin in which ^{the 14} CO ₂ containing gas is evaporated and removed by a heating reaction within the housing (31), and is composed of a fan shaft (32a) and a fan shaft driving means (32b).

The above fan shaft (32a) is a shaft on which a number of fans are mounted at regular intervals, and is rotatably built between both end faces on the upper side of the inner hollow of the housing (31).

The above fan shaft driving means (32b) is a motor and is mounted on the outside of the housing (31) so as to be connected to the fan shaft (32a) so as to be connected to the control unit (90) and drives the fan shaft (32a) according to the control of the control unit (90).

The above-mentioned transport unit (33) is for stirring and transporting the radioactive waste resin introduced into the housing (31), and is composed of a transport screw shaft (33a) and a transport screw shaft driving means (33b).

The above-mentioned transfer screw shaft (33a) is rotatably built between the two end faces on the lower side within the inner hollow space of the housing (31).

The above-mentioned transfer screw shaft driving means (33) is a motor, and is mounted on the outside of the housing (31) so as to be connected to the transfer screw shaft (33a) so as to be connected to the control unit (90) and drive the transfer screw shaft (33a) according to the control of the control unit (90).

The above-mentioned plurality of camera means (34) are camera modules, and are mounted on the outer surface of the observation window (31e) of the housing (31) so as to be connected to the control unit (90), photograph the interior of the housing (31) through the observation window (31e), and transmit the acquired image to the control unit (90).

The above temperature detection means (35) is mounted within the housing (31) so as to be connected to the control unit (90), detects the temperature within the housing (31), and transmits the detection signal to the control unit (90).

The above pressure detection means (36) is mounted within the housing (31) so as to be connected to the control unit (90), detects the pressure within the housing (31), and transmits the detection signal to the control unit (90).

The above-mentioned plurality of magnetron oscillators (37) are electromagnetic wave oscillators that oscillate electromagnetic waves and are built into the inside of the housing (31) so as to be connected to the control unit (90), and generate electromagnetic waves according to the control of the control unit (90) to heat the radioactive waste resin inside the housing (31) and evaporate and separate the gas containing ¹⁴ CO ₂ contained in the radioactive waste resin.

The above-mentioned gas separation device (40) removes moisture and dust contained in ^{the 14} CO ₂ containing gas exhausted from the radioactive waste resin heating reactor (30), and is a vessel having an inlet (41) into which ¹⁴ CO ₂ containing gas, which is transported through the ¹⁴ CO ₂ containing gas exhaust port of the radioactive waste resin heating reactor (30), an exhaust port (42) for exhausting ¹⁴ CO ₂ gas from which moisture and dust have been removed, and a drain port (43) for draining condensate, wherein condensate is stored inside, moisture and dust are separated from ¹⁴ CO ₂ containing gas flowing into the interior through the inlet (41), and ^{the 14} CO ₂ gas from which moisture and dust have been separated is exhausted through the exhaust port ( ⁴² ). _2. It is connected to the exhaust port (31d) and the connecting pipe.

The above liquefied gas storage device (50) is connected to the exhaust port of the above gas separation device (40) through a connecting pipe, and liquefies ¹⁴ CO ₂ gas from which moisture and dust have been removed, flowing in from the exhaust port of the above gas separation device (40), and stores the ¹⁴ CO ₂ gas in a liquefied state. It is composed of a liquid nitrogen tank (51), ^{a 14} CO ₂ gas storage container (52), and a compression means (53).

The above liquid nitrogen tank (51) is a cylindrical tank with an open top, and liquid nitrogen for cooling ¹⁴ CO ₂ gas to an extremely low temperature is stored inside.

The above ¹⁴ CO ₂ gas storage tank (52) is a gas storage tank equipped with a gas control unit at the top and having a gas inlet and outlet through which gas is introduced and discharged by the gas control unit, and is vertically assembled through the opening of the liquid nitrogen tank (51) and immersed in liquid nitrogen.

The above compression means (53) is a compressor that pressurizes gas, and the gas inlet is connected to the exhaust port of the gas separation device (40) through a connection pipe, and the gas outlet is connected to the gas control unit of the ¹⁴ CO ₂ gas storage container (52) through a connection pipe, and compresses the ¹⁴ CO ₂ gas from which moisture and dust have been removed, transferred from the gas separation device (40), and transfers it to the ¹⁴ CO ₂ gas storage container (52). The compressed 14 CO ₂ gas that has been introduced into the ¹⁴ CO ₂ gas storage container (52) through the compression means ( ⁵³ ) is cooled to an extremely low temperature by liquid nitrogen and stored in the ¹⁴ CO ₂ gas storage container (52) in a liquefied ¹⁴ CO ₂ gas state.

The above vacuum pump means (60) is connected to the air exhaust port of the radioactive waste resin heating reactor (30) and sucks in internal air so that the inside of the radioactive waste resin heating reactor (30) becomes a preset pressure state and discharges it to the outside.

The above ¹⁴ CO ₂ detection means (70) is mounted on the ¹⁴ CO ₂ containing gas exhaust port of the radioactive waste resin heating reactor (30) so as to be connected to the control unit (90), detects ¹⁴ CO ₂ gas, and transmits the detection signal to the control unit (90).

The first to fourth electronic switches (80), (81), (82), and (83) are respectively mounted on the radioactive waste resin inlet, waste resin outlet, air exhaust port, and gas exhaust port of the radioactive waste resin heating reactor (30) so as to be connected to the control unit (90), and open and close the radioactive waste resin inlet, waste resin outlet, vacuum exhaust port, and gas exhaust port, respectively, according to the control of the control unit (90).

The above control unit (90) is connected to the pump means (22) of the radioactive waste resin extraction device (20), the fifth and sixth electronic valves (84)(85) of the radioactive waste resin extraction device (20), the multiple camera means (34) of the radioactive waste resin heating reactor (30), the temperature detection means (35) of the radioactive waste resin heating reactor (30), the pressure detection means (36) of the radioactive waste resin heating reactor (30), the multiple magnetron generators (37) of the radioactive waste resin heating reactor (30), the compression means (53) of the liquefied gas storage device (50), the vacuum pump means (60), ^{the 14} CO ₂ detection means (70), the first to fourth electronic valves (80)(81)(82)(83) and the seventh electronic valve (86), respectively, and the radioactive waste resin extraction device (20), the radioactive waste resin heating reactor (30), the The operation of the reactor (30), the compression means (53) of the liquefied gas storage device (50), the vacuum pump means (60), and the first to seventh solenoid valves (80)(81)(82)(83)(84)(85)(86) is controlled.

The above control panel (100) is equipped with a display section for displaying information and images, and a command input section for inputting control commands, and is connected to the control section (90). Various information and images received from the control section (90) are displayed on the display section, and control commands input by an operator through the command input section are input into the control section (90).

The system for processing waste resin mixture for decontamination of radioactive liquid waste according to the present invention having the above configuration opens the fifth electronic valve (84) of the radioactive waste resin withdrawal device (20), closes the sixth electronic valve (85), and operates the pump means (22), so that among the radioactive waste resin mixture stored in the radioactive mixture storage tank (200) while being submerged in water, radioactive waste resin having a specific gravity lower than activated carbon and zeolite flows into the withdrawal tank (21) of the radioactive waste resin withdrawal device (20) through the radioactive waste resin withdrawal pipe and absorption port (21a) of the radioactive waste resin mixture storage tank (200) together with water, and when the fifth electronic valve (84) is closed while the pump means (22) is in operation, the inflow of water including radioactive waste resin into the withdrawal tank (21) is stopped, and at the same time, the water in the withdrawal tank (21) flows out through the discharge port (21c) along with the radioactive waste resin mixture. As it is returned to the storage tank (200), only the radioactive resin remains in the discharge container (21). When the drainage in the discharge container (21) of the radioactive waste resin discharge device (20) is completed as described above, the operation of the pump means (22) is temporarily stopped, the sixth solenoid valve (85) is opened, the second solenoid valve (81) is closed, and at the same time, the transfer screw shaft driving means (33b) of the radioactive waste resin heating reactor (30) is operated to supply the radioactive resin in the discharge container (21) into the housing (31) of the radioactive waste resin heating reactor (30) and at the same time, transfer the radioactive waste resin introduced into the housing (31) so as to be evenly arranged within the housing (31).

If the supply of radioactive waste resin to the radioactive waste resin heating reactor (30) as described above is completed, the first and fourth solenoid valves (80)(83) are closed, and the vacuum pump means (60) is operated until the pressure inside the housing (31) reaches a preset pressure state to discharge the air inside the housing (31) of the radioactive waste resin heating reactor (30), and if the pressure inside the housing (31) reaches the preset pressure state, the third solenoid valve (82) is closed while simultaneously stopping the operation of the vacuum pump means (60), and while operating the plurality of magnetron generators (37), a heating reaction for the radioactive waste resin inside the housing (31) is performed, and at the same time, the transfer screw shaft drive means (33b) of the transfer unit (33) is operated in reverse to stir the radioactive waste resin inside the housing (31) and promote the heating reaction for the radioactive waste resin. At this time, the temperature inside the housing (31) is maintained at a preset temperature.

If the heating reaction for the radioactive waste resin is maintained for a preset period of time as described above, the third electronic valve (83) is opened while the heating reaction is in progress, the fan shaft driving means (32b) of the blower unit (32) is operated, and at the same time, the compression means (53) of the liquefied gas storage device (50) is operated so that ^{the 14} CO ₂ -containing gas in the housing (31) separated from the radioactive waste resin by the heating reaction is exhausted through ^{the 14} CO ₂ -containing gas exhaust port (31d), and ^{the 14} CO ₂ -containing gas exhausted from the housing (31) is purified into ¹⁴ CO ₂ gas by removing moisture and dust while passing through the gas separation device (40), and this ¹⁴ CO ₂ gas is compressed to high pressure by the compression means (53) of the liquefied gas storage device (50) and introduced into the ¹⁴ CO ₂ gas storage container (52) and discharged into the ¹⁴ CO ₂ gas storage container (52). The introduced high-pressure compressed ¹⁴ CO ₂ gas is cooled to an extremely low temperature by liquid nitrogen and stored as liquefied ¹⁴ CO ₂ gas in a ¹⁴ CO ₂ gas storage tank (52).

The heating reaction for radioactive waste resin in the housing (31) and the storage process of liquefied ¹⁴ CO ₂ gas are continued until ^{a 14} CO ₂ detection signal is not received from the ¹⁴ CO ₂ detection means (70), and if ^{a 14} CO ₂ detection signal is not received from the ¹⁴ CO ₂ detection means (70), the operation of the compression means (53) is stopped, the second solenoid valve (81) is opened to open the waste resin discharge port (31b) of the housing (31), and the transport screw shaft driving means (33b) of the transport unit (33) is driven in the discharge direction to discharge the waste resin in the housing (31) to the outside of the housing (31) through the waste resin discharge port (31b), and if the discharge of the waste resin is completed, the second to fourth solenoid valves (81), (82), and (83) are closed, and the fan driving means (32b), the transport screw shaft By sequentially repeating the above process in such a way that the system is initialized by stopping the operation of the driving means (33b) and the plurality of magnetron generators (37), and then the radioactive waste resin extraction device (20) is operated to extract the radioactive waste resin in the radioactive waste resin mixture storage tank (200), ^{the 14} CO ₂ containing gas can be separated from the radioactive waste resin, the ¹⁴ CO ₂ gas can be purified from the separated ¹⁴ CO ₂ containing gas, and the purified ¹⁴ CO ₂ gas can be stored as liquefied ¹⁴ CO ₂ gas.

The waste resin mixture treatment system for radioactive liquid waste decontamination according to the present invention directly extracts only radioactive waste resin from the radioactive waste resin mixture storage tank of a nuclear power plant, and greatly improves the heating reaction rate by heating the extracted radioactive waste resin in a vacuum state, and can capture ¹⁴ _CO2 gas from the ¹⁴ _CO2- containing gas separated from the radioactive waste resin and store it in a liquefied ¹⁴ _CO2 gas state, so that secondary radioactive waste such as a ¹⁴ _CO2 gas adsorbent is not generated, and since the process is simple, work productivity is significantly improved while facility costs are reduced, and the heating reaction rate is increased, and the captured ¹⁴ _CO2 gas can be stored as liquefied ¹⁴ _CO2 gas, so that ^{the 14} _CO2 gas can be recycled.

In this way, it will be understood by those skilled in the art that the technical configuration of the present invention described above can be implemented in other specific forms without changing the technical idea or essential features of the present invention.

Therefore, the embodiments described above should be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

10: Waste resin mixture treatment system for radioactive liquid waste decontamination
20: Radioactive waste water extraction device 22: Pump means
30: Radioactive waste resin heating reactor 32: Blower unit
33: Transport unit 34: Camera means
35: Temperature sensing means 36: Pressure sensing means
37: Magnetron Oscillator
40: Gas separation device 50: Liquefied gas storage device
51: Liquid nitrogen tank 52: ¹⁴ _CO2 gas storage tank
53: Compression means 60: Ratio separator
70: ¹⁴ CO ₂ detection means 80 ~ 86: 1st to 6th electron switches
90: Control unit 100: Control panel
200: Radioactive waste resin mixture storage tank

Claims (5)

A radioactive waste resin extraction device (20) which is connected to the radioactive waste resin discharge pipe and inlet pipe of a radioactive waste resin mixture storage tank (200) of a nuclear power plant, sucks water containing radioactive waste resin through the radioactive waste resin discharge pipe, discharges water mixed with radioactive waste resin through the inlet pipe into the radioactive waste resin mixture storage tank (200), temporarily stores radioactive waste resin, and supplies the temporarily stored radioactive waste resin; a radioactive waste resin inlet, a waste resin outlet. A radioactive waste resin heating reactor (30) having an air exhaust port, a ¹⁴ _CO2- containing gas exhaust port, a blower and transport unit, and a heating means, and having a hollow interior, and which receives radioactive waste resin from the radioactive waste resin extraction device (20), heats the radioactive waste resin by the heating means to separate ¹⁴ _CO2 -containing gas from the radioactive waste resin, exhausts the separated ¹⁴ _CO2 -containing gas through the ¹⁴ _CO2 -containing gas exhaust port, and the waste resin from which ^{the 14} _CO2 -containing gas is separated by the heating reaction is dried by the blower unit and simultaneously transported to the waste resin discharge port by the transport unit for discharge; A tank having an inlet (41) for introducing ¹⁴ CO ₂ containing gas, which is transported through the ¹⁴ CO ₂ containing gas exhaust port (31d) of the radioactive waste resin heating reactor (30), an exhaust port (42) that is opened and closed by the seventh solenoid valve (86) and exhausts ¹⁴ CO ₂ gas from which moisture and dust have been removed, and a drain port for draining condensate, wherein the condensate is stored inside, moisture and dust are separated from ¹⁴ CO ₂ containing gas flowing into the inside through the inlet port (41), and the inlet port (41) is connected to the ¹⁴ CO ₂ containing gas exhaust port (31d) of the radioactive waste resin heating reactor (30) through a connecting pipe so as to exhaust _{the 14} ^CO 2 gas from which moisture and dust have been separated through the exhaust port (42); In a waste resin mixture treatment system for decontamination of radioactive liquid waste, the waste resin mixture treatment system comprises: a vacuum pump means (60) which is connected in communication with the air exhaust port of the radioactive waste resin heating reactor (30) and sucks in internal air so that the inside of the radioactive waste resin heating reactor (30) becomes a preset pressure state; and a ¹⁴ CO ₂ detection means (70) which is mounted on the ¹⁴ CO ₂ containing gas exhaust port of the radioactive waste resin heating reactor (30) and detects ¹⁴ CO ₂ and transmits a detection signal.
The above system,
A liquefied gas storage device (50) that is connected to the exhaust port of the above-mentioned water separator (40) through a connecting pipe and liquefies and stores ¹⁴ _CO2 gas from which moisture and dust are removed, flowing in from the exhaust port of the above-mentioned water separator (40);
The first to fourth solenoid valves (80)(81)(82)(83) are respectively mounted on the radioactive waste resin inlet, waste resin outlet, air exhaust port and gas exhaust port of the radioactive waste resin heating reactor (30) and open and close the radioactive waste resin inlet (31a), waste resin outlet (31b), air exhaust port (31c) and ¹⁴ CO ₂ containing gas exhaust port (31d),
A control unit (90) which is connected to the radioactive waste resin extraction device (20), the radioactive waste resin heating reactor (30), the liquefied gas storage device (50), the vacuum pump means (60), ^{the 14} CO ₂ detection means (70), and the first to fourth electronic switches (80)(81)(82)(83), respectively, and controls the operation of the radioactive waste resin extraction device (20), the radioactive waste resin heating reactor (30), the liquefied gas storage device (50), the vacuum pump means (60), the first to fourth electronic switches (80)(81)(82)(83), and the seventh electronic switch (86),
It further includes a control panel (100) having a display section for displaying information and images and a command input section for inputting control commands, and connected to the control section (90), and displaying various information and images received from the control section (90) on the display section while inputting control commands input by an operator through the command input section into the control section (90);
The above radioactive waste resin extraction device (20) is
A tube having a hollow interior and a funnel-shaped lower portion, and having an absorption port (21a) formed by protruding upwardly at the center of the upper surface so as to be connected in communication with a radioactive waste resin discharge pipe of a radioactive waste resin mixture storage tank (200) of a nuclear power plant, and absorbing water including radioactive waste resin through the radioactive waste resin discharge pipe of the radioactive waste resin mixture storage tank (200), and having a perforated band formed by perforating a plurality of sieving holes at a certain section, and having a radioactive waste resin discharge port (21b) formed by protruding downwardly at the center so as to be connected in communication with a radioactive waste resin inlet of a radioactive waste resin heating reactor (30), and temporarily storing radioactive waste resin introduced into the hollow interior and supplying it into the radioactive waste resin heating reactor (30) through the radioactive waste resin inlet of the radioactive waste resin heating reactor (30) when necessary, and one end of which is connected in communication with the A discharge tube (21) formed to surround the outer circumference of the perforated belt of the radioactive waste resin discharge port (21b) and branched, the other end being connected to the inlet pipe of the radioactive waste resin mixture storage tank (200) of the nuclear power plant through a connecting pipe, and having a discharge port (21c) for discharging water that has entered the inside through the absorption port (21a) into the radioactive waste resin mixture storage tank (200) through the inlet pipe of the radioactive waste resin mixture storage tank (200);
The fifth and sixth solenoid valves (84)(85) are respectively mounted on the absorption port (21a) and the discharge port (21c) of the extraction tube (21) so as to be connected to the control unit (90), and open and close the absorption port (21a) and the discharge port (21c) respectively according to the control of the control unit (90).
It is composed of a pump means (22) which is mounted on the discharge port (21c) of the discharge tube (21) so as to be connected to the control unit (90), and which pumps water according to the control of the control unit (90) to absorb water including radioactive waste resin through the radioactive waste resin discharge tube of the radioactive waste resin mixture storage tank (200), discharges the water introduced inside into the radioactive waste resin mixture storage tank (200) through the inlet tube of the radioactive waste resin mixture storage tank (200), and discharges the radioactive waste resin in the radioactive waste resin mixture storage tank (200) together with water into the discharge tube (21);
The above radioactive waste resin heating reactor (30) is
A long, cylindrical shape having an inner hollow space, and a radioactive waste resin inlet (31a) which is protruded on the upper outer surface at one end side and is connected to the radioactive waste resin outlet (21b) so that radioactive waste resin withdrawn from a radioactive waste resin mixture storage tank (200) by a radioactive waste resin extractor (20) flows into the inner hollow space through the radioactive waste resin outlet (21b) of the radioactive waste resin extractor (20), a waste resin outlet (31b) which is protruded on the lower outer surface at the other end side and discharges waste resin from which ¹⁴ CO ₂ -containing gas is separated and removed through a heating reaction within the inner hollow space to the outside, an air exhaust port (31c) which is protruded on the upper outer surface and discharges internal air to the outside so that the inner hollow space becomes a preset pressure state, and an air exhaust port (31c) which is protruded on the upper outer surface and discharges internal air to the outside so that the inner hollow space becomes a preset pressure state separated from the radioactive waste resin within the inner hollow space. A housing (31) having a ¹⁴ CO ₂ containing gas exhaust port (31d) for emitting a gas containing ¹⁴ CO ₂ and an observation window (31e) formed along the longitudinal direction on the outer surface so that the inner hollow can be observed from the outside,
A blowing unit (32) comprising a shaft on which a plurality of fans are mounted at regular intervals, a fan shaft (32a) rotatably built between both end faces on the upper side of the inner hollow of the housing (31), and a fan shaft driving means (32b) mounted on the outside of the housing (31) so as to be connected to the fan shaft (32a) and driving the fan shaft (32a) according to the control of the control unit (90),
A transfer unit (33) comprising a transfer screw shaft (33a) rotatably built between the two end faces in the lower part of the inner hollow of the housing (31), and a transfer screw shaft driving means (33b) mounted on the outside of the housing (31) so as to be connected to the transfer screw shaft (33a) and driving the transfer screw shaft (33a) according to the control of the control unit (90),
A plurality of camera means (34) mounted on the outer surface of the observation window (31e) of the housing (31) so as to be connected to the control unit (90), photographing the inside of the housing (31) through the observation window (31e) and transmitting the acquired image to the control unit (90),
A temperature detection means (35) mounted within the housing (31) to be connected to the control unit (90), detecting the temperature within the housing (31) and transmitting the detection signal to the control unit (90),
A pressure detection means (36) mounted within the housing (31) to be connected to the control unit (90), detecting the pressure within the housing (31) and transmitting the detection signal to the control unit (90),
It is composed of a plurality of magnetron oscillators (37) built into the inside of the housing (31) so as to be connected to the control unit (90), and which generate electromagnetic waves according to the control of the control unit (90) to heat the radioactive waste resin inside the housing (31) and evaporate and separate the gas containing ¹⁴ CO ₂ contained in the radioactive waste resin;
The above liquefied gas storage device (50) is
A liquid nitrogen tank (51) which is a cylindrical tank with an open top and in which liquid nitrogen is stored inside,
A gas storage container having a gas control unit mounted on the top and a gas inlet and outlet for introducing and discharging gas by the gas control unit, and ^{a 14} CO ₂ gas storage container (52) that is vertically assembled through the opening of the liquid nitrogen tank (51) and immersed in liquid nitrogen,
The gas inlet is connected to the exhaust port of the gas separation device through a connecting pipe, the gas outlet is connected to the gas control unit of the ¹⁴ CO ₂ gas storage container (52) through a connecting pipe, and a compression means (53) is configured to compress ^{the 14} CO ₂ gas from which moisture and dust have been removed and transfer it from the gas separation device (40) and transfer it to the ¹⁴ CO ₂ gas storage container (52), and the compressed ¹⁴ CO ₂ gas that has been introduced into the ¹⁴ CO ₂ gas storage container (52) through the compression means is cooled to an extremely low temperature by liquid nitrogen and stored in the ¹⁴ CO ₂ gas storage container (52) in a liquefied ¹⁴ CO ₂ gas state;
The above control unit (90)
When the pump means (22) is operated while the fifth electronic valve (84) of the radioactive waste resin extraction device (20) is opened and the sixth electronic valve (85) is closed, the radioactive waste resin having a lower specific gravity than activated carbon and zeolite among the radioactive waste resin mixture stored in the radioactive mixture storage tank (200) submerged in water is introduced into the extraction tank (21) of the radioactive waste resin extraction device (20) through the radioactive waste resin extraction pipe and absorption port (21a) of the radioactive waste resin mixture storage tank (200) together with water, and when the fifth electronic valve (84) is closed while the pump means (22) is operated, the introduction of water including radioactive waste resin into the extraction tank (21) is stopped and at the same time, the water in the extraction tank (21) is returned to the radioactive waste resin mixture storage tank (200) through the discharge port (21c), so that the radioactive waste resin is contained in the extraction tank (21). A radioactive waste resin extraction step that leaves only the resin,
After the above radioactive waste resin withdrawal step is completed, the operation of the pump means (22) is temporarily stopped, the sixth solenoid valve (85) is opened, the second solenoid valve (81) is closed, and at the same time, the transfer screw shaft driving means (33b) of the radioactive waste resin heating reactor (30) is operated to supply the radioactive resin in the withdrawal tank (21) into the housing (31) of the radioactive waste resin heating reactor (30) and at the same time, the radioactive waste resin introduced into the housing (31) is transferred so as to be evenly arranged within the housing (31).
If the above radioactive waste resin supply step is completed, the first and fourth electronic switches (80)(83) are closed, and the vacuum pump means (60) is operated until the pressure inside the housing (31) reaches a preset pressure state to discharge the air inside the housing (31) of the radioactive waste resin heating reactor (30), and if the pressure inside the housing (31) reaches the preset pressure state, the third electronic switch (82) is closed while simultaneously stopping the operation of the vacuum pump means (60), and a plurality of magnetron generators (37) are operated while performing a heating reaction on the radioactive waste resin inside the housing (31), and at the same time, the transfer screw shaft drive means (33b) of the transfer unit (33) is operated in reverse to stir the radioactive waste resin inside the housing (31) and promote the heating reaction on the radioactive waste resin. At this time, the temperature inside the housing (31) is maintained at a preset temperature, and the radioactive waste resin heating reaction step,
If the above radioactive waste resin heating reaction step is maintained for a preset period of time, the third electronic valve (83) is opened while the heating reaction is in progress, the fan shaft driving means (32b) of the blower unit (32) is operated, and at the same time, the compression means (53) of the liquefied gas storage device (50) is operated so that ^{the 14} CO ₂ containing gas in the housing (31) separated from the radioactive waste resin by the heating reaction is exhausted through ^{the 14} CO ₂ containing gas exhaust port (31d), and ^{the 14} CO ₂ containing gas exhausted from the housing (31) is purified into ¹⁴ CO ₂ gas by removing moisture and dust while passing through the gas separation device (40), and this ¹⁴ CO ₂ gas is compressed to high pressure by the compression means (53) of the liquefied gas storage device (50) and introduced into the ¹⁴ CO ₂ gas storage container (52), and the gas introduced into the ¹⁴ CO ₂ gas storage container (52) is A liquefied ¹⁴ CO ₂ gas storage step in which the high-pressure compressed ¹⁴ CO ₂ gas is cooled to an extremely low temperature by liquid nitrogen and stored as liquefied ¹⁴ CO ₂ gas in a ¹⁴ CO ₂ gas storage container (52), and when the ¹⁴ CO ₂ detection signal is not received from ^{the 14 CO} ₂ detection means (70), the operation of the compression means (53) is stopped if the 14 CO ₂ detection signal is not received from the ¹⁴ CO ₂ detection means (70).
A waste resin mixture treatment system for decontamination of radioactive liquid waste, characterized in that if the above liquefied ¹⁴ CO ₂ gas storage step is completed, the second solenoid valve (81) is opened to open the waste resin discharge port (31b) of the housing (31), and the transport screw shaft driving means (33b) of the transport unit (33) is driven in the discharge direction to discharge the waste resin inside the housing (31) to the outside of the housing (31) through the waste resin discharge port (31b), sequentially and repeatedly executing the waste resin discharge step.

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