JPH1089481A - Construction method of container lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely seal, block up and join a cover by performing TIG welding on a thin plate on the same plane as an opening end surface to the inside of the opening end of a vessel, performing seal welding on a periphery of its mating face by arranging the cover on an end surface of the vessel and an outside surface of the thin plate in the next place, and performing HIP joining on the cover to the end surface of the vessel and the outside surface of the thin plate thereafter. SOLUTION: An austenite type stainless steel thin plate 10 is joined (a) by TIG welding 11 on the same plane as an opening end surface 4 of a vessel 1 to the inside of a cooling water header 2 on the opening end of the austenite type stainless steel bracket vessel 1 whose inside is partitioned into two chambers by a rib 7. Next, a cover 6 of a thick plate being a strength member is arranged on an end surface 4 of the vessel 1 and an outside surface of a thin plate 10, and seal welding 12 is performed (b) on a periphery of its mating face. Afterwards, the cover 6 is joined by HIP joining 13 to the opening end surface 4 of the bracket vessel 1 and the outside surface of the thin plate 10. A hole 14 is worked (c) so that hydrostatic pressure can be pressurized even from the inside of the cooling water header 2 at HIP joining time and a cooling water passage can be communicated with outside air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for mounting a container lid, and more particularly to a method suitable for mounting a lid on a first wall / blanket container of a fusion reactor.

[0002]

2. Description of the Related Art The first wall / blanket of a nuclear fusion reactor is required to be high in function and strength because it is used in a severe nuclear, thermal and electromagnetic environment. Since the first wall / blanket faces the plasma and is exposed to severe heat and particle loads from the plasma, the cooling passages are densely arranged in the first wall 20 as shown in FIG. Further, a space constituting a breeding area or a shielding area 21 is provided behind the first wall 20. The space constituting the breeding area or the shielding area 21 is a blanket container, and a lid 22 is attached to each of the cooling water headers at the open ends of the blanket container.

Conventionally, to attach a lid to the cooling water header at the open end of the blanket container, a thick lid 3 is placed inside the cooling water header 2 at the open end of the blanket container 1 as shown in FIG. Although they were attached by TIG welding 5 so as to be one, the deformation during welding was large, and there was a risk of high-temperature welding cracking when the restraint was strengthened to suppress the deformation.

In addition, in order to attach a lid to the cooling water header at the open end of the blanket container while preventing welding cracks, a lid 6 is attached to the open end surface 4 of the blanket container 1 by HIP (hot static) as shown in FIG. Although it is conceivable to perform the joining by water pressure, as shown in FIG. 5, an excessive pressure (for example, 150 MPa) at the time of the HIP joining may cause deformation of the lid 6 and the rib 7 in the cooling water header 2 as indicated by a dotted line. There is. In addition, even if seal welding 9 can be applied to the outer peripheral surface of the joining portion 8 before the HIP joining, it is difficult to apply the seal welding 9 to the periphery of the cooling water header 2 at the inner open end. If 9 is incomplete, the lid 6 cannot be HIP-bonded to the blanket container 1, but rather the lid 6 may peel off due to hydrostatic pressure during HIP bonding as shown in FIG.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a method for constructing a container lid capable of completely closing and joining the lid to the container when attaching the lid to various containers such as a blanket container. What you want to do.

[0006]

In order to solve the above-mentioned problems, a method for mounting a container lid according to the present invention is to provide a method for sealing a lid to a container, wherein a thin plate is provided inside the opening end of the container with the opening end face. First, TIG welding is performed, then a lid is installed on the end surface of the container and the outer surface of the thin plate, and the periphery of the mating surface is seal-welded, and then the lid is HIP-bonded to the end surface of the container and the outer surface of the thin plate. It is assumed that.

[0007] In the above method for constructing a container lid according to the present invention,
The container may be a container partitioned inside by a plurality of ribs, or may be a first wall / blanket container of a fusion reactor.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for constructing a container lid according to the present invention will be described with reference to the drawings. As shown in FIG. 1A, a blanket made of austenitic stainless steel partitioned into two chambers by a rib 7 as shown in FIG. Inside the cooling water header 2 at the opening end of the container 1, a thin plate 10 made of austenitic stainless steel is joined to the opening end surface 4 of the blanket container 1 by TIG welding 11 and then the end surface 4 of the blanket container 1 As shown in FIG. 1B, a thick plate lid 6 which is a strength member made of austenitic stainless steel is installed on the outer surface of the thin plate 10 and a seal welding 12 is formed around the mating surface.
And then the bracket container 1 as shown in FIG.
The lid 6 is HIP-joined 1 to the opening end face 4 of the
3 were joined. Further, the hole 14 is processed so that the cooling flow path communicates with the outside air so that the hydrostatic pressure can be increased from inside the cooling water header 2 at the time of the HIP joining.

In the method for mounting a container lid according to the present invention, FIG.
As shown in (a), the thin plate 10 was previously joined flush with the opening end surface 4 of the blanket container 1 to the inside of the cooling water header 2 at the open end of the blanket container 1 by TIG welding 11, but the thin plate 10 was not deformed. No high-temperature welding cracks occurred. Then, as shown in FIG. 1B, a thick plate lid 6 as a strength member is installed on the end surface 4 of the blanket container 1 and the outer surface of the thin plate 10, and a seal welding 12 is provided around the mating surface.
Then, as shown in FIG. 1C, when the lid 6 is bonded by the HIP bonding 13, the lid 6 is completely bonded, the blanket container 1 is completely closed, and the blanket container 1 is closed from inside and outside. Even when a high pressure was applied, the lid 6 did not peel off. This is because the pressure load at the time of the HIP joining effectively acts on the joining surface, the deformation at the time of the construction is minimized, and a sufficient joining strength is obtained. In addition, thin plate 10
Is completely penetration welded, so that the soundness of the seal as the coolant boundary is ensured.

Although the above embodiment is a construction method in which the lid 6 is attached to the blanket container 1, the container is not limited to the blanket container 1, and the present invention is applicable to chemical plants, energy plants, environmental plants, ships, The present invention can also be applied to a case where a lid is attached to a container in a large transport device such as an aircraft.

[0011]

As can be seen from the above description, according to the container lid construction method of the present invention, the container can be used in various plants and large-sized transport equipment including the first wall and blanket container of a fusion reactor. When attaching the lid, the thick plate lid, which is a strength member, can be easily and completely sealed to the container with sufficient bonding strength, so that the container is completely closed and pressure is applied from inside and outside of the container. Even then, the lid will not come off.

[Brief description of the drawings]

FIG. 1 shows a method for constructing a container lid according to the present invention, wherein a to
c is the process diagram.

FIG. 2 is a bird's-eye view showing a first wall / blanket of a fusion reactor.

FIG. 3 is a longitudinal sectional view showing a conventional method of attaching a lid to an open end of a blanket container.

FIG. 4 is a longitudinal sectional view showing another conventional method of attaching a lid to an open end of a blanket container.

FIG. 5 is a sectional view of a main part showing a defect by the method of FIG. 4;

FIG. 6 is a sectional view of a main part showing another defect by the method of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Blanket container 2 Open end inside (cooling water header) 4 Open end face 6 Lid 7 Rib 10 Thin plate 11 TIG welding 12 Seal welding 13 HIP joining

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification code FI G21B 1/00 G21B 1/00 M (72) Inventor Toshiko Kuroda 801-1 Mukayama, Naka-machi, Naka-gun, Ibaraki Pref. In-house Naka Research Institute (72) Inventor Satoshi Sato 801-1 Mukaiyama, Naka-machi, Naka-gun, Ibaraki Prefecture Nihonhara Child Research Institute Inside Naka Research Institute (72) Inventor Toshio Osaki 2-6-5 Minamisuna, Koto-ku, Tokyo Shigeru Kawasaki In the Tokyo Design Office of Industrial Co., Ltd. (72) Inventor Ichiro Kawaguchi 2-6-5 Minamisuna, Koto-ku, Tokyo Kawasaki Heavy Industries In Tokyo Design Office, Inc. (72) Inventor Shinichi Sato 2-6, Minamisuna, Koto-ku, Tokyo No. 5 Kawasaki Heavy Industries, Ltd. Tokyo Design Office

Claims (3)

[Claims] When a lid is sealed to a container, a thin plate is TIG-welded inside the open end of the container so as to be flush with the open end surface,
Next, a lid is placed on the end surface of the container and the outer surface of the thin plate, and the periphery of the mating surface is sealed and welded, and then the lid is HIP-bonded to the end surface of the container and the outer surface of the thin plate. Method. 2. The method according to claim 1, wherein the container is a container whose inside is divided into a plurality of parts by ribs. 3. The method according to claim 1, wherein the container is a first wall / blanket container of a nuclear fusion experimental reactor.