Mitsubishi Heavy Industries Limited

Shinji Ookame

Katsunari Ohsono

Toshihiro Matsuoka

Suguru Hode

Tadashi Kimura

Masaharu Minami

Takeshi Yokoyama

Yasuhiro Sakaguchi

Kazuo Asada

Katsunari c/o Kobe Shipyard & Machinery W Ohsono

A radioactive-material container includes a container body that shields nuclear radiation, which includes a cavity that stores a basket containing a recycle fuel assembly, a lid that covers the cavity, and a metal gasket that includes a sealing area that makes a physical contact with the container body and the lid. The sealing area has a specific shape that disperses tightening stress acting on the metal gasket for a sealing.

Radioactive-material container, metal gasket for sealing the radioactive-material container, and method of manufacturing the metal gasket

Corner of each square pipe is molded into a terrace shape having steps. When a basket is constructed by these square pipes, steps of adjoining square pipes are assembled together face to face. Fuel rod aggregates are housed inside the square pipes and in a cells formed between the square pipes. Since the adjoining square pipes are assembled in a staggered arrangement, boundaries of the cells are defined by the walls of the square pipes itself.

Spent fuel housing square pipe, basket and spent fuel housing container

Heat conductive fins () are welded along both sides of a belt-like member () with a margin left along edges of the both sides, thereby to form a unit (). The unit () is welded to a body () with the heat conductive fins () from the outside of each fin. Next, another belt-like member () is covered over a gap between adjacent belt-like members (), and these members are welded from the outside. With this arrangement, there is no need to weld in a narrow and long space and the entire welding step is carried out from the outside, which makes it easier to assemble a cask.

Cask and method of manufacturing the cask

In the cask, a shape within a cavity of a barrel main body is formed in a shape corresponding to an outer shape of a basket. The basket has a structure obtained by alternately piling up plate-like members vertically. A heat conducting plate is provided on an outer periphery of the plate-like member. Accordingly, since the basket and the cavity are in a state of being in contact state in a wide area, an efficiency of heat conduction is improved.

Cask

Heat conductive fins are welded along both sides of a belt-like member with a margin left along edges of the both sides, thereby to form a unit. The unit is welded to a body with the heat conductive fins from the outside of each fin. Next, another belt-like member is covered over a gap between adjacent belt-like members, and these members are welded from the outside. With this arrangement, there is no need to weld in a narrow and long space and the entire welding step is carried out from the outside, which makes it easier to assemble a cask.

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Hyogo, Japan

Shinji Ookame