Mitsubishi Heavy Industries Limited

Ganji Abe

Kenichi Matsunaga

Kazuo Murakami

Takashi Shige

Shizuo Inoue

Koichi Ue

Etsuryo Kita

Tsuneo Mandai

Tadashi Shiraishi

Kazuo Asada

Shigeru Kunishima

A primary lid is set in a top opening of a vessel body that contains radioactive substance, and closes the top opening. The peripheral edge portion of the primary lid is welded to the inner peripheral surface of the vessel body. As the primary lid is welded, steam in the vessel body is discharged to the outside through a discharge hole in the primary lid, and a shield gas is filled into or run through a space in the outer peripheral portion of the primary lid, so as to prevent the steam from flowing into the welding portion.

Closed vessel for radioactive substance, seal-welding method for closed vessel, and exhaust system used for seal-welding method

A container body of a concrete cask includes a storage portion that stores a canister. A refilling system includes a reduction cylinder having an outside diameter smaller than the diameter of the storage portion and an inside diameter larger than the diameter of the canister, a first lift mechanism configured to raise and lower the reduction cylinder between a down position in the storage portion and an up position wherein it is drawn out of the storage portion, and a second lift mechanism having a holding portion for holding one end portion of the canister and configured to raise and lower the canister with respect to the container body. In refilling operations, the canister is loaded into and unloaded from the storage portion of the container body by the second lift mechanism with the reduction cylinder set in the storage portion.

Storage container, storage container refilling system, and refilling method

Growing community of inventors

Kobe, Japan

Ganji Abe