- 专利标题： Closed vessel for radioactive substance, seal-welding method for closed vessel, and exhaust system used for seal-welding method
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申请号： US10654026申请日： 2003-09-04
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公开(公告)号： US06990166B2公开(公告)日： 2006-01-24
- 发明人: Kenichi Matsunaga , Ganji Abe , Kazuo Murakami , Koichi Ue , Takashi Shige , Etsuryo Kita , Shizuo Inoue , Tsuneo Mandai
- 申请人： Kenichi Matsunaga , Ganji Abe , Kazuo Murakami , Koichi Ue , Takashi Shige , Etsuryo Kita , Shizuo Inoue , Tsuneo Mandai
- 申请人地址： JP Tokyo
- 专利权人： Mitsubishi Heavy Industries, Ltd.
- 当前专利权人： Mitsubishi Heavy Industries, Ltd.
- 当前专利权人地址： JP Tokyo
- 代理机构： Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
- 优先权： JP2001-200174 20010629
- 主分类号： G21F5/008
- IPC分类号： G21F5/008
摘要：
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.
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