Metal working – Method of mechanical manufacture – Disassembling
Patent
1993-08-30
1994-12-06
Hughes, Tom
Metal working
Method of mechanical manufacture
Disassembling
294266, 29723, 29906, 376261, B23P 1900, G21C 3334
Patent
active
053698665
ABSTRACT:
A key member, a method for insertion and/or removal of the fuel rods in a nuclear fuel assembly using the key member and a method of disassembling the nuclear fuel assembly using the same key member are disclosed. The key member has first projections and second projections formed on the opposite faces of an elongated key body. In the insertion or removal of the fuel rods or in the disassembling the nuclear fuel assembly, the key member is inserted into the grid and rotated to bring the first projections and the second projections into engagement with the straps of the grids and the springs on the straps to thereby the springs are deflected in a direction away from the dimples opposing to the springs. In this situation, the insertion and removal of the fuel rods can be carried out. Further, in disassembling the nuclear fuel assembly, space required for inserting the key member into the grids may be ensured by subjecting prescribed portions of control rod-guide pipes and instrumentation pipes to cutting work and bulging the cut ends to move the cut end away from that of the opposing cut ends of the cut piece. The space may be formed by removing the control rod-guide pipes and instrumentation pipes after having formed slits in the pipes.
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Kato Akihiro
Yamazaki Shuji
Yoshida Masashi
Hughes Tom
Mitsubishi Nuclear Fuel Co.
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