| 摘要 |
PROBLEM TO BE SOLVED: To provide a control rod which can suppress the generation of a stress corrosion crack by eliminating gaps. SOLUTION: The control rod 1 includes four blades 2 which have cruciform cross sections and extend in four directions from a shaft of the rod 1. Fig.1 shows one of the four blades 2. A handle 3 and a lower supporting member 4 are mounted to each of the blades 2. The lateral faces of the blades 2 are welded to a tie rod 5. Neutron absorbers 10 are sealed and encapsulated into a circular tube 11, and the circular tube 11 undertakes an increase in internal pressure associated with an He gas generated by neutron absorption. The circular tube 11 into which the neutron absorbers 10 are encapsulated is inserted into a deformed tube 13, and the deformed tube 13 is made to closely contact with the outside lateral face of the circular tube 11. Upper and lower ends of the specially shaped tube 13 are hermetically joined to the handle 3 by the lower supporting member 4, thus enabling the inside of each of the blades 2 to be isolated completely from reactor water and obtaining a structure without any gaps. COPYRIGHT: (C)2011,JPO&INPIT |
