| 摘要 |
PROBLEM TO BE SOLVED: To provide control rods which can be used properly as neutron absorbers that will not swell even if they are irradiated with a large amount of neutrons, hardly loses the integrity even in case of a great earthquake, and enhances the versatility as control rods for those of the same structure or control rods for shutdown. SOLUTION: Plate wings are made by laying out bars filled with neutron absorbers in parallel; four wings are fastened by a front-end structural material and a tail-end structural material of cruciform cross sections and a shorter cruciform combining member is also alienated in the axial direction of one lateral face of each wing and is fastened. A square bar filled with neutron absorbers is placed at the end parts and the central parts on the central axis side of the cross in each wing; a square bar filled with neutron absorbers which is plane at least on the central side of the wing is located at the outside end of the cross in each wing and the square bars are combined by the combining member to make the parts of the square bars located on the central side and in both end sections of the cross in each wing thick-walled parts which are thicker in comparison with the parts between the central side and both end sections. COPYRIGHT: (C)2009,JPO&INPIT
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