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    • 10. 发明专利
    • BOLING WATER REACTOR
    • JPS5450787A
    • 1979-04-20
    • JP11685377
    • 1977-09-30
    • NIPPON ATOMIC IND GROUP COTOKYO SHIBAURA ELECTRIC CO
    • WATANABE SHIYOUICHI
    • G21C7/10G21C7/08G21C7/113
    • PURPOSE:To uniformize the output distribution and the burn-up distribution and to reduce the troublesome of operating method, by means of composing the cross type control rod by two groups having a low reactivity contol rod with week absorbing property of neutron and a high reacftivity control rod with strong absorbing property of neutron. CONSTITUTION:High reactivity degree control rods 1 ( indicated by a full line ) and low reactivity degree control rods 2 ( indicated by a broken line ) are regularly arrenged between many fuel assemblies within a core 3. When th reactor is in the output operation, all of the high reactivity degree control rod 1 are withdrawn and the low reactivtiy degree control rod 2 is only inserted into the core. The control rods 1,2 are cross types in the cross sections, and have a central structure composing of the same material and wings 6. In a case of the low reactivity degree control rod 2, members 5,6 are meade of a stainless steel such as SuS, and the absorbing rod tube sealed in Hf02 and absorbing tubes of Hf, In are contained in the inner part. In a case of the high reactivity degree control rod 1, the members 6 contain an absorbing rod tube etc. sealed by B-10 concentrated boron carbide, and Eu2 O3 in the inner part composed of Hf.