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    • 4. 发明专利
    • CONTROL ROD
    • JPH0213891A
    • 1990-01-18
    • JP16254188
    • 1988-07-01
    • HITACHI LTD
    • FUKUMOTO TAKASHIMAKI HIDEOSAITO SOZOYASUDA TETSUOOZAWA MICHIHIRO
    • G21C7/10G21C7/24
    • PURPOSE:To prevent damage of a neutron absorber rod due to corrision with lower and upper structural members at a reactor scram by fixing ends of the neutron absorber rods arranged in a sheath using a coil spring or the like. CONSTITUTION:An U shaped sheaths 12 are arranged crosswise and fixed to an tie rod 11 and then neutron absorber rods 3 are laid in the sheath 12. Upper and lower ends of the neutron absorber rods are fixed by using coil springs or the like at an upper support 6 and a lower support 7. With this process, a damage by a corrision of the neutron absorber rods 3 with upper and lower supports 6 and 7 caused by a reactor scram, can be prevented. Also, the neutron absorber rod 3 is divided into two regions of an upper and lower regions at the upper region is constituted to be solid and the lower one to be hollow so that a cooling water can be introduced into the lower region. In this way, an effective neutron absorbing capability corresponding to a neutron importance distribution during a nuclear reactor shut down can be obtained within a period of the reactor shut down. Moreover, a weight of control rods can be diminished and an operability of the control rods can be improved.