ASSEMBLY STRUCTURE OF BIOLOGICAL SHIELDING MEMBER OF NUCLEAR REACTOR

PURPOSE:To enable the limitation of an activation area to neutron shielding members and to reduce the man-hours of disassembly and the exposure during work by using the neutron shielding members as the form for concrete placement to assemble a biological shielding wall. CONSTITUTION:Assembly of the neutron shielding members 14 is first executed upon completion of the installation of a reactor storage container 13. This assembly is executed by connecting bolts 17 fixed to the shielding members by using metallic fixtures 16 and by fixing the neutron shielding members 14 to each other. The supports from the reactor storage container 13 are used at need in the same manner as heretofore in this fixing. Setting of steel reinforcing bards 8, 9, 10 is thereafter executed and concrete 12 is placed after setting of the outside form. The installation is completed upon waiting of concrete curing. Since the neutron ray irradiation area from the core is covered by the neutron shielding members 14 according to such construction, the activation area is limited in the neutron shielding members 14.