Control rod for nuclear reactor

Abstract

A control rod for a nuclear reactor is composed of a center structural member, a plurality of wings each composed of a sheath member of long plate structure having a U-shaped cross section and secured to the center structural member, a front end structural member secured to a front end side of the wing in a wing inserting direction in a reactor core, a terminal end structural member secured to a terminal end side of the wing, a plurality of integral type neutron absorbing elements each having a plate structure accommodated in each of the sheaths in a row in a longitudinal direction thereof and each being formed in plate shape by integrating one or more neutron absorbing plates, and a plurality of load supporting members for supporting weights of the integral type neutron absorbing elements. A length in the sheath longitudinal direction of at least one set of the integral type neutron absorbing elements accommodated in the wing is reduced, and the reduced integral type neutron absorbing elements are supported to the U-shaped sheath by the load supporting members to thereby reduce a local load applied to the U-shaped sheath.

Description

technical field [0001] The present invention relates to a control rod for a nuclear reactor, and in particular to a long-life control rod for a nuclear reactor capable of improving mechanical robustness and stability in a boiling water nuclear reactor. Background technique [0002] For the control rods of Boiling Water Reactor (BWR, BoiLing Water Reactor), on the central structural material with a cross-shaped central cross-section, a vertically long skin with a deep U-shaped cross-section is fixed to form a cross-shaped cross-section. Four flanks containing neutron absorbing material are formed inside. The front-end part and the end part of the side are respectively provided with a front-end structural material and a terminal structural material to form a control rod. [0003] In the traditional control rods, the U-shaped skin is made of stainless steel (hereinafter referred to as SUS), and as the neutron absorbing material contained in the skin, boron carbide (B 4 C) A n...

AI Technical Summary

Problems solved by technology

[0030] Therefore, although it is generally hoped that the skin 7 should be thinned in the nuclear reactor, because the thickness of the skin 7 is related to the mechanical and physical strength of the skin 7, excessive reduction will become a factor that damages the firm stability of the machine, and hinders the control. Extended life of rod 1

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