MOX (Mixed Oxide) fuel assembly structure suitable for supercritical water reactor

Abstract

The invention discloses an MOX (Mixed Oxide) fuel assembly structure suitable for a supercritical water reactor, belonging to the field of nuclear power generation. A plurality of water boxes are formed into a square shell, a plurality of water rods are arranged in the shell formed by the water boxes, an MOX fuel rod with the diameter of R is arranged in a gap between every two adjacent water rods, the water rods include large water rods and small water rods, the cross section of each large water rod is of a square with the length of 3R and the width of 3R, the cross section of each small water rod is of a rectangle with the length of 3R and the width of R, gaps between every two adjacent water rods and between each water rod and each water box are both R and filled by the MOX fuel rods which are tidily arranged, and gaps between the MOX fuel rods and the water rods or between the MOX fuel rods and the inner walls of the water boxes form a fuel agent cooling channel. By using the MOX assembly structure is adopted in the supercritical water reactor, the same effects with the traditional structure in which only a UO2 assembly design is used can be achieved, and the condition of uneven power distribution factors of an assembly can be improved. The MOX fuel assembly structure has the characteristics of simple structure and little improvement on the traditional supercritical water reactor assembly and can be used for improving the safety of the reactor.

Description

technical field [0001] The invention belongs to the field of nuclear power generation, in particular to a MOX fuel assembly structure suitable for supercritical water-cooled reactors. Background technique [0002] The supercritical water-cooled reactor is one of the fourth-generation nuclear energy reactor types recognized by the international nuclear energy community. The supercritical water-cooled reactor operates at a temperature and pressure exceeding the thermal critical point of the working fluid. It is a very complicated process to generate heat from the core fuel of a supercritical water-cooled reactor. The supercritical water-cooled reactor assembly structure mainly includes quadrilateral assembly and hexagonal assembly. In recent years, all advanced nuclear energy countries have carried out in-depth research on supercritical water reactor components, and various component designs have emerged. The power distribution in the axial direction of the module is improve...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the use of MOX fuel in the structural design of the current supercritical water-cooled reactor assembly, which will cause a large component power non-uniformity factor, and provides a MOX fuel assembly structure suitable for supercritical water-cooled reactors

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