Improved annular fuel element of supercritical water reactor and fuel component consisting of fuel element

Abstract

The invention discloses an improved annular fuel element of a supercritical water reactor and a fuel component consisting of the fuel element. The improved annular fuel element comprises an inner wrapping shell and an outer wrapping shell coaxial with the inner wrapping shell, wherein granular fuel is filled between the inner wrapping shell and the outer wrapping shell; and a heat isolation coating layer is also arranged between the granular fuel and the inner wrapping shell. The fuel component consists of the annular fuel element, an upper heat isolation plate, a lower heat isolation plate, an upper flow guide plate and a lower flow guide plate which are matched with one another; a moderator on the inner side of the annular element and a coolant which is arranged on the outer side and flows in an opposite direction can be effectively shunted; no special control stick guide pipe is arranged in the component, so that the structural design of the component is simplified, the using amount of structural materials is reduced, and the economical property is improved; the advantages of uniformity in moderation of the annular fuel element, heat transmission on both sides, low fuel temperature and the like are fully developed; the engineering application feasibility is greatly improved; and therefore, the supercritical water reactor with relatively high economical property and safety can be designed.

Description

technical field [0001] The invention relates to a nuclear reactor fuel assembly, in particular to an improved annular fuel element suitable for a supercritical water reactor and the fuel assembly formed therefrom. Background technique [0002] The design of supercritical water reactor components needs to solve two key technical problems: reduce the temperature of fuel pellets and cladding; obtain sufficient and uniform moderation of fuel elements. and water rod design technology have solved the above problems to a certain extent, but the design complexity of the core structure has increased significantly, and the engineering feasibility has been significantly reduced. Key technical issues to be solved urgently in stack design. [0003] The annular element is a new generation of high-performance fuel element developed for light water reactors in the world. From the inside to the outside, it is the inner cladding, the inner air gap, the fuel pellets, the outer air gap, and th...

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Problems solved by technology

[0006] The purpose of the present invention is to provide an improved annular fuel element applied to a supercritical water reactor and

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