Annular fuel element and annular fuel supercritical water reactor

Abstract

The invention discloses an annular fuel element and an annular fuel supercritical water reactor. The annular fuel element is a cylindrical structure of which the cross section is annular, and consists of an outer wrapping shell, an outer gas gap, a fuel core block, an inner gas gap and an inner wrapping shell from an outer layer to an inner layer. The water reactor consists of a pressure container, a descending section, a reactor core basket and an annular fuel assembly from outside to inside, wherein the annular fuel assembly is formed by arranging a plurality of square annular fuel assemblies or a plurality of hexagonal annular fuel assemblies axially in parallel. In the annular fuel element and the annular fuel supercritical water reactor, the temperature of the fuel core block and the wrapping shells are reduced by increasing a heat transfer area effectively; and low-temperature water serving as a moderator is positioned in an inner channel of the fuel element, so the physical feedback is more uniform, and radial power factors can be reduced effectively.

Description

technical field [0001] The invention belongs to the technical field of reactors, and relates to a supercritical water reactor, in particular to an annular fuel supercritical water reactor with higher safety performance. Background technique [0002] Supercritical Water Reactor (SCWR) is one of the six reactor types selected by the Fourth Generation International Forum (GIF) for research and development. It is essentially a reactor operating under high temperature and high pressure conditions. The outlet temperature is about 500°C, which makes the thermal efficiency of SCWR about 45%, which is much higher than the 33% efficiency of the current light water reactor, and can significantly simplify the power plant facilities. So SCWR is considered as a promising advanced nuclear energy system. [0003] Although supercritical water reactors have many advantages, they also face some problems that need to be solved urgently. (1) In thermal supercritical water reactors, in order to...

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Problems solved by technology

Existing supercritical water reactor designs (such as Japan, Europe, etc.) generally use traditional rod-shaped fuel elements. By using carefully selected empirical relations and assumptions, the calculation results can basically meet the design requirements. However, if the design , manufacturing deviation, the huge uncertainty of the relationship itself, etc., the design limit may break through

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