Spiral cross-shaped metal fuel element reactor core

Abstract

The invention discloses a spiral cross-shaped metal fuel element reactor core. The spiral cross-shaped metal fuel element reactor core comprises a reactor core active region, a radial reflecting layer, an axial upper reflecting layer and an axial lower reflecting layer; the reflecting layer is made of aluminum oxide; the reactor core active region comprises a first area assembly, a second area assembly and a control rod assembly; the three types of assemblies are densely laid in six circles of regular hexagons; fuel elements are arranged in a spiral cross shape and in a triangular shape, fuel is U-Zr alloy with the Zr mass content being 10%, the U235 enrichment degree is 19.75%, and a cladding material is stainless steel; the control rod assembly comprises a control body, a guide cylinder and an assembly box; and the control body comprises a cylindrical boron carbide control rod and a stainless steel cladding. The excellent thermal hydraulic performance of the spiral fuel is maintained, the volume of the reactor core is effectively reduced, the fuel peak temperature is relatively low, and the reactor core is suitable for a novel reactor which is small in size, high in temperature parameter and economical.

Description

technical field [0001] The invention belongs to the technical field of advanced nuclear energy development, and in particular relates to a spiral cross-shaped metal fuel element core. Background technique [0002] As a high-performance new fuel, spiral fuel has better thermal and hydraulic performance. Under the same safety limit, it can increase the power density of the core, thereby increasing the core outlet temperature, thereby improving the thermal efficiency of the energy conversion system, which is beneficial to the reactor. economy. At present, the existing schemes are usually spiral cross fuel-quadrangle arrangement and spiral triangle fuel-triangle arrangement. The fuel used is ceramic fuel pellets or TRISO fuel, which has relatively low thermal conductivity and high fuel peak temperature. , which is not conducive to making full use of the advantages of spiral fuel; at the same time, due to the limitation of enrichment, in order to achieve higher burnup, TRISO fue...

AI Technical Summary

Problems solved by technology

At present, the existing schemes are usually spiral cross fuel-quadrangle arrangement and spiral triangle fuel-triangle arrangement. The fuel used is ceramic fuel pellets or TRISO fuel, which has relatively low thermal conductivity and high fuel peak temperature. , which is not conducive to making full use of the advantages of spiral fuel; at the same time, due to the limitation of enrichment, in order to achieve higher burnup, TRISO fuel often leads to a larger core volume

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