A Double Clad Fuel Element with Enhanced Moderation Capability

Abstract

The invention belongs to the technical field of nuclear reactor fuel elements, and in particular relates to a double-clad fuel element with enhanced moderation capability, comprising: an upper end plug, an air cavity spring A, an inner cladding, an air cavity spring B, an outer cladding, and several pellets A , several pellets B and lower end plugs; several pellets A are stacked at the lower end of the inner cladding, and the upper part of the pellets A is provided with an inner cladding fission gas cavity; , the other end of the fission gas cavity of the inner cladding is also provided with an air cavity spring A; the outer wall of the inner cladding is covered with an outer cladding; several pellets B are stacked from bottom to top between the outer wall of the inner cladding and the inner wall of the outer cladding; The upper part is equipped with an air cavity spring B; the upper end plug is positioned and connected with the top of the inner cladding and the outer cladding; the lower end plug is welded and connected with the bottom of the inner cladding and the outer cladding; Moderated material-fissile material form combination.

Description

technical field [0001] The invention belongs to the technical field of nuclear reactor fuel elements, and in particular relates to a double-clad fuel element with enhanced moderation capability. Background technique [0002] In order to improve heat exchange efficiency, many new nuclear reactor designs choose coolants with higher applicable temperature and stronger heat transfer capabilities, such as supercritical carbon dioxide, alkali metal sodium, potassium, lead-bismuth, etc. The coolant does not have a moderating effect. The reactor is physically designed as a fast neutron reactor. In order to meet the design requirements of criticality and core miniaturization, the reactor has a large amount of uranium and a high enrichment degree of uranium (more than 40%). In order to reduce the uranium load, reduce the fuel enrichment requirement, and improve the economy of the new reactor, moderator materials can be added to the core, and the reactor can be designed as a thermal n...

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Problems solved by technology

[0004] The purpose of the present invention is to design a double-clad fuel element with enhanced moderation capability in view of the deficiencies of the existing technology, which is used to solve the problem that water cannot be used as a moderator under high temperature in the prior art, and the reactor core has a large amount of uranium and fuel enrichment The technical problem of large core volume caused by high density

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