Heat pipe reactor core heat transfer scheme

Abstract

The invention belongs to the technical field of heat pipe cooling reactors, and particularly relates to a heat pipe reactor core heat transfer scheme, which comprises a liquid heat conduction materialloaded in a reactor core container (6), and a plurality of fuel rods (1) and a plurality of heat pipes (2) both arranged in the liquid heat conduction material. According to the invention, the problem that in the prior art, once gaps appear between the fuel rods (1) and the heat pipes (2), the heat transfer performance is remarkably reduced can be effectively solved, and the problem that the temperature of the adjacent fuel rods (1) is remarkably increased and even the safety of a reactor core is endangered due to the failure of a single heat pipe (2) is avoided. Also, the technical scheme proposed by the invention is not limited by reactor core power, and it is contemplated that the scheme can be applied to a full power range from hundred watts to megawatts.

Description

technical field [0001] The invention belongs to the technical field of heat pipe cooling reactors, and in particular relates to a heat transfer scheme of a heat pipe reactor core. Background technique [0002] Heat pipe cooled reactor (referred to as heat pipe reactor) is a new type of reactor that uses multiple heat pipes to take out the heat of the reactor. Compared with common loop reactors (such as pressurized water reactors), heat pipe reactors have many advantages such as passive, non-single-point failure, no pressure-bearing loop, simple system, and high reliability. In May 2018, the United States announced the success of KRUSTY, the ground prototype reactor of its kilowatt-level heat pipe reactor Kilopower. KRUSTY is the world's first heat pipe reactor, and its development cycle is only three years. The rapid and successful development of KRUSTY has made the heat pipe reactor a research hotspot for new reactors. [0003] The basic principle of the heat pipe stack i...

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Problems solved by technology

[0010] (1) For the fuel rod-heat pipe module schemes such as HPS, SAFE-30, SAFE-100a, SAIRS, HP-STMCs, etc., in the long-term high-temperature operating environment, due to the inhomogeneity of power and temperature, the fuel and heat pipe In addition, the fuel also has the problem of radiation swelling. These factors may cause the connection between the fuel rod and the heat pipe to be damaged and a gap will appear, which will greatly reduce the heat transfer performance between the fuel rod and the heat pipe. And lead to a significant rise in fuel operating temperature and even endanger the safety of the reactor

[0011] (2) For the schemes of fuel rod-heat pipe modules such as HPS, SAFE-30, SAFE-100a, SAIRS, and HP-STMCs, a single module contains only one heat pipe. If the heat transfer conditions between the modules are poor, it will directly lead to a significant increase in the operating temperature of the fuel rods in the module, endangering the safety of the reactor.

[0012] (3) For Kilopower's scheme, the fuel-heat pipe connection method of this scheme is only suitable for heat pipe stacks with low power and fewer required heat pipes. For heat pipe stacks with slightly larger power, this method cannot be applied

Even if the thermal contact is good at the beginning of operation, in the long-term high-temperature operation environment, due to the unevenness of power and temperature, there may be a large stress between the fuel rods, heat pipes and metal substrates. In addition, considering the fuel radiation According to swelling, etc., the connection between the fuel and the metal substrate, or between the metal substrate and the heat pipe may be damaged and a gap will appear, which will greatly reduce the heat transfer performance between the fuel and the heat pipe, resulting in a significant increase in the operating temperature of the fuel and even endangering the reactor. safety

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