Axial fuel shuffling metal cooled reactor and management method

Abstract

The invention discloses an axial fuel shuffling metal cooled reactor and a management method. A reactor core structure of the axial fuel shuffling metal cooled reactor is an integral honeycomb regularhexagon assembly channel which comprises fuel assembly channels and control rod assembly channels; the control rod assembly channels and the fuel assembly channels are arranged in a staggered manner;each fuel assembly channel is provided with three standard fuel assemblies in the axial direction, the bottommost layer is an old fuel assembly subjected to a plurality of burn-up cycles, and the topmost layer is a new fuel assembly loaded into the reactor core; after the old fuel assemblies are unloaded from the fuel assembly channels, the residual fuel assemblies in the fuel assembly channels sequentially move downwards in the axial direction, and the new fuel assemblies are loaded from the tops of the fuel assembly channels. According to the invention, the axial and radial power distribution of the reactor core is effectively flattened, so that the burnup of the fuel assemblies is more uniform, the service life of the fuel assemblies is greatly prolonged, and the average unloading burnup depth of the reactor core is increased.

Description

technical field [0001] The invention relates to the technical field of nuclear reactors, in particular to an axial refueling metal cooling reactor and a management method. Background technique [0002] Based on the closed uranium-plutonium fuel cycle system, liquid metal cooled reactors have strong capabilities in nuclear fuel transmutation and nuclear fuel multiplication, and play an important role in the sustainable development of nuclear energy. To this end, countries around the world have developed various types of liquid metal cooled reactors with different power scales, such as the American modular sodium-cooled fast reactor SMFR, the Japanese sodium-cooled fast reactor JSFR, the Russian sodium-cooled fast reactor BN600 / 800, and the Chinese sodium-cooled fast reactor. Reactor CFR600, Russia's small lead-bismuth cooled SVBR-75 / 100 and pure lead cooled BREST-OD-300 fast reactor, European lead-cooled ELSY fast reactor, etc. Some liquid metal cooled reactors have entered t...

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Problems solved by technology

[0003] The purpose of the present invention is to provide an axial refueling metal cooling reactor and its management method, which can solve the problem of uneven axial burnup distribution of existing liquid metal cooling reactors, and without changing the burnup limit of existing fuel assemblies, Improve the service life of fuel assemblies, increase the average unloading burnup depth of the core, and enhance the transmutation and multiplication capabilities of nuclear fuel

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