18-month feed replacement method for 1-million kW unit of China voltage water pile nucleus power station

Abstract

The present invention is suitable for stack core fuel management field of pressureized water reactor, provides a method for changing fuel of million kilowatt machine set of Chinese pressureized water reactor nuclear power plant for eighteen months. The method includes the steps as follows: in the first circulation, improving the enrichment degree of original reactor core fuel component, and changing arrangement mode of burnable poison, as well as reaching a circulation length of eighteen mouths during the first circulation; in the behind circulation, to improve the enrichment degree of the fuel component further from the second circulation, and transferring into a balance circulation rapidly, by means of changing fuel for each eighteen mouths, and only changing fuel component of one second to one third reactor core, and placing new fuel component within the reactor core, the burn-up fuel component is placed outside the reactor core. The method implements a circulation length of 473 equivalent days at full capacity, and prolongs circulation period and improves fuel consumption, as well as implements completely low neutron leakage load in the behind circulation, and has quite supernal economical efficiency and working flexibility.

Description

technical field [0001] The invention belongs to the field of pressurized water reactor core fuel management, and in particular relates to an 18-month refueling method for a one-million-kilowatt unit of a Chinese pressurized water reactor nuclear power plant. Background technique [0002] In the reactor core fuel assembly layout of the PWR nuclear power plant, the traditional loading mode in the reactor core is the high leakage (OUT-IN) mode, that is, the core fuel assembly is divided into three enrichment areas according to the enrichment degree. The fuel assembly with the highest enrichment is placed in the outer area of ​​the core, and the other two fuel assemblies with lower enrichment are arranged in the inner area of ​​the core in the manner of a chessboard. The refueling is usually an annual refueling, each refueling replaces 1 / 3 of the core fuel assemblies, removes the fuel assemblies with the deepest burn-up, puts new fuel assemblies into the outer area, and puts the...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiment of the present invention is to provide an 18-month refueling method for a one-million-kilowatt unit of a pressurized water reactor nuclear power plant in China, aiming at solving the problem of using OUT-IN mode layout of the traditional core fuel assembly and renewing 1 / 3 of the fuel each time for annual refueling component approach, resulting in short cycle times and low fuel consumption of fuel components

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