The management method of a multi -circulating fuel for 18 months of pile pile cores

Abstract

The invention discloses a management method for 18-month refueling and multi-cycle fuel in a pressurized water reactor core. The pressurized water reactor core is composed of 121 groups of fuel assemblies, and the first cycle fuel assemblies are divided into 4 according to the enrichment degree of U-235. The U-235 enrichment degrees of zone 4 and zone 4 are 1.9%, 2.6%, 3.1% and 3.7% respectively, and the fuel assemblies are 25, 28, 44 and 24 groups respectively. The solid burnable poison used in the core is an integrated gadolinium solid burnable poison; from the second cycle to the balance cycle, 1 / 3 of the new fuel assembly of the whole stack is loaded into each refueling, and the U-235 enrichment of the new fuel assembly The enrichment degree of U-235 is higher than that of the first cycle fuel assembly. The core adopts the low-leakage loading mode, and the solid burnable poison used in the core is integrated gadolinium solid burnable poison. The method realizes 18-month long-term refueling quickly and easily.

Description

technical field [0001] The invention relates to the technical field of pressurized water reactor core refueling, in particular to a management method for 18-month refueling and multi-cycle fuel of a pressurized water reactor core. Background technique [0002] PWR core fuel management generally refers to the determination of the enrichment of fuel used in the core, the concentration of burnable poisons, and The type and arrangement of various components and poisons in the core, etc., make the design results of the reactor core meet the nuclear design criteria and the overall requirements of the power plant. The quality of core fuel management directly affects the economy and safety of nuclear power plants, and is the basis for subsequent safety analysis or evaluation. [0003] At present, there are mainly three types of core fuel management methods for nuclear power plants in service and under construction in China: 1) fuel management methods in which all cycles are refuele...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a management method for 18-month refueling and multi-cycle fuel of the pressurized water reactor core, which solves the problems of short refueling cycle and long refueling cycle caused by the existing management method, but the realization process is tortuous, Through the management method described in the present invention, the design requirements of the 18-month long-period refueling of the transition cycle and the balance cycle can be realized quickly and easily

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