A 18-month refueling and loading method for the first-cycle boron-containing core of a pressurized water reactor

Abstract

The invention discloses an 18-month refueling and loading method for the first-cycle boron-containing core of a pressurized water reactor. The core of the pressurized water reactor 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 enrichment degrees of U-235 in zone 4 and zone 4 are 1.9%, 2.6%, 3.1% and 3.7% respectively, and the number of fuel assemblies are 21, 32, 44 and 24 respectively. The solid burnable poison is a borosilicate glass rod. The invention overcomes the difficulty of obtaining a satisfactory nuclear enthalpy rise factor in the three-zone arrangement, and while ensuring the high safety of the reactor, realizes the technical requirements of the first-cycle 18-month long-period refueling design, and the cycle length is changed from The 387 equivalent full power days for annual refueling is increased to 473 equivalent full power days.

Description

technical field [0001] The invention relates to the technical field of pressurized water reactor core refueling, in particular to an 18-month refueling and loading method for the first cycle boron-containing core of a pressurized water reactor. 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, the traditional method of loading the first cycle core of the domestic 600,000-kilowatt pressurized water reactor nuclear power plant is mainly the annual refueling loading m...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a 18-month refueling loading method for the first cycle boron-containing core of a pressurized water reactor, which solves the short problem of the first cycle refueling period caused by the existing loading method, and can be achieved by the loading method of the present invention. Fast and easy to achieve the goal of 18-month long-term refueling in the first cycle

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