An 18-month refueling and loading method for the core containing gadolinium in the first cycle of a pressurized water reactor

Abstract

The invention discloses an 18-month refueling and loading method for the first-cycle gadolinium-containing core of a pressurized water reactor. 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 were 1.8%, 2.4%, 3.1% and 3.9% respectively, and the number of fuel assemblies were 13, 44, 40 and 24 groups respectively. The solid burnable poison used in the circulating core is gadolinium-loaded fuel rods. The invention overcomes the difficulty of obtaining the required nuclear enthalpy rise factor in the three-zone layout, realizes the technical requirements of the 18-month long-period refueling design for the first cycle, and reduces the cycle length from 387 equivalent full-power days of annual refueling It is increased to 473 days of equivalent full power; the invention also solves the problem of extra radioactive waste generated by combustible poisons, and improves the flexibility and safety of the fuel assembly.

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 gadolinium-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 load...

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of 18-month refueling loading method of the gadolinium-containing core in the first cycle 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, and overcome the problems of using borosilicate glass as the radioactive waste produced by the burnable poison and the complicated manufacturing process

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