Refueling method for evenly circulating pressurized water reactor core for 24 months

Abstract

The invention belongs to the technical field of reactor design, and relates to a refueling method for evenly circulating a pressurized water reactor core for 24 months. According to the refueling method, 90-95 groups of fuel assemblies which have the longest burning time in 170-180 groups of fuel assemblies of the reactor core are replaced with new fuel assemblies each time, when the fuel assemblies are replaced, the new fuel assemblies are placed at a secondarily outer circle of the reactor core and at the position close to the center of the reactor core, burned fuel assemblies are placed at other positions of the reactor core, and the fuel assembly replacing is conducted once every 24 months. By the adoption of the refueling method for evenly circulating the pressurized water reactor core for 24 months, the cycle of the evenly circulating pressurized water reactor core can be increased to 24 months from 18 months.

Description

technical field [0001] The invention belongs to the technical field of reactor design and relates to a refueling method for a pressurized water reactor core balance cycle of 24 months. Background technique [0002] In the management of reactor core fuel, on the basis of ensuring the safety of the core, increasing the utilization rate of nuclear fuel and prolonging the refueling cycle of the reactor core can prolong the service life of the nuclear power unit and reduce the number of shutdowns, thus effectively Reduce the cost of overhaul, improve the capacity factor of nuclear power units, and improve the economics of nuclear power plants. [0003] At present, the fuel management strategy of 18-month refueling is adopted for the core composed of 177 fuel assemblies. The balance cycle replaces 68 sets of 4.45% fuel assemblies each time, using low-leakage loading. Although such a management strategy can make the life span of the core reach 475EFPD, which meets the requirement...

AI Technical Summary

Problems solved by technology

Although such a management strategy can make the life span of the core reach 475EFPD, which meets the requirement of 18-month refueling, there is a realistic demand for further extension of the core refueling cycle.

Images