Pressurized water reactor core and refuelling loading method for new assemblies thereof

Abstract

The invention discloses a pressurized water reactor core and a refuelling loading method for new assemblies thereof. According to the refuelling loading method for the new assemblies, during loading of a batch of new assemblies, a same amount of burnt-up assemblies are discharged; for a same batch of loaded new assemblies, a part of the new assemblies are to be discharged from the pressurized water reactor core after N cycles of burnup in core, and a rest part of the new assemblies are to be discharged from the core after N+1 cycles of burnup in the core, wherein N is a natural number, and during primary loading into the core, the degree of uranium enrichment in the part of the new assemblies is lower than the degree of uranium enrichment in the rest part of the new assemblies. With such a technical scheme provided by the invention, the new assemblies are of two degrees of enrichment, cyclic assemblies with low burnup may employ a low degree of enrichment, so fuel cost is reduced; meanwhile, a residual uranium enrichment degree of the assemblies during discharging of the assemblies can be reduced, and usage efficiency of a fuel can be improved.

Description

technical field [0001] The invention relates to the field of fuel management of a pressurized water reactor nuclear power plant, in particular to a pressurized water reactor core and a new component refueling core loading method thereof. Background technique [0002] At present, domestic pressurized water reactor nuclear power plants have long-term refueling cycles, such as 18-month refueling, and a new fuel assembly with uranium enrichment is used to design the core loading scheme. At present, the annual refueling of domestic pressurized water reactor nuclear power plants also uses a new fuel assembly with uranium enrichment to design the core loading scheme. [0003] Take the 18-month refueling balance cycle loading scheme of a million-kilowatt pressurized water reactor nuclear power plant as an example to illustrate. The core of the 157 sets of components of the million-kilowatt pressurized water reactor nuclear power plant is arranged in 15 rows*15 columns, and the core...

AI Technical Summary

Problems solved by technology

Since the same batch of 72 components only uses the same uranium enrichment rate of 4.45%, when the core is unloaded, the 16 sets of components are unloaded after three cycles of burnup, and the burnup is relatively high, and the remaining uranium is enriched. However, after two cycles of burnup of the 56 group, the component burnup is less, and the remaining uranium enrichment degree is still high, resulting in waste

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