压水堆二次中子源替代一次中子源的初步可行性分析

在反应堆一次中子源供应存在风险的背景下，为分析压水堆二次中子源替代一次中子源的可行性，计算了二次中子源在运行机组辐照一个循环后的中子源强，并基于某新建CPR1000反应堆首循环堆芯参数及装料顺序，计算装料过程中堆内外各中子探测器的计数率。结果表明，二次中子源在结束辐照后的4个半衰期（约240 d）内用于替代CPR1000反应堆首循环一次中子源可满足技术规范对中子探测器计数率的要求，证明压水堆二次中子源替代一次中子源具有一定可行性。 

Feasibility Study on Substitution of Primary Neutron Source with Secondary Neutron Source in PWRs

This paper analyzes the feasibility of substituting the primary neutron source with the secondary neutron source (SNS) in pressurized water reactor under the background that the supply of the primary neutron source has risks. The neutron source intensity of SNS which experienced one fuel cycle irradiation in a working PWR was calculated. Based on the core parameters and loading sequence of the first cycle of a new CPR1000 reactor, the counting rates of neutron detectors inside and outside the reactor were calculated at various loading steps. The results show that the substitution of the primary neutron source with the irradiated SNS within 4 half-lives (about 240 d) in the CPR1000 reactor satisfies the requirements of neutron detector counting rates in related technical specifications, thus proving the feasibility of substituting the primary neutron source with SNS.