辐照监督管中Ni测量快中子注量率低泄漏修正研究

Research of Measuring Fast Neutron Fluence Rate Low-leakage Correction by Ni in NPP Irradiation Surveillance Capsule

核电站反应堆运行一段时间后改为低泄漏装载,这种将深燃耗元件布置在最外区与最初最外层布置新元件两种装载对辐照监督管的中子注量率影响很大,在辐照监督管中子注量测量中必须对其进行修正,这种低泄漏修正因子一般采用理论计算给出。本文提出利用辐照监督管中的Ni活化生成物58Co半衰期短的特点,测量得到低泄漏修正因子。结果表明:试验测量的修正因子与计算值符合很好,辐照监督管中直接采用Ni探测器测量低泄漏修正的方法是可行的。

Reactors in Nuclear power plant change to low leakage load from nomal load after several cycle operation.The two different load influence neutron fluence rate most and low leakage correction should make while measuring radiation surveillance capsule neutron fluence.The factor was given by calculation at nomal.This paper describes measuring this correction factor use short-life product 58Co from Ni monitor which disposal in surveillance capsule,the result comes that measuring correction factor is nearly fit to calculating correction factor.Measuring low leakage correction factor with Ni monitor is available.