源项调查技术在某核电站源项异常分析中的应用实践

Application Practice of Source Term Investigation Technology in a Source Term Anomaly Analysis in a Nuclear Power Plant

源项调查技术已经在国内外核电站广泛应用,源项调查所获得的核素种类、表面活度、核素剂量率贡献占比等信息是重要的源项基础数据。这些数据为源项控制策略制定、源项异常分析、辐射屏蔽设计、机组源项信息建档等工作提供了重要支撑。文章介绍了某CPR1000机组使用碲锌镉γ谱测量系统开展源项调查的情况,以及通过源项调查结果辅助确定机组源项异常原因的实践经验。

Source term investigation technology has been widely applied in nuclear power plants both domestically and internationally.The information obtained from source term investigation,such as radionuclide types,surface contamination activity,and contribution ratio of radionuclide dose rate,is important source term basic data.These data provide important support for the development of source term control strategies,the analysis of source term anomalies,radiation shielding design,and archiving reactor unit source term information.This article introduces the source investigation of a CPR1000 unit using the CZT gamma spectrum measurement system and the practical experience of assisting in determining the causes of reactor unit source term anomalies,through the results of source term investigations.