压水堆核电厂二回路放射性污染控制要求研究

Study on Control Requirements of Radioactive Pollution in Secondary Cycle of PWR Nuclear Power Plants

压水堆核电厂蒸汽发生器传热管处一二次侧泄漏将导致二回路系统放射性污染,影响向环境的气液态放射性流出物释放,需设置泄漏率监测系统和蒸汽发生器排污系统以使二回路系统水质和向环境的放射性释放控制在可接受的范围内。通过分析二回路系统中放射性的迁移途径,建立二回路系统源项及二回路气液态放射性流出物源项的计算模型。根据建立的计算模型和假设的二回路系统水质控制要求,确定蒸汽发生器传热管处泄漏率设计基准,并分析蒸汽发生器泄漏监测和蒸汽发生器排污系统的设计要求。

PWR nuclear power plant steam generator tube leak will result in radioactive contamination, affecting the release of radioactive effluent to the environment. It is necessary to set the leak rate monitoring system and steam generator blowdown system for controlling the secondary cycle system water quality and the radioactive environment release within an acceptable range. By analyzing the migration path of the radioactive secondary cycle, the calculation models of secondary cycle source term and radioactive effluent are obtained. According to the calculation models and assumptions of the secondary cycle radioactive control requirements, the steam generator tube leak rate at design basis is determined, and the design requirements on leak detection system and blowdown system of the steam generator are developed.