核电厂一回路放射性异常监测系统的改进  

Improvement of Primary Radioactivity Anomaly Monitoring System in Nuclear Power Plants

作　　者：徐慧波 王振营 石艳明 吕炜枫 XU Huibo;WANG Zhenying;SHI Yanming;LV Weifeng(China Nuclear Power Operations Co.,Ltd,Shenzhen,518000,China;China Nuclear Power Engineering Co.,Ltd,Shenzhen,518049,China)

机构地区：[1]中广核核电运营有限公司,广东深圳518000 [2]中广核工程有限公司,广东深圳518049

出　　处：《核电子学与探测技术》2025年第1期116-122,共7页Nuclear Electronics & Detection Technology

摘　　要：核电厂在运行期间,需要对一回路冷却剂放射性水平进行持续监测以探测可能的燃料包壳破损,针对当前核电厂一回路放射性异常监测系统仅使用归一化的一回路稳态放射性阈值导致的对燃料包壳破损状态的误判问题,本文提出一种改进方案,通过引入瞬态阈值、SGTR阈值和MSLB阈值,制定不同运行工况下的一回路放射性异常阈值判据,从而避免MSLB、SGTR或瞬态运行期间因碘峰效应引起的对燃料包壳是否破损的误判,确保相关自动动作的合理响应,为运行人员合理采取处理措施提供重要支持。During the operation of nuclear power plants,it is necessary to continuously monitor primary coolant radioactivity to detect potential fuel clad failure.In order to avoid the misjudgment of fuel clad state induced by arbitrarily using an exclusive normalized steady-state radioactivity threshold at present,an improved primary coolant radioactivity abnormal monitoring system is proposed in this paper.By introducing transient threshold,SGTR threshold and MSLB threshold,criterion of radioactivity abnormal under different operating conditions are separately determined,thus the misjudgment of fuel clad state caused by iodine peak effect during SGTR,MSLB or transient operation can be avoided,and reasonable response of relative automatic actions can be ensured.The new system can help operators effectively estimate fuel clad failure condition and provide important support for reasonable operation measure.

关 键 词：包壳破损 放射性 碘峰 瞬态 源项 

分 类 号：TL37[核科学技术—核技术及应用]