基于泄漏监测数据综合的核电厂反应堆一回路压力边界泄漏诊断技术研究

Comprehensive Leakage Diagnosis Technology of Primary Loop Pressure Boundary of Nuclear Power Plants Based on Leakage Monitoring Data Synthesis

泄漏监测系统用于监测反应堆冷却剂系统压力边界(RCPB)完整性,也是破前漏(LBB)技术应用的先决条件。泄漏综合诊断是泄漏监测系统的核心功能。本文从系统可用性、数据可靠性、单仪表泄漏报警、泄漏综合诊断、报警响应策略、泄漏率定期试验自动计算6个方面构建泄漏综合诊断技术方案。泄漏监测系统的灵敏度和准确性是泄漏综合诊断技术的重要性能指标,也是监测RCPB完整性和LBB技术应用的关键要求。先确定触发单仪表报警的保守阈值范围,以保证检测的灵敏度,再经泄漏综合诊断技术方案复核并调整有效单仪表报警阈值,以保证报警的准确性。通过理论计算、数据分析、多信号的一致性判断,泄漏监测系统能及时准确地诊断出泄漏情况,充分应用智能化泄漏诊断技术,减少运行人员复核报警工作量。

The leakage monitoring system is used to monitor the integrity of the reactor coolant system pressure boundary(RCPB),and is also a prerequisite for the application of leak before break(LBB)technology.Leakage comprehensive diagnosis is the core function of leakage monitoring system.In this paper,the technical scheme of leakage comprehensive diagnosis is constructed from six aspects:system availability,data reliability,single meter leakage alarm,leakage comprehensive diagnosis,alarm response strategy and automatic calculation of leakage rate periodic test.The sensitivity and accuracy of leakage monitoring system are important performance indicators of the comprehensive leakage diagnosis technology,and also the key requirement of the integrity of RCPB and the application of LBB technology.Firstly,the conservative threshold range of triggering single instrument alarm is determined to ensure the sensitivity of detection.Then,the effective single instrument alarm threshold is checked and adjusted by the leakage comprehensive diagnosis technical scheme to ensure the accuracy of the alarm.Through theoretical calculation,data analysis and multi signal consistency judgment,the leakage monitoring system can timely and accurately diagnose the leakage.The intelligent of leakage diagnosis technology is fully applied to reduce the workload of review and alarm of operators.