压水堆核电站安全注入试验期间执行机构拒动和误动的干预对策分析

Analysis of Intervening Measures About Actuators Act-refused and Act-error During Safety Injection Test

安全注入试验是压水堆核电厂热试期间涉及范围最广、风险最高的试验。试验程序要求在热停平台通过快速开启蒸汽排放阀模拟二回路破口触发安注信号,验证反应堆跳闸,安全壳隔离,安注执行机构动作,并对开盖冷试期间调整的安注流量进行再次验证。安注信号一旦触发将导致22个系统共计234个设备真实动作,一回路被注入含硼水。任何在线错误、设备缺陷或操作失误都可能导致试验失败,甚至可能导致一回路设备损坏;同时因安全注入试验将导致核电站主回路产生一次瞬态,对一回路设备冲击极大,所以安全注入试验必须保证一次成功。为了保证试验的真实性及完整性,提高试验的一次成功率,控制试验的风险,本研究针对以往项目执行该试验时存在的一回路水位过高及设备误动或拒动的难题,对试验方案进行了优化创新。该方案成功运用于阳江3号机安全注入试验,一定程度上解决了稳压器水位过高及设备误动、拒动的难题,获得了机组安全可控且试验顺利高效的效果,达到了同行领先水平。

In pressurized water reactor safety injection test covered a wide scope and has the highest risk during HFT（Hot Functional Test）. The purpose of the safety injection system actuation test is to verify actuation of reactor trip signal, actuation of containment isolation, actuation of SI signal and subsequent actions through analogue signal（secondary circuit break） from GCT-a during hot shutdown nominal conditions and to verify Validity of flow adjustments performed during open vessel functional tests. Once actuation of safety injection,there will be 234 Actuators from 22 systems, then boron water will be injected into reactor coolant system. Any fault of online, any defection of equipment or any mistake during operation could lead to failures and result in the damage of equipment. Synchronously, it will make highqmpact to reactor coolant loop, then reactor coolant loop will arise the transient. So Safety injection Test must be succeeded at a time. To ensure the authenticity and integrality of test and improve the possibility of success and control the risk, this passage optimizes the scheme of test through the experience （PZR high level, Actuators act-error and act-refused） from other project. To a certain extent, the conclusion applied in Yangjiang nuclear station settled the problems about PZR high level, Actuators act error and act-refused and ensured the safety of unite and made s the test performed smoothly and kept ahead in nuclear industry.