中国先进研究堆一次冷却剂回路密封垫破损事件分析与处理

Analysis and Disposal for Sealing Gasket Breakage Event of Primary Coolant Loop in China Advanced Research Reactor

本文介绍了中国先进研究堆(CARR)一次冷却剂回路密封垫破损事件以及运行人员对事件的处理过程,剖析了事件发生的根本原因即管路法兰原安装的缺陷,分析了事件后果影响,即造成冷却剂泄漏,指出该事件未对工作人员辐射安全造成影响,未对反应堆及关键系统设备造成影响,泄漏水均在厂房内,对环境无影响,反应堆各项参数均未超出技术规格书中规定的运行限值与条件。本文对事件的过程数据与安全分析报告的内容进行了分析比较,针对事件发生的原因以及处理过程中遇到的一些问题,按照纵深防御的原则,分别从密封垫选型更换、增设法兰防护套、增设渗漏信号以及加强控制技术等方面阐述了系统的改进及优化。

The sealing gasket breakage event of primary coolant loop in China Advanced Research Reactor （CARR） and the event processing by operators of CARR were intro-duced in this paper. The reason of the event was original installation defects of pipeline flange, and consequences of this event causing loss of coolant were analyzed. It is shown that this event does not affect the radiation safety of workers and cause any impact on reactor and critical system and equipment. All of leakage water is collected in the plant of reactor, and it does not impact on environment. All parameters do not exceed the limits and conditions specified by safety technical specification. The event process data were analyzed and compared with the content of safety analysis report. For the cause of the event and some problems encountered in the process, according to the defense- in-depth policy, several system improvements and optimizations were elaborated, inclu-ding gasket replacement, adding flange protective kit, adding leakage signal andstrengthening control techniques etc.