压水堆核电厂安全壳内碎片源的踏勘方法介绍

The Introduction on Debris Source Walkdowns inside PWR NPP Containments

安全壳地坑是许多压水堆核电厂设计为在失水事故后为堆芯冷却和安全壳排热提供再循环水的专设安全设施。安全壳内的潜在碎片源在事故中可能堵塞安全壳内的地坑滤网,从而造成安全壳地坑性能下降。为了评价安全壳地坑在破口事故后能否满足设计要求,首先应确定潜在碎片源的类型以及它们在安全壳内的位置。安全壳内现场踏勘就是寻找与定位碎片源的有效方法,并能够提供一些进行安全壳地坑性能分析的必要信息。介绍了压水堆核电厂安全壳内碎片源的一些踏勘方法。

Containment sump is the Engineered Safety Features for providing recirculation coolant for core cooling and containment heat removal in the design of PWR NPP after loss of coolant accident. The potential debris inside the containment can result in clogging the containment sump strainer, and the sump performance will degrade. To evaluate whether the sump could satisfy the design requirements following a loss of coolant accident, the debris type and location should be identified. Debris source walkdowns inside containment is an effective method to search and locate the debris and provides some necessary information for containment sump performance analysis. This paper introduced some guidance for debris source walkdowns inside PWR NPP containment.