核电厂安全壳地坑滤网堵塞问题的纠正措施研究

Corrective Actions Study on Issues of Containment Sump Strainer Clogging of NPP

核电厂发生破口失水事故后,当应急堆芯冷却系统或安全壳喷淋系统处于再循环模式运行时,碎片堵塞对安全壳地坑滤网的性能存在着潜在的影响,而且碎片迁移过程中的堵塞可能会对再循环模式需要的流道造成不利的影响。本文将从碎片产生、碎片输运和地坑滤网设计等方面,论述说明针对地坑滤网堵塞问题可能采取的纠正措施。

There is potential susceptibility to debris blockage for recirculation sump strainer in the event of a loss-of-coolant accident when emergency core cooling system （ECCS） or containment spray system （CSS） operates in recirculation mode, and there are additional adverse effects due to debris blockage of flow paths necessary for ECCS and CSS recirculation. Corrective actions should be taken to resolve the strainer clogging issue in order to ensure successful recirculation operation of ECCS and CSS. This paper will provide corrective actions, which are probably taken on the issue of containment sump strainer clogging, from debris generation, debris transport, and the design of sump strainer.