Cable Functional Failure Time Evaluation for a Main Control Room Fire using Fire Dynamic Simulator

Abstract

Serious electrical problems, such as shorts, ground faults, or circuits, often cause fire events in the fire proof zone of nuclear power plants. These would be directed to the loss of safe shutdown capabilities performed by safety-related systems and equipment. The fire event can be treated with the basic design principle that safety systems should maintain their functions with redundancy and independency. In the case of a cable fire in the main control room, operators cannot perform their mission properly and can misjudge the situation because of spurious operation, incorrect indication or instrument. These would deteriorate the plant capabilities of safety shutdown and result in disastrous conditions. Therefore, during a main control room fire, 5 minutes of operator action time is very important to operate the safety shutdown components. This paper describes the cable functional failure temperature criteria and conducted a cable functional failure time evaluation using Fire Dynamic Simulator to obtain the operator action time for a main control room fire.

Experimental Study on the Toxicity Characteristics of Non-Class 1E Cables according to Accelerated Deterioration

“…통계청에서 (9) . 또한, 원자력발전소의 운전 수명을 안전하게 연장시키기 위해서는 원전 주요 기기구조 및 계통의 열화관리가 필요 한 실정 (10)(11)(12) 이며, 특히 케이블은 원전가동 중 교체가 어려 워 열화관리가 더욱 중요시 된다. 그럼에도 불구하고, 국내 에는 케이블의 내용연수에 대한 연소 배출가스의 독성에 대한 명확한 기준이 마련되어있지 않기 때문에 (4) , 본 연구 를 통하여 케이블의 열화정도에 따른 화재시 발생하는 가 스의 독성을 파악하고, 기술기준을 제시할 수 있는 시험데 이터를 도출하고자 한다.…”