국내 원자력발전소의 공기 압축기실에서 윤활유 화재의 위험성 분석을 위한 FDS의 활용

Abstract

The standard procedure of fire modeling was reviewed to minimize the user dependence, based on the NUREG-1934 and 1824 reports. The hazard analysis of lubricating oil fires in the air compressor room of domestic nuclear power plant (NPP) was also performed using a representative fire model, FDS (Fire Dynamics Simulator). The area (<TEX>$A_f$</TEX>) and location of fire source were considered as major parameters for the realistic fire scenarios. As a result, the maximum probability to exceed the thermal damage criteria of IEEE-383 unqualified electrical cables was predicted as approximately 70% with <TEX>$A_f=1m^2$</TEX>. It was also found that for qualified electrical cables, the maximum probabilities of exceeding the criteria were 2% and 90% with <TEX>$A_f=2$</TEX> and <TEX>$4m^2$</TEX>, respectively. It was concluded that all electrical cables should be replaced with IEEE-383 qualified cables and the dike to restrict as <TEX>$A_f{\leq}2m^2$</TEX> should be installed at the same time, in order to assure the thermal stability of electrical cables for lubricating oil fires in the air compressor room of domestic NPP.