Effect of the HVAC Conditions on the Smoke Ventilation Performance and Habitability for a Main Control Room Fire in Nuclear Power Plant

Abstract

This study evaluated the habitability of operators for main control room fires in nuclear power plants. Fire modeling (FDS v.6.0) was utilized for a fire safety assessment so that it could determine the performance of the smoke ventilation and operator habitability with the main control room. For this study, it categorized fire scenarios into three cases depending on the conditions in the HVAC system. As a result of fire modelling, it showed that Case 1 (with HVAC) would give rise to the worst situation associated with the absolute temperature, radiative heat flux, optical density, and smoke layer height as deliberating the habitability and smoke ventilation. On the other hand, it showed that Cases 2 (w/o HVAC) and 3 can maintain much safer situations than Case 1. In the case of temperature at 820 s, Cases 2 and 3 were up to approximately 63% greater than Case 1 in the wake of ignition. In addition, the influence of radiative heat flux of Case 1 was even larger than Cases 2 and 3. That is, the radiative heat fluxes of Cases 2 and 3 were approximately 68% higher than Case 1. Furthermore, when it comes to considering the optical density, Case 1 was approximately 93% greater than Cases 2 and 3. Accordingly, it expected that the HVAC system can influence a the performance on the smoke ventilation that can be sustainable for operator habitability. On the other hand, it revealed an inconsecutive pattern for the smoke layer height of Cases 2 and 3 because supply vents and exhaust vents were installed within the same surface.

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.…”