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임혁순,배연경,지문구 한국화재소방학회 2012 한국화재소방학회논문지 Vol.26 No.1
The fire event occurred in fire proof zone often causes serious electrical problems such as shorts,ground faults, or open circuits in nuclear power plants. These would be directed to the loss of safe shutdown capabilities performed by safety related systems and equipments. The fire event can treat the basic design principle that safety systems should keep their functions with redundancy and independency. In case of a cable fire, operators can not perform their mission properly and can misjudge the situation because of spurious operation, wrong indication or instrument. These would deteriorate the plant capabilities of safety shutdown and make disastrous conditions. In this paper, investigation and cause analysis of cable fire in Nuclear Power Plant, we described the cable fire temperature and functional failure criteria and the cable functional failure temperature evaluation by exposed fire is studied. 원전 방화지역에서 화재가 발생할 경우 안전정지 케이블은 단락, 접지, 단선 등 전기적 고장으로 케이블에 고장이 발생하여 그 결과로 안전정지계통의 설비와 기기는 안전정지 기능을 상실할 수 있다. 따라서원자력 발전소 안전정지계통의 설비와 기능은 다중설계, 계열간 독립 및 분리 원칙에 따라 운영되고 있다. 케이블 화재의 경우 기기 오동작과 오지시 또는 잘못된 계측을 유발할 수 있으며 운전원의 상황 판단에오류를 일으켜 안전정지 기능을 저해할 수 있다. 본 논문에서는 원자력발전소 케이블 화재 조사 및 원인분석, 케이블 화재온도 및 기능상실 기준 및 국내 원자력발전소에서 사용중인 케이블을 선정하여 노출 화재 시 케이블 기능상실 온도를 분석하여 케이블 안전성을 확인하였다.
임혁순,송태영,최문구,김성래 한국원자력학회 2014 Nuclear Engineering and Technology Vol.46 No.1
A total loss of all heat sinks is considered a severe accident with a low probability of occurrence. Following a total lossof all heat sinks, the degasser/condenser relief valves (DCRV) become the sole means available for the depressurization ofthe primary heat transport system. If a nuclear power plant has a total loss of heat sinks accident, high-temperature steam anddifferential pressure between the primary heat transport system (PHTS) and the steam generator (SG) secondary side cancause a SG tube creep rupture. To protect the PHTS during a total loss of all heat sinks accident, a sufficient depressurizationcapability of the degasser/condenser relief valve and the SG tube integrity is very important. Therefore, an accurateestimation of the discharge through these valves is necessary to assess the impact of the PHTS overprotection and the SGtube integrity of the primary circuit. This paper describes the analysis of DCRV discharge capacity and the SG tube integrityunder a total loss of all heat sink using the CATHENA code. It was found that the DCRV's discharge capacity is enough toprotect the overpressure in the PHTS, and the SG tube integrity is maintained in a total loss of all heat accident.