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SMART-ITL을 활용한 일체형원자로 정상정지운전 시험
양진화(Jin-Hwa Yang),배황(Hwang Bae),류성욱(Sung Uk Ryu),전병국(Byong-Guk Jeon),윤은구(Eunkoo Yun),방윤곤(Yun-Gon Bang),서찬종(Chan-Jong Seo),이성재(Sung-Jae Yi),박현식(Hyun-Sik Park) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
A normal shutdown operation test related to commercial operation of SMART is essential to ensure cooling performance of its secondary system. The cooling rates should be under 40 ℃/hr because abrupt cool-down induces Return-to-Power (RTP) condition of reactor. The normal shutdown operation is classified into two types based on which cooling sources are used: 1) secondary feedwater for cooling of the reactor coolant system to the safety shutdown temperature, and 2) Component Cooling Water System (CCWS) for cooling of the reactor coolant system after reaching safety shutdown condition. In the normal shutdown operation with SMART-ITL, the cooling operation of the reactor coolant system using secondary feedwater was partially simulated. Conservatively, a Chemical and Volume Control System (CVCS) operation due to water level decease of the reactor coolant system during normal shutdown operation was not automatic, so intervention of operator was needed. The averaged cooling rates were about 20.5-22.0 ℃/hr and it was sufficient to limit its cooling rate under the target value.