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Level 3 Probabilistic Safety Assessment (PSA) is performed for the risk assessment that calculates radioactive material dispersion to the environment. This risk assessment is performed with a tool of MELCOR Accident Consequence Code System (MACCS2 or WinMACCS). For the off-site consequence analysis of multi-unit nuclear power plant (NPP) accident, the single location (Center Of Mass, COM) method has been usually adopted with the assumption that all the NPPs in the nuclear site are located at the same COM point. It was well known that this COM calculation can lead to underestimated or overestimated radionuclide concentration. In order to overcome this underestimation or overestimation of radionuclide concentrations in the COM method, Multiple Location (ML) method was developed in this study. The radionuclide concentrations for the individual NPPs are separately calculated, and they are summed at every location in the nuclear site by the post-processing of radionuclide concentrations that is based on two-dimensional Gaussian Plume equations. In order to demonstrate the efficiency of the ML method, radionuclide concentrations were calculated for the six-unit NPP site, radionuclide concentrations of the ML method were compared with those by COM method. This comparison was performed for conditions of constant weather, yearly weather in Korea, and four seasons, and the results were discussed. This new ML method (1) improves accuracy of radionuclide concentrations when multi-unit NPP accident occurs, (2) calculates realistic atmospheric dispersion of radionuclides under various weather conditions, and finally (3) supports off-site emergency plan optimization. It is recommended that this new method be applied to the risk assessment of multi-unit NPP accident. This new method drastically improves the accuracy of radionuclide concentrations at the locations adjacent to or very close to NPPs. This ML method has a great strength over the COM method when people live near nuclear site, since it provides accurate radionuclide concentrations or radiation doses.
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참고문헌 (12)
참고문헌 신청
전호준 / 2012 / 원자력발전소 비상전력계통 강화 방안에 따른 리스크 영향 평가 / 한국안전학회지 27(5):224~228
전호준 / 2011 / MACCS II 코드를 이용한 국내 경수로 및 중수로형 원전의 소외결말분석 / 한국안전학회지 26(5):105~109
T. Hakata / 2007 / Seismic PSA Method for Multiple Nuclear Power Plants in a Site / Reliability Engineering and System Safety 92:883~894
M. Modarres / 2017 / Advances in Multi-unit Nuclear Power Plant Probabilistic Risk Assessment / Reliability Engineering and System Safety 157:87~100
S. Schroer / 2013 / An Event Classification Schema for Evaluating Site Risk in a Multi-unit Nuclear Power Plant Probabilistic Risk Assessment / Reliability Engineering and System Safety 117:40~51
전호준 / 2011 / MACCS II 코드를 이용한 국내 경수로 및 중수로형 원전의 소외결말분석 / 한국안전학회지 26(5):105~109
T. Hakata / 2007 / Seismic PSA Method for Multiple Nuclear Power Plants in a Site / Reliability Engineering and System Safety 92:883~894
M. Modarres / 2017 / Advances in Multi-unit Nuclear Power Plant Probabilistic Risk Assessment / Reliability Engineering and System Safety 157:87~100
S. Schroer / 2013 / An Event Classification Schema for Evaluating Site Risk in a Multi-unit Nuclear Power Plant Probabilistic Risk Assessment / Reliability Engineering and System Safety 117:40~51
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