사용후핵연료 습식저장시설 사고 안전성 평가 연구 현황 및 사고 사례 분석
Analysis on Study Cases of Safety Assessment and Cases for Spent Nuclear Fuel Pool Accident
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Spent nuclear fuel corresponds to high-level radioactive waste that has high decay heat andradioactivity. Accordingly, Spent nuclear fuel withdrawn from the reactor core is primarily stored andmanaged in a spent nuclear fuel pool in the nuclear power plant to reduce decay heat and radioactivity. In Korea, most nuclear power plant store all spent nuclear fuel in a spent nuclear fuel pool. For wetstorage, there are no defense in depth different with reactor core. The study related to spent nuclear fuelpool accident should be carried out to ensure safety. Therefore, it is necessary to analyze previous studycases related to safety of spent nuclear fuel pool and accident cases to build foundational knowledge. The Objective of this study is to analyze study cases of safety assessment and cases for spent nuclearfuel pool accident. For analyzing study cases of safety assessment, possible phenomena when spentnuclear fuel pool accident occurring identified, Subsequently, study cases for safety assessment abouteach phenomena were investigated, and materials & methods and results for each study are analyzed. For analyzing cases for spent nuclear fuel pool accident, we analyzed accident cases caused by loss ofcooling and loss of coolant in spent nuclear fuel pool. Subsequently, causes and change of water leveland temperature by each accident case are analyzed. As a result of the analysis on study cases of spentnuclear fuel pool accident, the results of the study conducted by each research institute were varydepending on the computer code, materials & methods of experiment and major assumptions used inthe study. As a result of analyzing cases for spent nuclear fuel pool accident, it was found that accidentcases for loss of cooling is more than cases for loss of coolant accident. Even though the types of accidentin spent nuclear fuel pool were similar, the specific causes were different by each accident case. All theaccident cases analyzed did not lead to severe accidents, such as nuclear fuel being exposed to the air. The result of this study will be used as fundamental data for study on spent nuclear fuel pool accident thatwill be conducted in the future.
Abstract
Spent nuclear fuel corresponds to high-level radioactive waste that has high decay heat andradioactivity. Accordingly, Spent nuclear fuel withdrawn from the reactor core is primarily stored andmanaged in a spent nuclear fuel pool in the nuclear power plant to reduce decay heat and radioactivity. In Korea, most nuclear power plant store all spent nuclear fuel in a spent nuclear fuel pool. For wetstorage, there are no defense in depth different with reactor core. The study related to spent nuclear fuelpool accident should be carried out to ensure safety. Therefore, it is necessary to analyze previous studycases related to safety of spent nuclear fuel pool and accident cases to build foundational knowledge. The Objective of this study is to analyze study cases of safety assessment and cases for spent nuclearfuel pool accident. For analyzing study cases of safety assessment, possible phenomena when spentnuclear fuel pool accident occurring identified, Subsequently, study cases for safety assessment abouteach phenomena were investigated, and materials & methods and results for each study are analyzed. For analyzing cases for spent nuclear fuel pool accident, we analyzed accident cases caused by loss ofcooling and loss of coolant in spent nuclear fuel pool. Subsequently, causes and change of water leveland temperature by each accident case are analyzed. As a result of the analysis on study cases of spentnuclear fuel pool accident, the results of the study conducted by each research institute were varydepending on the computer code, materials & methods of experiment and major assumptions used inthe study. As a result of analyzing cases for spent nuclear fuel pool accident, it was found that accidentcases for loss of cooling is more than cases for loss of coolant accident. Even though the types of accidentin spent nuclear fuel pool were similar, the specific causes were different by each accident case. All theaccident cases analyzed did not lead to severe accidents, such as nuclear fuel being exposed to the air. The result of this study will be used as fundamental data for study on spent nuclear fuel pool accident thatwill be conducted in the future.
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