Many heat exchangers are used in nuclear power plants. In this study, 25 events related to the failure of the body of heat exchangers at nuclear power plants in the United States were selected from the nuclear information database owned by the Institute of Nuclear Safety System, and these events were analyzed in view of the history of occurrence, cause of failure, countermeasures and the other factor. As a result, it was found that the cause of heat exchanger failure was often poor maintenance. Also, among the countermeasures. the number of revisions of procedures and of repairs were seen to be large.%原子力発電所では，多数の熱交換器が使用されている.本分析においては.原子力安全システム研究所の原子力情報データベースに登録されている米国原子力発電所の不具合事象から，熱交換器本体の不具合が扱われている25事象を抽出し，発生数の推移，不具合発生原因別.不具合発生対策別の分類を行った.その結果，熱交換器の不具合は保守不良によるものが多い.また，その対策として，手順書の改訂，補修が多い.
展开▼
