原子力発電所では，多数のポンプが複数の場所で使用されている.ポンプは，正常に動作させるために，主軸，軸受，軸継手等多数の機械品が組み合わされて構成されていることから，個々の部品の信頼性維持がポンプ全体の信頼性維持に直結することとなる.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不具合事象から，ポンプ本体の不具合が扱われている28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，米国ではポンプの不具合は保守不良が多いことが判明した，また対策として，手順書の改訂，部品取替，補修が多く，設計変更が少ないことを確認した.%Many pumps are used in nuclear power plants, and they are used in some place. To run normally, since maintaining each components' reliability is directly connected to pumps' reliability, they are constructed by many mechanical components such as main shaft, shaft bearing, shaft coupling, and so on. In this study, 28 events related to the failure of the body of pumps at nuclear power plants in the United States are selected from the nuclear information database owned by the Institute of Nuclear Safety System, and these events are analyzed in view of the history of occurrence, cause of failure and countermeasures and so on. As a result, it was found that the causes of pumps failure were often poor maintenance. Also among the countermeasures, revision of procedures, replacement parts and fraction of repair was large, and that of design changes was small.
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