MAINTENANCE IMPORTANCE DETERMINATION SYSTEM, MAINTENANCE IMPORTANCE DETERMINATION METHOD, AND MAINTENANCE IMPORTANCE DETERMINATION PROGRAM

To provide a maintenance importance determination system capable of identifying a device that has a large impact on safety or economic efficiency when function decreases or is lost.SOLUTION: A maintenance importance determination system 1 includes: a storage unit 57 that stores an influence table 22 indicating the degree of influence of each system function achieved by a series of a device on a nuclear power plant, and an element function table 25 indicating the degree of necessity of the element function in which system function is decomposed; an element function identification part 13 that identifies an important element function using the degree of necessity of the element function and the degree of influence of the system function to which the element function belongs; and a device identification unit 14 that identifies a device necessary to achieve the important element function identified by the element function identification unit 13.SELECTED DRAWING: Figure 1 【課題】機能の低下時又は喪失時に、安全性又は経済性へ与える影響の大きい機器を特定する。【解決手段】保全重要度判定システム１は、一連の機器で達成される各系統機能の原子力発電プラントへの影響度を示す影響度テーブル２２、及び、系統機能が分解された要素機能の必要度を示す要素機能テーブル２５を格納した記憶部５７と、要素機能の必要度、及び、要素機能が属する系統機能の影響度を用いて、重要な要素機能を特定する要素機能特定部１３と、要素機能特定部１３が特定した重要な要素機能の達成に必要な機器を特定する機器特定部１４とを備える。【選択図】図１