Patent ID: 6925418

Claim:
An apparatus for maintaining plant equipment comprising: an input it configured to receive information on targets and ranges of plant equipment to be maintained, that constitute a plant, inspection information and operation-history information; a failure-event tree breakdown unit configured to perform tree-breakdown on failures to be expected from a failure event to be inspected, in order to obtain a failure-event tree; a failure-unreliability function calculation unit configured to calculate unreliability of a resultant event in the failure-event tree with respect to a causal event in the failure-event tree preceding the resultant event; a failure-derived monetary loss calculation unit configured to multiply each unreliability and a cost of recovery from each event and accumulate results of multiplication in accordance with the failure-event tree breakdown, thus obtaining a recovery cost; a preventive-maintenance expense calculation unit configured to calculate preventive maintenance expenses for preventing failure events; and a maintenance decision-making unit configured to decide maintenance timing and technique through comparison between the recovery cost and the preventive maintenance expenses.