The diesel generator of HANARO provides Class III (standby) power during the loss of Class IV (off site) power events, for the important reactor system equipment such as the emergency water supply system, emergency ventilation system, etc. The HANARO has been stabilizing its operation since 1995, so the diesel generator failure data from 1995 to the end of 2002 has been collected. This study shows the failure-to-start probabilities and the failure-to-run probabilities of diesel generator within the 90% confidence bounds. A comparison with the NUREG and AECL studies is shown in this paper.

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