05000275/FIN-2012008-01
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Finding | |
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Title | Failure to Maintain Required Firewater System Configuration |
Description | The team reviewed a self-revealing non-cited violation of License Conditions 2.C(4) for Unit 1 and 2.C(5) for Unit 2, Fire Protection Program, due to the licensee inadvertently isolating the firewater yard loop for approximately three days, reducing the plants fire protection capability without compensatory actions. The licensee entered this issue in their corrective action program as Notification 50513006. The failure to maintain the fire water system configuration as required in the approved fire protection program was a performance deficiency. The performance deficiency was more than minor because it was associated with the protection against external events (fire) attribute of the Mitigating Systems Cornerstone and it adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The performance deficiency affected the fire protection defense-in depth strategies involving post-fire safe shutdown systems. The major fire loading in the yard area resulted from the 12 large transformers. The senior reactor analyst made the bounding assumption that any transformer fire without suppression would result in an unrecoverable loss of offsite power. A bounding value was calculated by multiplying the fire ignition frequency by the conditional core damage probability. This resulted in a change to core damage frequency of 1.2 x 10-7. Therefore, the subject finding was of very low safety significance (Green). This performance deficiency had a cross-cutting aspect in the area of resources associated with providing complete, accurate and up-to-date design documentation, procedures, and work packages, and correct labeling of components. Specifically, the licensee did not provide sufficient details in procedures for operators to successfully align an infrequently operated valve with no position indication. |
Site: | Diablo Canyon ![]() |
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Report | IR 05000275/2012008 Section 1R05 |
Date counted | Dec 31, 2012 (2012Q4) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | Self-revealing |
Inspection Procedure: | IP 71111.05 |
Inspectors (proximate) | S Alferink J Mateychick B Correll N Okonkwo G Miller |
CCA | H.7, Documentation |
INPO aspect | WP.3 |
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Finding - Diablo Canyon - IR 05000275/2012008 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Diablo Canyon) @ 2012Q4
Self-Identified List (Diablo Canyon)
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