05000275/FIN-2014005-03
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Finding | |
|---|---|
| Title | Failure to Effectively Implement Risk Management Actions Associated with Safety-Related Emergency Diesel Generators |
| Description | The inspectors identified a self-revealing non-cited violation of 10 CFR 50.65(a)(4) for failing to manage risk when a protected train emergency diesel generator was unexpectedly rendered inoperable while another train was being returned to service. Specifically, the installed and administrative operational barriers failed to prevent a loss of safety function to an operable emergency diesel generator resulting in two inoperable emergency diesel generators for a period of two hours. The licensee took immediate actions to adequately implement the physical and administrative operational barriers, repair the damage to the protected emergency diesel generator, and entered the condition into the corrective action program as Notification 50600810. The inspectors determined that the licensees failure to adequately implement risk management actions associated with maintenance on emergency diesel generator EDG 1-2 was a performance deficiency. The performance deficiency was more than minor and therefore a finding because it was associated with the configuration control attribute of the Mitigating Systems cornerstone and adversely affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The inspectors determined the performance deficiency involved the licensees assessment and management of risk associated with performing maintenance in accordance with 10 CFR 50.65(a)(4). The inspectors reviewed the results of Calculation RA 13-11, Evaluation for Unit 1, EDG 1-3 Inoperable while EDG 1-2 is in Maintenance, Revision 0, for impact to incremental core damage probability. Th
inspectors used Inspection Manual Chapter 0609, Attachment 04, Initial Characterization o Findings, and Appendix K, Maintenance Risk Assessment and Risk Management Significance Determination Process, and determined because the incremental core damage probability deficit (ICDPD) was not greater than 1E -06/year, the finding was determined to be of very low safety significance (Green). The finding was determined to have a cross-cutting aspect in the area of human performance, associated with the work practices component, in that personnel work practices are used commensurate with the risk of the assigned task, such that work activities are performed safely. Specifically, the operator did not consider potential undesired consequences, such as damage to the fuel line, and perform adequate self or peer checks prior to performance of an inspection of protected equipment to ensure risk managemen action would provide appropriate protection [H.11]. |
| Site: | Diablo Canyon  |
|---|---|
| Report | IR 05000275/2014005 Section 4OA3 |
| Date counted | Dec 31, 2014 (2014Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | I Anchondo J O'Donnell J Reynoso L Ricketson P Kaufman P Nizov T Hipschman W Walker C Smith |
| Violation of: | 10 CFR 50.65(a)(4) 10 CFR 50.65 |
| CCA | H.11, Challenge the Unknown |
| INPO aspect | QA.2 |
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Finding - Diablo Canyon - IR 05000275/2014005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Diablo Canyon) @ 2014Q4
Self-Identified List (Diablo Canyon)
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