05000336/FIN-2010003-01
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Finding | |
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| Title | Failure to Properly Identify and Correct a Degraded Governor Condition in the Unit 2 \'A\' EDG |
| Description | A self-revealing, NCV of 1 0 CFR 50, Appendix B, Criterion XVI, Corrective Action, was identified for Dominion\'s failure to properly evaluate a condition adverse to quality involving the Unit 2 \'A\' emergency diesel generator (EDG). Dominion did not properly evaluate a degraded condition of the \'A\' EDG, which led to its inoperability from May 12,2010, to May 17, 2010. Dominion took immediate corrective action to replace the EDG govemor. The inspectors determined this finding was more than minor because it was associated with the Human Performance attribute of the Mitigating Systems cornerstone, and affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, Dominion\'s inadequate evaluation of the degraded condition of the \'A\' EDG governor after the March 17, 2010, surveillance test did not result in effective corrective action to address the cause of the rapid load increase. As a result, the \'A\' EDG was declared inoperable when it again experienced a rapid load increase during its surveillance on May 12, 2010. The inspectors determined the significance of the finding using IMC 0609.04, Phase 1 - Initial Screening and Characterization of Findings, and determined that the finding was of very low safety significance (Green) because it did not represent an actual loss of safety function of a single train for greater than its Technical Specification allowed outage time. The inspectors determined that this finding had a cross-cutting aspect in the Human Performance cross-cutting area, Decision Making component, because Dominion did not use conservative assumptions in its decision making when they could not conclude that the EDG load fluctuations would not recur [H.1 (b )]. |
| Site: | Millstone  |
|---|---|
| Report | IR 05000336/2010003 Section 4OA2 |
| Date counted | Jun 30, 2010 (2010Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | P Kaufman D Jackson B Haagensen C Bickett J Krafty S Shaffer D Dodson J Rady T Moslak J Richmond |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Millstone - IR 05000336/2010003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Millstone) @ 2010Q2
Self-Identified List (Millstone)
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