05000336/FIN-2009005-02
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Finding | |
|---|---|
| Title | Implementation of Design Change Results in an Unplanned Shutdown of Reactor |
| Description | A self-revealing, Green finding (FIN) was identified for Dominion\'s failure to take Adequate precautions and adequately schedule maintenance on a Unit 2 motor-operated disconnect (MOD) associated with the main transformer. The maintenance on the MOD disrupted a switch connection and caused increasing conductor temperatures, which forced Dominion to perform an unplanned shutdown of the Unit 2 reactor. Dominion has taken corrective action to modify the appropriate procedures and has entered this issue into their corrective action program (CR 351109).This finding was more than minor because it was associated with the Equipment Performance attribute of the Initiating Events cornerstone, and affected the cornerstone objective of limiting the likelihood of those events that upset plant stability and challenge critical safety functions during power operations. The inspectors performed a Phase 1screening in accordance with NRC Inspection Manual Chapter (IMC) Attachment0609.04, Phase 1 - Initial Screening and Characterization of Findings. The inspectors determined the finding was of very low safety significance (Green) because it did not contribute to the likelihood that mitigation equipment or functions would not be available. Enforcement action did not apply because the performance deficiency did not involve a violation of a regulatory requirement. Because this finding did not involve a violation of regulatory requirements, and has very Ipw safety significance (Green), it has been identified as a finding (FIN). This finding had a cross-cutting aspect in the Human Performance cross-cutting area, Work Control component, because Dominion did not appropriately incorporate risk insights and work scheduling of activities consistent with nuclear safety. H.3(a |
| Site: | Millstone  |
|---|---|
| Report | IR 05000336/2009005 Section 1R20 |
| Date counted | Dec 31, 2009 (2009Q4) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.2 |
| Inspectors (proximate) | T Moslak D Silk G Johnson D Jackson M Modes B Haagensen J Krafty S Shaffer |
| CCA | H.5, Work Management |
| INPO aspect | WP.1 |
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Finding - Millstone - IR 05000336/2009005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Millstone) @ 2009Q4
Self-Identified List (Millstone)
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