05000336/FIN-2010004-04
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Finding | |
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Title | Licensee-Identified Violation |
Description | 10 CFR 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, requires, in part, that activities affecting quality shall be prescribed by documented instructions, procedures, or drawings, of a type appropriate to the circumstances and shall be accomplished in accordance with these instructions, procedures, or drawings. Contrary to this, Dominion had no documented procedure for bypassing undervoltage protection for the vital buses. As a result, on October 7, 2009, Dominion bypassed the undervoltage protection for the vital buses and rendered both EDGs inoperable for approximately seven hours. Upon discovery, Dominion restored the undervoltage protection and entered the issue into their corrective action program (CR351389). The finding is of very low safety significance because of the short duration of the inoperability, and because both EDGs could be manually started from the Control Room. |
Site: | Millstone ![]() |
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Report | IR 05000336/2010004 Section 4OA7 |
Date counted | Sep 30, 2010 (2010Q3) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | Licensee-identified |
Inspection Procedure: | |
Inspectors (proximate) | T Moslak D Jackson B Haagensen J Krafty S Shaffer M Balazik L Kauffman K Modes |
INPO aspect | |
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Finding - Millstone - IR 05000336/2010004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Millstone) @ 2010Q3
Self-Identified List (Millstone)
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