05000336/FIN-2010005-01
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Finding | |
|---|---|
| Title | Failure to Provide an Adequate Procedure for Backwashing Condenser Water Boxes |
| Description | A self-revealing finding (FIN) of very low significance was identified for Dominion\'s failure to provide an adequate procedure for backwashing the Unit 2 condenser water boxes in accordance with procedure MP-05-MMM, Manuals, Procedures, Guidelines, Handbooks and Forms. Specifically, in implementing the procedure, the A circulating water (CW) pump automatically ramped down to zero speed shortly after securing the B CW pump. This resulted in a loss of condenser vacuum, which caused an automatic turbine trip. The turbine trip caused an automatic reactor trip. Dominion entered the issue into their corrective action program (CAP) and revised the operating procedure (OP) 2325D. The finding is more than minor because it was similar to NRC Inspection Manual Chapter 0612, Appendix E, Examples of Minor Issues, Example 4b, in that an inadequate procedure led to a reactor trip. The finding was associated with the Procedure Quality 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. Specifically, Dominion\'s failure to provide an adequate procedure for backwashing Unit 2 condenser water boxes resulted in the variable frequency drive (VFD) logic securing the only CW pump running in that condenser, and subsequently caused a reactor trip. The finding was of very low safety significance (Green) because it did not contribute to both the likelihood of a reactor trip and the likelihood that mitigation equipment or functions would not be available. The inspectors determined that this finding had a cross-cutting aspect in the Human Performance cross-cutting area, Resources component, because Dominion did not provide an accurate and up-tO-date procedure for the backwashing of the Unit 2 water boxes. |
| Site: | Millstone  |
|---|---|
| Report | IR 05000336/2010005 Section 4OA3 |
| Date counted | Dec 31, 2010 (2010Q4) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | T Moslak J Caruso D Jackson S Pindale B Haagensen B Welling P Presby J Krafty S Shaffer J Johnson |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Millstone - IR 05000336/2010005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Millstone) @ 2010Q4
Self-Identified List (Millstone)
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