05000336/FIN-2012005-04
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Finding | |
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| Title | Unsealed Penetrations in Flood Barriers May Impact Safety Related Equipment in a Design Basis Flood |
| Description | On October 15, 2012, during walkdowns performed in response to the NRCs 10 CFR 50.54(f) letter while Unit 2 was shutdown in Mode 5, Dominion identified several unsealed electrical conduits connecting the SW pump room in the intake structure to the turbine building. During a design basis flood, this condition had the potential to cause flooding of the turbine building such that all auxiliary feedwater pumps could be rendered inoperable. Dominion has also identified other unsealed penetrations in the design basis flood zone. Dominion took prompt corrective actions to seal the identified penetrations. These deficiencies may have existed since initial construction. The inspectors determined that there was a performance deficiency in that Dominion did not ensure that the electrical conduits were sealed to provide adequate flood protection. Additional information is necessary for the inspectors to determine if the issue is more than minor. The information required is as follows: 1. Determine if the conduits that were not sealed at the Unit 2 flood boundary were sealed on the other end; 2 Determine the aggregate impact of potential flooding from all leak paths on the safety function of affected components. Upon receipt of the above information, the NRC will assess whether the performance deficiency is more than minor. |
| Site: | Millstone  |
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| Report | IR 05000336/2012005 Section 4OA5 |
| Date counted | Dec 31, 2012 (2012Q4) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | M Patel M Modes B Haagensen J Krafty R Mckinley J Nicholson R Rolph S Chaudhary J Ambrosini T Hedigan D Lawyerb Haagensend Orr E Keighley J Ambrosini J Caruso J Deboer J Krafty M Modes R Bellamy R Rolph |
| INPO aspect | |
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Finding - Millstone - IR 05000336/2012005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Millstone) @ 2012Q4
Self-Identified List (Millstone)
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