05000423/FIN-2013005-03
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Finding | |
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| Title | |
| Description | The inspectors identified a Green Finding (FIN) for the failure to follow Dominion Procedure OP-AA-102, Operability Determinations, and establish adequate compensatory measures to restore reliability to the Unit 3 Turbine Driven Auxiliary Feedwater (TDAFW) Pump following overspeed trips on November 4 and December 18, 2013. The inspectors determined that the performance deficiency was within Dominions ability to foresee and correct. Dominion entered this issue into their corrective action program (CAP) (CR531536, CR532536 and CR535411), established additional compensatory measures to address degraded pump reliability, and scheduled additional maintenance activities to more thoroughly investigate the cause of the overspeed trips. The inspectors determined the performance deficiency was more than minor because it affected the equipment performance attribute of the mitigating systems cornerstone to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Failure to adequately establish effective compensatory measures resulted in a decrease in the reliability of the auxiliary feedwater (AFW) system to mitigate events. The inspectors determined that, after further compensatory measures were established, the TDAFW pump maintained its operability, the AFW system maintained all safety functions, and the finding was of very low safety significance (Green). This finding has a cross-cutting aspect in the area of human performance, in that Dominion did not use conservative assumptions in decision making and did not adopt a requirement to demonstrate that the proposed action is safe in order to proceed rather than a requirement to demonstrate that it is unsafe in order to disapprove the action. |
| Site: | Millstone  |
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| Report | IR 05000423/2013005 Section 1R15 |
| Date counted | Dec 31, 2013 (2013Q4) |
| Type: | Finding: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | J Richmond P Presby R Mckinley R Rolph S Barr B Haagensen D Silk J Ambrosini J D'Antonio J Krafty |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Millstone - IR 05000423/2013005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Millstone) @ 2013Q4
Self-Identified List (Millstone)
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