05000336/FIN-2008002-02
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Finding | |
|---|---|
| Title | Failure to Identify Unacceptable Unit 2 Charging Pump Surveillance Test Data (Section 1R22) |
| Description | Green. The inspectors identified a non-cited violation (NCV) of 10 CFR 50, Appendix B, Criterion XI, Test Control, for Dominions failure to adequately evaluate surveillance test results to ensure test acceptance criteria had been met on June 20, 2007. Specifically, the inspectors identified that the A charging pump pulsation dampener surveillance test had incorrect data (i.e., testing duration time) and had been accepted as satisfactorily complete, although the test data was outside the surveillance acceptance criteria. The test, in part, demonstrated that nitrogen gas from a failed charging pump discharge dampener would not migrate into the common suction line prior to the credited operator action to shut the pumps suction valve. A subsequent review determined the surveillance test data was incorrect and the A charging pump was operable. Dominions corrective actions for this issue included briefings to provide additional coaching and heighten awareness to the Unit 2 operations shift crews, a review of actual surveillance computer data and review of subsequent surveillances to ensure system operability, and the creation of a trend condition report including other related human performance errors (CR-08-03220). This finding was more than minor because it was associated with the human performance attribute of the Mitigating Systems cornerstone and affected the cornerstone objective of ensuring the availability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). Specifically, the failure to identify out of specification data could result in the failure to identify inoperable equipment. The inspectors also concluded that if the failure to properly evaluate charging pump discharge dampener test data was not corrected, a more significant concern could exist (i.e. common mode failure of charging). The finding was determined to be of very low significance (Green), because it was a deficiency confirmed not to result in loss of safety function. The performance deficiency had a cross-cutting aspect in the area of Problem Identification and Resolution, Corrective Action Program component, because Dominion did not identify out of specification test data P.1(a). (Section 1R22 |
| Site: | Millstone  |
|---|---|
| Report | IR 05000336/2008002 Section 1R22 |
| Date counted | Mar 31, 2008 (2008Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.22 |
| Inspectors (proximate) | L Scholl B Haagensen J Benjamin J Krafty R Powell S Shaffer J Ayala C Sanders |
| CCA | P.1, Identification |
| INPO aspect | PI.1 |
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Finding - Millstone - IR 05000336/2008002 | |||||||||||||||||||||||||||||||||
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Finding List (Millstone) @ 2008Q1
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