05000336/FIN-2007002-01: Difference between revisions
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| identified by = NRC | | identified by = NRC | ||
| Inspection procedure = IP 71111.12 | | Inspection procedure = IP 71111.12 | ||
| Inspector = S Schneider, B Norris, R Fernandes, J Commiskey, T Moslak, J Richmond, A Defrancisco, R Treadway, K Mangan, G Johnson, J Benjamin, D Johnsons, | | Inspector = S Schneider, B Norris, R Fernandes, J Commiskey, T Moslak, J Richmond, A Defrancisco, R Treadway, K Mangan, G Johnson, J Benjamin, D Johnsons, Ngl Cheung, T Moslak, K Diederich, J Benjamin, D Johnson, S Schneider, W Raymond, R Fernandes | ||
| CCA = N/A for ROP | | CCA = N/A for ROP | ||
| INPO aspect = | | INPO aspect = | ||
| description = The inspectors reviewed Dominions MR (a)(1) evaluation for the vital switchgear cooling system following the determination that two air conditioners (A/C-3 B51, and A/C-4 B61) had insufficient refrigerant charge as documented in CR-06-01138, dated November 21, 2006. The evaluation concluded that there was no functional failure because, in accordance with MP-24-MR-FAP710, Maintenance Rule Functional Failures and Evaluations, the failures were considered design deficiencies that could not have been prevented by post-modification testing or predictive maintenance. The inspectors reviewed Dominions MR procedure, CRs, and work orders applicable to the maintenance on the switchgear cooling system. In order to fully understand whether prior opportunities existed to prevent the A/C unit failures, the inspectors will conduct additional interviews and investigation into the maintenance rule and design control processes. As such, this issue remains an unresolved item (URI) pending further NRC investigation into prior A/C unit maintenance practices and review of Dominions maintenance rule and design control processes for these A/C units. (URI 05000336/2007002-01, Maintenance Rule (a)(1) Evaluation of Unit 2 Vital Switchgear Emergency Cooling Failure). | | description = The inspectors reviewed Dominions MR (a)(1) evaluation for the vital switchgear cooling system following the determination that two air conditioners (A/C-3 B51, and A/C-4 B61) had insufficient refrigerant charge as documented in CR-06-01138, dated November 21, 2006. The evaluation concluded that there was no functional failure because, in accordance with MP-24-MR-FAP710, Maintenance Rule Functional Failures and Evaluations, the failures were considered design deficiencies that could not have been prevented by post-modification testing or predictive maintenance. The inspectors reviewed Dominions MR procedure, CRs, and work orders applicable to the maintenance on the switchgear cooling system. In order to fully understand whether prior opportunities existed to prevent the A/C unit failures, the inspectors will conduct additional interviews and investigation into the maintenance rule and design control processes. As such, this issue remains an unresolved item (URI) pending further NRC investigation into prior A/C unit maintenance practices and review of Dominions maintenance rule and design control processes for these A/C units. (URI 05000336/2007002-01, Maintenance Rule (a)(1) Evaluation of Unit 2 Vital Switchgear Emergency Cooling Failure). | ||
}} | }} | ||
Latest revision as of 20:32, 20 February 2018
| Site: | Millstone  |
|---|---|
| Report | IR 05000336/2007002 Section 1R12 |
| Date counted | Mar 31, 2007 (2007Q1) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.12 |
| Inspectors (proximate) | S Schneider B Norris R Fernandes J Commiskey T Moslak J Richmond A Defrancisco R Treadway K Mangan G Johnson J Benjamin D Johnsons Ngl Cheung T Moslak K Diederich J Benjamin D Johnson S Schneider W Raymond R Fernandes |
| INPO aspect | |
| ' | |