05000271/FIN-2010002-02
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Finding | |
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| Title | Emergency Diesel Generator Surveillance Testing Not Risk Assessed in Accordance with 10 CFR 50.65 (a)(4) |
| Description | The inspectors identified an NCV of very low safety significance (Green) of 10 CFR 50.65, Requirements for Monitoring the Effectiveness of Maintenance at Nuclear Power Plants, because Entergy staff did not assess and manage the increase in risk due to surveillance testing activities that impacted the availability of the \'A\' emergency diesel generator (EDG) in accordance with 10 CFR 50.65 (a)(4). Entergy initiated CR-VTY-201 0-01 019 to address the issue, issued a standing order to ensure the EDGs are properly considered unavailable during future surveillance tests, and commenced an extent of condition review to determine the staff\'s effectiveness at properly accounting for unavailability in accordance with 10 CFR 50.65 (a)(4) for the EDGs and other risk significant systems. This finding is more than minor because it affected the equipment performance attribute of the Mitigating Systems cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). Specifically, the availability of the \'A\' EDG was affected and Entergy\'s risk assessment did not consider risk significant structures, systems and components (SSCs) (i.e., EDGs) that were unavailable during the maintenance activity and did not take risk management actions. The inspectors determined the significance of the finding using IMC 0609 Appendix K, Maintenance Risk Assessment and Risk Management Significance Determination Process. The finding was determined to be of very low safety significance (Green) because the incremental core damage probability deficit for the time the \'A\' EDG \\ was unavailable was less than 1.0E-6. The inspectors determined this finding had a cross-cutting aspect in the area of human performance within the work control component because Entergy did not appropriately plan and incorporate risk insights in work activities that impacted the availability of the \'A\' EDG. (H.3(a)) |
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
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| Report | IR 05000271/2010002 Section 1R13 |
| Date counted | Mar 31, 2010 (2010Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.13 |
| Inspectors (proximate) | D Jackson S Rutenkroger H Jones D Spindler |
| CCA | H.5, Work Management |
| INPO aspect | WP.1 |
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Finding - Vermont Yankee - IR 05000271/2010002 | |||||||||||||||||||||||||||||||||
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Finding List (Vermont Yankee) @ 2010Q1
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