Finding | |
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| Title | Inadequate Risk Assessment for Isolating the Condensate Pumps\' Minimum Flow Line\'S Automatic Flow Control Valve |
| Description | The inspectors identified an NCV of 10 CFR 50.65, Requirements for Monitoring the Effectiveness of Maintenance at Nuclear Power Plants, paragraph (a)(4), for Entergys failure to conduct an adequate risk assessment prior to isolating the condensate pumps minimum flow automatic control valve. Specifically, the inspectors identified that Entergy personnel had not analyzed the impact to plant risk with the condensate pumps minimum flow line to the main condenser isolated. Entergys corrective actions included declaring and announcing to site personnel the plant risk to be Orange, protecting further equipment, and initiating CR-VTY-2012-02074. The inspectors determined that the issue was more than minor because it is similar to IMC 0612, Power Reactor Inspection Reports, Appendix E, Examples of Minor Issues, example 7.e in that the overall elevated plant risk put the plant into a higher risk category established by Entergy. 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 timeframe that the condensate pumps were unavailable was less than 1E-6 (approximately 2E-7). The inspectors determined that the finding had a cross-cutting aspect in the Human Performance cross-cutting area, Resources component, because the equipment relied upon to perform the risk assessment, the equipment out of service software program (EOOS), did not include the condensate system automatic minimum flow control valve, which was not adequate to ensure nuclear safety. |
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
|---|---|
| Report | IR 05000271/2012003 Section 1R13 |
| Date counted | Jun 30, 2012 (2012Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.13 |
| Inspectors (proximate) | S Rutenkroger J Brand R Bellamy S Rich C Williams K Dunham B Dionne |
| CCA | H.1, Resources |
| INPO aspect | LA.1 |
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Finding - Vermont Yankee - IR 05000271/2012003 | |||||||||||||||||||||||||||||||||
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Finding List (Vermont Yankee) @ 2012Q2
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