05000348/FIN-2009005-06: Difference between revisions
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Latest revision as of 11:38, 30 May 2018
Finding | |
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| Title | Licensee-Identified Violation |
| Description | 10 CFR 50 Appendix B, Criterion XVI, Corrective Action, requires in part that conditions adverse to quality are promptly identified and corrected. Contrary to the above, the licensee identified steam leaks in the vicinity of the C SG steam supply valve (Q1N12HV3235B) to the Unit 1 TDAFW pump as early as November 17, 2007 and did not take prompt corrective actions to repair the leaks. As a result of the failure to implement corrective actions to repair the steam leaks, the o-ring for the air accumulator associated with Q1N12HV3235B was subjected to a high temperature environment and degraded to the point that the valve was declared inoperable when it failed to meet surveillance test acceptance criteria on March 27, 2009. This issue was identified in the licensees CAP as CR 2009103283. Following the failure of Q1N12HV3235B on March 27, 2009, the licensee completed repairs to the previously identified steam leaks and the failed actuator o-ring. Q1N12HV3235B was retested satisfactorily and returned to service on April 30, 2009. This finding was assessed using IMC 0609, SDP, Phase 1 screening worksheet for the mitigating systems cornerstone column and determined to require a Phase 2 analysis because the finding represented the loss of safety function of a single steam supply to the TDAFW pump for greater than the allowed TS outage time of seven days as given by condition A of TS 3.7.5, AFW System. A Regional Senior Reactor Analyst performed a Phase 3 evaluation under the Significance Determination Process and determined that the finding was of very low safety significance (Green). The exposure time for the analysis was 268 days. The analysis assumed the Turbine Driven Auxiliary Feedwater Pump failed but, could be easily recovered. The dominant accident sequence was a dual unit Loss of Offsite Power with loss of the Emergency Diesel Generators. The Turbine Driven Auxiliary Feedwater Pump would continue to operate but, due to the performance deficiency and an independent failure of the other steam supply to the turbine portion of the pump, it failed. Neither offsite power nor an Emergency Diesel Generator was recovered in two 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> which led to core damage |
| Site: | Farley  |
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| Report | IR 05000348/2009005 Section 4OA7 |
| Date counted | Dec 31, 2009 (2009Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | E Crowe S Shaeffer W Rogers G Macdonald B Caballero S Sandal |
| INPO aspect | |
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Finding - Farley - IR 05000348/2009005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Farley) @ 2009Q4
Self-Identified List (Farley)
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