05000335/FIN-2009002-02
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Finding | |
|---|---|
| Title | Failure to Take Timely and Effective Corrective Actions for EDG Day Tank Level Switch Failure |
| Description | The inspectors identified a Non Cited Violation (NCV) of 10 CFR 50, Appendix B, Criterion XVI, Corrective Action, for failure of the licensee to take timely and effective corrective actions to prevent recurrence of Unit 1 emergency diesel generator (EDG) day tank low level switch failures starting in 2007. Specifically, in June 2007, the licensee performed an apparent cause evaluation of sticking level switches and determined that a manufacturing defect associated with the packing gland of the floats pivot shaft caused some restricted movement. The licensee also determined that extended shelf life contributed to the failures of these level switches. However, other than replacing the switches with new ones, the only corrective action(s) that resulted from this evaluation were to ensure that switches manufactured before 2000 were not used for plant applications. Subsequently, in October 2008, the 1A-EDG day tank low level switch failed during the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> EDG run and again failed during maintenance activities in February 2009. The finding is more than minor because it is associated with the equipment performance attribute of the mitigating systems cornerstone. The finding was determined to have very low safety significance because an SDP Phase 3 analysis determined that the risk was less than 1E-6/year. This finding was related to the corrective action attribute of the problem identification and resolution cross-cutting area in the aspect of appropriate and timely corrective actions (IMC 0305 aspect P.1.d) |
| Site: | Saint Lucie  |
|---|---|
| Report | IR 05000335/2009002 Section 4OA2 |
| Date counted | Mar 31, 2009 (2009Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | M Sykes R Bernhard S Ninh S Sanchez T Hoeg |
| CCA | P.3, Resolution |
| INPO aspect | PI.3 |
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Finding - Saint Lucie - IR 05000335/2009002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Saint Lucie) @ 2009Q1
Self-Identified List (Saint Lucie)
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