05000440/FIN-2009003-10
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Finding | |
|---|---|
| Title | Work on Wrong Relay Affecting Shutdown Cooling |
| Description | A finding of very low safety significance was self-revealed on April 28, 2009, for the failure to follow maintenance procedure PTI-N41-P0002, Generator Switchgear Protective Relay Trip Test, when electricians performed maintenance on an incorrect relay associated with bus L11. Bus L11 was not previously identified as a protected component related to shutdown cooling. Therefore, no risk management actions were implemented by the licensee. The licensee posted bus L11 as a protected train and repaired the 1R22-Q103A and 86B circuitry. The licensee entered the issue into its corrective action program as CR-09-58187.The finding was determined to be more than minor because the finding was associated with the Initiating Events cornerstone attribute of equipment performance and affected the cornerstone objective of limiting the likelihood of those events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. Specifically, had the 1R22-Q103A relay circuitry functioned as designed, a loss of decay heat removal event would have occurred. Using IMC 0609, Appendix G, Shutdown Operation Significance Determination Process, Checklist 8, the inspectors determined that the finding did not require a Phase 2 or Phase 3 analysis because the plant had appropriately met the safety function guidelines for core heat removal, inventory control, power availability, containment integrity, and reactivity control. The issue did not need a quantitative assessment and screened as having very low safety significance using Figure 1. This finding has a cross-cutting aspect in the area of human performance, work practices, per IMC 0305 H.4(a), because the licensee did not use error prevention techniques commensurate with the risk of the maintenance activity |
| Site: | Perry  |
|---|---|
| Report | IR 05000440/2009003 Section 4OA3 |
| Date counted | Jun 30, 2009 (2009Q2) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | M Wilk M Marshfield M Phalen D Jones M Franke J Bashore R Leidy J Cameron R Murray C Tilton J Coroju-Sandin |
| CCA | H.12, Avoid Complacency |
| INPO aspect | QA.4 |
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Finding - Perry - IR 05000440/2009003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Perry) @ 2009Q2
Self-Identified List (Perry)
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