05000275/FIN-2012003-06
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Finding | |
|---|---|
| Title | Failure to Follow Procedure Resulted in the Loss of Low Temperature Overpressure Protection System Safety Function |
| Description | The inspectors identified a non-cited self-revealing violation of 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, following the unplanned loss of the Unit 1 low temperature overpressure protection system during Mode 5 operations on June 7, 2012. One train of the low temperature overpressure protection system safety function was lost after a maintenance technician mistakenly opened the breaker providing power to the functioning train performing troubleshooting activities on the other train. The licensees corrective actions included promptly restoring power to temperature overpressure protection system and entering the condition into the corrective action program as Notification 50488636. The failure of the plant technician to follow troubleshooting work instructions was a performance deficiency. This performance deficiency was more than minor because the performance deficiency is associated with the human performance attribute of the Barrier Integrity Cornerstone and affected the cornerstone objective to provide reasonable assurance that physical design barriers protect the public from radionuclide releases caused by accidents or events. The inspectors concluded that the finding is of very low safety significance (Green) because adequate mitigating equipment remained available and the finding did not constitute a loss of control, as defined in Appendix G, Shutdown Operations Significance Determination Process. This finding has a cross-cutting aspect in the area of human performance associated with the work practices component because the licensee failed to use human error prevention techniques, such as self- and peer-checking, commensurate with the risk of the assigned task such that work activities were performed safely. |
| Site: | Diablo Canyon  |
|---|---|
| Report | IR 05000275/2012003 Section 1R20 |
| Date counted | Jun 30, 2012 (2012Q2) |
| Type: | NCV: Green |
| cornerstone | Barrier Integrity |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.2 |
| Inspectors (proximate) | L Ricketson M Peck L Willoughby N O'Keefe N Greene N Makris |
| CCA | H.12, Avoid Complacency |
| INPO aspect | QA.4 |
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Finding - Diablo Canyon - IR 05000275/2012003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Diablo Canyon) @ 2012Q2
Self-Identified List (Diablo Canyon)
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