05000400/FIN-2013005-03
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Finding | |
|---|---|
| Title | Inadequate Transformer Preventive Maintenance Procedure |
| Description | The inspectors determined that inadequate testing prescribed by procedure NGGPMB- XFM-02 and performed under procedure PM-E0015 was a performance deficiency. Specifically, licensee procedure ADM-NGGC-0107, Equipment Reliability Process Guideline, resulted in the determination that the 1E2 transformer was a critical component. Licensee procedure NGG-PMB-XFM-02, Equipment Reliability Template for Dry-Type Transformers, states that critical components are maintained to not allow any failure that would result in a trip, transient, or significant challenge to continued safe operation. However, implementing procedure PM-E0015, failed to contain steps to identify degradation in the 1E2 transformer windings prior to failure. This finding was more than minor because it is associated with the procedure quality attribute of the Initiating Events cornerstone and adversely affected the cornerstone objective of limiting the likelihood of those events that upset plant stability and challenge critical safety functions during power operation. Specifically, a power transient resulted from the 1E2 failure. Using IMC 0609, Significance Determination Process, Appendix A, Exhibit 1- Initiating Events Screening Questions, the inspectors determined this finding to be of very low safety significance (Green) because the finding did not cause a reactor trip and the loss of mitigation equipment relied upon to transition the plant from the onset of the trip to a stable shutdown condition (e.g. loss of condenser, loss of feedwater). The finding had a cross-cutting aspect of Long Term Safety, as described in the Resources component of the Human Performance cross-cutting area because the licensees evaluation of the transformer PM program in March 2012 removed additional testing which might have indicated that the transformer windings had experienced insulation degradation. |
| Site: | Harris  |
|---|---|
| Report | IR 05000400/2013005 Section 4OA2 |
| Date counted | Dec 31, 2013 (2013Q4) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | A Alen A Butcavage A Nielsen G Hopper J Austin J Laughlin J Rivera M Catts M Coursey P Lessard T Fanelli |
| CCA | H.6, Design Margins |
| INPO aspect | WP.2 |
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Finding - Harris - IR 05000400/2013005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Harris) @ 2013Q4
Self-Identified List (Harris)
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