05000219/FIN-2009003-07
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Finding | |
|---|---|
| Title | Ineffective Use of Operating Experience on Main Power Transformer Cooling System |
| Description | A self-revealing finding occurred when Exelon did not adequately evaluate operating experience (OE) regarding transformer cooling issues. Specifically, Exelon did not identify and correct a single point vulnerability (SPV) on the main transformers cooling system control circuitry. This resulted in a manual reactor scram in April 2009 when the M1A main power transformer lost all cooling and the cooling system could not be restored. This finding was determined not to be a violation of NRC requirements. Exelons corrective actions included modifying the cooling system control circuitry on theM1A and M1B main power transformer to address the SPV. This issue has been entered into Exelons corrective action program. The finding was more than minor in accordance with IMC 0612, Appendix B (Section1-3), Issue Screening, because it was associated with the equipment performance attribute of the initiating events cornerstone and affected the objective to limit the likelihood of those events that upset plant stability and challenge critical safety functions during power operation. In accordance with IMC 0609.04 (Table 4a), Phase 1 Initial Screen and Characterization of Findings, the finding was determined to be of very low safety significance (Green). The performance deficiency had a cross-cutting aspect in the area of problem identification and resolution, operating experience (IMC 0305, Aspect P.2(a)), because Exelon did not evaluate relevant internal and external OE to identify a SPV in the transformer cooling system |
| Site: | Oyster Creek |
|---|---|
| Report | IR 05000219/2009003 Section 4OA5 |
| Date counted | Jun 30, 2009 (2009Q2) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | |
| Inspectors (proximate) | S Pindale J Kulp M Ferdas T Fish R Nimitz S Chaudhary R Bellamy H Gray |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
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Finding - Oyster Creek - IR 05000219/2009003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Oyster Creek) @ 2009Q2
Self-Identified List (Oyster Creek)
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