05000219/FIN-2012008-01
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Finding | |
|---|---|
| Title | Failure to Adequately Evaluate the impact of Increased Emergency Diesel Generators Loading on the Volume of Available Fuel Oil |
| Description | The inspectors identified a Green NCV of 10 CFR 50 Appendix B, Criterion XVI, Corrective Action, for Exelons failure to promptly identify and correct a condition adverse to quality. Specifically, Exelon did not promptly identify and correct the impact of increased emergency diesel generator (EDG) loading on the committed three day fuel oil supply. Existing procedural guidance requires load management actions after 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> which provides reasonable assurance of EDG operability. Exelon corrective actions include additional load management actions to ensure fuel oil capacity is maintained. This condition has been placed in the Exelons corrective action program. Exelons failure to promptly identify and correct an inadequate technical evaluation that did not determine the impact of increased EDG loading on the existing three day fuel oil supply was a performance deficiency. Inspectors determined that the finding was more than minor because the performance deficiency was associated with the design control attribute of the Mitigating Systems Cornerstone and the associated cornerstone objective of ensuring the capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the technical evaluation stated that #2 EDG loading could be as much as 2735 KW which translates to approximately 65 hours7.523148e-4 days <br />0.0181 hours <br />1.074735e-4 weeks <br />2.47325e-5 months <br /> of fuel capacity with the storage tank at minimum capacity versus the required 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. The EDGs remain operable because they are capable of supplying accident loads with adequate load management actions after eight hours of operation. The inspectors evaluated the finding using IMC 0609, Appendix A, the Significance Determination Process for Findings for At-Power, and determined that it was of very low safety significance (Green). The finding is not a deficiency affecting the design or qualification of a mitigating structure, system or component (SSC) and the SSC maintains its operability. The finding had a cross-cutting aspect in the area of problem identification and resolution, because Exelon did not thoroughly evaluate problems such that the resolutions address causes and extent of conditions, as necessary. Specifically, Exelons technical evaluations 1145338 and 1365452 failed to adequately evaluate the impact of increased loads on the amount of available EDG fuel oil. Therefore, at the increased loads of 2735 KW, the EDGs would have only had 65 hours7.523148e-4 days <br />0.0181 hours <br />1.074735e-4 weeks <br />2.47325e-5 months <br /> of the required 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> of fuel oil capacity. |
| Site: | Oyster Creek |
|---|---|
| Report | IR 05000219/2012008 Section 4OA2 |
| Date counted | Sep 30, 2012 (2012Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | G Hunegs A Patel S Barber J Ayala E Keighley |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - Oyster Creek - IR 05000219/2012008 | |||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Oyster Creek) @ 2012Q3
Self-Identified List (Oyster Creek)
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