05000282/FIN-2012003-04
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Finding | |
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| Title | Failure to Make a 60 Day Report Pursuant to 10 CFR 50.73 |
| Description | The inspectors identified a Severity Level IV non-cited violation (NCV) of 10 CFR 50.73(a)(2) due to the failure to report required plant events or conditions within 60 days of discovery of the event. Specifically, the licensee failed to report that the Unit 1 emergency diesel generators (EDGs) had accumulated 2202 hours0.0255 days <br />0.612 hours <br />0.00364 weeks <br />8.37861e-4 months <br /> of inoperability due to not maintaining the required quantity of fuel oil. The licensee initiated corrective action document 1343001 to document this issue. Corrective actions for this issue included revising procedures to ensure that required events or conditions were reported within the required time. The inspectors determined that the failure to report required plant events or conditions to the NRC within the required time had the potential to impede or impact the regulatory process. As a result, the NRC dispositioned violations of 10 CFR 50.73 using the traditional enforcement process instead of the SDP. However, if possible, the underlying technical issue was evaluated using the SDP. In this case the inspectors determined that the failure to ensure the adequacy of design calculations as specified by 10 CFR 50, Appendix B, Criterion III, Design Control, was the underlying technical issue to be evaluated using the SDP. Specifically, the licensee failed to verify that the fuel oil used at Prairie Island met the fuel energy content assumed in Design Calculation ENG-ME-020. In addition, the licensee had not verified that the calculated net brake horsepower was applied correctly. The inspectors determined that this issue was more than minor because it was similar to Example 3.j of IMC 0612, Appendix E, and because it was associated with the design control attribute of the Mitigating Systems Cornerstone. The finding also affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The inspectors evaluated the finding in accordance with IMC 0609, Appendix A, The Significance Determination Process (SDP) for Findings At-Power, Exhibit 2, Mitigating Systems Screening Questions. The fuel oil issue affected the 14-day supply needed for TS operability. However, the volume of fuel oil was adequate to support the 24-hour mission time assumed in the probabilistic risk assessment (PRA) mission time. In addition, the incorrect calculation of net brake horse power would not have prevented the EDGs from fulfilling their safety function. As a result, the finding was determined to be of very low safety significance. In accordance with Section 6.9.d.9 of the NRC Enforcement Policy, this violation was categorized as Severity Level IV because the underlying technical issue was evaluated by the SDP and determined to be of very low safety significance. The inspectors concluded that this finding had no cross-cutting aspect since the inadequate calculations were performed more than three years ago and therefore not reflective of current licensee performance. |
| Site: | Prairie Island  |
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| Report | IR 05000282/2012003 Section 4OA3 |
| Date counted | Jun 30, 2012 (2012Q2) |
| Type: | Finding: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | C Moore C Zoia D Betancourt K Riemer K Stoedter P Cardona Morales P Voss P Zurawski S Shah |
| INPO aspect | |
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Finding - Prairie Island - IR 05000282/2012003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Prairie Island) @ 2012Q2
Self-Identified List (Prairie Island)
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