05000237/FIN-2008007-01
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Finding | |
|---|---|
| Title | Failure to Perform a 10 CFR 50.59 Evaluation for Exceeding Continuous Rating on the EDG |
| Description | The inspectors identified a Severity Level IV NCV associated with the failure to perform a safety evaluation in accordance with 10 CFR 50.59. Specifically, the licensee failed to perform a safety evaluation when non-conservatively changing the design basis loading for the emergency diesel generators (EDG) in the design calculation. This resulted in the expected loading during a design basis accident no longer being bounded by the EDG endurance testing requirements contained in the Technical Specifications (TS). Because the licensee did not also evaluate the effect on the existing endurance test loading requirements, the testing no longer adequately verified the capability of the EDG to power its predicted loading during a LOOP/LOCA. This adverse change increased the probability of a malfunction of equipment important to safety EDG during a LOOP/LOCA event. Because the issue affected the NRC=s ability to perform its regulatory function, this finding was evaluated using the traditional enforcement process. The finding was determined to be more than minor because the inspectors could not reasonably determine that the change in EDG loading, which adversely affected equipment important to safety, would not have ultimately required NRC approval. The finding was determined to be of very low safety significance (Green) based on the results of the SDP Phase 1 screening worksheet. Specifically, the licensee was eventually able to demonstrate through an engineering evaluation, that the EDG loads would not exceed the bounding values contained in the endurance test criteria. The inspectors determined that there was no cross cutting aspect to this issue. |
| Site: | Dresden  |
|---|---|
| Report | IR 05000237/2008007 Section 1R21 |
| Date counted | Dec 31, 2007 (2007Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | R Daley |
| INPO aspect | |
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Finding - Dresden - IR 05000237/2008007 | |||||||||||||||||||||||||||||||||
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Finding List (Dresden) @ 2007Q4
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