05000454/FIN-2009004-02
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Finding | |
|---|---|
| Title | Diesel Oil Storage Vents Not Seismically Qualified or Tornado Resistant |
| Description | A finding of very low safety significance and associated NCV of 10 CFR 50, Appendix A, Criterion 2, Design Basis for Protection Against Natural Phenomena, and Criterion 4, Environmental and Natural Effects Design Bases, was identified by the inspectors for the failure to seismically support and protect the Emergency Diesel Generator (EDG) fuel oil storage tank vent lines from tornado generated missiles. Specifically, the licensee installed the vent lines as non-safety related and as such they were not seismically supported nor protected from tornado generated missiles. In response to the issue, the licensee performed an operability determination and concluded that the EDGs remained operable. This performance deficiency was more than minor because it was associated with the Mitigating Systems Cornerstone attribute of equipment performance and adversely affected the cornerstone objective of ensuring availability of the EDG to respond to initiating events to prevent undesirable consequences. This finding was of very low safety significance (Green) because the inspectors determined that the finding was a design deficiency confirmed not to result in loss of operability or functionality and the finding screened as Green using the Significance Determination Process Phase 1 screening worksheet. The inspectors did not identify a cross-cutting aspect associated with this finding because the performance deficiency occurred over 30 years ago and was not current. |
| Site: | Byron  |
|---|---|
| Report | IR 05000454/2009004 Section 4OA3 |
| Date counted | Sep 30, 2009 (2009Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | J Pearson J Bozga R Skokowski M Learn E Love C Tilton G Morell R Ng C Thompson B Bartlett J Robbins J Cassidy M Mitchell J Neurauter D Jones S Bakhsh T Go V Meghani |
| INPO aspect | |
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Finding - Byron - IR 05000454/2009004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Byron) @ 2009Q3
Self-Identified List (Byron)
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