05000361/FIN-2011004-06
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | Title 10 CFR Part 50, Appendix B, Criterion III, "Design Control," requires, in part, measures to be established to assure that applicable regulatory requirements and the design basis, are correctly translated into specifications, drawings, procedures, and instructions. Contrary to the above, prior to January 14, 2011, the licensee failed to ensure the sharing of systems by cross-connecting the non-Class 1E 6.9 kV busses would not impact to the orderly cool down and shutdown of one unit given an accident in the other unit as required by 10 CFR Part 50, Appendix A, General Design Criterion 5, "Sharing of Structures, Systems and Components." Immediate corrective actions were taken by placing administrative controls that restricted alignment of the 6.9 kV electrical busses between the units to periods when the opposite unit is shutdown or defueled. Using the Manual Chapter 0609, "Significance Determination Process," Phase 1 Worksheets, this finding is determined to have a very low safety significance because the finding: (1) is not a design or qualification issue confirmed not to result in a loss of operability or functionality; (2) did not represent an actual loss of safety function of the system or train; (3) did not result in the loss of one or more trains of non-technical specification equipment; and (4) did not screen as potentially risk significant due to a seismic, flooding, or severe weather initiating event. The issue was entered into the licensee's corrective action program as Nuclear Notification NN 201286253. |
| Site: | San Onofre  |
|---|---|
| Report | IR 05000361/2011004 Section 4OA7 |
| Date counted | Sep 30, 2011 (2011Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | R Lantz J Reynoso G Warnick E Ruesch S Achen |
| INPO aspect | |
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Finding - San Onofre - IR 05000361/2011004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (San Onofre) @ 2011Q3
Self-Identified List (San Onofre)
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