05000361/FIN-2012009-01
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Failure to Verify Adequacy of Thermal-Hydraulic and Flow-Induced Vibration Design for the Unit 2 Replacement Steam Generators |
| Description | The inspectors identified a noncited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the failure to verify the adequacy of the thermal-hydraulic and flow-induced vibration design of the Unit 2 replacement steam generators, resulting in excessive and unexpected steam generator tube wear after one cycle of operation. The licensee initiated Nuclear Notification NN 202447268 to address this issue in the corrective action program. Southern California Edison revised the thermal-hydraulic code of record and ensured that the code was in accordance with ASME guidance. Subsequently, on June 7, 2013, Southern California Edison announced that Units 2 and 3 would be permanently shut down. The finding is more than minor because it is associated with the equipment performance attribute of the Initiating Event Cornerstone and adversely affected the cornerstone objective of limiting the likelihood of those events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. The inspectors used NRC Inspection Manual Chapter 0609, Attachment 4 and Appendix A, to evaluate the significance of this finding. In accordance with Exhibit 1 of Inspection Manual Chapter 0609, Appendix A, the inspectors determined that the finding was of very low safety significance because the finding did not involve a degraded steam generator tube that could not sustain three times the normal operating differential pressure and did not violate the accident leakage performance criterion. No cross-cutting aspect was assigned because this performance deficiency occurred in the 2005 to 2008 timeframe. Substantial management and personnel changes have occurred, including taking actions to address a chilled work environment and other safety culture issues. The NRC determine d that the performance behavior that existed at that time is not indicative of current performance. |
| Site: | San Onofre  |
|---|---|
| Report | IR 05000361/2012009 Section 4OA5 |
| Date counted | Jun 30, 2013 (2013Q2) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | A Howell C Thurston E Murphy G Warrier G Werner J Billoue J Reynoso M Bloodgood R Lantz V Dhir |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| INPO aspect | |
| ' | |
Finding - San Onofre - IR 05000361/2012009 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (San Onofre) @ 2013Q2
Self-Identified List (San Onofre)
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||