ML13094A193
| ML13094A193 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 03/14/2013 |
| From: | Adrienne Brown AREVA |
| To: | Reinaldo Rodriguez Plant Licensing Branch II |
| Rodriguez R | |
| Shared Package | |
| ML13094A174 | List: |
| References | |
| TAC ME9534 | |
| Download: ML13094A193 (4) | |
Text
Engineering and Projects St. Lucie (PSL) Unit 2 Independent Operational Assessment Alan Brown March 14, 2013 St. Lucie Unit 2 Independent Operational Assessment - Alan Brown - March 14, 2013 - p.1
Engineering and Projects St. Lucie Unit 2 Independent Operational Assessment - Alan Brown - March 14, 2013 - p.2 Independent OA Summary Independent Operational Assessment (OA) performed by AREVA Provides defense-in-depth on operability evaluation One cycle of operation at power-uprate conditions evaluated Performed for limiting degradation mechanism in limiting steam generator The limiting degradation mechanism is Anti-Vibration Bar (AVB) wear The limiting steam generator (SG) is SG A.
Engineering and Projects St. Lucie Unit 2 Independent Operational Assessment - Alan Brown - March 14, 2013 - p.3 Independent OA Summary Growth Rates Depth-dependent growth evaluated
- Depth-dependent growth was evident from second cycle growth rates
- Depth-dependent growth was less pronounced in third cycle
- OA calculations performed with and without depth-dependent growth to determine which method is limiting
- Determined that not considering depth-dependent growth provided the more conservative result Factor of 1.24 applied to account for power-uprate conditions Assumption of constant work rate (i.e., constant volume loss) applied in evaluation
- Assumption is conservatively supported by previous results Non-Destructive Examination (NDE) measured growth rates were conservatively used
Engineering and Projects St. Lucie Unit 2 Independent Operational Assessment - Alan Brown - March 14, 2013 - p.4 Independent OA Summary Other inputs to OA Flaw shapes and lengths based on flaws profiled during the 2012 inspection Material properties based on St. Lucie Unit 2 tubing Depth sizing uncertainties based on EPRI Examination Technique Specification Sheet (ETSS) 96004.1 AREVA OA Model Single-cycle full-bundle model used Independent OA Results Probability of burst of 2.4% obtained for AVB wear for SGA after 1.3 effective full power years of operation at power-uprate conditions Meets the industry-accepted standard of 5%