ML13094A193

Meeting Handout - Independent Operational Assessment

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: ML13094A181 ML13094A191 ML13094A193 ML13095A347
References
TAC ME9534
Download: ML13094A193 (4)

Text

St. Lucie (PSL) Unit 2 Independent Operational Assessment Alan Brown March 14, 2013 Engineering and Projects St. Lucie Unit 2 Independent Operational Assessment - Alan Brown - March 14, 2013 - p.1

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.2

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.3

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%

Engineering and Projects St. Lucie Unit 2 Independent Operational Assessment - Alan Brown - March 14, 2013 - p.4