ML120250543
| ML120250543 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 01/25/2012 |
| From: | Balwant Singal Plant Licensing Branch IV |
| To: | Hope T Luminant Generation Co |
| Singal, B K, NRR/DORL, 301-415-301 | |
| References | |
| TAC ME6827 | |
| Download: ML120250543 (1) | |
Text
From:
Singal, Balwant Sent:
Wednesday, January 25, 2012 3:26 PM To:
'Hope, Timothy' Cc:
'paul.passalugo@luminant.com'; 'Jack.Hicks@luminant.com'
Subject:
Request for Additional Information (RAI) - Relief Request A TAC ME6827 Tim:
The U.S. Nuclear Regulatory Commission (NRC) staffs Probabilistic Risk Assessment (PRA)
Licensing Branch has reviewed your application dated August 2, 2011 (Agencywide Documents Access and Management System (ADAMS), Accession No. ML11220A261) for Relief Request A-1 and requires the following additional information to complete its review.
- 1. The Luminant Generation Company LLC (Luminant, the licensee) used Electric Power Research Institute (EPRI) Topical Report (TR) 1018427 to address those supporting requirements significant to the PRA for risk-informed inservice inspections (RI-ISI). The NRC has endorsed TR 1021467 through a NRC safety evaluation (ADAMS Accession No. ML11262A2060) for determining the technical adequacy of the PRA for RI-ISI. Please review your analysis and address any outstanding supporting requirements for this application by using guidance found in the safety evaluation that references EPRI TR 1021467.
- 2. The licensee noted that two supporting requirements (SY-A22 and DA-C15) of the American Society of Mechanical Engineers (ASME) standard (ASME RA-Sb-2005) as provided by PRA technical adequacy guidance in EPRI TR 1018427 are related to the use of hardware fault recovery. DA-C15 and SY-A22 are not related in this standard. In ASME RA-Sb-2005, DA-C15 pertains to data on recovery of plant-specific initiating events while SY-A22 addresses repair of hardware faults. Please provide additional justification that disposition DA-C15 for this application.
Draft RAIs were transmitted on January 18, 2012 and a clarification call was held on January 25, 2012. It was agreed that Luminant will respond to these RAIs within 30 days from the date of this e-mail. Please treat these RAIs as formal RAIs. It may be noted that your application is being reviewed by one additional technical branch and there may be additional RAI from that branch.
Thanks.