ML11140A099
| ML11140A099 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 05/26/2011 |
| From: | Patrick Boyle Plant Licensing Branch II |
| To: | Ajluni M Southern Nuclear Operating Co |
| Boyle P | |
| References | |
| TAC ME5417, TAC ME5418 | |
| Download: ML11140A099 (2) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 May 26,2011 Mr. M. J. Ajluni Nuclear Licensing Director Southern Nuclear Operating Company, Inc.
40 Inverness Center Parkway Post Office Box 1295, Bin - 038 Birmingham, AL 35201-1295
SUBJECT:
VOGTLE ELECTRIC GENERATING PLANT, UNITS 1 AND 2 PRESUBMITT AL CONSIDERATION OF STEAM GENERATOR ALTERNATIVE REPAIR CRITERIA REQUIREMENTS - REQUEST FOR ADDITIONAL INFORMATION (TAC NOS. ME5417 AND ME5418)
Dear Mr. Ajluni:
The following is a Request for Additional Information for Vogtle Electric Generating Plant, Units 1 and 2 presubmittal review of a license amendment request to apply alternative repair criteria for the steam generator tube inspections.
The Nuclear Regulatory Commission (NRC) staff understands that in responding to MPR Question 22, Westinghouse made adjustments to the coefficient of thermal expansion (CTE) statistics. One of these adjustments was that the tube and tubesheet CTE sample variances were calculated using the data from only the Westinghouse experiments in order to decrease the spread of data at a given temperature. What is the justification for not considering all the data available? What effect would consideration of all available data have on the calculated variances versus what was considered in the probabilistic H* analysis?
The NRC staff's request for additional information is enclosed. Please provide a response within thirty (30) days of the date of this letter.
Sincerely, Patrick G. Boyle, Project Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-424 and 50-425 cc: Distribution via Listserv
'.. ML11140A099 OFFICE NRR/LPL2-1/PM NRR/LPL2-1/LA NRR/CSGB/BC NRR/LPL2-1/BC NRR/LPL2-1/PM NAME PBoyle MOBrien (BCtayton for)
RTaylor (MYoder for)
GKulesa PBoyle DATE 05/23/11 05/23/11 05/23/11 05/25/11 05/26/11