ML080100012
| ML080100012 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 01/16/2008 |
| From: | Kalyanam N NRC/NRR/ADRO/DORL/LPLIV |
| To: | Rosenblum R Southern California Edison Co |
| Kalyanam N, NRR/DORL/LP4, 415-1480 | |
| References | |
| TAC MD6835 | |
| Download: ML080100012 (4) | |
Text
January 16, 2008 Mr. Richard M. Rosenblum Senior Vice President and Chief Nuclear Officer Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92674-0128
SUBJECT:
SAN ONOFRE NUCLEAR GENERATING STATION, UNIT 3 - REQUEST FOR ADDITIONAL INFORMATION ON LICENSE AMENDMENT REQUEST FOR ONE-TIME EXTENSION FROM THE CURRENTLY APPROVED 15-YEAR INTERVAL SINCE THE LAST INTEGRATED LEAK RATE TEST (TAC NO.
MD6835)
Dear Mr. Rosenblum:
By letter dated September 24, 2007 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML072681094), Southern California Edison (the licensee) submitted an application requesting for a one-time extension from the currently approved 15-year interval since the last Integrated Leak Rate Test (ILRT) to a 16-year interval since the last ILRT for the San Onofre Nuclear Generating Station, Unit 3.
After reviewing your request, the Nuclear Regulatory Commission staff has determined that additional information outlined in the enclosure is needed to complete the review. We discussed this information with your staff by telephone and they agreed to provide the additional information requested within 30 days of the receipt of this letter.
If you have any questions, please contact me at (301) 415-1480.
Sincerely,
/RA/
N. Kalyanam, Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-362
Enclosure:
Request for Additional Information cc w/encl: See next page
(*)No major change from Staff provided RAI OFFICE NRR/LPL4/PM NRR/LPL4/LA NRR/DAR/APLA*
NRR/LPL4/BC NAME NKalyanam JBurkhardt MRubin (*)
THiltz DATE 1/16/08 1/11/08 12/20/07 1/16/08
REQUEST FOR ADDITIONAL INFORMATION SAN ONOFRE NUCLEAR GENERATING STATION, UNIT 3 TECHNICAL SPECIFICATIONS CHANGES FOR EXTENSION OF THE 15-YEAR INTERVAL FOR THE INTEGRATED LEAK RATE TEST TO A 16-YEAR INTERVAL
- 1.
The request for a one-time extension from the currently approved 15-year Integrated Leak Rate Test (ILRT) interval to a 16-year ILRT interval is based on a later version of the San Onofre Nuclear Generating Station, Unit 3 (SONGS 3) probabilistic risk analysis (PRA) and offsite consequence analysis used to support the 15-year extension (as provided in Southern California Edisons May 27, 2005, letter (Agencywide Documents Access and Management System (ADAMS) Accession No. ML051530089). Please provide a description of:
- a.
the major changes to the Level 1 PRA that resulted in the increase in internal events core damage frequency from 1.79E-5 per year to 3.00E-5 per year,
- b.
the major changes to the Level 2 PRA and/or offsite consequence analysis that resulted in the reduction in the baseline offsite population dose from 35.5 to 9.7 person-roentgen man equivalent man (rem) per year for internal events, and from 72.9 to 12.2 person-rem per year for internal and external events combined, and
- c.
the internal and external reviews of the above changes, and the findings and recommendations from these reviews.
- 2.
The baseline risk assessment indicates that the increase in large early release frequency (LERF) resulting from a change in the ILRT interval from three tests in 10 years to one test in 16 years is 5.27E-7 per year (for internal and external events combined). This value was subsequently reduced to 8.69E-8 per year through three successive refinements in the analysis that credited: (a) removal of sequences with operation of containment sprays or flooding of ex-vessel core debris, (b) more realistic treatment of the probability of sump clogging, and (c) removal of additional sequences in which key fission products would not be released in an early timeframe. The total LERF for SONGS 3 is not reported in the submittal. Please provide the total LERF (for internal events as well as internal and external events combined) for the baseline analysis and for each of the three refined analyses.
Waterford Steam Electric Station, Unit 3 cc:
Senior Vice President Entergy Nuclear Operations P.O. Box 31995 Jackson, MS 39286-1995 Senior Vice President and COO Entergy Operations, Inc.
P.O. Box 31995 Jackson, MS 39286-1995 Vice President, Operations Support Entergy Services, Inc.
P.O. Box 31995 Jackson, MS 39286-1995 Site Vice President Waterford Steam Electric Station, Unit 3 Entergy Operations, Inc.
17265 River Road Killona, LA 70057-3093 General Manager, Plant Operations Waterford Steam Electric Station, Unit 3 Entergy Operations, Inc.
17265 River Road Killona, LA 70057-3093 Director, Nuclear Safety & Licensing Entergy Services, Inc.
440 Hamilton Avenue White Plains, NY 10601 Director, Nuclear Safety Assurance Entergy Operations, Inc.
17265 River Road Killona, LA 70057-3093 Senior Manager, Nuclear Safety
& Licensing Entergy Services, Inc.
P.O. Box 31995 Jackson, MS 39286-1995 Manager, Licensing Entergy Operations, Inc.
17265 River Road Killona, LA 70057-3093 Mr. Timothy Pflieger Environmental Scientist - Supervisor REP&R-CAP-SPOC Louisiana Department of Environmental Quality P.O. Box 4312 Baton Rouge, LA 70821-4312 Parish President Council St. Charles Parish P.O. Box 302 Hahnville, LA 70057 Chairman Louisiana Public Services Commission P.O. Box 91154 Baton Rouge, LA 70825-1697 Mr. Richard Penrod, Senior Environmental Scientist/State Liaison Officer Office of Environmental Services Northwestern State University Russell Hall, Room 201 Natchitoches, LA 71497 Resident Inspector Waterford NPS P.O. Box 822 Killona, LA 70057-0751 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011