ML072890032
| ML072890032 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  (NPF-010, NPF-015) |
| Issue date: | 10/18/2007 |
| From: | Kalyanam N NRC/NRR/ADRO/DORL/LPLIV |
| To: | Rosenblum R Southern California Edison Co |
| Kalyanam N, NRR/DORL/LP4, 415-1480 | |
| References | |
| TAC MD4419, TAC MD4420 | |
| Download: ML072890032 (4) | |
Text
October 18, 2007 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, UNITS 2 AND 3 -
REQUEST FOR ADDITIONAL INFORMATION ON THE PROPOSED LICENSE AMENDMENT ON DEGRADED VOLTAGE SETPOINTS (TAC NOS. MD4419 AND MD4420)
Dear Mr. Rosenblum:
By letter dated February 8, 2007 (Agencywide Documents Access and Management System Accession No. ML070440046), Southern California Edison (the licensee) submitted an application to revise the San Onofre Nuclear Generating Station, Units 2 and 3, Technical Specifications (TS) Surveillance Requirement (SR) 3.3.7.3.a to lower the allowable value for dropout and raise the allowable value for pickup of the degraded voltage function, and revise TS SR 3.8.1 to lower the diesel generator minimum output voltage due to lower settings for the degraded voltage function.
After reviewing your request, the Nuclear Regulatory Commission (NRC) staff has determined that additional information is needed to complete the review. To support NRC staffs assessment of the acceptability of the license amendment request, please provide:
(1)
On page 4 of Enclosure 2 to the license amendment request (LAR), it is stated that the sustained degraded voltage signal (SDVS) without safety injection actuation signal (SIAS) will transfer the 4.16 kilovolt (kV) Class 1E bus to the alternate preferred power source, if available.
Please confirm the type of bus transfer scheme. Is it a fast bus transfer scheme, slow/delayed bus transfer scheme, or the dead bus transfer scheme? Please provide a logic diagram for the scheme.
(2)
On page 4 of Enclosure 2 to the LAR, it is stated that the SDVS is blocked when the 4.16 kV Class 1E bus is powered from the DG.
Please confirm whether the degraded grid voltage with SIAS signal is also blocked when the 4.16 kV Class 1E bus is powered from the DG.
R. M. Rosenblum (3)
The purpose of 162T timers shown in Figure D-17 in the final safety analysis report (FSAR) is not clear.
Please provide an explanation of the purpose of 162T timers shown in Figure D-17 in the FSAR.
We discussed this information with your staff by telephone on October 10, 2007, 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 Nos. 50-361 and 50-362 cc w/encl: See next page
- Editorial Chgs only from staff provided SE OFFICE NRR/LPL4/PM NRR/LPL4/LA NRR/DE/EEEB*
NRR/LPL4/BC NAME NKalyanam JBurkhardt GWilson THiltz DATE 10/16/07 10/16/07 10/5/07 10/18/07
October 2007 San Onofre Nuclear Generating Station Units 2 and 3 cc:
Mr. Raymond W. Waldo, Vice President, Nuclear Generation Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92674-0128 Mr. Douglas K. Porter, Esquire Southern California Edison Company 2244 Walnut Grove Avenue Rosemead, CA 91770 Dr. David Spath, Chief Division of Drinking Water and Environmental Management California Dept. of Health Services 850 Marina Parkway, Bldg P, 2nd Floor Richmond, CA 94804 Chairman, Board of Supervisors County of San Diego 1600 Pacific Highway, Room 335 San Diego, CA 92101 Mark L. Parsons Deputy City Attorney City of Riverside 3900 Main Street Riverside, CA 92522 Mr. Gary L. Nolff Assistant Director - Resources City of Riverside 3900 Main Street, 4th Floor Riverside, CA 92522 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064 Mr. Michael L. DeMarco San Diego Gas & Electric Company 8315 Century Park Ct. CP21G San Diego, CA 92123-1548 Director, Radiologic Health Branch State Department of Health Services P.O. Box 997414, MS 7610 Sacramento, CA 95899-7414 Resident Inspector San Onofre Nuclear Generating Station c/o U.S. Nuclear Regulatory Commission Post Office Box 4329 San Clemente, CA 92674 Mayor City of San Clemente 100 Avenida Presidio San Clemente, CA 92672 Mr. James T. Reilly Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92674-0128 Mr. James D. Boyd, Commissioner California Energy Commission 1516 Ninth Street (MS 31)
Sacramento, CA 95814 Brian Katz Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92764-0128 Mr. Steve Hsu Department of Health Services Radiologic Health Branch MS 7610, P.O. Box 997414 Sacramento, CA 95899-7414 Mr. A. Edward Scherer Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92674-0128