ML13303B190
| ML13303B190 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 01/30/1990 |
| From: | Kokajko L Office of Nuclear Reactor Regulation |
| To: | Cotton G, Ray H San Diego Gas & Electric Co, Southern California Edison Co |
| Shared Package | |
| ML13303B191 | List: |
| References | |
| TAC-59139, TAC-59140 NUDOCS 9002050026 | |
| Download: ML13303B190 (4) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 January 30, 1990 Docket Nos. 50-361 and 50-362 Mr. Harold B. Ray Mr. Gary D. Cotton Vice President Senior Vice President Southern California Edison Company Engineering and Operations Irvine Operations Center San Diego Gas and Electric Company 23 Parker Street 101 Ash Street Irvine, California 92718 San Diego, California 92112 Gentlemen:
SUBJECT:
SAFETY EVALUATION REPORT REGARDING COMPLIANCE WITH THE ATWS RULE, 10 CFR 50.62 FOR SAN ONOFRE NUCLEAR GENERATING STATION, UNIT NOS.
2 AND 3 (TAC NOS. 59139 AND 59140)
The ATWS Rule (10 CFR 50.62, "Requirements for Reduction of Risk from Anticipated Transients Without Scram (ATWS) Events for Light-Water-Cooled Nuclear Power Plants") requires improvements in the design and operation of commercial nuclear power facilities to reduce the likelihood of failure to shutdown the reactor following anticipated transients, and to mitigate the consequences of an ATWS event. The requirements for Combustion Engineering plants such as San Onofre Units 2 and 3 are to provide a diverse scram system (DSS), diverse emergency feedwater actuation system (DEFAS) and diverse initiation of turbine trip (DTT). Paragraph (c)(6) of the rule requires that information sufficient to demonstrate compliance with the requirements be submitted to NRR.
By letters dated November 22 and December 29, 1988, and November 2, 1989, Southern California Edison Company provided information concerning implementa tion of the ATWS Rule requirements at San Onofre Units 2 and 3. The Instrumentation and Control Systems Branch and the EG&G Idaho Inc., our consultant, have reviewed this information. Based on this review, we have concluded that the DSS and DTT designs are acceptable.
However, the licensee's request for an exemption from installing diverse auxiliary feedwater actuation circuitry is not acceptable. The licensee is required to meet the requirements of 10 CFR 50.62 regarding DEFAS. The staff informed the licensee during a meeting with the CEOG on July 12, 1989 that the implementation of the ATWS Rule should be independent of the staff's review of the DEFAS. The evaluation of the DEFAS for compliance with the ATWS Rule will be addressed in a separate document.
Additionally, your letter on December 5, 1989 committed to installing DEFAS on
- Unit 2 during the Cycle 6 refueling outage, which is currently scheduled to 1550506 0130 ADOCK 05000361 P
Messrs Ray and Cotton
- 2 begin in September 1991. Installation on Unit 3 will occur no later than after the end of the Unit 2 Cycle 6 refueling outage, or before if conditions permit. We understand that you are prepared, if necessary, to shutdown Unit 3 in order to meet this DEFAS implementation schedule. We also note that you intend to submit a description of the San Onofre Units 2 and 3 DEFAS design, including identification of the differences between the San Onofre design and the CEOG generic design, by March 1, 1990. Therefore, we find that your DEFAS implementation schedule as outlined in the December 5, 1989 letter acceptable.
Sincerely, Lawrence E. Kokajko, Project Manager Project Directorate V Division of Reactor Projects -
- III, IV, V and Special Projects Office of Nuclear Reactor Regulation
Enclosures:
As stated cc w/enclosure:
See next page
Messrs Ray and Cotton San Onofre Nuclear Generating Southern California Edison Company Station, Units 2 and 3 cc:
Charles R. Kocher, Esq.
Mr. F. B. Marsh, Project Manager James A. Beoletto, Esq.
Bechtel Power Corporation Southern California Edison Company P.O. Box 60860 Irvine Operations Center Terminal Annex 23 Parker Los Angeles, California 90060 Irvine, California 92718 Mr. Robert G. Lacy Orrick, Herrington & Sutcliffe Manager, Nuclear Department ATTN:
David R. Pigott, Esq.
San Diego Gas & Electric Company 600 Montgomery Street P. 0. Box 1831 San Francisco, California 94111 San Diego, California 92112 Alan R. Watts, Esq.
Mr. John Hickman Rourke & Woodruff Senior Health Physicist 701 S. Parker St. No. 7000 Environmental Radioactive Mgmt. Unit Orange, California 92668-4702 Environmental Management Branch State Department of Health Services Mr. Sherwin Harris 714 P Street, Room 616 Resource Project Manager Sacramento, California 95814 Public Utilities Department City of Riverside Resident Inspector, San Onofre NPS 3900 Main Street do U.S. Nuclear Regulatory Commission Riverside, California 92522 Post Office Box 4329 San Clemente, California 92672 Mr. Charles B. Brinkman Combustion Engineering, Inc.
Mayor, City of San Clemente 12300 Twinbrook Parkway, Suite 330 San Clemente, California 92672 Rockville, Maryland 20852 Regional Administrator, Region V Mr. Phil Johnson U.S. Nuclear Regulatory Commission U.S. Nuclear Regulatory Commission 1450 Maria Lane/Suite 210 Region V Walnut Creek, California 94596 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Chairman, Board of Supervisors San Diego County Mr. Don Womeldorf 1600 Pacific Highway, Room 335 Chief Environmental Management Branch San Diego, California 92101 California Department of Health 714 P Street, Room 616 Sacramento, California 95814 (14)
Messrs Ray and Cotton January 30, 1990 begin in September 1991.
Installation on Unit 3 will occur no later than after the end of the Unit 2 Cycle 6 refueling outage, or before if conditions permit. We understand that you are prepared, if necessary, to shutdown Unit 3 in order to meet this DEFAS implementation schedule. We also note that you intend to submit a description of the San Onofre Units 2 and 3 DEFAS design, including identification of the differences between the San Onofre design and the CEOG generic design, by March 1, 1990. Therefore, we find that your DEFAS implementation schedule as outlined in the December 5, 1989 letter acceptable.
Sincerely, original signed by Lawrence Kokajko Lawrence E. Kokajko, Project Manager Project Directorate V Division of Reactor Projects -
- III, IV, V and Special Projects Office of Nuclear Reactor Regulation
Enclosures:
As stated cc w/enclosure:
See next page DISTRIBUTION-,
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