ML13303B114
| ML13303B114 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 08/14/1989 |
| From: | Hickman D Office of Nuclear Reactor Regulation |
| To: | Baskin K, Cotton G SAN DIEGO GAS & ELECTRIC CO., SOUTHERN CALIFORNIA EDISON CO. |
| References | |
| TAC-71194, TAC-71195, NUDOCS 8908180443 | |
| Download: ML13303B114 (4) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 August 14, 1989 Docket Nos.
50-361 and 50-362 Mr. Kenneth P. Baskin Mr. Gary D. Cotton Vice President Senior Vice President Southern California Edison Company Engineering and Operations 2244 Walnut Grove Avenue San Diego Gas and Electric Company Post Office Box 800 101 Ash Street Rosemead, California 91770 Post Office Box 1831 San Diego, California 92112 Gentlemen:
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION, SAN ONOFRE NUCLEAR GENERATING STATION, UNITS 2 AND 3 (TAC NOS. 71194 AND 71195)
By letter dated December 16, 1968, you transmitted the results of the second phase of your comprehensive Component Cooling Water (CCW) system reassessment for San Onofre Units 2 and 3. The staff has reviewed your report, entitled "Component Cooling Water System Operatility Assessment," and finds four issues of concern. You responded to the first concern by letter dated July 25, 1989.
Please provide responses to the remaining items within 30 days of your receipt of this letter.
- 1. On page VI-4 of your report, you state that a critical crack is postulated to occur in the non-seismic piping during a safe shutdown earthquake (SSE), rather than a guillotine break. This does not conform with the staff's position that a guillotine break must be assumed. Please reanalyze the system response to a SSE assuming the non-seismic piping sustains a single, worst-case guillotine break.
- 2. On page VI-4 of your report, you state that high level in the surge tank is the worst case initial condition for a SSE, since the nitrogen volume will be at a minimum. It is not obvious that a higher water inventory is a worse initial condition than a lower inventory. Please provide analyses to substantiate this assumption.
- 3. On page VI-5 of your report, you state that you will evaluate upgrading the CCW system to be less susceptible to water hammer in lieu of pursuing more detailed analyses of the effects of water hammer. In a telephone conversation on February 9, 1989, you stated that a parametric study was underway which would evaluate modifications to eliminate the formation of voids. This study was scheduled to be completed in May or June of this year. Please provide the results of this study for our review.
8908180443 890814 PDR ADOCK 05000361 P
PNU
Letter to Mssrs. Baskin and Cotton August 14, 1989
- 4. On Page VI-4 of your report, you state that 20.9 seconds is the maximum closure time for the critical loop/non-critical loop isolation valves.
Yet LER 88-008-001 for Unit 2 states, on Page 4, that the IST criteria for these valves needed to be reduced to 14.5 seconds. Please provide the analysis which concluded that 20.9 seconds is an acceptable value.
The reporting and/or'recordkeeping requirements of this letter affect fewer than ten respondents; therefore, OMB clearance is not require under P.L.96-511.
Sincerely,
/s/
Donald E. Hickman, Project Manager Project Directorate V Division of Reactor Projects -
- III, IV, V and Special Projects Office of Nuclear Reactor Regulation cc:
See next page DISTRIBUTION
<ocketnFile NRC & Local PDRs PD5 Reading MVirgilio JLee DHickman OGC E. Jordan B. Grimes ACRS (10)
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[RFAI 71194/95]
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Letter to Mssrs. Baskin and Cotton August 14, 1989
- 4. On Page VI-4 of your report, you state that 20.9 seconds is the maximum closure time for the critical loop/non-critical loop isolation valves.
Yet LER 88-008-001 for Unit 2 states, on Page 4, that the IST criteria for these valves needed to be reduced to 14.5 seconds. Please provide the analysis which concluded that 20.9 seconds is an acceptable value.
The reporting and/or recordkeeping requirements of this letter affect fewer than ten respondents; therefore, OMB clearance is not require under P.L.96-511.
Sincerely,
/s/
Donald E. Hickman, Project Manager Project Directorate V Division of Reactor Projects -
- III, IV$ V and Special Projects Office of Nuclear Reactor Regulation cc:
See next page DISTRIBUTION Docket File NRC & Local PORs PD5 Reading MVirgilio JLee DHickman OGC E. Jordan B. Grimes ACRS (10)
[RFAI 71194/95]
DR a 5
D P 5 DHickman:dr on 8/il /89 8/1) /89 OFFICIAL RECORD COPY
Mr. Kenneth P. Baskin San Onofre Nuclear Generating Southern California Edison Company Station, Units 2 and 3 cc:
Charles R. Kocher, Esq.
Mr. Mark Medford James A. Beoletto, Esq.
Southern California Edison Company Southern California Edison Company 2244 Walnut Grove Avenue 2244 Walnut Grove Avenue P. 0. Box 800 P. 0. Box 800 Rosemead, California 91770 Rosemead, California 91770 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.
Dr. Gerard C. Wong, Chief Rourke & Woodruff Radiological:Materials Control 701 S. Parker St. No. 7000 Section Orange, California 92668-4702 State Department of Health Services 714 P Street, Building #8 Mr. Sherwin Harris Resource Project Manager Public Utilities Department Resident Inspector, San Onofre NPS City of Riverside co U.S. Nuclear Regulatory Commission 3900 Main Street Post Office Box 4329 Riverside, California 92522 San Clemente, California 92672 Mayor, City of San Clemente Mr. Charles B. Brinkman San Clemente, California 92672 Combustion Engineering, Inc.
12300 Twinbrook Parkway, Suite 330 Regional Administrator, Region V Rockville, Maryland 20852 U.S. Nuclear Regulatory Commission 1450 Maria Lane/Suite 210 Mr. Roy Zimmerman Walnut Creek, California 94596 U.S. Nuclear Regulatory Commission Region V Chairman, Board of Supervisors 1450 Maria Lane, Suite 210 San Diego County Walnut Creek, California 94596 1600 Pacific Highway, Room 335 San Diego, California 92101 Mr. Don Womeldorf Chief Environmental Mangement Branch Mr. F. B. Marsh, Project Manager California Department of Health Bechtel Power Corporation 714 P Street, Room 616 P.O. Box 60860 Sacramento, California 95814 Terminal Annex Los Angeles, California 90060 (15)