ML13303B341
| ML13303B341 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 08/07/1991 |
| From: | Kokajko L Office of Nuclear Reactor Regulation |
| To: | Cotton G, Ray H San Diego Gas & Electric Co, Southern California Edison Co |
| References | |
| TAC-68599, TAC-68600 NUDOCS 9108090158 | |
| Download: ML13303B341 (5) | |
Text
Docket Nos. 50-361 August 7, 1991 and 50-362 Mr. Harold B. Ray Mr. Gary D. Cotton Senior Vice President Senior Vice President Southern California Edison Co.
Engineering and Operations Irvine Operations Center San Diego Gas & Electric Co.
23 Parker Street 101 Ash Street Irvine, California 92718 San Diego, California 92112 Gentlemen:
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION REGARDING STATION BLACKOUT SUBMITTAL (TAC NOS. 68599 AND 68600)
The NRC staff is reviewing your submittal regarding station blackout events for San Onofre Nuclear Generating Station, Unit Nos. 2 and 3. As a result of our review, additional information is necessary in order to complete our safety evaluation.
The enclosed Request for Addditional Information identifies the additional information that the staff requires in order to complete our review of your station blackout submittal.
Your response is requested within 30 days of receipt of this letter. If you desire further information, please contact me.
The reporting and/or recordkeeping requirements of this letter affect fewer than ten respondents; therefore, OMB clearance is not required under Public Law 96-511.
Sincerely, ORIGINAL SIGNED BY Lawrence E. Kokajko, Project Manager Project Directorate V Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation
Enclosure:
As stated cc w/enclosure:
yMp DISTRIBUTION:
Docket File NRC & LPDRs PDV p/f PDV r/f BBoger RZimmerman MVirgilio RCesaro AToalston LKokajko OGC AHon EJordan ACRS (10)
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- JDyer DATE :08/.5/91
- 08/C /91
- 08/,)/91 OFFICIAL RECORD COPY Document Name:
SO 2/3 ADD INFO 68599/600 9108090158 910807 PDR ADOCK 05000361 F
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555.
August 7, 1991 Docket Nos. 50-361 and 50-362 Mr. Harold B. Ray Mr. Gary D. Cotton Senior Vice President Senior Vice President Southern California Edison Co.
Engineering and Operations Irvine Operations Center San Diego Gas & Electric Co.
23 Parker Street 101 Ash Street Irvine, California 92718 San Diego, California 92112 Gentlemen:
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION REGARDING STATION BLACKOUT SUBMITTAL (TAC NOS. 68599 AND 68600)
The NRC staff is reviewing your submittal regarding station blackout events for San Onofre Nuclear Generating Station, Unit Nos. 2 and 3. As a result of our review, additional information is necessary in order to complete our safety evaluation.
The enclosed Request for Addditional Information identifies the additional information that the staff requires in order to complete our review of your station blackout submittal. Your response is requested within 30 days of receipt of this letter. If you desire further information, please contact me.
The reporting and/or recordkeeping requirements of this letter affect fewer than ten respondents; therefore, OMB clearance is not required under Public Law 96-511.
Sincerely, Lawrence E. Kokajko, Project Manager Project Directorate V Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation
Enclosure:
As stated cc w/enclosure:
See next page
Messrs. Ray and Cotton San Onofre Nuclear Generating Southern California Edison Company Station, Unit Nos. 2 and 3 cc:
James A. Beoletto, Esq.
Mr. Richard J. Kosiba, Project Manager Southern California Edison Company Bechtel Power Corporation Irvine Operations Center 12440 E. Imperial Highway 23 Parker Street Norwalk, California 90650 Irvine, California 92718 Mr. Robert G. Lacy Chairman, Board of Supervisors Manager, Nuclear Department County of San Diego San Diego Gas & Electric Company 1600 Pacific Highway, Room 335 P. 0. Box 1831 San Diego, California 92101 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 co U.S. Nuclear Regulatory Commission Riverside, California 92522 Post Office Box 4329 San Clemente,, California 92674 Mr. Charles B. Brinkman, Manager Washington Nuclear Operations ABB Combustion Engineering Nuclear Power Mayor 12300 Twinbrook Parkway, Suite 330 City of San Clemente Rockville, Maryland 20852 100 Avenida Presidio San Clemente, California 92672 Mr. Phil Johnson Regional Administrator, Region V U.S. Nuclear Regulatory Commission U.S. Nuclear Regulatory Commission Region V 1450 Maria Lane, Suite 210 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Walnut Creek, California 94596 Mr. Don J. Womeldorf Chief, Environmental Management Branch California Department of Health Services 714 P Street, Room 616 Sacramento, California 95814 (13)
REQUEST FOR ADDITIONAL INFORMATION SAN ONOFRE NUCLEAR GENERATING STATION, UNIT NOS. 2 AND 3 QUESTIONS ON SBO SUBMITTAL*
(1) Condensate Inventory Describe the condensate inventory analysis and list the major assumptions.
Show how the analysis took into account water used for (1) decay heat removal, (2) sensible heat from the RCS fluid and structure, (3) sensible heat removed from the steam generator fluid and structure, and (4) restora tion of steam generator water level.
Please provide the calculation package(s) that answers these questions.
(2) Battery Calculations According to the UFSAR (Section 8.3.2), Class 1E 125 VDC subsystems A and B are sized for 1.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> of operation, while subsystems C and D are sized for 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />. In your May 1, 1991, submittal you stated that the existing batteries are sufficient to cope with an SBO of four hours. In order to review the ability of the San Onofre 2 and 3 battery system to perform during an SBO event, we need the calculation package that was used to justify the four hour battery capacity. Provide an explanation of what loads will be stripped and when they will be stripped to ensure that the batteries will last for the four hour SBO without charging. Additionally, describe the load profile, method and assumptions (i.e., temperature factor, design margin, aging factor) that were used to determine that the battery capacity is adequate for four hours.
(3) Compressed Air Explain how will the ADVs be operated to remove decay heat during SBO conditions. Explain how you determined the adequacy of the bottled nitrogen containers supplying the ADVs. If local manual operation of the ADVs is required during an SBO, explain how the issue of habitability has been addressed.
(4) SBO Equipment QA Program Verify that all equipment needed to cope with an SBO event meets the provisions of RG 1.155, Regulatory Position 3.5.
- Supporting documentation should be available for each area. Detailed information may be required in some cases.
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(5)
Loss of HVAC More detailed explanations of the effects of loss of ventilation are needed.
Provide the calculation package(s) for our review. Our initial concerns are:
(a) Identify the areas chosen as areas of concern. Discuss areas that were considered, but dismissed as being of concern.
(b) Explain the methods that were used to calculate the temperature rises.
(c) State the major assumptions used in each room analysis (i.e., heat loads, initial temperatures, inverter efficiency, material properties, timing).
(d) Identify any rooms in which the corridor doors and/or designated cabinets need to be opened. Identify the procedure which governs this action.
(e) Describe the containment temperature analysis, including the expected temperature of the containment during an SBO and assessment of any equipment operability problems.
(6) Containment Integrity Explain the containment isolation valve (CIV) analysis and how CIVs are treated in SBO procedures. Provide an explanation of CIVs that could not be excluded using the five exclusion criteria of RG 1.155.
With respect to the containment sump recirculation line valves outside containment, HV-9302 and HV-9303, what prevents these valves from being open during normal operation? What provisions are provided to ensure that these valves are fully closed?
(7) Reactor Coolant Inventory Provide a summary of the RCS inventory analysis, including the RCS leak rates used, the initial and final RCS water volume and temperature, the amount of water required to cover the core, and any other key parameters and assumptions used in the calculation. Note:
the assumption of zero RCS pump seal leakage is not consistent with the SBO guidance.
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