ML13303A972
| ML13303A972 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 11/29/1988 |
| 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 8812070021 | |
| Download: ML13303A972 (4) | |
See also: IR 05000361/1988010
Text
epJR REG(, '
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UNITED STATES
NUCLEAR REGULATORY COMMISSION
WASHINGTON, D. C. 20555
November 29,
1988
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 INFORMATION REGARDING SAN ONOFRE NUCLEAR GENERATING
STATION, UNITS 2 AND 3 (TAC NOS. 71194 AND 71195)
In response to our Inspection Report Nos. 50-361/88-10 and 50-362/88-10, you
undertook a two phase comprehensive assessment of the Component Cooling Water
(CCW) System. By letter dated June 24, 1988 you provided the results of the
first phase of that assessment. In your letter you stated that you had con
cluded that no unreviewed safety questions were involved and that the overall
NCR as well as five individual NCRs addressed in the assessment are available
for review at the site. Because of the number of problems with the CCW System,
we request that you forward these six NCRs to us as soon as possible.
Your Licensee Event Report (LER) 88-008-01 for San Onofre Unit 2 describes the
corrective actions you have taken as a result of the CCW System deficiencies.
The two modifications and the one procedure revision which you discussed each
have the potential to be an unreviewed safety question or to require a change
to the Technical Specifications. Because of the number of changes which have
been made to the system, we request that you forward the 10 CFR 50.59 evalua
tions for these changes which determined that they were neither unreviewed safety
questions nor changes to the Technical Specifications. These changes were (1)
the addition of a seismic makeup capability to the CCW System in 1984, (2) the
reduction in the IST acceptance criterion for non-critical loop isolation valve
closure time, and (3) the removal of the thermal overload devices from the CCW
surge tank isolation valve motor operator breaker.
Your LER 88-019-00 for San Onofre Unit 2 states that the batteries are required
to operate up to six hours following an accident to support Shutdown Cooling
(SDC) valve operation. However, Section 6.3.3.4.1 of the Updated Final Safety
Analysis Report (UFSAR) states that the determination whether or not to enter
the SDC mode is made at six hours into the event, but that "cooling of the RCS.
with the steam generators continues until the SDC entry temperature is achieved.
ADOCK 05000:361
PDCA
Pro/
110
Mssrs. Baskin and Cotton
- 2 -
November 29, 1988
The HPSI pumps are then throttled until RCS pressure is reduced to the SDC
entry pressure. Next, all injection flow is shifted back to the cold legs and
SDC is initiated." Therefore, the batteries are required to operate for some
time greater than six hours to support SDC operation. It is not clear then
that the eight hour battery performance test which you described in your
corrective actions.is adequate. Also, Section 5.4.7.1.2 of the UFSAR states
that "no single active failure prevents at least one train of the SCS from
being aligned and operated from the control room either during a normal plant
cooldown or following an accident." This would include a natural circulation
cooldown following a loss of offsite power and the single failure of a diesel
generator. This event would require the batteries to operate to the point
where SDC can be initiated. The natural circulation cooldown test at San
Onofre showed that it would take 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> and 36 minutes to reach SDC entry
conditions from the.time that cooldown is commenced. The requirement for a
four hour soak prior to commencing cooldown would require that the batteries
operate for nearly 13 hours1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br />. Please explain how your eight hour battery
performance test demonstrates that the battery can meet these two design
requirements.
Sincerely,
Donald E. Hickman, Project Manager
Project Directorate V
Division of Reactor Projects -
III,
IV, V and Special Projects
cc: See next page
Mssrs. Baskin and Cotton
- 2 -
November 29, 1988
The HPSI pumps are then throttled until RCS pressure is reduced to the SDC
entry pressure. Next, all injection flow is shifted back to the cold legs and
SDC is initiated." Therefore, the batteries are required to operate for some
time greater than six hours to support SDC operation. It is not clear then
that the eight hour battery performance test which you described in your
corrective actions is adequate. Also, Section 5.4.7.1.2 of the UFSAR states
that "no single active failure prevents at least one train of the SCS from
being aligned and operated from the control room either during a normal plant
cooldown or following an accident." This would include a natural circulation
cooldown following a loss of offsite power and the single failure of a diesel
generator. This event would require the batteries to operate to the point
where SDC can be initiated. The natural circulation cooldown test at San
Onofre showed that it would take 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> and 36 minutes to reach SDC entry
conditions from the time that cooldown is commenced. The requirement for a
four hour soak prior to commencing cooldown would require that the batteries
operate for nearly 13 hours1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br />. Please explain how your eight hour battery
performance test demonstrates that the battery can meet these two design
requirements.
Sincerely,
original signed by
Donald E. Hickman, Project Manager
Project Directorate V
Division of Reactor Projects -III,
IV, V and Special Projects
cc:
See next page
DISTRIBUTION
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11O C88
11R/OP1/88
OFFICIAL RECORD COPY
Mr. Kenneth P. Baskin
San Onofre Nuclear Generating
Southern California Edison Company
Station, Units 2 and 3
cc:
Mr. Gary D. Cotton
Mr. Hans Kaspar, Executive Director
Senior Vice President
Marine Review Committee, Inc.
Engineering and Operations
531 Encinitas Boulevard, Suite 105
San Diego Gas & Electric Company
Encinitas, California 92024
101 Ash Street
Post Office Box 1831
San Diego, California 92112
Mr. Mark Medford
Southern California Edison Company
Charles R. Kocher, Esq.
2244 Walnut Grove Avenue
James A. Beoletto, Esq.
P. 0. Box 800
Southern California Edison Company
Rosemead, California 91770
2244 Walnut Grove Avenue
P. 0. Box 800
Mr. Robert G. Lacy
Rosemead, California 91770
Manager, Nuclear Department
San Diego Gas & Electric Company
Orrick, Herrington & Sutcliffe
P. 0. Box 1831
ATTN:
David R. Pigott, Esq.
San Diego, California 92112
600 Montgomery Street
San Francisco, California 94111
Richard J. Wharton, Esq.
University of San Diego School of
Alan R. Watts, Esq.
Law
Rourke & Woodruff
Environmental Law Clinic
701 S. Parker St. No. 7000
San Diego, California 92110
Orange, California 92668-4702
Charles E. McClung, Jr., Esq.
Attorney at Law
Mr. S. McClusky
24012 Calle de la Plaza/Suite 330
Bechtel Power Corporation
Laguna Hills, California 92653
P. 0. Box 60860, Terminal Annex
Los Angeles, California 90060
Regional Administrator, Region V
U.S. Nuclear Regulatory Commission
Mr. C. B. Brinkman
1450 Maria Lane/Suite 210
Combustion Engineering, Inc.
Walnut Creek, California 94596
7910 Woodmont Avenue, Suite 1310
Bethesda, Maryland 20814
Resident Inspector, San Onofre NPS
c/o U. S. Nuclear Regulatory Commission
Mr. Dennis F. Kirsh
Post Office Box 4329
U.S. Nuclear Regulatory Commission
San Clemente, California 92672
Region V
1450 Maria Lane, Suite 210
Walnut Creek, California 94596
Mr. Sherwin Harris
Resource Project Manager
Public Utilities Department
City of Riverside
City Hall
3900 Main Street
Riverside, California 92522