ML20238F858
| ML20238F858 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 08/28/1998 |
| From: | Dyer J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Ray H SOUTHERN CALIFORNIA EDISON CO. |
| References | |
| 50-361-97-22, 50-362-97-22, EA-98-035, EA-98-35, EA-98-418, NUDOCS 9809080008 | |
| Download: ML20238F858 (4) | |
See also: IR 05000361/1997022
Text
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UNITED STATES
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NUCLEAR REGULATORY COMMISSION
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REGION IV
611 RYAN PLAZA DRIVE, sulTE 400
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ARLINGTON, TEXAS 76011-8064
August 28,1998
EA 98-035 '
EA 98-418
Harold B. Ray, Executive Vice President
' Southern California Edison Co.
San Onofre Nuclear Generating Station
P.O. Box 128
San Clemente, California 92674-0128
SUBJECT:
RESPONSE TO ADDITIONAL INFORMATION RELATED TO NRC
INSPECTION REPORT 50-361/97-22; 50-362/97-22 AND DENIAL OF NOTICE
OF VIOLATION
Dear Mr. Ray:
This is in reference to your letter dated July 14,1998, in which the Southern California
Edison Co. (SCE) provided additional information in response to our May 11,1998,
letter requesting additional information relative to SCE's denial of a violation of 10 CFR 50.65,
" Requirements for Monitoring the Effectiveness of Maintenance at Nuclear Power Plants."
Violation 50-361;-362/9722-01 pertained to SCE's failure to include in the scope of Maintenance
. Rule program, the San Onofre Nuclear Generating Station, Units 2 and 3, nonradioactive
sumps system. Manipulation of the sump lineup was required in the emergency operating
instructions that addressed a steam generator tube rupture (SGTR) event.
As a result of our review of your response to our request for additionalinformation, we have
determined that SCE provided additional relevant information beyond what was obtained during
the onsite inspection. Our review of the additional information led us to conclude that the
significance of the nonradioactive sump system contribution to release mitigation was not
sufficient to require being added to the scope of your Maintenance Rule program. Specifically,
this information includes: (1) the SGTR emergency operating instruction (EOl) includes actions
to mitigate offsite exposure by reducing an atmospheric release; however, sump operations is
not one of the offsite dose mitigation steps; (2) the EOl mitigates offsite exposure by directing
the steam from the affected steam generator to the condenser; (3) the amount of leakage to the
sumps from the condenser or its discharge piping following a SGTR event would likely
represent only a small fraction of the total sump volume and, therefore, be contained entirely
within the sump; and (4) even if there were significantly more leakage from the condenser or its
discharge piping (i.e., beyond the design basis evaluation) such that this leakage was not
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contained within the sump, the resulting airborne release would be significantly less than the
airborne release from a main steam safety valve, as analyzed in the Updated Final Safety
Analysis Report for the SGTR event.
9909090008 990828
ADOCK 05000361
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Southern California Edison Co.
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Accordingly, we agree with your position that there was no violation of regulatory requirements.
Violation 50-361;-362/9722-01 is hereby withdrawn. If you have any questions regarding this
matter, please contact Dr. Dale Powers at 817/860-8195.
Sincerely,
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James . Dyer
Deputy Regional Admin!strator
Docket Nos.: 50-361;50-362
cc:
Chairman, Board of Supervisors
County of San Diego
1600 Pacific Highway, Room 335
San Diego, Califomia 92101
Alan R. Watts, Esq.
Woodruff, Spradlin & Smart
701 S. Parker St. Suite 7000
Orange, California 92868-4720
Sherwin Harris, Resource Project Manager
Public Utilities Department
Cityof Riverside
3900 Main Street
Riverside, California 92522
R. W. Krieger, Vice President
Southern California Edison Company
San Onofre Nuclear Generating Station
P.O. Box 128
San Clemente, California 92674-0128
Stephen A. Woods, Senior Health Physicist
Division of Drinking Water and
Environmental Management
Nuclear Emergency Response Program
California Department of Health Services
P.O. Box 942732, M/S 396
Sacramento, Califomia 94334-7320
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Southern California Edison Co.
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Mr. Gary D. Cotton, Sr. Vice President
Energy Supply
San Diego Gas & Electric Company
P. O. Box 1831
San Diego, California 92112-4150
- Mr. Steve Hsu
, Radiological Health Branch
State Department of Health Services
P.O. Box 942732
Sacramento, California 94234
Mayor
City of San Clemente
100 Avenida Presidio
San Clemente, California 92672
Mr. Truman Burns \\Mr. Robert Kinosian
Califomia Public Utilities Commission
505 Van Ness, Rm. 4102
San Francisco, California 94102
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