ML20132D668
| ML20132D668 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 12/16/1996 |
| From: | Gwynn T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Ray H SOUTHERN CALIFORNIA EDISON CO. |
| Shared Package | |
| ML20132D671 | List: |
| References | |
| NUDOCS 9612200065 | |
| Download: ML20132D668 (5) | |
See also: IR 05000361/1996017
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UNITED STATES
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NUCLEAR REGULATORY COMMISSION
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REGloN IV
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611 RYAN PLAZA DRIVE, SulTE 400
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DEC l 61996
Harold B. Ray, Executive Vice President
Southern California Edison Co.
San Onofre Nuclear Generating Station
P.O. Box 128
San Clemente, California 92674-0128
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SUBJECT: NRC INSPECTION REPORT 50-361/96-17 50-362/9617 AND NOTICE OF
VIOLATION
Dear Mr. Ray:
An NRC inspection was conducted November 18-22,1996, at your San Onofre Nuclear
Generating Station, Units 2 and 3, reactor facilities. The enclosed report presents the
scope and results of that inspection. The overall results of this inspection were discussed
with Mr. G. Gibson on December 16,1996.
This inspection focused on the circumstances surrounding the mispositioning of valve
3MU995 (reactor coolant vent gas system orifice gate valve) and the followup of a
previous violation addressing the same valve. The inspection revealed a weakness in your
locked valve program that permitted a single procedural error to result in valve 3MU995
being inadvertently left open for approximately 1 year. During this time the reactor was
operated in modes where the reactor coolant gas vent system is designed to function.
Although the mispositioned valve did not render the reactor coolant gas vent system
inoperable, it placed the system in a degraded functional state and also increased the
probability of a small break loss of coolant accident.
The mispositioning of valve 3MU995 was identified as a violation of Technical Specification 6.8.1 (in effect at the time of the violation). Though generally meeting the
criteria of a noncited violation,.the violation is cited for two reasons: (1) you missed an
opportunity to earlier discover the mispositioned status of valve 3MU995, and (2) your
immediate corrective actions upon discovery of valve 3MU995 being open did not include
a comprehensive review of other valves that may have been similarly mispositioned.
The inspection also revealed that your corrective actions for the previous violation,
involving the failure to perform a 10 CFR 50.59 evaluation or update the Updated Final
Safety Analysis Report during the field change where an orifice was replaced with
valve 3MU995, were not sufficient for closu.e of this item.
The violation is cited in the enclosed Notice of Violation (Notice) and the circumstances
surrounding this violation is described in detail in the enclosed report. Please note that you
are required to respond to this letter and should follow the instructions specified in the
enclosed Notice when preparing your response. The NRC will use your response, in part,
9612200065 961216
ADOCK 05000361
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Southern California Edison Co.
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to determine whether further enforcement action is necessary to ensure compliance with
regulatory requirements.
in accordance with 10 CFR 2.790 of the NRC's " Rules of Practice," a copy of this letter,
its enclosure (s), and your response will be placed in the NRC Public Document Room
(PDR). To the extent possible, your response should not include any personal privacy,
proprietary, or safeguards information so that it can be placed in the PDR without
redaction.
Should you have any questions concerning this inspection, we will be pleased to discuss
them with you.
Sincerely,
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'homas P. Gwynn, Directo
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Division of Reactor Safety
Docket Nos.: 50-361;50-362
Enclosures:
2. NRC Inspection Report
50-361/96-17:50-362/96-17
cc w/ enclosures:
Chairman, Board of Supervisors
County of San Diego
1600 Pacific Highway, Room 335
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San Diego, California 92101
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Alan R. Watts, Esq.
Rourke & Woodruff
701 S. Parker St. No. 7000
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Orange, California 92668-4702
Sherwin Harris, Resource Project Manager
Public Utilities Department
City of Riverside
3900 Main Street
Riverside, California 02522
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Southern California Edison Co.
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R. W. Krieger, Vice President
Southern California Edison Company
San Onofre Nuclear Generating Station
P.O. Box 128
San Clemente, California 92674-0128
Dr. Harvey Collins, Chief
Division of Drinking Water and
Erivironmental Management
California Department of Health Services
P.O. Box 942732
Sacramento, California 94234-7320
Terry Winter, Manager
Power Operations
San Diego Gas & Electric Company
P.O. Box 1831
San Diego, California 92112
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
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California Public Utilities Commission
505 Van Ness, Rm. 4102
San Francisco, California 94102
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Leah Tremper (OC/LFDCB, MS: TWFN 9E10)
DOCUMENT NAME: R:\\_SO\\SO617RP.MFR
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