ML20132D668

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Forwards Insp Repts 50-361/96-17 & 50-362/96-17 on 961118- 22 & Notice of Violation
ML20132D668
Person / Time
Site: San Onofre  Southern California Edison icon.png
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)
v • d • e


See also: IR 05000361/1996017

Text

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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

.

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

PDR ADOCK 05000361

0 PDR

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Southern California Edison Co. -2-

to determine whether further enforcement action is necessary to ensure compliance with

regulatory requirements.

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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 l

them with you. I

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Sincerely, ,

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'homas P. Gwynn, Directo )

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Division of Reactor Safety

Docket Nos.: 50-361;50-362

License Nos.: NPF-10; NPF-15  ;

Enclosures: ,

1. Notice of Violation 1

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 i

San Diego, California 92101 l

1

Alan R. Watts, Esq.

Rourke & Woodruff I

701 S. Parker St. No. 7000 i

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. -3-

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 j

California Public Utilities Commission  !

505 Van Ness, Rm. 4102

San Francisco, California 94102

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DOCUMENT NAME: R:\_SO\SO617RP.MFR

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Branch Chief (DRP/TSS) M. Hammond (PAO, WCFO)

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DOCUMENT NAME: R:\_SO\SO617RP.MFR

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