ML20195G516
| ML20195G516 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 11/16/1998 |
| From: | Merschoff E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Rueger G PACIFIC GAS & ELECTRIC CO. |
| Shared Package | |
| ML20195G522 | List: |
| References | |
| 50-275-98-16, 50-323-98-13, EA-98-185, NUDOCS 9811230017 | |
| Download: ML20195G516 (5) | |
See also: IR 05000275/1998016
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UNITED S7ATES
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NUCLEAR REGULATORY COMMISSION
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REGION IV
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611 RYAN PLAZA DRIVE, SUITE 400
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NOV I 61998
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EA 98-185
Gregory M. Rueger, Senior Vice President
and General Manager
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Nuclear Power Generation Bus. Unit
Pacific Gas and Electric Company
Nuclear Power Generation, B14A
77 Beale Street, Room 1451
P.O. Box 770000
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San Francisco, Califomia 94177
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SUBJECT: NRC INSPECTION REPORT 50-275/98-16; 50-323/98-16 AND EXERCISE OF
Dear Mr. Rueger:
From September 13,1998 through October 24,1998, a routine inspection was conducted at
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your Diablo Canyon Nuclear Power Plant, Units 1 and 2 reactor facilities. The enclosed report .
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presents the scope and results of that inspection.
During the 6-week period covered by this inspection period, your conduct of activities at the
Diablo Canyon Nuclear Power Plant was generally characterized by safety-conscious
operations, sound engineering and maintenance practices, and good radiation protection
support
Based on the information developed during the inspection, one violation was identified. The
. violation involved the simultaneous inoperability of the Unit 2 Train A safety injection pump, the
Train A residual heat removal pump, and Valve 8923A, the Train A safety injection suction from
refueling water storage tank. This condition occurred for 14 hours1.62037e-4 days <br />0.00389 hours <br />2.314815e-5 weeks <br />5.327e-6 months <br /> 30 minutes in November
1989 (reference Licensee Event Report 50-323/95003-00) and rendered both trains of safety
injection inoperable for the long-term recirculation cooling mode.' Also, this condition existed
during maintenance of these components and resulted from a then-unrecognized
interdependency of cold leg recirculation suction flow paths between the emergency core
- cooling sptam trains. Pacific Gas and Electric Company (PG&E) engineers identified this
deficiency during a review of industry information in November 1995.~ We note that PG&E
performed an evaluation that demonstrated core cooling could have been provided by the Unit
2 Train B residual heat removal pump and two charging pumps.~ Therefore, this violation has
been categorized in accordance with the " General Statement of Policy and Procedure for NRC
Enforcement Actions (Enforcement Policy), NUREG-1600 at Severity Level Ill.
The condition was identified through review of historical records several years after occurrence
when licensee engineers were evaluating new industry information. Based on the age of the
issue, its isolated occurrence, the fact that it was not likely to be identified by routine licensee
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efforts, and the initiative demonstrated by the licensee to identify and promptly correct the
9811230017 981116
PDR. ADOCK 05000275
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Pacific Gas and Electric Company
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potential condition, the NRC has decided that enforcement action is not warranted for this
matter. Therefore, after consultation with the Director, Office of Enforcement, and in
accordance with Section Vll.B.6 of the NRC's Enforcement Policy, the NRC is exercising its
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enforcement discretion to not propose a civil penalty and to not cite a violation in this case.
In accordance with 10 CFR 2.790 of the NRC's " Rules of Practice," a copy of this letter and its
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enclosure will be placed in the NRC Public Document Room (PDR).
Should you have any questions concerning this inspection, we will be pleased to discuss them
with you.
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Sincerely,
/
Ellis W. Mersch f
Regional Administrator
Docket Nos.: 50-275
50-323
License Nos.: DPR-80
DPR-82
Enclosure:
NRC Inspection Report
50-275/98-16;50-323/98-16
cc w/ enclosures:
Dr. Richard Ferguson
Energy Chair
1100 lith Street, Suite 311
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Sacramento, California 95814
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Ms. Nancy Culver
S.an Luis Obispo Mothers for Peace
P.O. Box 164
Pismo Beach, Califomia 93448
Chairman
San Luis Obispo County Board of
Supervisors
Room 370
County Government Center
San Luis Obispo, California 93408
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Pacific Gas and Electric Company
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Mr. Truman Burns \\Mr. Robert Kinosian
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California Public Utilities Commission
505 Van Ness, Rm. 4102
Gan Francisco, California 94102
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Robert R. Wellington, Esq.
Legal Counsel
' Diablo Canyon Independent Safety Committee
85'7 Cass Street, Suite D
Monterey, California 93940
Mr. Steve Hsu
Radiologic Health Branch
State Department of Health Services
P.O. Box 942732
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Sacramento, California 94234
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Christopher J. Warner, Esq.
Pacific Gas and Electric Company
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P.O. Box 7442
San Francisco, California 94120
David H. Oatley, Vice President
Diablo Canyon Operations and Plant Manager
Diablo Canyon Nuclear Power Plant
P.O. Box 3
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,- Avila Beach, Califomia 93424
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Managing Editor
Telegram-Tribune
1321 Johnson Avenue
P.O. Box 112
San Luis Obispo, California 93406
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DOCUMENT NAME: R:\\_DC\\DC816RP.DLP
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