ML20210T274
| ML20210T274 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 09/10/1997 |
| From: | Howell A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Ray H SOUTHERN CALIFORNIA EDISON CO. |
| Shared Package | |
| ML20210T281 | List: |
| References | |
| 50-361-97-15, 50-362-97-15, EA-97-414, NUDOCS 9709150036 | |
| Download: ML20210T274 (6) | |
See also: IR 05000361/1997015
Text
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ARLINGTON, TE XAS 760118064 -
September 10,1997
EA 414
Harold B. Ray, Executive Vice President
Southern Californie Edison Co.
San Onofre Nuclear Generating Station
P.O. Box 128
San Clemente, California 92674 0128
kJBJECT: NPC INSPECTION "3
ST 50-361/9715; 50 362/9715 AND NOTICE OF
VIOLATION
Dear Mr. Ray:
l
An NRC inspection was conducted onsite June 30 through July 3,1997, at your San
Onofre Nuclear Generating Station, Units 2 and 3, reactor facilities, as a result of the
identification during the Units 2 and 3 Cycle 9 refueling outages of recurring through wall _
cracking in inconel 600 reactor coolant system nozzle penetrations. Additional in-office
and onsite inspection was performed during July 25 through September 2,1997. The
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additional inspection included review of a July 22,1997, letter from your staff pertaining
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to compliance with Criterion XVI of Appendix B to 10 CFR Part 50. The July 22,997,
letter has been included as Attachment 2 to the inspection report. Presentations made by
your t.taff during a meeting in the Region IV office on August 21,1997, have been-
included as Attachments 3 and 4__to the inspection report._ The enclosed report pr9sents -
the scope and results of this inspection.
The inspection identified one violation pertaining to the placing of the Unit 3 reactor
coolant system in a 10_ CFR 50.65(a)(2) category as of July 10,1996, despite the
identification in 1995 of through wall cracking in four reactor coolant system norrie
pene: rations.
The volation is cited I, die enclosed Notice of Violation (Notice) and the circumstances
surrounding the violat;on are described in detailin 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,
_
to determine whether further enforcement action is necessary to ensure compliance with _
regulatory requirements,
b
9709150036 970910
-PDR - ADOCK 05000361
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,
.
.
Southern California Edison Co.
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The results of the inspection indicate that refueling outage inspections have identified
recurring through wall cracking in inconel 600 reactor coolant system nozzle penetrations,
with the predominant degradation mechanism determined to be primary water stress
corrosion cracking. While you have conducted repairs upon identification of cracking in
individual nozzle penetrations, we consider your overall response to be of concern.
Specifically, your current approach to this degradation issue allows the potential for reactor
- coolant system pressure boundary leakage to occur during Mode 1 power operations, a
condition not permitted by sour Technical Specifications. We further note that repetitive
,
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f ailures have occurred in individua! heats of Inconel 600 alloy nozzle penetrations,
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indicating certain heats of material are particularly susceptible to primary water stress
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corrosion cracking.
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Based on the resulta of this inspection, one apparent violation was also identified and is
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being considered for escalated enforcement action in accordance with the " General
Statement of Policy and Procedure for NRC Enforcement Actions" (Enforcement Policy),
NUREG 1600. Accordingly, no Notice of Violation is presently being issued for this
inspection finding. The apparent violation involved the failure to implement actions to
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preclude recurrence of Heat NX7630 nozzle penetration cracking in accordance with the
!
requirements of Criterion XVI of Appendix B to 10 CFR Part 50. In addition, please be
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advised that the number and characterization of the apparent violation described in the
enclosed inspection report may change es a result of further NRC review,
1
A predecisional enforcement conference to discuss this apparent violation has been
scheduled for September 24,1997, at 1 p.m. CDT. The decision to hold a predecisional
enforcement conference does not mean that the NRC has made a final determination that a
violation has occurred or that enforcement action will be taken. This conference is being
held to ubtain information to enable the NRC to make an enforcement decision, such as a
common understanding of the facts, root causes, missed opportunities to identify the
apparent violation sooner, corrective actions, significance of the issues and the need for
lasting and effective corrective action, in addition, this is an opportunity for you to point
out any errors in our inspection report and for you to provide any information concerning
your perspectives on 1) the severity of the apoarent violation, 2) the application of the
factors that the NRC considers when it determines the amount of a civil penalty that may
be assessed in accordance with Section VI.B.2 of the Enforcement Policy, and 3) any other
application of the Enforemnent Policy to this case, including the exercise of discretion in
accordance with Section Vll. This conference will be open to public observation in
accordance with the Enforcement Policy.
You will be advised by separate correspondence of the results of our deliberations on this
matter No response regarding the apparent violation is required at this time,
in accordance with 10 CFR 2.790 of the NRC's " Rules of Practice," a copy of this letter
and its enclosure will be placed in the NRC Public Document Room (PDR).
.
.
'
Southern California Edison Co.
3
Should you have any questions concerning this inspection, we will be pleased to discuss
them with you.
Sincerely,
1
[1
.
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h Art ur T. HowellIll, Director
Division of Reactor Safety
1
Docket Nos.: - 50 361; 50 362
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License Nos.: NPF 10; NPF 15
Enclosure:
NRC Inspection Report
-50 361/97 15;50 362/97 15
4
cc w/ enclosures:
Chaltman, Board of Supervisors
County of San Diego
1600 Pacific Highway, Room 335
San Diego, California 92101
Alan 'c . Watts, Esq.
Woodruff, Spradlin & Smart
701 S. Parker St. Suite 7000--
Orange, California 92868-4720
Sherwia Harris, Resource Project Manager
Public Utilities Department
City of Riverside
3900 Main Street -
Riverside, California 92522
R. W. Krieger, Vice President
- Southern Californla Edison Company
- San Onofre Nuclear Generating Station
- P.O. Box 128
San Clemente, California 92674 0128
.
.
Southern California Edison Co.
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Dr. Harvey Collins, Chief
Division of Drinking Water and
Environmental Management
California Department of Health Services
P.O. Box 942732
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Sacramento, California 94234 7320
Terry Winter, Manager
Power Operations
San Diego Gas & Electric Company
P.O. Box 1831
San Diego, California 92112
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Mr. Steve Hsu
Radiological Health Branch
State Department of Health Services
P.O. Box 942732
Sacramento, California 94234
Mayor
City of San Clemente
100 Aven:da Presidio
San Clemente, California 92672
Mr. Truman Burns \\Mr. Robert Kinosian
California Public Utilities Commission
505 Van Ness, Rm 4102
San Francisco, California 94102
.
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Southern California Edison Co.
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