ML13331A154
| ML13331A154 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 09/18/1981 |
| From: | Nowicki S Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8109250017 | |
| Download: ML13331A154 (23) | |
Text
'o UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 September 18, 1981 LICENSEE:
SOUTHERN CALIFORNIA EDISON COMPANY FACILITY:
San Onofre Unit No. 1
SUBJECT:
MEETING
SUMMARY
OF SEPTEMBER 15, 1981 On September 15, 1981 members of the NRC staff met with representatives of Southern California Edison Co. and their consultants to discuss the September 3, 1981 event at San Onofre Unit 1. During this event, two safety injection discharge valves did not operate as designed. A list of attendees is enclosed along with copies of the viewgraphs presented by SCE.
The valves that failed to operate properly are hydraulically operated 14" double.disc wedge type gate valves. The licensee concluded that the pressure differential across the gate was sufficient to prevent the valves from opening. Subsequent lapping of the galled valve faces resulted in them operating when first retested but then failing to meet the design operating time on subsequent tests.
The licensee proposed corrective actions that they feel will resolve the problem. These actions principally involved tripping the feedwater (ECCS) pump on a safety injection signal to reduce the pressure on the upstream side of the disc of the affected valves.
The pump would be restarted within five seconds after the pressure decayed sufficiently to assure valve operation. Other actions include revised valve sequencing, steps to equilize pressure across discs and between lines and pressure limits on piping downstream of the valves.
The licensee indicated that they expected to be able to return the unit to service on September 24, 1981, since all modifications would be completed and licensee reviews would be completed by then.
The staff indicated to the licensee that they had some concerns associated with the proposal.
Included in these concerns is the potential added risk of stopping and restarting the feedwater (ECCS) pumps, the affect on the ECCS water and the startup and surveillance testing of the modified system.
The staff expects that additional discussions related to these matters will occur.
Stanley J.icki, Project Manager Operating Reactors Branch #5 Division of Licensing
Enclosures:
As stated cc w/enclosures:
See next page 8109250017 8109181 PDR ADOCK 05000206 PDR
2 -
September 18, 1981 cc Charles R. Kocher, Assistant Mr. R. Dietch General Counsel Vice President James Beoletto, Esquire Nuclear Engineering and Operations Southern California Edison Company Southern California Edison Company Post Office Box 800 2244 Walnut Grove Avenue Rosemead, California 91770 Post Office Box 800 Rosemead, California 91770 David R. Pigott Orrick, Herrington & Sutcliffe 600 Montgomery Street San Francisco, California 94111 Harry B. Stoehr San Diego Gas & Electric Company P. 0. Box 1831 San Diego, California 92112 Resident Inspector/San Onofre NPS c/o U. S. NRC P. 0. Box 4329 San Clemente, California 92672 Mission Viejo Branch Library 24851 Chrisanta Drive Mission Viejo, California 92676 Mayor City of San Clemente San Clemente, California 92672 Chairman Board of Supervisors County of San Diego San Diego, California 92101 California Department of Health ATTN:
Chief, Environmental Radiation Control Unit Radiological Health Section 714 P Street, Room 498 Sacramento, California. 95814 U. S. Environmental Protection Agency Region IX Office ATTN:
Regional Radiation Representative 215 Freemont Street San Francisco, California 94111
LIST OF ATTENDEES DCrutchfi el d NRR LMiller NRC AJohnson NRC KBaskin SCE RKrieger SCE MKalsi Kalsi Engineering, Inc.
RVerbeck SCE BMoreton Bechtel THerring SCE KWichman NRC RWoods NRC FAsh AEOD BMills NRC GLainas NRC EBrown.
AEOD HOrnstein AEOD WLanning NRC
AGENDA NRC/SCE MEETING REVIEW OF SEPTEMlBER 3, 1981 SAFETY INJECTION ACTUATION INCIDENT SEPTEMBER 15, 1981
- 1. Introduction
- 2. Safety Injection System Configuration and Operation
- 3.
Sequence of Events During September 3, 1981 Incident
- 4. Investigation and Evaluation to Determine Cause of Safety Injection Valves Not Opening and Corrective Actions Required
- 5. Evaluation of Other Safety Injection Valves and Corrective Actions Required
- 6. Implementation of Corrective Actions
- 7.
Evaluation of the Acceptability of Corrective Actions
- 8.
Schedule for Completion of Corrective Actions and Return to Power
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MEETING
SUMMARY
DISTRIBUTION Docket NRC PDR PDR Local ORB Reading JOsihinski JHeltemes SVarga TIppolito RClark JStolz SNowicki OELD OI&E (3)
HSmith ACRS (10)
NSIC DCrutchfield LMiller AJohnson KWichman RWoods BMills GLianas WLanning OFFICE)
LD A#
DL:
SURNAME)
SNwk:cc D r* h IE 1 d DATE NRC FORM 318110/80) NRCM 0240 OFFICIAL RECORD COPY