ML13322B197
| ML13322B197 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 07/30/1990 |
| From: | Tatum J Office of Nuclear Reactor Regulation |
| To: | Ray H SOUTHERN CALIFORNIA EDISON CO. |
| References | |
| NUDOCS 9008020238 | |
| Download: ML13322B197 (2) | |
Text
July 30, 1990 Docket No. 50-206 DISTRIBUTION Docket File NRC & LPDRS BBoger DFoster OGC-WF PD5 Plant File Mr. Harold B. Ray EJordan (3302) BGrimes (9A2)
Senior Vice President ACRS (10)
JTatum (2)
Southern California Edison Company RHermann (14D20)
Irvine Operations Center MHum (7D4)
CSellers (7D4) 23 Parker Irvine, California 92718
Dear Mr. Ray:
SUBJECT:
VERIFICATION OF PRESSURIZER INTEGRITY, SAN ONOFRE NUCLEAR GENERATING STATION, UNIT NO. 1 During a meeting with members of your staff at San Onofre on June 12, 1990, I discussed the results of recent pressurizer inspections that were conducted at the Haddam Neck plant by the licensee, Connecticut Yankee Atomic Power Company (CYAPCO). CYAPCO discovered that the internal cladding surface of the pressurizer contained a multitude of hairline cracks in the vicinity of the lower head.
Three of the cracks penetrated the pressurizer base metal, one of which required detailed evaluation to satisfy ASME Code requirements for resolution.
Based on discussions with Westinghouse, it is our understanding that the San Onofre Unit 1 pressurizer is of the same design as the Haddam Neck pressurizer.
Because a loss of pressurizer integrity could pose a significant safety hazard during plant operation, we believe that actions should be taken to assure that cracks do not exist in the San Onfore Unit 1 pressurizer. Therefore, you are requested to provide a description of the actions that you have taken to address our concern, including your assessment of the current state of pressurizer integrity. Please provide your response prior to return to service from the current Cycle 11 refueling outage.
The reporting and/or recordkeeping requirements contained in this letter affect fewer than ten respondents; therefore, OMB clearance is not required under Pub L.96-511.
Please contact us if you should have any questions regarding this request.
Sincerely, Original Signed By:
James E. Tatum, Project Manager Project Directorate V Division of Reactor Projects -
- III, IV, V and Special Projects Office of Nuclear Reactor Regulation cc:
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Mr. Harold B. Ray San Onofre Nuclear Generating Southern California Edison Company Station, Unit No. 1 cc David R. Pigott Mr. Richard J. Kosiba, Project Manager Orrick, Herrington & Sutcliffe Bechtel Power Corporation 600 Montgomery Street 12440 E. Imperial Highway San Francisco, California 94111 Norwalk, California 90650 Mr. Robert G. Lacy Mr. Phil Johnson Manager, Nuclear U.S. Nuclear Regulatory Commission San Diego Gas & Electric Company Region V P. 0. Box 1831 1450 Maria Lane, Suite 210 San Diego, California 92112 Walnut Creek, California 94596 Resident Inspector/San Onofre NPS U.S. NRC P. 0. Box 4329 San Clemente, California 92672 Mayor City of San Clemente San Clemente, California 92672 Chairman Board of Supervisors County of San Diego 1600 Pacific Highway Room 335 San Diego, California 92101 Regional Administrator, Region V U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Mr. John Hickman Senior Health Physicist Environmental Radioactive Management Unit Environmental Management Branch State Department of Health Services 714 P Street, Room 616 Sacramento, California 95814 Mr. Don Womeldorf Chief, Environmental Management California Department of Health 714 P Street, Room 616 Sacramento, California 95814