ML13324A670
| ML13324A670 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 06/28/1985 |
| From: | Haynes J SOUTHERN CALIFORNIA EDISON CO. |
| To: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| NUDOCS 8507160561 | |
| Download: ML13324A670 (2) | |
Text
RtECEIVED Southern California Edison Company SAN ONOFRE NUCLEAR GENERATING STATION jw
-5 P14 12: 3 P.O. BOX 128 SAN CLEMENTE, CALI FORNIA 92672 J. G. HAYNES TELEPHONE STATION MANAGER (714) 492-7700 June 28, 1985 U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368 Attention:
Mr. J. B. Martin, Regional Administrator
Dear Sir:
Subject:
Docket No. 50-206 PASS Grab Sample Facility Status Report San Onofre Nuclear Generating Station, Unit 1
References:
- 1) Letter, H. B. Ray (SCE) to J. B. Martin (NRC),
dated October 9, 1984
- 2) Compliance Telephone Discussion, G. T. Gibson (SCE) with G. P. Yuhas (NRC), dated January 18, 1985 Pursuant to References (1) and (2), this is to inform you of maintenance activities being performed on the Reactor Coolant System Loop B & C grab sample facility isolation valve SV-3302. On May 9, 1985, SV-3302 was returned to service following completion of repairs to correct deficiencies in valve closure. On May 15, 1985, SV-3302 failed to open during sampling operations.
Since then, we have continued our investigation and maintenance on SV-3302.
On June 1, 1985, our investigation determined the failure of SV-3302 to open was due to valve binding when pressure exists across the valve. It was noted that when the line between SV-3302 and the upstream isolation valves (CV-955, CV-956) was depressurized, SV-3302 fully opened. By using special procedures involving entry into the sphere enclosure building to manually depressurize the line, samples were obtained on June 7, 1985. However, on June 21, 1985, when SV-3302 was retested, it failed to open and close. Since SV-3302 was determined not capable of automatic containment isolation, it has been maintained closed and the upstream inside containment isolation valves CV-955 and CV-956 were closed and deenergized. As a result, SV-3302 is inoperable for PASS.
8507160561 850628 PDR ADOCK 05000206 S
PDR 0-g
Mr. J. B. Martin
-2 We are in the process of procuring a new valve replacement for SV-3302.
Replacement of the valve will be accomplished as soon as practical.
If you require additional information, please so advise.
Sincerely, cc:
F. R. Huey (USNRC Senior Resident Inspector, Units 1, 2 and 3)
A. J. D'Angelo (USNRC Resident Inspector, Unit 1)
G. P. Yuhas (Radiation and Material Control Section Chief, Region V)
Institute of Nuclear Power Operations (INPO)