05000361/LER-1982-035, Forwards LER 82-035/03L-0.Detailed Event Analysis Submitted

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Forwards LER 82-035/03L-0.Detailed Event Analysis Submitted
ML20062E717
Person / Time
Site: San Onofre Southern California Edison icon.png
Issue date: 07/22/1982
From: Ray H
SOUTHERN CALIFORNIA EDISON CO.
To: Engelken R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20062E720 List:
References
NUDOCS 8208100297
Download: ML20062E717 (2)


LER-2082-035, Forwards LER 82-035/03L-0.Detailed Event Analysis Submitted
Event date:
Report date:
3612082035R00 - NRC Website

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RECDVE9 IPO Southern California Edison Company DR M 39 , h 5 l S AN ONOFRE NUCLE AR GENER A TlNG S T A TION v On '

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H. S. R AY vettawoNs-svanoN =aNaara July 22, 1982 en ... u.,,..

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! U. S. Nuclear Regulatory Commission j Office of Inspection and Enforcement l Region V 1450 Maria Lane, Suite 210 Walnut Creek, Cal i fornia 92596-5368 Attention: Mr. R. H. Engelken, Regional Administrator

Dear Sir:

Subject:

Docket No. 50-361 l 30-Day Report

, Licensee Event Report No.82-035 i

San Onofre Nuclear Generating Station, Unit 2

Reference:

Letter, H. B. Ray (SCE) to R. H. Engelken (NRC),

dated July 2, 1982 The referenced letter confirmed our prompt notification of your of fice

! of our failure to provide Licensee Event Reports (LER's) within 30 days 4

of the dates upon which the event had occurred.

Pursuant to Technical Specification 6.9.1.13.b, to Operating License NPF-10 for San Onofre Unit 2, this submittal provides the required 30 day written report and copy of LER form, for an event involving the i

Mainsteam Atmospheric Dump Valve.

On June 10, 1982, while in Mode 3, steam was observed leaking through the Mainsteam Atmospheric Dump Valve, 2HV-8421, with the valve in the indicated full closed position. In accordance with Technical Specification 3.6.3, this valve was declared inoperable. The associated Action Statement c requires that isolation of the affected penetration, by use of at least one closed manual valve or blind flange be achieved within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />. This was accomplished by closing the upstream manual block valve, S21301MU001. The inoperability of valve 2HV-8421 was investigated i by l&C and Mechanical Maintenance personnel. Af ter trouble shooting and j

cycling of the valve and actuators, the valve was returned to service.

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Mr. R. H. Engelken July 22, 1982 To establish operability, the section of the Semi-Annual Subgroup Relay Test, (Operator Surveillance Test S023-3-3.43) which tests the controller, relays, actuator and 2HV-8421 valve functions, was performed. All components functioned properly and operability was reestablished within 18 hours2.083333e-4 days <br />0.005 hours <br />2.97619e-5 weeks <br />6.849e-6 months <br /> of the event identification.

A completed LER form is enclosed.

If there are any questions regarding the above, please contact me.

Sincerely, 6

Enclosure:

LER No.82-035 cc: Mr. A. E. Chaffee (USNRC Resident inspector, San Onofre Unit 2)

U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Of fice of Managemoni information & Program Control Institute of Nuclear Power Operations