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

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

ML20062E717
Person / Time
Site:	San Onofre
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: 05000361/LER-1982-035, Forwards LER 82-035/03L-0.Detailed Event Analysis Submitted 05000361/LER-1982-035-03, /03L-0:on 820610,steam Found Leaking Through 2HV-8421 Mainsteam Atmospheric Dump Valve.Cause Not Stated. Personnel Unable to Duplicate Anomaly.Semiannual Subgroup Relay Test Performed on Controller,Relays & Actuator
References
NUDOCS 8208100297
Download: ML20062E717 (2)

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

Event date:
Report date:
3611982035R00 - NRC Website

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I RECDVE9 IPO Southern California Edison Company DR M 39, h 5 v On S AN ONOFRE NUCLE AR GENER A TlNG S T A TION P4.SOK 128

$ AN C LEMENT E. C A LIFOR NI A 92672

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

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U. S. Nuclear Regulatory Commission j

Office of Inspection and Enforcement 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 of the dates upon which the event had occurred.

4 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 by l&C and Mechanical Maintenance personnel. Af ter trouble shooting and i

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