05000312/LER-1981-050, Forwards LER 81-050/03L-0.Detailed Event Analysis Submitted

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Forwards LER 81-050/03L-0.Detailed Event Analysis Submitted
ML20032A537
Person / Time
Site: Rancho Seco
Issue date: 10/14/1981
From: Mattimoe J
SACRAMENTO MUNICIPAL UTILITY DISTRICT
To: Engelken R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20032A538 List:
References
NUDOCS 8110300312
Download: ML20032A537 (2)
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LER-1981-050, Forwards LER 81-050/03L-0.Detailed Event Analysis Submitted
Event date:
Report date:
3121981050R00 - NRC Website
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SACRAMENTO MUNICIPAL UTILITY DISTRICT O 6201 :S Street. Box 1500, Sacramento, Califomia 9581E](916) 452-3211 -

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October 14, 1981

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REGION V 0FFICE OF INSPECTION-f..ENFDPCEMENT

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4 Ik ~H ENGELKEN,J DIRECTOR'.

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REPORTABLE OCCURRENCE 81-50

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In accordance with Technical Specifications for Pancho Seco Nuclear i

Generating Station, Section 6.9.4.2.b and Regulatory. Guide 1.16,-

l Revision 4, Section C.2.b(2), the Sacramento Municipal Utility District is hereby submitting a thirty-day report of Peportable Occurrence'81-50.

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On September' 30,.1981', while performing SP' 205.07C, ' Isolation valve Surveillance Test, SFV-46204 failed 'to stroke closed. Upon inspection,-

water and rust was found in.the ASCO 8302C-29-RG solenoid valve.

This i

had caused the solenoid to fail to provide air to stroke the valve.

This valve

, located at a low point.in'the. Instrument Air System.

4 As an immediate corrective action, the so'inoid was cleaned and was

found to satisfactorily stroke the valve within the 18-second limit.

Actual values were six-seconds to close, 12 seconds to open.

Additicnal_ action?is'being undertaken to insure that water-does not accumulate at low points <in the' Auxiliary building as follows:

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A new prevent'ative: maintenance program to change out the Instrument-Air ~ System filtersion alorie-set per month basis was started. This i

program wi'll be evaluated' periodically and at the end of six months.to determine;i f i t needs to. cont inue or be al tered 'In any I

respect.

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A de'w point.senser has been installed in the instrument. air line after the instrument ~ ai r dryer. The sensor is temporarily wi red now, with operations personnel conducting a shiftly surveillance on the indicator. This sensor will be permanently wired within ninety days and an alarm will be annunciated in the control room.

The.surveillances will continue until this is completed.

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' A N D E L E C T R I C' ~s Y S T E M 'S E R VI N G MORE 'T H A N. - 6 0 0,0 0 0. t N ' T H E-HEART OF C A tlF O R N I A

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R. H. Engelken October 14, 1981 3

The l&C department. preventative maintenance program will include a provision for blowing down the Instrument Air in the Auxiliary Building every two weeks for the next six months. The results of this effort will be reviewed periodically and at the end of six months to determine the necessity of continuing to blow down, or if other measures are required to remove moisture buildup. This valve is located In'the cooling coil decay heat return line; reference drawing M-543 There were no plant transients or power reductions associated with this item, nor will the current plant outage be extended by it.

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L ohn J. Mattimoe

~ Assistant General Manager and Chief Engineer cc:

IsE Washington (30)

MIPC (3)

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