05000312/LER-1982-002, Forwards LER 82-002/03L-0.Detailed Event Analysis Submitted

Forwards LER 82-002/03L-0.Detailed Event Analysis Submitted

ML20041E357
Person / Time
Site:	Rancho Seco
Issue date:	02/24/1982
From:	Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Englken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20041E358	List: 05000312/LER-1982-002, Forwards LER 82-002/03L-0.Detailed Event Analysis Submitted 05000312/LER-1982-002-03, /03L-0:on 820130,snubbers 1SW-21007-7 & 1SW-23823-13A Failed Visual Insps.Caused by Low Fuel Level. Snubber 1SW-21007-7 Rebuilt & Passed.Snubber 1SW-23823-13A Failed Until Bechtel Developed New Criteria
References
NUDOCS 8203100411
Download: ML20041E357 (2)

LER-1982-002, Forwards LER 82-002/03L-0.Detailed Event Analysis Submitted

Event date:
Report date:
3121982002R00 - NRC Website

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$SMUD SACRAMENTO MUNICIPAL UTILITY DISTRICT O 6201 s street, Box 15830, sacramento, California 95813; (916) 452-3211 m

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9 R H ENGELKEN, P.EGIONAL ADfilNISTRATOR 3

PEGION V 0FFICE OF INSPECTION & ENFORCE!'ENT G~'A U S NUCLEAR REGULATORY COMMISSION

'N 1450 f! ARIA LANE SUITE 210 v.

s WALHUT CPEEK CA 94596

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{p DOCKET NO. 50-312 i

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LICENSE NO. DPR-Se

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REPORTABLE OCCURPENCE NO. 82-02 N,

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In accordance with Pancho Seco Nuclear Generating Station ~ Technical Specification Sections 6.9.4.2.b, 3.12, and 4.14 and Depulatory Guide 1.16, Section C.2.b(2), the Sacramento Municipal Utility District is hereby submitting the followino 30-day report of Licensee Event Report number 82-02.

On January 30, 1982, during a routine shutdown to conduct snubber inspection, two snubbers were found to fail their visual inspection criteria on low fluid level. These were snubber numbers ISW-23823-13A and ISW-21007-7, both on the Seal Injection and fiakeup System.

Both snubbers were manufactured by Grinnell.

Snubber ISW-21007-7 was rebuilt and passed its functional test.

Snubber ISW-23823-13A was also rebuilt but it failed its functional test due to a low bleed rate. Additional attempts to rebuild the snubber still failed to produce an acceptable bleed rate.

Since the criteria used for snubber 1SU-23823-13A was the ceneral manu-facturer's criteria and did not take into account the actual in-plant application of the snubber, Bechtel was requested to perform an evaluation to develop specific criteria for this snubber. The snubber was able to satisfy the new criteria and was declarad operable.

There are a number of Class I safety grade snubbers that do not have specific criteria for their as-installed applications. The District has requested Bechtel to develop these criteria to ensure that this type of event does not recur.

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R. H. Engelken February 24, 1982 In addition, pursuant to Rancho Seco Technical Specification Section 4.14.1, the snubber inspection interval has been set at six months

(+ 25%).

There were no transients associated with this event since the unit was in hot standby during the inspection, nor was the outage extended by

bis event.

Plant and public safety were not affected.

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ohn J. Mattimoe Assistant General f'anager and Chief Engineer cc:

I&E Washington (30)

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