05000312/LER-1978-003-03, /03L-1 on 780710:Maintenance on Safety Sys Hydraulic Snubber Previously Found to Have Low Fluid Accumulator Level Revealed 2 Deteriorated o-rings Made W Polyurethene Seals Instead of ethylene-propylene Seals

/03L-1 on 780710:Maintenance on Safety Sys Hydraulic Snubber Previously Found to Have Low Fluid Accumulator Level Revealed 2 Deteriorated o-rings Made W Polyurethene Seals Instead of ethylene-propylene Seals

ML20147B334
Person / Time
Site:	Rancho Seco
Issue date:	07/10/1978
From:	Colombo R SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:
Shared Package
ML20147B330	List: 05000312/LER-1978-003-03, /03L-1 on 780710:Maintenance on Safety Sys Hydraulic Snubber Previously Found to Have Low Fluid Accumulator Level Revealed 2 Deteriorated o-rings Made W Polyurethene Seals Instead of ethylene-propylene Seals
References
LER-78-003-03L, LER-78-3-3L, NUDOCS 7810100077
Download: ML20147B334 (1)

LER-1978-003, /03L-1 on 780710:Maintenance on Safety Sys Hydraulic Snubber Previously Found to Have Low Fluid Accumulator Level Revealed 2 Deteriorated o-rings Made W Polyurethene Seals Instead of ethylene-propylene Seals

Event date:
Report date:
3121978003R03 - NRC Website

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UPDATE REPORT TO R,0, 78-03 L

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NRC FORM 366 U S. NU;,LE AR REGULATORY COMMISSION (7 77)

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F.E POR T D A T E 60 EVENT DESCRIPTION AND FROB ABLE CONSEQUENCES h lo1211 The original report (RO-78-03) described the discoverv of a low fluid I

I accumulator on a safety systen hydraulic snubber.

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a 3 10141I maintenance work on the snubber revealed two deteriorated "0-rings" in l

i 10151 L_the snubber valve body.

Subsequent analysis found the seals were 1

Lo_Ls J l nolvurethene rather than the proper material, ethylene propylene.

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40 el 42 dj 44 47 CAUSE DESCRIPTION AND CORREC GVE ACTIONS h g l All Bercen-Patterson snubbers were cricin,11v delivorod virh nnivornthnnnI 1i 11 1I seals.

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