05000289/LER-1978-012-03, /03L-0:on 780406,during Functional Tests,One Snubber DHH-187 Would Not Lock Up Upon Compression.Cause Undetermined.Valve Block Replaced & Satisfactory Test Made

/03L-0:on 780406,during Functional Tests,One Snubber DHH-187 Would Not Lock Up Upon Compression.Cause Undetermined.Valve Block Replaced & Satisfactory Test Made

ML19261F232
Person / Time
Site:	Crane
Issue date:	05/05/1978
From:	METROPOLITAN EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19261F228	List: 05000289/LER-1978-012, Forwards LER 78-012/03L-0 05000289/LER-1978-012-03, /03L-0:on 780406,during Functional Tests,One Snubber DHH-187 Would Not Lock Up Upon Compression.Cause Undetermined.Valve Block Replaced & Satisfactory Test Made
References
LER-78-012-03L-01, LER-78-12-3L-1, NUDOCS 7910250655
Download: ML19261F232 (2)

LER-1978-012, /03L-0:on 780406,during Functional Tests,One Snubber DHH-187 Would Not Lock Up Upon Compression.Cause Undetermined.Valve Block Replaced & Satisfactory Test Made

Event date:
Report date:
2891978012R03 - NRC Website

text

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60 61 cQCKET NUMSER 64 69 EVENT DATE 74 75 RE#CRT DATE iJ EVENT DESCRIPT1oN AND PROBABLE CoNSECUENCEs h l I Durino functional testina of shock and sway suooressors (snubbers) in accordar.ce with l

l 1 the Technical Specifications, one snubber DHH-187 would not lock up upon compression, g

The limiting condition for operation during the event was 3.16.4, and the event is l

)1 The inoperable snubber could have caused an

) ; reportable per section 6.9.2.B(2).

) ; increase in the probability of structural damage to the piping resulting from a

) ; seismic or other, postulated event which initiates dynamic loads. However,thelikelihogd small.

Events of a similar nature: 78-11, 77-8, I

] I of such an event occurrina is very (Cont) 50 E

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] I The soecific reason why the snubber failed the comoression test has not been determined 4 The valve block was replaced l

] l Upon disassembly, two 0-rings were found to be damaged.

Pursuant to Tech. Specs., an additional 10 snubbers ;

3 l and a satisfactory test was made.

Snubber Data:

stroke; 5 in.

bore; 3/4 in

] [ were functionally tested satisfactorily.

Model flo. BE411.

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Cont'd

(Event Desc'Fiption and Probable Consequences) 76-41, 75-34, 75-09, 75-08, 75-03, 74-30, 74-25, 74-23, 74 4 0, 74_14, O

O i 481 203 f