ML20058L034

Ler.On 751117,while Preparing for Containment Leak Testing, Number 3 TIP Ball Valve Failed to Close Completely.Caused by Stuck Wiper on wafer-type Limit Switch.Valve Replaced

ML20058L034
Person / Time
Site:	Monticello
Issue date:	11/26/1975
From:	Nevinski D NORTHERN STATES POWER CO.
To:
Shared Package
ML20058L017	List: ML20058L013 ML20058L029 ML20058L031 ML20058L034 ML20058L045
References
LER-LER-751126-02, LER-LER-751126-2, NUDOCS 9105070360
Download: ML20058L034 (1)

Text

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57 58 59 60 61 66 69 74 75 80 EtEN1 DE SC Airm0N Q lWhile preparing for containment leak testing on November 13, 1975, No. 3 Tip Ball l

7 89 83

$ lealve failed to close co-pletelv, Redundant shea r valve ope rable.

The valve was l

7 89 80 Q l tapped, and it closed.

Investication revealed stuck wiper on a wafer-type limit l

7 89 80

@ buitch.

The valve was replaced. No previous similar occurrence (A0 50-263/75-25) l 7 ea eo D

1 l

- 69 80 m,

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coumus' causmic M DI Tt COMPCNE NT CODt 5JPI'L 8F I-MANu' ACTJt C 40 # O%

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' E9 10 11 12 17 43 44 47 48 CAUSE DESCAiPTON Q p wafer-type limit switch on No. 3 tip. ball valve stuck and prevented the valve f rom l 7 89 80 b!,cing.

valve m{c'd for GF by cen_ Pneumatics (CAT.

• 608 EO.T06).

The valve was l 7 89 80 E] l replaced.

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] l NOTE:

The event was determined to be an abnormal occurrence on 11/17/75, upcn com-l 7 69 ea 3 !nletic, of tN 11; and vac initially renorted on that date.

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