05000237/LER-1979-029-03, /03L-0 on 790508:DIS 1400-3,pressure Switch 2-1430-1466D Failed to Trip.Caused by Sticky Plunger in Pressure Switch.Switch Removed,Cleaned & Reset to Trip at 94.5 Psig Increasing

/03L-0 on 790508:DIS 1400-3,pressure Switch 2-1430-1466D Failed to Trip.Caused by Sticky Plunger in Pressure Switch.Switch Removed,Cleaned & Reset to Trip at 94.5 Psig Increasing

ML19259C068
Person / Time
Site:	Dresden
Issue date:	06/05/1979
From:	Galen Smith COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A902	List: 05000237/LER-1979-029, Forwards LER 79-029/03L-0 05000237/LER-1979-029-03, /03L-0 on 790508:DIS 1400-3,pressure Switch 2-1430-1466D Failed to Trip.Caused by Sticky Plunger in Pressure Switch.Switch Removed,Cleaned & Reset to Trip at 94.5 Psig Increasing
References
LER-79-029-03L-02, LER-79-29-3L-2, NUDOCS 7906120313
Download: ML19259C068 (1)

LER-1979-029, /03L-0 on 790508:DIS 1400-3,pressure Switch 2-1430-1466D Failed to Trip.Caused by Sticky Plunger in Pressure Switch.Switch Removed,Cleaned & Reset to Trip at 94.5 Psig Increasing

Event date:
Report date:
2371979029R03 - NRC Website

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o 2 lWhile perfoming monthly surv. DIS 1400-3, PS 2-1430-1466D failed to trip.

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I and Table 3.2.2 requires trip at 50 < /= prf/ - 100 psig. Dresden setpt. is 95 +/- 5 l

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37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CCRRECTIVE ACTIONS h lCause was sticky plunger in pressure switch.

Switch removed, cleaned, reset to trip i

o g g at 94.5 psig increasing, and repeatability verified.

The Core Spray Pump Auto B'.Owdown; Permissive Pressure Switches will continue to be tested monthly using DIS 1400-3. No y,,,,

further corrective action deemed necessary.

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NAME OF PREPAREn PHON E:

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