ML19259C068

LER 79-029/03L-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

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: ML17173A901 ML19259C068
References
LER-79-029-03L-02, LER-79-29-3L-2, NUDOCS 7906120313
Download: ML19259C068 (1)

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o 2 lWhile perfoming monthly surv. DIS 1400-3, PS 2-1430-1466D failed to trip. T.S. 4.5.A l ]

c 3 I and Table 3.2.2 requires trip at 50 < /= prf/ - 100 psig. Dresden setpt. is 95 +/- 5 l

[TTTl I psig. Safety significance minimal. Three redundant core spray pp. discharge press l

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[TT s l i Sw ' 8 operable and would have provided necessary permissive at 94.0 psig. Similar l

[TTii'l I ccurrences ref. in R.O. 78-031/03L-0 and 78-045/03L-0. l IO TTI I I o a i I

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]@ l S l 3 l 8 l 2 lg 44 47 CAUSE DESCRIPTION AND CCRRECTIVE ACTIONS h i o lCause was sticky plunger in pressure switch. Switch removed, cleaned, reset to trip  ;

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  ;

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, , ;further corrective action deemed necessary. l 2 4 I I 7 8 9 80 ST  % POWER OTHER STATUS IS O RY DISCOVERY DESCRIPTION 1 s W @ l 0l ll 8l@ l N/A l lBl@l Instrument Surveillance l AfTIVITY CO TENT RELEASED OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF HELEASE Q [_Z_j 7 8 9

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i0igl0lgl=<Sc 'PQ 2285 047 l 8 8 ,, ,2 83 LOSS OF On OAVAGE TO FACILITY O TYPE DESCRIPilON b "

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Gary L. Smith Ext. 421 y NAME OF PREPAREn - PHON E: o

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