ML19323F275

LER 80-011/03L-0:on 800420,while Performing Manual Operation of Relief Valves,Valve 2-203-3C Failed to Open.Caused by Component Failure Due to Excessive Solenoid Plunger to Pilot Valve Stem Clearance

ML19323F275
Person / Time
Site:	Quad Cities
Issue date:	05/16/1980
From:	Eagle J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19323F269	List: ML19323F268 ML19323F275
References
LER-80-011-03L-04, LER-80-11-3L-4, NUDOCS 8005280719
Download: ML19323F275 (2)

Text

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h iTTT] i While performing the Manual Operation of Relief Valves, procedure QOS 201-1, relief l ITTT1 I valve 2-203-3C failed to open (TS 3.5.D.2.). In accordance with Technical Specificatiod ITTT1 14. 5. D. 2 HPCI had been demonstrated to be operable. All other electromatic relief I l0Isj l valves and the Target Rock safety / relief valve were demonstrated to be operable. l DITs I i 1 f7FTl i I I

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i l u l l The cause of this event was ccynent failure due to excessive solenoid plunger-to- 1 i i l pilot valve stem clearance. solenoid plunger-to- $i. lot valve stem clearance was I g i adjusted, the valve was successfully operated three times. I Li_L_J l I LLL.J l I 7 8 9 80 ST S  % POWER OTHER STATlas IS O RY OtSCOVERY DESCRIPTION li 1 5 l l,.C__j @ l0 l0l0l@l NA l l"B l@l Routine Test l ACTIVITY COTTENT RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE tmJ' Lz._]

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1. LER NUMBER: LER/R0 80-fl/03L

11. LICENSEE NAME: Commonwealth Edison Company Quad-Cities Nuclear Power Station 111. FACILITY NAME: Unit Two IV. I)0CKET NUMBER: 050-265 V. EVENT DESCRIPTION:

On April 20, 1980, while performing Manual Operation of Relief Vr* ss, procedure QOS 201-1, relief valve 2-203-3C failed to open. Work quest to 4775 was written to replace the valve. In accordance with Technical Speci fication 4.5.D.2. , HPCI had been demonstrated to be operable.

VI. PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The effect of one electromatic relief valve falling to open was min!-

mized by the fact that the other relief valves were operaole and at no time were any design limits exceeded. All other emergency core cooling systems were available during the time of this occurrence to supply water to the reactor vessel. Therefore, saic operation of the reactor was not affected as a result of this occurrence.

Vll. CAUSE:

The failure of the 2-203-3C electromatic relief valve has been attributed to a less than adequate travel distance of the pilot valve stem. This lack of travel distance was a result of an excessive solenoid plunger adjustment screw-to pilot valve stem clearance. The electromatic relief valves are manufactured by the Consolidated Valve Division of Dresser Industries, type 1525-VX.

Vill. CORRECTIVE ACTION:

The relief valve, serial number BK7060, was removed and replaced - 5 a previously rebuilt vahe, serial number BK7070. The failed valve (BK7060) was tested af ter removal, and functioned satisfactorily. The replacement valve (BK7070) was tested, after installation, and failed to open. The problem was then Investigated further, at which time the l tulenoid plunger adjustment screw-to pilot valve stem clearance problem I was discovered. It was then adjusted and the valve was successfully I operated three times.  !

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