ML19347C827

AO 73-20:on 730909,isolation Condenser NE01A Condensate Return Valve V-14-34 Failed to Operate During Last Stages of Plant Cooldown.Caused by Tripped Overloads on Starting Contactor.Overloads Reset

ML19347C827
Person / Time
Site:	Oyster Creek
Issue date:	09/10/1973
From:	Reeves D JERSEY CENTRAL POWER & LIGHT CO.
To:
References
AO-73-20, NUDOCS 8103040992
Download: ML19347C827 (2)

Text

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Timet 1 43 p.m.

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. ABNORMAL OCCURRENCE REPORT NO. 73-20

SUBJECT:

Failure of Isolation Condenser NE01A Condansate Return Valve V-14-34 to operate during the last stages of a plant cooldown.

This event is considered to be an abnormal occurrence as defined-in the Technical Specifications, paragraph 1.1SD. Notification of this event as required by the Technical Specifications, para-graph 6.6.2.a, was made to AEC Region I, Directorate of Regulatory Operations, by telephone on Sunday, September 9,1973, at 12:45 p.m. ,

and personally to Mr. E. Greenman:on.Honday, September 10, 1973.

SITUATION: During the last stages of a plant cooldown, an attempt was made to initiate the "A" Isolation Condenser. The condensate return valve V-14-34, however, failed to operate. Pertinent data is as follows: ,

c Valve Manufa'turer: Crane .

Size: 10" h' edge Gate Operator Manufacturer: Philadelphia Gear Company /

Peerless Electric Operator Type: SNV Size 2 _

Motor Rating: 4.3 h.p. @ 1900 rpm,125 volts DC, 35 amps Prior to this failure, the valve had been operated successfully with no failures on previous operability surveillance tests and also had been used several times during the initial stages of the plant cooldown.

CAUSE: Both overloads for the starting contactor were found tripped, i

0 ,:

'Abnorral Occurrence  % g Report *No. 73-20 ~2- September 8, 1973 REMEDIRL ACTION:

The overloads were reset and the valve was operated electrically with no prior manual operation. It was fully stroked open and closed twice, operating satisfactorily. A trace of currents drawn by the motor was taken and compared with a trace taken the previous Thursday (September 6,1973) . No differences were detected.

SAFETY SIGNIFICANCE:

The significance of this event is the loss of redundancy of the Isolation Condenser System, one of which is, reqdited to act as a means for heat removal as detailed in Amendment 67 to the FMAR.

t Prepared by: ( 4+. . . Date: 9/10/73 V

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