ML19316A444

LER 77-031/03L-01:on 771229,increase in Reactor Coolant Leakage Noted.Caused by Analog Channel 1 WR Transmitter Error Due to Steam from Blown Switch.Transmitter Recalibr. Valving Out Switch Stopped Leak

ML19316A444
Person / Time
Site:	Oconee
Issue date:	02/28/1978
From:	Ken Wilson DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19316A426	List: ML19316A425 ML19316A434 ML19316A439 ML19316A441 ML19316A444 ML19316A452
References
LER-77-031-03L, LER-77-31-3L, NUDOCS 7912110713
Download: ML19316A444 (1)

Text

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ta!:I l On December 27, an increase in reactor coolant leakage was noted. At 2131  ;

la t al l RPS Channol .\ trioned on nress/teno. It was determined that a nressure switch I t o 4 1 L had hinwn.

Reactor shutdown was initiated but was terminated when switch was I 11 51 f vc ivod niit. On Docember 29, it was noted that Channel 1 WR pressure was

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t2,,j ; reading hi;h so the channel was tripped. At 1543 recalibration was complete ,

[ 2, r l l so channol was returned to service.

At no time was the ability of the reactor; i s ie j i to onerate safelv innaired.

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li j o i [ Th6 Es Analoc Channel 1 ',JR oressure transmitter is located about five feet  ;

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i, t 21 i from tho swi t ch s t ruc'< tha transmitter thus throwinc it out of calibration. I i,,3i l Recalibration corrected the tranamitter error. Valving out t'he switch has i,,.1t eliminated the leak. The transmitter was a model 36Pll.

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