ML19317E046

LER 77-031/03L-0:on 771229,increase in Reactor Coolant Leakage Noted.Caused by Blown Pressure Switch.Transmitter Error Corrected by Recalibr.Switch Temporarily Valved Out, Eliminating Leak

ML19317E046
Person / Time
Site:	Oconee
Issue date:	01/26/1978
From:	Ken Wilson DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19317E043	List: ML19317E041 ML19317E045 ML19317E046
References
LER-77-031-03L, LER-77-31-3L, NUDOCS 7912110824
Download: ML19317E046 (1)

Text

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to1211 On December 27 an increase in reactor coolant leakace was noted. At 2_131 l A 1 RPS channel A tripped on press / temp. It was determined that a pressure g I o 1. i I switch had blown. Reactor shutdown was initiated but was terminated when ( ,

ioIsi! switch was valved out. On December 29 it was noted that Channel 1 WR  ;

io is I oressure was reading high so the channel was tripped. At 1545 recalibration i tairlI was comolete so channel was returned to service. At no time was' the ability ;

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i c i. ; I of the reactor to operate safely impaired.

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cAuSE of scRtPT1oN ANo CoARECf1VE ACiloNS tito 1 The ES Analog Channel 1 WR pressure transmitter is located about five feet ,

ii,i, i from and slightly below the blown pressure switch. It is likely that steam ,

, I from the switch struck the transmitter thus throwing it out of calibration.  ;

i,i3, I Recalibration corrected the transmitter error. Temporarily valving out the ,

i,i.i L switch has eliminated the leak. The trans=1tter was a model 56PH. ,

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naus on emeramen _ K. R. Wilson ,,oy ,, (704) 373-8197 79.12110 M k