05000321/LER-1979-012-03, /03L-0 on 790124:during Shutdown,High Pressure of 200 to 300 Psig Existed in RHR Heat Exchangers.Caused by Slow Leak Past E11-F015A Valve

/03L-0 on 790124:during Shutdown,High Pressure of 200 to 300 Psig Existed in RHR Heat Exchangers.Caused by Slow Leak Past E11-F015A Valve

ML19261B310
Person / Time
Site:	Hatch
Issue date:	02/07/1979
From:	Baxley S GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19261B309	List: 05000321/LER-1979-012, Forwards LER 79-012/03L-0 05000321/LER-1979-012-03, /03L-0 on 790124:during Shutdown,High Pressure of 200 to 300 Psig Existed in RHR Heat Exchangers.Caused by Slow Leak Past E11-F015A Valve
References
LER-79-012-03L, LER-79-12-3L, NUDOCS 7902150299
Download: ML19261B310 (2)

LER-1979-012, /03L-0 on 790124:during Shutdown,High Pressure of 200 to 300 Psig Existed in RHR Heat Exchangers.Caused by Slow Leak Past E11-F015A Valve

Event date:
Report date:
3211979012R03 - NRC Website

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i On 1/23/79 during operation and on 1/24/79 durino a shutdorin. high oressures of 200 I

io a i to 300 psig were observed to exist in the Hatch Unit 1 RHR heat exchangers were ventedl to the torus via the heat exchanger vent valves. This was successful for B. but it I

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40 di 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS li l 0 l l0n the 24th, the water being vented from exchancer A flashed to steam in the torus. As 1 [i li l l a result of this the torus pressure rose and caused the tan 13_10 drvwoll vacuum I

,, i,i l breakers to function which culminated in a reactor scram due to the rise in devwell

[ pressure. Investigation indicated that the pressure rise in the heat exch' anger was I

lij3i gi14j ldue to a slow leak past the E11-F015A valve. Thus, the valve internals were (con't) 1 80 7

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Georgia Power Company Edwin I. Hatch Plant Baxley, Georgia 31513

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i Cause Description and Corrective Actions l

l removed, repaired (valve seat was lapped) and replaced.

Additional corrective action were taken as stated in the attached letters submitted January 30, 1979 and January 31, 1979.

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