05000368/LER-1979-104-03, Steam Driven Emergency Feedwater pump,2P7A,turbine driver,2K3,tripped on Overspeed Upon Receipt of Low Steam Generator Level Signal.Caused by Design Deficiency.Governor Valve Control Modified

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Steam Driven Emergency Feedwater pump,2P7A,turbine driver,2K3,tripped on Overspeed Upon Receipt of Low Steam Generator Level Signal.Caused by Design Deficiency.Governor Valve Control Modified
ML19350E483
Person / Time
Site: Arkansas Nuclear 
Issue date: 06/19/1981
From: Shively C
ARKANSAS POWER & LIGHT CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19350E481 List:
References
LER-79-104-03X, LER-79-104-3X, NUDOCS 8106230155
Download: ML19350E483 (1)
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LER-1979-104, Steam Driven Emergency Feedwater pump,2P7A,turbine driver,2K3,tripped on Overspeed Upon Receipt of Low Steam Generator Level Signal.Caused by Design Deficiency.Governor Valve Control Modified
Event date:
Report date:
3681979104R03 - NRC Website
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REVISED REPORT - PREVIOUS REPORT DATE 1/29/80 NaC eonas ssa u. s Nucts AR REGULAYORY COMMl15604 t.lCENSEE EVENT REPORT EXHIBIT A CONTROL BLOCK: I ] l l l l jh (PLE ASE PRINT OR TYPt ALL Rt0UIREO INtoRMAf t0NI

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EVENT Ot SCRIPTION AND PRQ9 ABLE CON 5(OUENCES i mmediately following a plant t p, the Emergency Feedwater (EFW) Pumo.

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o a E t 2P7A. turbine driver. 2K3. trioped on ovnetnand innnn rareine nf rras @e 1 finTl I to low steam genuator level.

The Electric Driven Er'W oumo. 2P7R. an.d. 05-1 gociated valves were operabb & supplied sufficient flow for the transienta o s lo la l t response.

The overspeed trip was reset & the pump was successfully startqd lo_Lu 13 times. then declared ++ arable. Occurrence is similar to I ER's 850-368/784 10?2,79-055, 79-072,'79-081. Reportable per T.S.6.9.1.9.b.

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C AUSE Of 5CR6PTION AND COARECflVE ACTIONS I Cause of the EFW turbine overspeed trips was detenning to be design re,

i o ilated. Modifications to the governor valve control optimized governor i

i Eri] Ivalve response to speed signals. A testing program verified EFW turbine i gi re.l iabili ty.

Refer to LER 50-368/80-050/03X-4 for further informatinn.

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