05000368/LER-1980-003-03, /03L-0:on 800120,during Mode 3 Operation, Emergency Feedwater Flow Control Valve Failed to Close on Demand.Caused by Lack of Hydraulic Pressure

/03L-0:on 800120,during Mode 3 Operation, Emergency Feedwater Flow Control Valve Failed to Close on Demand.Caused by Lack of Hydraulic Pressure

ML19296B356
Person / Time
Site:	Arkansas Nuclear
Issue date:	02/15/1980
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19296B355	List: 05000368/LER-1980-003-03, /03L-0:on 800120,during Mode 3 Operation, Emergency Feedwater Flow Control Valve Failed to Close on Demand.Caused by Lack of Hydraulic Pressure 05000368/LER-1980-004-03, /03L-0:on 800107,during Mode 1 Operation,Core Protection Calculator B Failed.Channel B DNBR & Linear Power Density Trips Were Bypassed Placing Reactor Trip Logic in two-out-of-three Trip Sequence.Cause Unknown 05000368/LER-1980-005-03, /03L-0:on 800123,during Steady State Mode 1 Operation,Reactor Coolant Leakage Calculation Indicated Approx 3.6 Gpm Unidentified Leakage.Caused by Packing on Pressurized Spray Valves Leaking Excessively 05000368/LER-1980-006-03, /03L-0:on 800123,during Mode 1 Operation,Core Protection Calculator B Failed,Generating DNBR & Linear Power Density Trips in Primary Power Sys.Cause Undetermined. Channel Restarted & Declared Operable ML19296B354
References
LER-80-003-03L, LER-80-3-3L, NUDOCS 8002200446
Download: ML19296B356 (1)

LER-1980-003, /03L-0:on 800120,during Mode 3 Operation, Emergency Feedwater Flow Control Valve Failed to Close on Demand.Caused by Lack of Hydraulic Pressure

Event date:
Report date:
3681980003R03 - NRC Website

text

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hRC FORM 366 U. S. NUCLE AR REGUL ATORY COMMisslON (7 - 77 )

LICENSEE EVENT REPORT EXHIBIT A CONTROL BLOCK: l l l l I i lh (PLE ASE PRINT OR TYPE ALL REQUtRED INFORMATION)

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M EVENT D ATE 74 FS HE,OR T OATE Bo EVENT DESCRIPTION AND PROBABLE CONSEOVENCES h I During Mode 3 copration. with the electric drivpn Fmprgency Foodwater O

2 Ioumn. 2P7R-in enevico ac an auyiliary feedwater pu p for ne ral start _gp o

l Steam Generator feed, EFW flow control valve, 2CV-1025-1, failed to close I O

Ion demand from the Control Room.

The valve failed in the EFW, or safe I

n s

l posi tion.

The block valve was used to control level and all redundant i

o 6 IEFW valves were proven operable. Similar to LER 50-368/79-092,79-090.

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CAUSE DESCR.PTION AP.D CORREC flVE ACTIONS IInvestigation revealed that the valve failed to conrate due to the lack i

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s i lii lof hydraulic 3ressure caused by air in the system.

The accumulator did I

i 7 Idid not indicato low oil The hydraulic system w=q vented R filled with I i

3 loil.

The reouirements of Action Statement T.S.3.7.1.2 were met. One i

ii. tvalve ODerator was returned to vendor for analysis.

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NAME OF PAEPAREP 80 0220 0 % (a