05000348/LER-1979-003-03, /03L-0 on 790116:following Reactor Trip,Turbine Driven Auxiliary Feedwater Pump Failed to Start.Caused by Trip/Throttle Valve Which Tripped Shut

/03L-0 on 790116:following Reactor Trip,Turbine Driven Auxiliary Feedwater Pump Failed to Start.Caused by Trip/Throttle Valve Which Tripped Shut

ML19274D661
Person / Time
Site:	Farley
Issue date:	02/13/1979
From:	Hairston W ALABAMA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19274D655	List: 05000348/LER-1979-002-03, /03L-0 on 790116:120V Vital AC Bus 1B Was Deenergized When Inverter 1B Tripped Due to Components Failure.Capacitor,Air Core Choke,Resistor & Fuse Were Replaced & Inverter Returned to Svc 05000348/LER-1979-003-03, /03L-0 on 790116:following Reactor Trip,Turbine Driven Auxiliary Feedwater Pump Failed to Start.Caused by Trip/Throttle Valve Which Tripped Shut ML19274D654 ML19274D657
References
LER-79-003-03L, LER-79-3-3L, NUDOCS 7902210233
Download: ML19274D661 (1)

LER-1979-003, /03L-0 on 790116:following Reactor Trip,Turbine Driven Auxiliary Feedwater Pump Failed to Start.Caused by Trip/Throttle Valve Which Tripped Shut

Event date:
Report date:
3481979003R03 - NRC Website

text

tJRC FORM 3GG U. S. NUCLE AR HEGULATOR Y COMMISSION LICENSEE EVENT REPORT CON TROL BLOCK: l l

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lh (PLE ASE PRINT OR TYPE ALL REQUIRED iNFORMATION) t 6

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8 60 61 DOC <ET NUY9ER 68 61 EVENT DATE 74 75 HEPORT D AT E 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l Following a reactor trip at 0130 on 1/16/79 the turbine driven aux. feedwater pump l

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[ o ; 3 y l (TDAFP) f ailed to start when the trip / throttle valve tripped shut.

T.S. 3.7.1.2 l

l o 14 l l requires at least 3 independent steam generator aux. feedwater pumps and associated l

[o jsg flow paths shall be operable. The trip /thrittle valve was manually opened and the TDAFP was verified operable. The T.S. 1. s. l.2 action statement was met.

The health j o o l o l 7 l l and safety of the put.lic were not af f ec.ted.

A similar occurrence was reported in l,

l LER-021/01T-0.

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a 60 7

8 9 SYSTEM

CAUSE

CAUSE C O*M.

VALVE CODE CODE SU8 CODE COMPONENT CODE SUSCODE SUBCODE lo191 i s I n l@ LIj@ Lx_1@ l v l ^ l 1. I v I o I e l@ LJ_J @ 13 @

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9 10 11 12 IJ 18 19 20 SEQUENTI AL OCCURRENCE REPORT REVISION LE R/RO EVENTYEAR REPORT NO.

CODE TYPE NO.

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40 41 42 43 44 47 33 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h ltlollSubseauent investication deter.nined that the trip / throttle valve had tripped due to al Il I i l 1TDATP Overspeed Trip.

The overspeed condition was caused by the TDAFP nini fL w valvel Ispring tension being insufficient to hold the valve full open (valve was 25% open).

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2 lil3l l The spr'ing tension was adjusted to fully open the AOV and the turbine did not overspedd lil41 lon subsequent overspeed tests.

7 8 9 83 ST S

% POWER OTHER STATUS btSCO R

DISCOVERY DESCRIPTION Lcj@ l01010 l@l NA l

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8 9 10 12 ti 44 45 46 80 ACilvlTY CONTENT RELE ASED OF RE LE ASE AMOUNT OF ACTivlTY LOCATION OF RELE ASE NA l

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li Ic l Lzj @ Lz_l@l 7

8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUV8ER TYPE

DESCRIPTION

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,E RS.NE L imu'iES oESCRiPTiO~@

NUv8Ee FG 110101 Ol@l NA I

7 8 9 11 12 80 LOSS OF OR DAVAGE TO FACILITY Q

( TT1 LzJ@l TYPE DE.SCRIPTION v

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7 8 9 10 80 iSSui"hl*L'SCRiPTiO~ @

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8 0 10 63 69 80 5 NAME OF PREPARER U. C. Hairston, III (205) 899-5156 pygyg.