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

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: 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 05000368/LER-1980-022-03, 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 05000368/LER-1980-030-03, Steam Driven Emergency Feedwater pump,2P7A,turbine driver,2K3,tripped on Overspeed Following Manual Start.Caused by Design Deficiency.Governor Valve Control Modified 05000368/LER-1980-036-03, Steam Driven Emergency Feedwater pump,2P7A,turbine driver,2K3,tripped on Overspeed Following Manual Start.Caused by Design Deficiency.Governor Valve Control Modified 05000368/LER-1980-050-03, Steam Driven Emergency Feedwater pump,2P7A,turbine driver,2K3,tripped on Overspeed Following Manual Start.Caused by Design Deficiency.Governor Valve Control Modified 2CAN068113, Forwards Updated LERs 79-104/03X-1,80-022/03X-2, 80-030/03X-1,80-036/03X-1 & 80-050/03X-4
References
LER-79-104-03X, LER-79-104-3X, NUDOCS 8106230155
Download: ML19350E483 (1)

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

text

h a_,

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

%. I AIR l Al Nj 0 l 2 IM. I'

- 10 l0 l 0l Oj 0 l-l 0 ]O jgpl l1 l 1l1 l 1lgl

., c., g l g sc... coo.

.. s va ~, -..

2.

..a m.,,,,,.

p"f

""C L.L_J@l0 l 5 p 1010131618_l@l1 1213 1017_La.@l 01611 I 9 la 11 l@

CON ooc..r.,v...

e ivi~i o.r.

a.,0.ro.re a

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

I I

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.

l o.

W.i's.

Juid,.

' CSS"

• ^t!

iscis.

cc co o~i=1coui E, B.

IH l HJ.@ [,,B_J@ L,,A_j@ IT l illo i n lI I N IS L.Z_J@ LZ._J @

i m

n?"!",','.

"F" 'l '"

"n?"'

";l "

@,a, g,...

w.~1....

L_J 11 101 41 W

10 131 DL)

L,, J LLJ o

17191 t

_as n

a>

s.

>s a,

z.

2, u

n

?

N O

,L T

a. T MOU.S 22 Sv. 8 7

,o Y w@on LAj@ IT l11417 l@

,,L g.

uAN,a T t.

L._l@

LZ.J@

l 01010I0 i LN_J@

Z lf_J@l2_J@

L_J 23 34 35 34 3

ay el 42 43 de e,

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.

I i

I of r status @ "'scNN [A_j@lControl Room Indication @

'si.'M' s,oas.

c scove. oesc..rio 8 LBj@ 10 l 010 l@lPlant trip i

l

'2 is a

a a,j,,,,,,

co'?,,,,

- ou~1o,.cri.,, @ I toa,,o.,,....,@

,u u.o o,..tr u I

NA l

8 LZ_] @ LZ_J@a'.. NA l

,,v..o.

',*t e. os

.c.. 1,o @

=

l 1,..

10101 Ol@[Z j@l NA j

i >

,...o sit..ou',fies

's

=

l o sc.,,r.o @

oo..

101010j@l NA l

l t a h05 @' "idk'?,h'""@

(J_J l

NA l

i o

,b,od, @d','c.,1,o.,@

'"'"E Nac ust oNtv l

NA 1 llllllllll;;l

> o Chris N. Shively 501/968-2519 NAug<s pre,ARrR 8106230\\n