05000321/LER-1979-094-03, /03L-0:on 791121,while Reactor in Run Mode, Discovered B Pump Running W/O Discharge Pressure or Flow on Local Gauges.Caused by Breaking of Pump Line Bottom Shaft. Shaft & Suction Bell Replaced

/03L-0:on 791121,while Reactor in Run Mode, Discovered B Pump Running W/O Discharge Pressure or Flow on Local Gauges.Caused by Breaking of Pump Line Bottom Shaft. Shaft & Suction Bell Replaced

ML19290B914
Person / Time
Site:	Hatch
Issue date:	12/07/1979
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19290B911	List: 05000321/LER-1979-094, Forwards LER 79-094/03L-0 05000321/LER-1979-094-03, /03L-0:on 791121,while Reactor in Run Mode, Discovered B Pump Running W/O Discharge Pressure or Flow on Local Gauges.Caused by Breaking of Pump Line Bottom Shaft. Shaft & Suction Bell Replaced
References
LER-79-094-03L-01, LER-79-94-3L-1, NUDOCS 7912140436
Download: ML19290B914 (3)

LER-1979-094, /03L-0:on 791121,while Reactor in Run Mode, Discovered B Pump Running W/O Discharge Pressure or Flow on Local Gauges.Caused by Breaking of Pump Line Bottom Shaft. Shaft & Suction Bell Replaced

Event date:
Report date:
3211979094R03 - NRC Website

text

=

9

• 6e lit LICENSEE EVENT REPORT

.h CONTROL BLOciC l l l_ l l l l

(PLE ASE PntNT OR TYPE ALL 8tEQUIRED INFORW.TIO*;)

lE lt lI! Il l@'l e ' O l 010 l 0 l 0 l O l 0 l 0 l 010 l@ 4 l 1 l 1 l 1 l 1 l@l l

~

ssw..h

,uC6v..a v,t is uCau ' v*si 2>

a uu wt t v et u e

Cr'* 'T f' O

((#$ Il@l 01 5 ! nj 01 O l ll ? l I C.l I l t ! ? ' l l 7 ! 4 '@l 1121.o l 7 l 7 l 9 lh e.

........ ~

4

.u n.

tvtNT Orspian.

".7 mW.: r c0.stacE*.cf s h l Uith the re. actor in the run mode and IP41-CO313. c l.u t Sersice Water Pump, in service l o,

w a lov nr. um alirm in divislo:: II of the Pl...

.rs

.e '.wr syste i was received

[

lol4l l in the control roem.

It'41-C001D was idic in t i.... L.>or..md was ic:wdiately placed l

[TTTI I in service and the pressure returned to normal. L"pon inveEtigation it was noted that l pR8 !m "B" pu~ va t running but did not have any discharge prcisure or flow on local i

5 o 7 i gauges. The "B" pump was declared inoperable and a limitirr.,' condition for operation [

v. I was established por Tech Specs section 4.5.J.2.b.

Public health and safety were (cong) o C

7e?.19 VALVE

$v$tt.1

CAUSE

5..AuSE CoCE couroNENT CODE SL3Coof susc00E CC;E CoOE Q

lW A lh Wh l Blh lP lUlMlP X lX lh W@ y @

io n

i2 o

i.

m St out NTI AL occurrence REroRT REvlsioN REPORT No.

CoCE TYPE No.

l VENT Y E AR l- -J 1019141 W

IOlil W

l--J W

gg a e-E

@,ajpg 7f91 28 22 23 24 26 27 3

3 30 35 32 ACTION FUT'. s E rsrECT SauTDem ATT Acwvt NT NPRDr PRivE covo.

coveosENT SuSMsTTED Fo8.

3.

56Pru E R MANuFACTUAER l

144 t.; I C '.

~2*

NT ME T riC3 MouR$

Wh gia: W g lJl1l0l5[@

l A_j@l,Z,j@ Q,_j@

[,Z,,j@

l010l0 l

33 34 Jh Jo 3J 40 44 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h Q l During disasse :bly of the pumo, it was discovered that the Iine bottom shaf t had l

,, TTi 1 twisted into.

It was also noted that the suction bell bearing showed evidence of I

[

q ] galling. However it is not believed that this caused the s'raf t failure. A section l

l of the broken shaf t is being sent to a Metallunical Lab to try to determine the

[

i 3 f;TT1 l cause of the failure. The shaf t and suction bell hearing vt e replaced and the (cont) ;

4,

.3

's^r*AS'1' ofwfRsTATus h E'sEoNEv'

. ar ocovf Rv of senieTioN Q W h l110l0l@l NA l W@l' Cureator Obsarvation l

A Tivif y CC TE\\T STELE ASED of

• elf A5f AWouNT oF ACTIVITY LCnfloN oF RELE ASE n

l l

NA l

. L.z J O L2 J 3 l i s u

,i

.4 4

.a Pt sesO*.*.E ' E * *0$ J I S Nuvat n t v.* t

Es:Hiefiom.

11HI 101010A_JGI NA l

8 1 i

17 IJ EG

. a Es SESCnier oN NA-l l'gl j0 l0 U

7 8

'J 1,

12 bJ E o?. 0F osa Mva..I :Dro ury.

TYPE t'd aJNPTIG*4 NA l

T 1Iz.191.

l,,

,.o,'n @ cu c.., d "C " ONLY

[_j l NA l lllllllllllll}

o s

a s su se v>

sa s I

ll6 e

ic 791214 0 +3(

t Georgi.: Pu.u r Cut. p.uty Pla:r r.

1. Il it ch L:,il L,

, ti K port..: ale Uecurrtace 1:cport l'.).

'a d - J.' ! / 19 i'>- 9 7..

I'v. ut Desc ript ion anel Prob.ible Cen,ct;us ices (cont) not ef fe.-t o J hy t hin jncident. A previous failure of this nature on another plant service water pune occurred on ribruary 19, 1976. This failure was repc,rted un LE:t No. 50-321/19 6-13.

Cause Description and Corrective Action (cont) pump was reassembled to vendors specifications. The purp was placed back in service on ':avember 26, 1979 and it:bl-3132, Plant Service Uater Operability Test, was performad satisfactorily.

100R OREE 1579 117

e i

WARR5TIVC PJ " ORT C.. + r. 1 A..

riy Pla-t F.

1. 1: it - h B.nley, Georr,i cs 31513 1:e;v i t..

't o.v u r s. r.. c 1.. po r t No. 3J-321/ i'J />-%

On k'ede t :.' v., hvt M e r 21, 1979, with the reactor in the run mmle at 100I FMt.snd IP41-COdlB Plant S e rvice '.'a t e r P unp, in servic e, a lew p ressure alarm in divisica II of the Plant Service 'iater system was received in the ceatrol roon.

IP41-C001D was idle in this loop and was in; mediately placed in service. This resulted in the pressure returting to normal.

Upon investi;;ation it was noted that the "B" pump was riu nine,, but had no discharge pressure or flow. The "B" pur.;p was declared inoperable and a limitir.; condition for operation was estab.ished per Tech Spec section 4.5.J.2.5.

This coadition did not trinder the continued operation of the plant.

During disansembly of the pump, it was discovered that the line hnttom shaft had twisted into. It was also noted that the suction bell bearing showed signs of galling. Itoweve r, it is not believed that this condtion caused the shaft failure.

The shaf t and suction bell bearing were replaced and the pump was reassc= bled to venders specifications. The pu=p was placed back in service on November 26, 1979 and IISP-1-3182, Plant Service Water Operability Test, was performed satisfactorily.

A section of the broken shaf t is being sent to a metallurgical lab to try to deter =ine the cause of the shaf t f ailure. A follow up report will be submitted when the cause for the shaf t failure has been determined.

Af ter revicwing the history of maintenance on Plant Service Water Pumps, the only sir ilar event found was reported on February 19, 1976 on 1.ER No. 50-321/19 76-15.

This shaft failure was due to a cetallic finw in the shaft.

P00R ORBlML 1579 118