05000298/LER-1979-040-03, /03L-0:on 791203,while Performing Maint on Backwash Line for Svc Water Pump Strainer,Execessive Erosion Noted in Pressure Boundary Piping.Caused by High Water Velocity & Solids Content of Backwash Line

/03L-0:on 791203,while Performing Maint on Backwash Line for Svc Water Pump Strainer,Execessive Erosion Noted in Pressure Boundary Piping.Caused by High Water Velocity & Solids Content of Backwash Line

ML19257C640
Person / Time
Site:	Cooper
Issue date:	01/02/1980
From:	Doan P NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19257C635	List: 05000298/LER-1979-040-03, /03L-0:on 791203,while Performing Maint on Backwash Line for Svc Water Pump Strainer,Execessive Erosion Noted in Pressure Boundary Piping.Caused by High Water Velocity & Solids Content of Backwash Line
References
LER-79-040-03L, LER-79-40-3L, NUDOCS 8001290529
Download: ML19257C640 (1)

LER-1979-040, /03L-0:on 791203,while Performing Maint on Backwash Line for Svc Water Pump Strainer,Execessive Erosion Noted in Pressure Boundary Piping.Caused by High Water Velocity & Solids Content of Backwash Line

Event date:
Report date:
2981979040R03 - NRC Website

text

.

NRC FORM h U. S. NUCLE AR REGULATORY COMMISSION f7 77)

LICENSEE EVENT REPORT CONTWL BLOCA. l l

l l

l l

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATioN) i e

I o I i l l N l E l C l P l Rl 1l@l 0 Ol-l 0 l 0 l 0 l 0l -l 0l 0 Ol@l 4 l 1 l 1 l 1l 1]@l

' A T 2d @

l l

1 d

3 LICENSEE CODE 14 15 LICENSE NuveER J$

26 LICENdt TvPE JO di CON'T

,"% !Ll@l0l5 0j0l0l2 9 [ 8 l@l1 l2 l0 [ 3 l 7 l 9 @l 0 l 1l 01 2l 8l 0l@

o 1

60 b'

DOcx E T NLYBE R bd 63 EVENT OATE 74 15 REPCRT CATE NO EVENT DESCRIPTION AND PROB ABLE CONSEOVENCES h [During normal operation, while performing maintenance on the backwash line for the I o

fo i 3

@ rvice Water pumps strainer, excessive erosion was noted in niping which formed I

kart of the Servise Water cressure boundarv. The occurrence cav have le3 to opern-1 o

a [o

ition in a degraded m.:de as permitted by (T.S. 3.12.C.2).

Had the line failed,the a 16 gtrainer could have been bypassed and the redundant Service Water loop was availablel.

j, lThis occurrence presented no adverse consequences from the standpoint of public l

health and safety.

I i

s >

Sv5TEY CALSE

CauSE

COVP VAL %E rCLE COCE CL9 CODE CO"PCNENT CODE SL8 CODE SLBCCCE W l A l@ W@ l X l@ l P l Il P l El Xl X @ y@ [Z_J @

m 1,

' E JL E N TI AL tx ( L N 4t Ntt HErDHT "E V ' DON

• .T<faA 4E'QH T NO CODE TYPE NO b N;f', A E l 7l 9l l0l4l0l l/l 10l 3!

lL l

[-j l 0l

_.1 il JJ J4 J6 2'

23

?>

30 31 JJ

i%

FuT-cFFECT AT OCn.

ATT AC MY E N T NPRD4 PRIVE Coup COVPONENT 4-

'Am

. Ac i W.

ON PL ANT YEinco

- OuRs..

sysveTTED FORM 3y9

$(PP L s E R YANUFACTURER L1]SLEJ@

l_;;J@

zl@

l010 01 01 L2]@

l lAl@

l Al 51 11 Ol@

J4 A

6 Ji 40 4l 42 44 47

J LSE DESC AiPTICN AND CORaECTIV E ACTIONS lThe cause of the failure is high water velocity and solids coni;ent of the backwash [

lline which accelerated pipe erosion. The p,ioe is 3 inch schedule 40 which operates I i

g g lat 50 psig and river temperature. Pipe was replaced. Thewal; thickness of the I

ibackwash line will be periodically eval.cated to determine whether a change in de-1 i

i 4

Isien is warranted.

I 4

1 80 F ACILt Ty UETHOD OF STAfus POWER OTHE R STATM 015COVERY O!SCOV iRY DESCRIPTION 3' '

d @ l 0l 9l 8l@l NA l

l Al@l Maintenance Observation l

ACTivlT V TENT AE LE ASEC N dELEASE AVOUNT OF ACTtVITY LOCATI IN CF RELE ASE La @ t_zj@i m

I i

i e

4

)

10 it 44 46 60 PfO' 1NNE L f M P!)$L A E5

'9FR TYPE

DESCRIPTION

10 0101@lzl@l N

I 7

PmO,NJ'..ou'iEs D

ao 4

h l

l0 101@l r

& m ihPd - @

ff $"* Q

' ! ', [ 2.j@l u

io

" 'Oc.oP,,o~ @

8 0 0129 0 5 ;t 9 ldi.Lj hs[@l NRc u a im 'r o

i i

ll l1l iII Il}

m d

3 40 os sa

80. ;

Paul F. Doan 402-825-3811 o

NAYE OF PREPARER PHONE