05000296/LER-1981-043-03, /03L-0:on 810825,drywell 3-RM-90-256 Continuous Air Monitor Iodine Channel Failed Downscale.Caused by Condensation Plugging Unit Due to Loss of Sample Line Heat Trace from Loose Connection on Thermostat.Trace Repaired

/03L-0:on 810825,drywell 3-RM-90-256 Continuous Air Monitor Iodine Channel Failed Downscale.Caused by Condensation Plugging Unit Due to Loss of Sample Line Heat Trace from Loose Connection on Thermostat.Trace Repaired

ML20010H279
Person / Time
Site:	Browns Ferry
Issue date:	09/18/1981
From:	Holder G TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010H270	List: 05000296/LER-1981-043, Forwards LER 81-043/03L-0 05000296/LER-1981-043-03, /03L-0:on 810825,drywell 3-RM-90-256 Continuous Air Monitor Iodine Channel Failed Downscale.Caused by Condensation Plugging Unit Due to Loss of Sample Line Heat Trace from Loose Connection on Thermostat.Trace Repaired
References
LER-81-043-03L-01, LER-81-43-3L-1, NUDOCS 8109240294
Download: ML20010H279 (2)

LER-1981-043, /03L-0:on 810825,drywell 3-RM-90-256 Continuous Air Monitor Iodine Channel Failed Downscale.Caused by Condensation Plugging Unit Due to Loss of Sample Line Heat Trace from Loose Connection on Thermostat.Trace Repaired

Event date:
Report date:
2961981043R03 - NRC Website

text

NRC FOfp1366 U. S. NUCLEAR REGULA10RY COMMIS$ ION T777) y,'

LICENSEE EVENT REPORT e

coNinot otocx. t i

I _L1 1 10

<etE^SE raiNT Oa rvet au aEOUiaEO i~rOn=ariO~i i

lo l i l l A I L ] B ] R l F l 3 lgl 0l 0l -l 0l Ol 0l 0l 0l -l 0l 0lgl 4l 1l l j lj llgl l

lg 7

8 9 L IC LP.ht.L COOL I4 lb LICt NSE NtJMdF H h

A LICiNSL liPE

.50 SF.Al bd CON'T l0lil l Lj@l 0 l 5 l 0 l 0 l 0 l 2 l 9 l 6 @l 0 18 l 2 l 5 l 8 l 1 l@l 0 ] 9 l 1 l 8 l 8 l 1 l@

c I

H 60 63 JOCK ET NUYBE R 68 69 EVENT DATE 74 l's REPORT DAf t 63 EVENT Of.SC31PilON AND PRotl ABLE CONSEQUENCES h i

[ o l 2 l [During normal steady state operation, the drvwell 3-RM-90-256 continuous air monitor l

lo l3 j l(CAM) iodine channel failed downscale at 1800 on 8/25/81. (T.S. 3.6.C.2)

There was l

Io la i [no danger to the health or safety of the public. There.ere no redundant systems l

[ o l t, l land no previous similar events.

l 1016] I I

1017] I I

I o l x l L_

l 80 i

sa SYSTEM CAUSF

CAUSE

COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUSCODE lol9l l M l C l@ y@ l Zl@ l Il Nl S l T l R l U l@ l E l@ l 7. l @

i 8

9 10 11 12 13 18 19

.'O SE QUE N TI A L OCCUR R F NCF HEFOHy RE VISION

,_iVENIYEAH REPOHT NO CODE TYPE N O.

h,';ttqngs l21 8l 1l l-l l 0l 4l 3l l/l l0[3l lL l b

W fj;tfg i

22 23 24 26 21 2H 2'3 30 31 32 AC llON FUTUHE EFFECT SHUTDOWN ATT ACHMENT NPRD-4 PRIVE COvP.

COVPONENT TAkFN AC T ION ON PL ANT MElHOD HOUHS SUBMITTED FORMbOB.

SUPP LIE R MANUFACTURER lBlQlZl@ QQ l 0l 0l 0l l ]Q l N lg

]g l N l 3 ] 0 l 5lg JJ 14 JS 36 3/

40 43 42 43 44 47 CAUSE DESCHiPTION AND CORRECTIVE ACilONS h I i l o l l The thermostat on the heat trace of the sample line had a loose connection. With-l

~

i i lout heat trace, condensation collected and plugged the unit.

Water was purned, I

li121l sample line heat trace repaired, and the NMC Model AM-331BF CA't was returned to l

liI,ilservice at 0510 on 8/27/81. This is considered a random event and no further l

[ i I.t i lrecurrence control is required.

I 80 I

d

• S T A I: r.,

.POWFH OTHf H ST ATU" ME THOD OF F A rlt 11Y OISCOVE HY DISCOV E HY DESCRIPi TON h lil'.llEl(j l0l9l3l@l NA l

l Al@l Operator observed l

/

il 1/

t 44 44,

.y, go As lis t iv fNT qi m

m,,. n,, m.,,,,,, @ l

, m,,m, nE est (ara m,.v.,n

,o,i, m NA l

NA l

l1 lr, l [3][9 d(hl 1

M IV 18

.,4 4'3 80 P9 HNr W'JF i i m Ps n.U8t ES nu n.l.iioN @

v.m n

.m lii1ll010lOj0,3Lzj@l NA l

"O n. r.,. " u ;,w ot a. hip nO ah~

uwa Ii1Jl0l010181 NA l

u,

u 347..,ie.a.sv

'6 f e e l M it t l y l 7 (" l.

! et..f I'lD' I l t #N

[ i l 9 l Wh!

NA J

a.

n, 3,

$,[i.'tSci,r ne n h M Wi miV I l il W( ')l NA J

ll llllllll [llj i

4 a m

.m e.

so ;,,

Gene lloider (205) 729-6134

?

^y maw osPHEPAHW Pe,rm kK05000296

~

94 010918 PD S

PDR

k

, f

• Te n n": r tm V:dley Aufle. '

1'e u. DF !?

'!, W!st Fe f T \\-

'.. li b. i t l'l ;){

't!

5 1

i i.!

i ;,i.N E?. i A ;. '.

.> 'it 3.6.C.2 296 81043 T.,

.c.,a. p,c.;e.a.

t '. It 9/24/R1 9 m ; 5 d tir,d..

T"i b ;. :

's

. iin st ie.n 6.7.2.b(2)

a g g

,p

_ c_

9.,'-

< f Occ, r: ere 8/25/81 Tinw c.f t 'eccu ri.,i.

1800

.,g.

3

der 'iiie it'on :in -!

". ritit ion e,f Occu rrence-During normal steady state operation, the drywell 3-101-90-2 >6 cont (nuous air monitor (CMf) iodine channel failed downscale at 1800 on 8/25/81.

( :. m.. !it io a : l'r ior h) Ci arrence Unit 1 in refueling outage.

Unit 2. 76%.

Unit 3 at 93%.

^ 1:

.pr<:ified in !h Teclinic;d :ipecificati n Surs c:tlanee a qu rer:icnt > rc. !

Eu

wperaish-c tu y. men t.

DeM ribe Met requirements of T.S. 4.6.C.2.

J, ii t.D u s e

'fi1-urrene.

The thermostat on the heat trace of the sample line had a loose connectton.

Without heat trace, condensation collected and plugged the unit.

,\\ ?

.,, :. i '.

Oci m reni.

i, There was no danger to the health or safety of the public, no release of activity, no damage to the plant or equipment, and no resulting significant chain of events.

i' t r.

!ive Action - Water was purged f rom sample line and unit, sample line heat trace was repaired, and the model M1-331BF continuous air monitor was returned to service at 0510 on 8/21/81. During period of inoperability sampling program was initiated. This is considered a random event and no further recurrence control is required.

F..i!n r<

Dat :

None u!"n!mn:

Per; i4 1.ifilim., lleg..n,d u nt 3 - In u w n f un t rol :;u pt rv.<,o*-

- ia', '/

. m.ics,

,-.,t..

.p/ w