05000296/LER-1980-043-03, /03L-0:on 801019,flow Bias Circuitry of Average Power Range Monitor High Flux Drifted High & Declared Inoperative.Caused by Water from Removal of RHR Heat Exchanger Head Draining on Panel 25-7,shorting Out Leads

/03L-0:on 801019,flow Bias Circuitry of Average Power Range Monitor High Flux Drifted High & Declared Inoperative.Caused by Water from Removal of RHR Heat Exchanger Head Draining on Panel 25-7,shorting Out Leads

ML19345A925
Person / Time
Site:	Browns Ferry
Issue date:	11/17/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345A917	List: 05000296/LER-1980-043, Forwards LER 80-043/03L-0 05000296/LER-1980-043-03, /03L-0:on 801019,flow Bias Circuitry of Average Power Range Monitor High Flux Drifted High & Declared Inoperative.Caused by Water from Removal of RHR Heat Exchanger Head Draining on Panel 25-7,shorting Out Leads
References
LER-80-043-03L-03, LER-80-43-3L-3, NUDOCS 8011250419
Download: ML19345A925 (2)

LER-1980-043, /03L-0:on 801019,flow Bias Circuitry of Average Power Range Monitor High Flux Drifted High & Declared Inoperative.Caused by Water from Removal of RHR Heat Exchanger Head Draining on Panel 25-7,shorting Out Leads

Event date:
Report date:
2961980043R03 - NRC Website

text

.

D, -

u e.u~.a*

LICENSEE EVENT REPORT

.h CONTROL BLOCK: !

l l

l l

(PLE ASE PRINT OR TYPE ALL REQUIRED INPORh4ATIONI i

foT l i A t t i a l R I v i a l@l 010 i-I o lo l o l o lo l 10 10 l@ clil1111il@l I

l@

7 3 <>

LICENSEE COOL I4 15 uCENSE MuereEM 26 Ja uCENSE TvPE Jo SF C A r 5.s CON r 7,$ l L @l 0 l 5 l 0 l 010 l 2 l 9 l6 hl1 1011 1918 10 hl 1 l 1 l 1 l 7 l A l 0 l@

8 8.0 61 DOCK ET NUMoEn 64 69 EVENT QATE 71 REroR r Dart no EVEN f DESCRIPTION AND PROSA8LE CONSEQUENCES h foTil I uring normal operation, flow bias circuitry of APRM high flux began to drif t high I

D g i and was declared inoperative at 0100. The limiting condition of operation in note l

g l1-B of T.S. Table 3.1.A was entered. Load was reduced to 400 L'e preparing to l

, shutdown. There was no hazard to the health or safety of the public. There are

[

o.,

ojai g redundant systems. There are no previous occurrences.

lo lil l I

I o f 8 I L_.

J system C A USE C AUS E C o* *

• Valve CCOE CODE suisCoot CCM*oNENr CouE LeCoCE SuleCODE g

lC]Hj@ W @ y @ lIlNISlTlRlUl@ W @ ] @

p 8

9 to 11 12 03 18 19

.9 SEOut N rt AL oCCust RE NCE REPORT

'I E k iS O N

_ EVENT TE AA aE*ORTNo COCE TvPE No

@ g n

,,g I 81 01 L-J l

I 'l 3I Ld i

I3i LtJ L--J LLI

" g;

_Ji 22 23 24 26 2'

21s 29 30 31 JJ ti'T,7 MG' Wl%

5"VWe" mou s @ 's"."Strils',JJM'. 'TA?J'

,JO'CA'n', o LLl@l F l@

Laj@

Lzj@

l o f ol 0161 I Yl@

l N IO W@

lal31619I JJ

'4 M

36 JI 40 el 42 43 4.

er cat >$E CESCRIP110N AND CORRECTIVE ACTIONS

,,,g, ; Water f rom removal of RHR heat exc anger head drained on panel 25-7 into FT-68-5A(5B),,

,,,,,,Model 1151DP, shorting out signal leads. This caused flow bias to drift upscale.

j Water was removed, transmitter dried and flow bias functionally tested and returned g

" o service at 0845, within T.S. limits. ECN L-1880 issued to install protective t

g g

catch basin.

g or En sr.rus @

"'s?3 nsCo,favoEsCa.r.oN @

'# Ms' s,om a 5

li lt l l E lh l0 l9 l6 lhi NA l

lA l@l Operator observation l

'a

".a.,,,,

Co'ArEN, wooNr e,.C1.m, @ l LacAr,o~c,EuAst@

f u Ast @o.. E.3.L2J@l LzJ x^

I x^

l i

• 4 9

10 tt 44 4*p ned Pt WJ ant g (' a ri)LQH E 3

'wPiott ia tves Og f,s, HipitON I - l il l 0 l 0 l 0 l@l Z lhl NA l

,E smNNJ'.N,m',f,a oEsca,.i.oN@

.my,,..

Ld_j l 01010 l@L N^

l I

9 4 I1 12 80 6 t45 06 OH D AV AGE To Acit e rv fief DE *.CniPrioN NA j.

I g 9 to go E C8brYtON EE] L$iSI N^

l I ! I I I I I I I I I I I!

e 9 ta 68 69 80 &

Qg}

"JA\\it OF PREP AHER PHONE:

o

.A Tennessee Valley Aut!.ority Fonn BF-17 Browns Ferry Nuclear Plant BF ' 15. 2 1/10/79 LER SUPPLEMENTAL INFORMATION BFRO 296 / 8043 Technical Specification Involved Table 3.1.A Note IB Reported Under Technical Specification 6.7.2.b(2)

Date of Occurrence 10/19/80 Time of Occurrence 0100 Unit 3

Identification an'd Description of Occurrence:

Flow bias circuitry of APRh high flux began to drift high and was declared inoperable at 0100.

Conditions ' Prior to Occurrence:

U-1 at 96% power U-2 refueling U-3 at 97% power Action specified in the Technical Specification Surveillance Requirements met due to inoperable equipment. Describe.

Returned to service within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> Apparent Cause of Occurrence: The RHR heat exchanger head was removed and the lower head used as a catch basin. The RHRSW valves were leaking enough to over-flow the basin. The water ran 'down on panel 25-7 into transmitter FT-68-5A(5B) shorting the signal leads. This caused flow bias to drift upscale.

1 Analysis of Occurrence:

3 There was no damage to plant equipment. There was no activity release, no personnel exposure or injury and no, dange,r to the health or safety of the public.

Corrective Action

The transmitter was drained and dried. The flow bias was functionally tested and returned to service at 0845.

4

~

j t'

Failure Data:

None

• Retention :

eriod - Lifetime; Responsibility - Administrative Supervier

• Revision:

fW