ML20024D618

LER 83-039/03L-0:on 830701,during Seismic Switch Test & Calibr Procedure SI 4.2.J.2.B,switches B & C Would Not Operate Properly.Caused by Faulty Transistor & Dirty Potentiometer.Parts replaced.W/830728 Ltr

ML20024D618
Person / Time
Site:	Browns Ferry
Issue date:	07/28/1983
From:	Chambers G, Green H TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
LER-83-039-03L-01, LER-83-39-3L-1, NUDOCS 8308050365
Download: ML20024D618 (3)

Text

.

u9 NUCLE AM REGULA,ORY COMM,bSiON A.PROVF D tlV OMG NEC FO AM 356 215043

, \'/CYd,so LICENSEE EVENT REPORT (PLE ASE PRIN T cR TVFE ALL REoUIREO INFORMATIOW CONTROL BLOCK: l l l l l I l@

I Ome.....

l 0 l O!.... 01 0l - l 0 l 0 l@l 4 im..~. 1 [_1l.... 1 l ..1 I@[_ l !@

l oI1.l .l A lm L....

, } Bl.Rl .... Fl 1l@l 0} d

.. .. .. ,. .,m.,..

con T ~

l 0 l1 l "J' "' l Ll@l O! Sl 0l 010 l 215! 9'@l 0 l 7ev. l 0,o...

l 1 l 813l@l 017t 1 21 8l Bi 3j @ '

..,o.,o.v. ..

, . .. ., coc..,~uu... .. .. 1.

EVENT oESCRIPTioN AND PROSABLE CoNSEoUENCES ()10 l 0 l2 l l During performance of SI 4.2.J.2.B (Biaxial Seismic Switches Channel- l l0 l3 l l Functional Test and Calibration) switches B and C would not operate l lo l4 ll within the limits specified in T. S. 3 2.J.1. The problem was discovered l lol5ll on 7/1/83 and the switches were returned to service on 7/6/83 Seismic j l016ll values above the T. S. setpoint initiate control room alarm. There was l l0l7ll no danger to the health or safety of the public. Switch A was operable l lolall and within acceptable limits during the event. l

' N'o'." *co^"o*: ..

• U3, co-,on.u coo.

.u = lc e . "00.

10191 lI l E l @' lE l @ lE l @ lI lN l S l T hi !U l@ IS l@ l2 l@

. i. .. .. .. .. .. ..

" ,"','".' *"""":"*' " = " " '1' '"

@kbf,."..f......... l0l 3l 9l l/l !O h! l-l [QJ Ll,8 l9la

, b.. ,, .. .. [L.

. _l ,, ..

.9

=: =":: ::::::, = = " ... . . @

l A l@!Z l@ lZl@ lZ !@ l0 l0 J 0 0 u-l lY l@ lN

.. .. i. .. ,, .. u l@ hu l@ lK I1 13 0 l .. .,

CAUSE DESCRIPTloN AND CoRHECTIVE ACTIONS ,.

h IiI0 Il Switches B and C are Kinemetrics model HS-3's.

Switch B was_found to have I lil'll a faulty out_put transistor on its amplifier board and switch C had a dirty I lil2ll potentiometer. The transistor and potentiometer were replaced and the l l1l3ll switches were returned to service. This is considered to be a random event I l

l1l4ll and no further recurren,ce_ control is__ required.

I O,H...,.,u. D..COV..T L .C O V E . , fi . . C. ,P, s O N l l t l s. ].l H l @ l0 l 0 ld,.@l N/A l !B l@l Surveillance Testing  !

i , .. .. m ..

j  ::an':. *::.":.. ...,,.,a,,,,,,

@ e.,.,,,,.. .~...@

N/A l [., N/A l l I i I e I L.Z_J @ l 2 l@l l , " ".'::" ' ' ";, :" " " . . . . . , ., .. . @

N/A l l i! 7..l l 01010'@]@l

{

~'", ::"" '" ".' ::,.,.. @

l il a j l 0 l 0l Ol@l N/A _j 1 , .. ,, ,,

.... ........... '"' '@ N/A I1l9IIZl@l r .. ,.

l

""""*'" rs RC USE oNLv

@ 8308050365 830728 I2loj W @l _ [DRADOCK 05000259 ..

l llllllllllll .el a.

r . . la N AME of

• APER G. T. Chambers pgg u (205)729-0841 g M

~

Tennessee Valley Authority Form BF 17

, . Browns Ferry Nuclear Plant DF 15.2

-

• 2/1?/82 LER SUPPLEMENTAL INFORMATION BFRO 259 j 83039 Technical Specification Involved 3.2.J - --

Reported Under Technical Specification 6.7 2.b.(2) Date Due NRC 07/31/83 Event Narrative: ,

Unit 1 was at 0% power in a refueling outage. Units 2 and 3 were both operating at 98% power. All 3 units were affected by this event. During performance of SI 4.2.J.2.B (Biaxial Seismic Switches Channel-Functional Test and Calibration) it was discovered that switches B and C would not operate within acceptable limits. Switch B operated at approximately .6g and switch C would not operate within the limits of the test instrumentation. T. S. 3 2.J specifies a measurement range of 0.025 to 0.25g and a setpoint of 0.1g for the biaxial switches. Seismic values above the T. S. setpoint initiate a control room alarm.

A 30 day LCO was entered. The switches were discovered on 7/1/83 and returned to service on 7/6/83, following completion of SI 4.2.J.2.B. There was no danger to the health or safety of the public because switch A was fully operable and within the limits of Tech. Spec. 3 2.J. ,

Kinemetrics switches B and C (model HS-3) were found to have a faulty output transistor and a dirty potentiometer, respectively. The transistor and potentiometer were replaced and the switches returned to service. This was a random event and no further recurrence control is required.

• Previous Similar Events:

None Retention : Period - Lifetime; Responsibility - Document Control Supervisor

• Revision: ((

p.-

. % gM ekATENNESSEE VALLEY AUTHORITY 4 9 jag.

. , ' " CH ATTANOOGA. TENNESSEE 37401 , e c. 8 .4 A

N , q'T 1750 Chestnut Street Tower II I4 gs . 7.6 03 AUC g

$3 2, 1983

• O2 Mr. James P. O'Reilly, Director U.S. Nuclear Regulatory Commission Suite 2900 101 Marietta Street, NW Atlanta, Georgia 30303

Dear Mr. O'Reilly:

TENNESSEE VALLEY AUTHORITY - BROWNS FERRY NUCLEAR PLANT UNIT 1 - DOCKET NO. 50-259 - FACILITY OPERATING LICENSE DPR REPORTABLE OCCURRENCE REPORT BFRO-50-259/83039 The enclosed report provides details concerning two biaxial seismic switches that would not operate within technical specification limits.

This report is submitted in accordance with Browns Ferry unit 1 Technical Specification 6.7.2.b.(2).

Very truly yours, TENNESSEE VALLEY AUTHORITY H. J. Green Director of Nuclear Power

Enclosure cc (Enclosure)

Docu. ment Control Desk i U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Records Center Institute of Nuclear Power Operations Suite 1500 1100 Circle 75 Parkway Atlanta, Georgia 30339 NRC Inspector, Browns Ferry i

OYFIC1AL co@ .

h 1

An Equal Opportunity Employer llI

__ _ _ . . _ _ _ _ _ _ _ _ _ _ _ . _ _ _ , _ _ _ , _ , . . - . _ _ ~ _ . _ __ _