05000296/LER-1981-007-03, /03L-0:on 810202,setpoint for 3-PS-1-76 Below Tech Specs Limit.Caused by B2TA12SS Setpoint Drift.Switch Recalibr & Verified.Switch to Be Replaced W/Analog Trip Sys by DCR 1398

/03L-0:on 810202,setpoint for 3-PS-1-76 Below Tech Specs Limit.Caused by B2TA12SS Setpoint Drift.Switch Recalibr & Verified.Switch to Be Replaced W/Analog Trip Sys by DCR 1398

ML20003B741
Person / Time
Site:	Browns Ferry
Issue date:	02/20/1981
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20003B739	List: 05000296/LER-1981-007, Forwards LER 81-007/03L-0 05000296/LER-1981-007-03, /03L-0:on 810202,setpoint for 3-PS-1-76 Below Tech Specs Limit.Caused by B2TA12SS Setpoint Drift.Switch Recalibr & Verified.Switch to Be Replaced W/Analog Trip Sys by DCR 1398
References
LER-81-007-03L-02, LER-81-7-3L-2, NUDOCS 8102250424
Download: ML20003B741 (2)

LER-1981-007, /03L-0:on 810202,setpoint for 3-PS-1-76 Below Tech Specs Limit.Caused by B2TA12SS Setpoint Drift.Switch Recalibr & Verified.Switch to Be Replaced W/Analog Trip Sys by DCR 1398

Event date:
Report date:
2961981007R03 - NRC Website

text

~

O u *. NucLtan neuuLA s un v tustmewum NRc FORM.368 17 77) '

LICENSEE EVENT REPORT

.s e@

l (PLEASE PRINT OR TYPE ALL REQUIREO INFORMATIONI CONTROL eLOCK: l l

l l

l 1

i yd l Al L! Bl R f FI 3 l@l O ! 0 l -l 0 l 0 l 0 l 0 l 0 l - l 0 l 0 l@l 4 l 111 ! 1 I 1 i@l l

]@

7 b 3 LICENSEE CCCE to 15 LICENSE %MdEa 4_

6 LaCENSE TvPE JO

$ 7 Ca r be CON'T sUtj] l L@l Ol 5 l 0] O l 0 l 21916 @l 012 l 012 l 811 )@l01212101811 l@

10!11 I

8 60 61 QCCKET NLYSER 6d 69 EVENT DATE

~4 1

'E 8 0 A' A ? E 33 EVENT DESCRIPTION AND PROB A8LE CONSEQUENCES h lo{2l l During normal operation while performing SI 4.2. A-6, the setpoint for 3-PS-1-76 j

oj3j l was found 0. 7 percent below T.S. 3.2. A limit. Redundant trip channel and redundant

• j o,4 i j switch in same channel were operable. There was no effect on the health or l

- l o i s j l safety of the public. Previous events: 296/8045 and 260/7924

[

I Lo is 1 I 1

lc ir j l I

10141I 80 7

8 3 SYSTEV

CAUSE

CALSE CCVP.

vatvE CCCE CCOE SLSCCCE CCVPONENT CCOE SL8COCE SUSCCCE 13l9l

] I] Cl@ l Xl@ l Z l@ l Il Nl Sl Tl Rl Ul@ l S j @ ] @

7 8

9 10 11 12 13 16 19 23 SEGLENTI AL OCCLARENCE AEPCRT R E b l$loN

,,, EVENT YE AR R EPORT NO.

CODE TYPE No.

@,a <g g p018l11 l-l 101017I l-l

! 01 31 W

I-I I 01 g

,f;;7, 21 22 23 24

6 27 23 29 JG 31 J2 TAE N A TC PLANT VET

• HOURS 8

FCR i 8

$L P' LI E VA* L F ACTL AE'-

l E l@[,F_j{

l d@

LZj@

l0l0l0l0l W@

[N l@

l L l@

l B l 0 l 6 l 9 l@

33 34 33 M

37 40 43 42 43 44 47 CAUSE CESCRIPTION AND CORRECTIVE ACTIONS h l i 6 01 1 The model 32TA12SS switch setpoint had drifted. The switch was recalibrated, 1

IsIii i verified and SI 4.2.A.6 successfully completed. This switch will be replaced with j

[iiyi l analog trip system by DCR 1398.

[

l

• li t i I

i t 141 I 50 7

8 )

orwEn status h E's5Sav' 0

's'T'a' WIs*

.cAEa oiscovenv cESca efioN li i5 l I El@ ] O l 9 l 2 l@l NA l

l B l@j Surveillance testing l

88

' A/TiviTv C$ RENT avet NTea 4CTiviTv @ l toCArioN o, aELEasE @

16 } } Zl @o y nELEastW@l

=ELEast NA l

NA l

l2 7

8 9 10 11 44 45 80

1. ER$0*4NEL E VPQtyRE }

NUP.tisf M fvPE OE3CRIPTION -

l

! i 71101 O! Ol@l ZI@l NA

,E,scN,.a' NJc2 d

• CEs..T,cN@

NA l

i_W i 01 01 Ol@l 1 9 ti 12 go LQr$ OF CH QAM AGE TO F AC8Lify tveE CEOCpieTION NA l

l i l 91 l Zl@l r

a

<a

'O 30 gh@og gg.PfiCN l

NA

{

1l ll l ll!!!l1l}

Lij,0.j i

- d 3

10 64 6?

80 5 0

S NAVE OF PREPARER PHCN E-g y O2 2 $n tpq

= _ _ _ _ _.

t O

S v ee '/ alley Authority Fotia B F - l'l

.t r.w.,:. Ferry Nuclear Plant BF 15. 2 4

1/10/73 i Fft SUPPLF.:*F.NTAL INFollMATION i

' y.. : ). Su.

296 / 8107 Technical Specirteatun involved Table 3.2.A

<p. tt 1 Under Technical Specification

6. 7. 2. b (1)

.1 o -

. '>rcurrence 2/2/81

?

Time of Occurrence 0845 If r. ;*

3 3

l

!, i;. '

ti

.fi p,ry:n l_Descrip, tic n'of Oecurrenec:

While performing SL 4.2. A-6, the setpoint for 3-PS-1-76 was found 0.7% below

- technical specification limits.

1,,

nC:ti' ns Pritir tc. Occurrence:

Unit 1 at 97% power.

Unit 2 at'90% power.

4 Unit 3 at-92% power..

l

%ction.qmc:fied in the Technical Specification Surveillance Requirements me:

i pui:t nopergble equipment._ Describe.

No.

Opp..

1 Cause of Occurrenec:

' Instrument. drift-l i

Li. b

,1. "f_ Occu rr"nt:e.

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

X :r A : tie,n :

Recalibrated and. retested. This switch will be replaced by an analog system by DCR 1398.

Fa th:

IL..l.a. :

296 /8045 : and. 260/ 7924.

'F.c t e n tion :. Period 1-_ Lifetime; llesponsibility' - Administrative Superviscr--

b

- *Revi4,n :

L r

[.