05000325/LER-1979-044-03, /03L-0 on 790706:while Performing Reactor Low Water Level 1 Channel Calibr,Switch 1 Found Out of Tolerance Low.Caused by Instrument Drift.Instrument Recalibr & Returned to Svc

/03L-0 on 790706:while Performing Reactor Low Water Level 1 Channel Calibr,Switch 1 Found Out of Tolerance Low.Caused by Instrument Drift.Instrument Recalibr & Returned to Svc

ML19242A864
Person / Time
Site:	Brunswick
Issue date:	08/03/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19242A854	List: 05000325/LER-1979-044, Forwards LER 79-044/03L-0 05000325/LER-1979-044-03, /03L-0 on 790706:while Performing Reactor Low Water Level 1 Channel Calibr,Switch 1 Found Out of Tolerance Low.Caused by Instrument Drift.Instrument Recalibr & Returned to Svc
References
LER-79-044-03L, LER-79-44-3L, NUDOCS 7908060501
Download: ML19242A864 (1)

LER-1979-044, /03L-0 on 790706:while Performing Reactor Low Water Level 1 Channel Calibr,Switch 1 Found Out of Tolerance Low.Caused by Instrument Drift.Instrument Recalibr & Returned to Svc

Event date:
Report date:
3251979044R03 - NRC Website

text

iJ HC F OR M Jmr.

U. > NUC L E /.it RE GUL A TORI COMMISSION (7 77)

LICENSEE EV flT REPORT

[

[__l l

l l

(PLE ALE FRlNT OR iYPE Al L REGL' I N F O R M ATIO M co.T not

<u-PlGLAL1 11 1 1;GL_LJ G lx '._LB l dzj d. iLai;L -L OJ 0 OLnt 0 0

N i

n

~

w tai ss t u t.; t Lt r

t wts t c.u r r 7l91@[_0 8

0 3

7 9 g

! L }(i((_0j 5 { 0 [MO l3 2l5 l@[ 0 7l 0 6

!0 1

8 i

r

>t o i -

o' titNT D Af t 74 Ht FOH T D A T E HJ t' a '. L a ; E '; C F :;

Et r N T DF ';CRIP ilf

' ' ) r,., '. 4 !, l i 1

i o I :' ' [Whi le.per forming _PT 1.1.4PCu_ Reactor Low Water Level il Channel Calibration, [B21-LIS-N017B, switch I was found to be out of tolerance low.

The required value is l

a 3

d 12.5 inches of _ water and the as found value was 10.6 inches o f wa t.. r l

[~>

4 io t

LTechnical Specifications 2.2.1. 6.9.1.9a l

Ia lo l I J

!a i

l l

L _ __..___._.

ea o

s a.

Am,E LE Z_j i) [ I l N l S l T l R [l{jh j() lZlh [I

A l( 1)

Qj Io o

}

i a

.T.

, e m, ou lll_9 l

!l:j

[ 0_ 4 4)

[d l0l3l [L]

l0l e'I' N E *; 7 a'!I i-T1; F!

d

.Cl t

Lt?

T3 e

0 F0 j

lg l

lg g

G l 0 l 8 l 0 lg

!E_{;[g_j]

[J, [gg

[,0 0

(]

cm oc t

r:

s The only reason determined was instrument drift. The ins trument was recalibrated and l o

L ii_J Ireturned to service.

A plant modification has been eritten to replace the bi-stable I

j,

[ switches with analog ins trumen tatic,n during the 1980 refueling outage.

This new l

l in s t rumen t a tion is auch more stable and should greatly redue the drift problems now l

[being encountered.

l 2

a '

so m

F k"

.F-3 ;.t

>pr..,

i

[ E l(j [0 l i [3 [,l NA j

l Bl{

Periodic Test l

~

w At tT-4 e~

n kj 62[ L t '

2 6

.T.

I ;.((;-[

lZ (j lj,. [ '; A l

l NA l

w, i

n Ol0j. 1](.;[_ ::A j

n e

h I'

+1 a--l Zb s 7 9 0 8 0 6 0 TC)1

---

)

t-l' l'

i Ill '

(~

Ll.lf i NA

_ ___J LLLII1IIIIII!!

8 o ;

}1,{

['((7 919-457-9521 g

A. C. Tollison, Jr.