05000334/LER-1979-041-03, /03L-0:on 791004,after Control Rod Bank D Was Withdrawn Several Steps,Analog Rod Position Indicators Demonstrated All Rods within +/- 5 Steps of Each Other. Caused by Instrument Drift.Indicators Recalibr

/03L-0:on 791004,after Control Rod Bank D Was Withdrawn Several Steps,Analog Rod Position Indicators Demonstrated All Rods within +/- 5 Steps of Each Other. Caused by Instrument Drift.Indicators Recalibr

ML19254F500
Person / Time
Site:	Beaver Valley
Issue date:	11/01/1979
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19254F497	List: 05000334/LER-1979-041, Forwards LER 79-041/03L-0 05000334/LER-1979-041-03, /03L-0:on 791004,after Control Rod Bank D Was Withdrawn Several Steps,Analog Rod Position Indicators Demonstrated All Rods within +/- 5 Steps of Each Other. Caused by Instrument Drift.Indicators Recalibr
References
LER-79-041-03L, LER-79-41-3L, NUDOCS 7911090540
Download: ML19254F500 (1)

LER-1979-041, /03L-0:on 791004,after Control Rod Bank D Was Withdrawn Several Steps,Analog Rod Position Indicators Demonstrated All Rods within +/- 5 Steps of Each Other. Caused by Instrument Drift.Indicators Recalibr

Event date:
Report date:
3341979041R03 - NRC Website

text

-

s U. S. P/ JCLE AR REGULATORY COMMISSION NRC PORM 366 mm LICENSEE EVENT REPORT CONTROL BLOCK: l l

l l

l l

lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) l P l A l B lV l S l 1 l@l 0 l0 l-l 0 l0 l0 l 0 l0 l-l0 l 0 l@l4 l1 l1 l1 (1 l@l l

l si car se @

o 3

4 9 UCENSEE COOg to tS UCENst mi,ueEM 2$

2e ucENSE TvPE 40 CON *7 IIIII 1"Rc L l@l 0 l 5 l C l 010 l 313 l 4 @l II 010l 4l 7l 91@l1 l 1 l 0 l 1 l 7 l 9 l@)

7 8

M 68 OOCK ET NUMS ER 63 69 EVENT DATE 34 75 hEPORT DATE 80 EVENT CESCRIPTION AND PROBA8LE CONSEQUENCES h [At 0700 hours0.0081 days <br />0.194 hours <br />0.00116 weeks <br />2.6635e-4 months <br /> Control Rod Bank D was withdrawn several steps to a demand position ofl o :;

C 1212 steps. At 0730 hours0.00845 days <br />0.203 hours <br />0.00121 weeks <br />2.77765e-4 months <br />, the Analog Rod Position Indicators were indicating all of [

Ithe Bank D rods were within +/- 5 steps of each other, although 5 of the Bank D rodsl O 4 twere slightly less than the required 200 steps. Movable incore detectors were used [

O s O 6 fto determine that no misalignment of the rods in Bank D existed.

Repetitive. The f

I'5Til lhealth and safety of the ceneral oublic were not ieopardized as the rody were not I

I o

a Inisaliened.

OCE COO

$ C E COMPONENT CODE SUSCODE E

lR l B lh W@ W@ lI lN l S l T l R l U l@ y@ l Z l@

O 9 e

e iO si i2 i3 is i9 20 SEQUENTIAL OCCURRENCE REPORT REVISION LER/Ro EVENT YEAR REPORT %.

CCOE TYPE NO.

@,RE g l287l 9l

{)

l 0l4 l 1 l y

l0l3l lL l l--.)

l0 l 22 23 24 26 27 28 29 30 31 32 N ACT C 0 P T

M TH HOURS 22 SE i FOR 8.

SU E

• MANUFAC RER lE l@lZ l@

l Zl@

W@

l 010 0l0l g@

lY]g J @

lM l0 { 3 l5 l@

33 34 35 36 37 40 el 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h ITT6 l IThe incident resulted from indication instrument drift. The indicators were l

@ Irecalibrated and returned to service. A channel check verified all rod position I

indicators were within ti.s allowable 12 steps of the demand position.

I i 7 fiTT1 I I

i 4 I

I so 9

ST U

%PCWER OTHER STAWS S O EH OISCOVERY DESCRIPTION l E !@ l0 l 4 l 7 l@[

F/A l

W @l Operator observation l

i 5 Co$ TENT f s ey:TY RELEASED OF RELEASE AMOUnr/ OF ACTivlTY LOCATION OF RELEASE W W h [2,j@

N/A l

l N/A l

e 9 10 n

44 as so PER$0NNEL EXPCSURES NUM6ER TYPE

DESCRIPTION

ITlT) l 0 l 0 l Ojhl Z l@l N/A l

,ER So~~ E aN,UR'iE S CESCRiPriONh NuMeER E 10l0l01@l N/A l

t 3 )

80

[

-) [. (

7 8 9 li 12 LOSS OF on CAU.CE TO FACILITY TYPE DE SCRIPTION

@ W@l N/A F

S 9 to 80 I

RIPTION

@ SSUED @ OE W

l N/A I

lllllllllllIl5 68 69 80 5

=

7 8 9 10

.412-643-1258

?

UR

• o-PHCNE NAME OF PREPARER

. -u 0 9 0 s54