05000237/LER-1983-080, Supplemental LER 83-080/03X-1:on 831124,offgas Log Rad Monitor 2-1705-A Delivered Offgas High Alarm & High Alarm Spiked & Drifted Downscale.Caused by Burned Out Resistor. Power Supply Installed & Monitor Calibr

Supplemental LER 83-080/03X-1:on 831124,offgas Log Rad Monitor 2-1705-A Delivered Offgas High Alarm & High Alarm Spiked & Drifted Downscale.Caused by Burned Out Resistor. Power Supply Installed & Monitor Calibr

ML20087L220
Person / Time
Site:	Dresden
Issue date:	12/20/1983
From:	Scott D, Wojtulewicz T COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
84-217, LER-83-080-03X, LER-83-80-3X, NUDOCS 8403270089
Download: ML20087L220 (3)

LER-2083-080, Supplemental LER 83-080/03X-1:on 831124,offgas Log Rad Monitor 2-1705-A Delivered Offgas High Alarm & High Alarm Spiked & Drifted Downscale.Caused by Burned Out Resistor. Power Supply Installed & Monitor Calibr

Event date:
Report date:
2372083080R00 - NRC Website

text

- _ _ _ _ _ _ _ _

>m '

LICENSEE EVENT REPORT CONTROL BLOCK: l l I (rLEASE PRINT OR TYPE ALL I!EQUIRED INFCRMATION) 1 l 1 l 6

lh l 0 l 819l l I lUCENSEE

,7 L l D CODE l R l S14l 2 15l@l 0 l 0 l - uCENSE 1 0 lNUMSER 0 l 0l 0l 0 l - l 0 25 l 026 l@l4 l1l1l1l1l@l57 CAT UCENSE TYPE J0 l

Sd l@

I CC.?T ME 3$ "es60 l L @l 0 l 510 l 0 l 0 l 2 I 3 l6d7 hl69 1 l11214 l 8 l 374l@l751 l 2REPORT l 2 lQATE 0 l 8 l1SQ l@

7 8 61 DOCKET NUMB ER EVENT QAT.

EVENT DESCRIPTION AND PROSABLE CONSEQUENCES h to tal l During normal operation off gas log rad monitor ?-1705-A delivered off-gas hi-hi i lo is t I alarm and h1 alarm, spiked and drif.ed downscale. The safety significance was I Iol4l l minimal because the redundant monitor 2-1705-B continued to operate normally. ThisI t o i s l' I occurrence constituted no hazard to public health or safety. This occurrence is I lo is l I the first failure of the off-cas radiation monitor'n nnver nunniv- l 1017] l I t o tal l l 7 8 y 80

$$o'E ##"$5 C0 si8COEE COuPONENT CooE $[8Eo'E sV E E 10191 7 8 IM IC lh lE lh lc lh II lN IS lT lR lU l h lX l h IZ l h 9 10 11 12 13 18 19 20

. SEQU ENTI AL OCCURRENCE REPCRT REVi3 ION ggfpg EVENT YEAR REPORT NO. COOE TYPE N O.

@ ,a(g I 81 31 l-l 10!8l01 1/l 10131 lxl L-J ll i 21 22 23 24 26 27 3 3 30 31 32 K AC ON ONP NT E HOURS S8 iT POR 8. $ PP MA USACTURER 181@lzl@ l35z i@ l36 zl@ 10 1 01 01 01 INi@ I42V l@ INl@ l c l 0 ! 810l@

33 34 37 40 41 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 tilo l l Cause of power supply failure was a burned out resistor. Resistor (R142) was a l 11 111 I bridge network component. Since the Unit 2 monitor had been restored by use of I I1 12 I l the Unit 3 power supply, the repaired power supply was installed in the Unit 3 I

~

li 6 3I l monitor. After installation, the Unit 3 monitor was calibrated, functionally l 11 14 l 1 tested and returned to service. I 7 8 9 80 TA '6 POWER OTHER STATUS SO RY OISCOVERY QEscauPTION 11151 Wh I O! 416 lh! N/A l (_Aj hl Ooerator observation l AfTIVITY CO TENT LEt.EAsEO CF RELEASE AMOUNT Of ACTIVerY LOCATION Of RELEACE ltl6llZl@ y gl N/A l l N/A l 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER CESCRIPTION l# i l 7* l' l 01 0 l 0lhlTYPEZlhlN/A " "

I PERtcNNE t iNauNits NUv8ER DESCRIPTION 11 l 8a 9l l 0 l 0 l 0 lhl12 N/A l 7 11 80 LOSS OF OH OAMAGE TO PACIUTY $

TYPE DESCRIPTION U 8402270089 831220 li l 91 l Z lhl10 N/A PDR ADOCK 05000237 l 7 s 9 S PDR 80 I!SU g O a 12 8I 9o f lN fhl ESCRIPTION 7 10 N/A l 68 69 llllllllllll1j 80 5 NAME OF PREPARER o % 1ed CZ PHONE: (815) 942-2920 X 523 2 ,

I

_ m---o- --.c

r - -

a , ,,.

. . ~ . . .

.~~ .e

• .~ ,

. ; - , + - "

, i

. / .

, 2

, SUPPs' EFENT,TO DVR *

,, , 1. c,  : . .

. . =t

~,

DVR No. ' '

r- -

.- STA' utiiT. YEAR -NO.

<j ~ ~

w

~

ti - 12 <

2 - 83 157 l .c ' PART I l, TITLE OF,'EVENf'. ._ d -

OCCURRED i, '

'p / ,,

11/24/83

, f ,

2320 --

r, -*

Chan'nel'd of SGas Monito-Tailure " ~~

DATE TIME

'r REASON FG4 SUPPLEMENTAL REPORT, - .

> i -

To do.cu'nent root catise which was unknown at time of initial report.

. e . - -

f.. - - , _ .

,. /

g- N* et s ~

- , _?

e N .

PART 2 l

. ' ' ACCEPTANCE BY STATION REVIEW

->> c

~

hblu/

Q l lDkin ~

3Is M N . ilidb(tl i j SUPPLEMENTAL REPORT APPROVED .. -

M iz ,i AND AUTHORIZED FOR DISTRIBUTION

- / 8 /7 /

, STATIO Suft%INTENDENT DATE e

?

J-e a '

9

+

h a g .

p

? m

+

e d

4 4

e w

/

• 1 F

.e 4

4 lo q. ig

P'

. 4 .

, '] Commonwealth Edison 4md

) Dresden Nuclear Power Station

_ _ _ . _ R.R. f/1 g f Morris, Illinois 00450 (j Telephone 815/942-2920 March 7, 1984 DJS Ltr #84-217 James G. Keppler, Regional Administrator Region III U.S. Nuc1 car Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 Reportable Occurrence Report #83-80/03X-1. Docket #050-237 is being submitted to your office in accordance with Dresden Nuclear Power Station Technical Specification 6.6.B.2.ib), conditions leading to operation in a degraded mode permitted by a limiting cotidition for operation or plant shutdown required by a limiting condition for operation. This supplemental report documents root cause of failure which was unknown at time of initial report.

(4 D. J. Scott Station Superintendent Dresden Nuclear Power Station DJS/jmt Enclosure cc: Director of Inspection & E forcement Director of Management Information & Program Control U.S. NRC, Document Management Branch File /NRC MAR 2 2 y t

1saa \