ML17252B516

LER 80-024/03L-0 for Dresden, Unit 2 Re Drywell Oxygen Concentration Indication Failed Downscale in Violation of Tech. Spec. 3.7.A.6.d

ML17252B516
Person / Time
Site:	Dresden
Issue date:	08/14/1980
From:	Scott D Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
DJS LTR 80-5 LER 80-024/03L-0
Download: ML17252B516 (2)

Text

Commonwealedi,sori Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450

Telephooe 815/94~~l\l\W nnttt1 fl1l &OPl at~ August 14, 1980 DJS LTR 1180-5 James G. Keppler, Regional Director Directorate of Regulatory Operations - Region III U.S. Nuclear Regulatory Conunission 799 Roosevelt Road Glen Ellyn, IL 60137

. ~~*

Reportable Occurrence Report lf.80-24/03L-0, Docket)tdS0-237 is,......,./

• being submit.ted to your off ice in accordance with '-D.r.,g.§,defl<>-ifu"clear Power Station Technical, Specification 6. 6. B. 2. (b), condl.tions leading to operation in a degraded mode permitted by a .limiting condition for operation or p~ant shutdown required by a **limiting condition for operation.

Station Superintendent Dresden Nuclear Power Station DJS:lcg;

. Enclosure cc: Director of Inspection & Enforcement Director of Management Information & Program Control U.S. NRC Document Management Branch File/NRC

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._, . ~., _, ~CENSEE EVENT REPORT .

~tN"i-'~dL BLOCK: I 1!--~~-----~--~-----6\..!.)

I 1-r/0 ' ' (PLEASE PRINT OR TYPE AL.EQUIREO INFORMATION) ~.

E . 8 I I I 1 ID IR Is 9 . LICENSEE CODE i-2' 1010

. 14 15

'° f I - I 0 I 0 I 0 I 0 I 0 I- I0 I0 IQ)l4 LICENSE NUMBER 25 26 11 11 11 LICENSE TYPE 11 101 I I© 30 57 CAT 58 a&2. -----~- -- - .

U-2.J8 ~~~~~ -~©Io 1s 60 61 10 10 DOCKET NUMBER pf p f 101 o I 7 12 11 ! 8 Ib IG)I oI s I 1 l s I 8 I o I© 68 69 . . EVENT DATE 74 75 REPORT DATE 80 .*

EVENT DESCRIPTION A~D PROBABLE CONSEQUENCES @ . .

I Dtiring normal operations, drywell oxygen concentration indication failed downscale in OlJ I violation of Dresden Tech. Spec .. 3.7.A.6.d. Safetyconsequences were minimal because I drywell oxygen .conc*entration was ':well below ,.4% before indication failed and oxygen

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• I concentration .. readings taken on a portable .analyzer "were available upon *request.

I Similar events:. 80-7 /031-0, .80-1/031...:0

• 80

.SYSTEM CAUSE CAUSE COMP. VALVE e

CODE CODE SUBCOOE COMPONENT CODE .SUBCODE .SUBCODE m:r 8 11 9

ID I@ ~@-L~@

10* 11 12 J13 r_1 N 1s 1T 1R 1u 1 18

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19 t:J@*

.20 SEQUENTIAL 'OCCURRENCE *REPORT 'REVISION*

6 LER/RO *cEVENTYEAR . REPORT NO. . CODE 'TYPE

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~ REPORT NUMBER .

I 21 8 0 I I .

22 I I *yo

.23 ' -24 '

1 2 *1 4

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.26 J7[ -

' ' .27

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28 29 '

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• ,42 ' -43 44 COMPONENT

'MANUFACTURER.*..- - .

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47

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. CAUSE DESCRIPTION AND CORRECTIVE ACTIONS.@* .

1 I 0 I I The reason for the downscale reading .was -excessive'.' .... ,*high :temperature. of the oxygen . I DIJ ,I analyzer cell caused *by faiiure of a *temperature sensing *switch. 'The temperature ~swi<tth,.1 IIJ I Fen~al:

• Inc., .No. lS00-0, was *.rep'laced ~. *correet~~temperatu:re cbntroi ~and accurate

• J:D I oxygen *indica tiori.::. resulted.

El.a 9 1 80

. FACILITY . tJQ\ METHOD OF * . ~

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IIJ STATUS

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% POWER 01 61 71@1

. .QT,11ER STATUS N/A

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. DISCOVERY QbDISCOVERY. DESCRIPTION

.l~J@_l_op_e_r_a_to_r_._s_e_rv_a_t_i_on_ _ _ _. _ _ ____,I

' 8 9 10 12 1'3 ,44 ,_45 ,"46 80

ACTIVITY .CONTENT Q\ ~ .

r;;RELEASEO OF RELEASE AMOYNT OF ACTIVITY LOCATION OF RELEASE ~

~ L.~J@ Lll@)I NA I -- .___N_IA_ _ _ _ _ _ _ _ ___,,_ _...... t ____

' 8 9 10 11 44 45 80 PERSONNEL EXPOSURES -r:;;:;.,

NUMBER {.;::;\TYPE. t:;;;\ DESCRIPTION

~jOIOIOl~~------N_J_A___________________~

8 9 11 12 13 PERSONNEL INJURIES t:'::\

NUMBER DESCRIPTION~

1010101@ N/A 9 11 12 80 LOSS OF OR DAMAGE TO FACILITY {43)

Llil TYPE L_:_j@

DESCRIPTION

.

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. A 8 9 10 80 PUBLICITY f,;;;\ NRC USE ONLY ISSUEOt,;:;\ DESCRIPTION~ C>

III UJ6 N/A . I I I. I I I I I I I I I I~

8 9 10 68 69 ' so.;

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