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 J Commonwealth Edison Co
To:	Keppler J G 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 nnttt1 fl1l &OPl 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 shutdown required by a **limiting condition for operation.

DJS:lcg; . Enclosure Station Superintendent Dresden Nuclear Power Station cc: Director of Inspection

& Enforcement Director of Management Information

& Program Control U.S. NRC Document Management Branch File/NRC .*4o::/. 2 \

_,., .... 11,_ '7"71 ._, . _,

EVENT REPORT .

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

' E I I I 1 ID IR Is i-2' 1010 '° f I -I 0 I 0 I 0 I 0 I 0 I-I 0 I 0 IQ)l4 11 11 11 11 101 I I© . 8 9 . LICENSEE CODE . 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 a&2. U-2.J 8

---.

-

1 s 10 10 p f p f 101 o I 7 12 11 ! 8 I b IG)I o I s I 1 l s I 8 I o I© 60 61 DOCKET NUMBER 68 69 . . EVENT DATE 74 75 REPORT DATE 80 .

• EVENT DESCRIPTION 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 m:r 8 I drywell oxygen .conc*entration was ':well below ,.4% before indication failed and oxygen ' ' ' *I concentration

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

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

• .SYSTEM CODE 1 1 ID I@ 9 10* 6 LER/RO *cEVENTYEAR REPORT I 8 I 0 I NUMBER . 21 .22 CAUSE CAUSE COMP. VALVE CODE SUBCOOE COMPONENT CODE .SUBCODE .SUBCODE J r_1 N 1 s 1 T 1 R 1 u 1 e t:J@* 12 13 18 19 .20 11 SEQUENTIAL

'OCCURRENCE

• REPORT 'REVISION* . REPORT NO. . CODE 'TYPE I I *yo J7[ -*1*0 1 3 1 t.:J *'1=J .. .23 ' -24 ' .26 ' ' .27 :28 29 ' .30 '.31 ' 32 80 0 Vifr@

.*

COMPONENT

'MANUFACTURER.*

.. --. 33 34 ' 35 ,. ' 36 .37 ' *40 ' 41 *,42 ' -43 I F I 0' t 8 11. '* ; 44 47 . 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

!IIJ I

• Inc., .No. lS00-0, was *.rep'laced cbntroi accurate * !J:D I oxygen

• indica tiori.::.

resulted.

!El .a 9 . FACILITY . tJQ\ METHOD OF * . STATUS % POWER . .QT,11ER STATUS \::;:/ . DISCOVERY QbDISCOVERY.

DESCRIPTION tIIJ I 01 61 71@1 N/A I

_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\ . 1 80 rr;;RELEASEO OF RELEASE AMOYNT OF ACTIVITY LOCATION OF RELEASE Lll@)I NA I --.___N_IA _________

__,, __ ...... t ___ _ ' 8 9 1 0 11 44 45 80 PERSONNEL EXPOSURES -r:;;:;., NUMBER {.;::;\TYPE.

t:;;;\ DESCRIPTION

___________________ 8 9 11 12 13 PERSONNEL INJURIES t:'::\ NUMBER 1010101@ N/A 9 11 12 LOSS OF OR DAMAGE TO FACILITY {43) TYPE DESCRIPTION Llil L_:_j@ . . A 8 9 10 PUBLICITY f,;;;\ ISSUEOt,;:;\

[III UJ6 N/A 8 9 10 A----80 80 NRC USE ONLY C> . I I I. I I I I I I I I I 68 69 ' so.; 0