ML19263C923

LER 79-001/03L-0 on 790103:during Operation,Drywell Atmospheric Radiation Monitor Gas Channel (RMV-RM-4C) Failed Downscale.Caused by Detector Failure Caused by Moisture in Detector Chamber.Detector Replaced;Chamber & Lines Dried

ML19263C923
Person / Time
Site:	Cooper
Issue date:	01/22/1979
From:	Phillips D NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19263C920	List: ML19263C919 ML19263C923
References
LER-79-001-03L, LER-79-1-3L, NUDOCS 7903120351
Download: ML19263C923 (1)

Text

'N RC 'E Oh M 366 U. S. NUCLEAR REGULATORY COMMISSION (F7H g,,,,,, LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6 l o l 1 l lN 7 8 9 ELICENSEE lC lPCODE lR l1 !@l0 h l-l 0 l LICENSE 14 15 l 0 I-l 0 0 l o25 @l26 4 l LICENSE 0 l 0NUMBER 1 l1 l1l1TYPE JO l@l$7 CATl

$8 l@

CON'T o i 8

'bEPOR S gC lL l@ 61 0] 5 l DOCKET 0 l 010 l2 9 868@l690 l 110 l 3 l 7 l 9 l@ 0 l1REPORT EVENT DATE 74 15 l2 l2DATEl7 l980l@

7 60 NUMBER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 [During normal operation the drywell atmosoheric rndineinn nnnienr g,c ch,nnn1 (RMV-RM I lo l3] 14C) failed downscale. Technical Specification 3.6.C.2 requires the arnosnhoric rndi- l o 4 ption monitoring a" stem to be operable during power operation. Thnro hna bonn eten nveu l o 3 fous events of a similar nature (LER 77-67 and 78-2). The particulate and iodine chan- I o c pels of the monitor were operable. This event presented no adverse consecuences to o 7 public health and safety. I I

o a 80 7 8 9 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SU8 CODE COMPONENT CODE SUBCODE SU8 CODE 10191 IaIal@ W @ W @ IT in is im IR in l@ W@ l_zj @ 13 18 19 20 7 8 9 10 11 12 SEQUENTIAL OCCUR R E NCE REPORT REVISION

_ EVENT YEAR REPORT NO. CODE TYPE N O.

L

@ ,a=E R  ; 'RO I 71 9] l- l Ol 0 11 d l 0l 1l d l-l [9_j 32

_ 21 22 23 24 26 21 28 29 30 31 ATT ACHM E NT NP R D-4 PRIME COMP. COMPONENT ACTION FUTURE EFFECT SHtJTDOWN MANUFACTURER TAKEN ACTION ON PL ANT METHOD HOURS SUBMITTED FORMbu3. SUPP LI E R l33A l@l34 F @ y@

JS lZl@

36 l0 10 10 31 0]

40 lN lh 41 42 ih [_Ajh 43 l N 3l,d@

44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l

1 o i The failure of the Nuclear Monsurn-one enrp MnAn1 p w 73s-ir unA42ti~ Mnniene 4e 11 111 l attributed to detector failurn cnuand by mniernen in *he detecter ch rber. Th" da-  !

jtector was replaced and the detector chamber and sensing linec were dried out. A l j

, 3 l heater was installed in the monitor to keep the sample collection system above the g,[4l l dew point of the sample to prevent recurrence. 80 l

7 8 9 ST S  % POWER OTHER STATUS DISCO RY DISCOVERY DESCRIPTION 32 i 5 W@ l ll 0l 0l@l NA l lA [@l Upon receipt of Instrument Failure Alakm A TlVITY C TENT RELEASED OF RE LE ASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE NA l l M l

[ 1 l 869 l [2] @ 10l Zl@l 7 11 44 45 80 PEHSONNEL EXPOSURES NUMBE R TYPE DESCRIPTION l

l i l 71 1010 Ol@lzl@l 13 NA 80 7 H 9 11 12 PERSONNE L INJUHIES NUYSIR DESCRIP TION l

7 i R 8 9 1010101@l12 11 NA 80 L OSS OF OR DAM AGE TO F ACILITY TYPE DESCRIPilON I

i o Lzj@l Nz 80 8 9 10 7

PUBt ICITY ISSUEp D E SC RIP TION 79031%rs9 N RC USE ON L Y

• 2 o [_Njhl NA IIlllll1ll l12 g 9 68 69 80. &

7 to D. L. Phillips PH ON E : 402-825-3811 E, N AYE OF PREPARER