ML19211A290

LER 79-097/03L-0:on 791128,after Recalibr of P33-P001A & B During Steady State Power Operation,Drywell Torus Dihydrogen & Dioxide Analyzers a & B Indicated More than 4% Oxygen Concentration.Caused by Leakage of Air Into Analyzer

ML19211A290
Person / Time
Site:	Hatch
Issue date:	12/11/1979
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19211A280	List: ML19211A278 ML19211A290
References
LER-79-097-03L-01, LER-79-97-3L-1, NUDOCS 7912170316
Download: ML19211A290 (2)

Text

NRC FORM 366 (7 77)LICENCEE EVENT REPORT CONTROL BLOCK: l llllllh (PLEASE PRINT OR TYPE A11LREQUIRED INFORMATION) 1 6[oTil Ic I A IE 11 in 11 l@l 010101010101010101010 I@2641111ililll@l Il@7 8 9 LICENSEE CODE le 15 LICENSE NUMBER 23.laCENSE TYPE JO

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'0 1 5 VRC 7 8 60 6l DOCKET NUMBER 68 69 EVENT OATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lO l2l l Af ter re-calibration of P33-P001A and B during steady state power operation, it lIO lal l was observed that the Drywell-Torus H2 and 02 Analyzers "A zud B" were indicating lo 4lgreater than 4% oxygen concentration. The samples taken by lab instrumentation lo 5 lrevealed that the oxygen concentration was 3%.

There was no effect on the environs. l O cl This was a non-repetitive event.

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7 8 9 10 11 12 13 18 19 20_SEQUENTI AL OCCUR R E NCE RiPORT REVISION LE R 'RO EVENT YE AR REPORT NO.

CODE TYPE NO.h REl7l9[--J 0 l 9 l7 l Ml0 3ll Lll_][ 0_j yu_ 21 22 23 24 26 27 28 29 JD 31 32 K N AC ON ON PLA T E HOURS SB IT FO B.SUPPLIER MAN FACTURER l El@lZ l@

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33 34 35 36 3/40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O l The cause of the occurrence has been attributed to air inlerkage to the annlyzers li i j causing them to observe a higher than actual reading.

The Eines were tested and l, 7 lall identified leaks repaired.The analyzers were re-calitrated and returned li 3 lto service.

ll1 4 7 8 9 80 ST S% POWER OTHER STATUS IS O RY DISQVERY DESCRIPTION l1 l51lE @

0l 9 l 8l@l NAll B l@lObservation lACTIVITY CO TENT RELEASED OF RELE ASE AMOUNT OF ACTIVITY LOCA10N QF RELEASE NAllNel] @ [_Zj@l 1 6 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBE R TYPE DESCRIPTION W 10 l 0 l 0 l@l Z l@l NA PERSONNEL INJU IES mSCR P1,0~8 1592 236 NUM ER NAl10l0l0l@l1 a 7 8 9 11 12 80 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPil0N b [Z_j@lNAl7 tl 9 to 80"o'ESCniPriON@

7 91217 0 3/4,l'*NnC usE ONtv iSSu@lNAlllllllllll;2 o 7 8 9 10 68 69 80 E NAME OF PREPARER PHONE**

1-NARRATIVE REPORT Georgia Power Company' Plant E.I. llatch Baxley, Georgia Reportable Occurrence Report No. 50-321/1979-097 Af ter re-calibration of P33-P001A and B during steady state power operation analyzers "A and B" at 98% power, J t was observed that the drywell-torus H 022 were indicating greater than 4% oxygen concentration. Actual drywell samples revealed the oxygen concentration was 3%.

There was no affect on the environs. This was a non-repetitive event. The cause of the occurrence has been attributed to air inleakage to the analyzers causing them to observe a higher than actual reading. The lines were isolated and pressurized, several leaks in the panel were found and repaired. The analyzers were re-calibrated and returned to service. This problem is only applicable to Unit I because the Unit II drywell is. not inerted. The analyzers are not utilized on any other safety related system on either unit.

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