ML20150E140

/03L-0 on 781020:during Refueling Surveillance, Noted That Steam Generator 1B Level Channel 1L-548 Had Drifted Above Tech Spec Accuracy Limit.Caused by Instru Drift of Transmitter Instru Subsequently Recalibr

ML20150E140
Person / Time
Site:	Zion File:ZionSolutions icon.png
Issue date:	11/17/1978
From:	Hansen P COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20150E133	List: ML20150E131 ML20150E140
References
LER-78-107-03L, LER-78-107-3L, NUDOCS 7812110159
Download: ML20150E140 (1)

Text

NHC F OllN! 36G U. S. NUCLL AH llLGULA10llY COfAIAlbLtOfd (7 77)

LICENSEE EVENT REPORT CONTROL ULOCX: l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INf'ORMATION)

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Ll 7l Loot I !S l 1 !hltb 0 l n l- l 0 LICEN:,6 14 l0 l nNuvutal O! o l -l0 l 02b h ,4 ;et l1uctroll 1l1 l1 hlbi LAl 50l@

TvPL Ju CON'T 10l1l , cf l L l@{ g j 9l0 l Ol0 l pl9 l5lhfl l O ! '! O !7 !O !@!iS 1l 1 ! 1l7 l 7 ! Rlh 7 W 00 69 DOCKET NUMuEH 8A L') kVENT OATE #4 HLf'OHT D A I L bV Et/ENT DESCRIPTION AND PROBAULE CONSEQUENCES h Io12llDurina refuelina surveillance, mechanics discovered that steam aenerator l lo l3 l lB l level channel (lL-548) had drifted hiah by 2.15?. Loop accuracy is 29.l l o 141 IThis is non-conservative for FS/FM mismatch with low S/G level and Low-Lowl 10151lS/G level Rx trips as presented in Table 3.1.1 of the Tech. Specs. As the I l o 16 I [ redundant channels were nnnrnblo nna avniinblo. *bn kon1th anA nnfety of I l o l 71, l the publ i c were nnt affected. I 10181 I l 7 8 9 .

60 SYSTE M CAUSE CAUSE COMP. VALVE CODE CODE SUSCODE COMPONENT CODE SUSCODE SUB000E icl[

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9 10 11 12 13 16 19 20 SE QUENTI AL OCCURRENCE REFORT REVIStON LE R 'RO EVENT YE A R REPORT NO. CODE TYPE N O.

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. ACTION F LIT U R E EFFECT SHUTDOWN ATTacurrNT Noon.4 Potvc COYD. COu'ONENT TAKEN ACi c. UN PLA*; T METHOD HOURS SUC'.t!TT E D F OR!.i bus. CU'"UEP " t M 'L'F AC TU * * : ft h.3._j[8)I 34 "lh lsa " l@ I Ih ,j n l n l n l 0 _l 40 lnl@ ly l@ jn l@ l P h l 2 h l(

Jo. J/ di Q 43 d4 47 CAUSE DESCRtPTION AND CORRECTIVE ACTIONS I110lIFischer Porter level trahnnit+ or model E1 tn? A 05t'nTmpnn_np dri F4 ea nut of l 11 11l ltolerance. The instrument was re-calihrated. #unctionallv checkna. nna I l3 l7i ] returned to service. Data on drift for these instruments are beina connilcid .

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STA LS N POWER OTHER STATUS i CD F DISCOVERY DESCRIPTION t i l t,I l H l@ l Ol 0 l Ol@l tiA l l n !@l Furveillance Testina l ACTLVITY CO TENT RELE ASED OF MELE ASE AMOUNT Or ACTIVITY LOCATION OF RELE ASE j MA "A i t Ic8 l9 ["J @ I" l@[

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