05000220/LER-1980-005-01, /01X-0:on 800203,engineering Evaluation of GE SIL 299 Required That low-low Setpoint for Reactor Core Water Level Be Raised 20 Inches.Caused by Efforts to Precisely Measure Actual to Indicated Water Level Difference

/01X-0:on 800203,engineering Evaluation of GE SIL 299 Required That low-low Setpoint for Reactor Core Water Level Be Raised 20 Inches.Caused by Efforts to Precisely Measure Actual to Indicated Water Level Difference

ML18037A240
Person / Time
Site:	Nine Mile Point
Issue date:	02/15/1980
From:	Falise M NIAGARA MOHAWK POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML17053B420	List: 05000220/LER-1980-005, Forwards LER 80-005/01X-0 05000220/LER-1980-005-01, /01X-0:on 800203,engineering Evaluation of GE SIL 299 Required That low-low Setpoint for Reactor Core Water Level Be Raised 20 Inches.Caused by Efforts to Precisely Measure Actual to Indicated Water Level Difference ML18037A240
References
LER-80-005-01X, LER-80-5-1X, NUDOCS 8002250604
Download: ML18037A240 (6)

LER-1980-005, /01X-0:on 800203,engineering Evaluation of GE SIL 299 Required That low-low Setpoint for Reactor Core Water Level Be Raised 20 Inches.Caused by Efforts to Precisely Measure Actual to Indicated Water Level Difference

Event date:
Report date:
2201980005R01 - NRC Website

text

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(PLEASE PRINT OR TYPE A QUIRED INFORMATIONI 6

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2 04~09 09 LICENSE NUMBER for rea'ctor core water level be raised 20 inches.

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indicated that:for a majority of accident scenarios s stem desi n

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,60 6'I DOCKET 71UL<BER 68 69 KVEFIT DATE 74 7S REPORT DA'IE EVENT DESCRIP'TION ANDPROBABLE CONSEOVENCES 10 An Engineering, evaluation of QE SIL 299 re uired that Lo Lo Lo Set oint water breaks.

However, conservative evaluation indicated that i in configuration for the Lo Lo Lo level instrumentation ma reclude. the

~99 setpoint from being reached durin a LOCA.

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CAUSE O'ESCRIPTION ANDCORRECTIVE ACTIONS 27 4

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evaluation of GE SIL 29 En ineer f

measure actual to indicated water level difference due to heat u

revealed that the Lo Lo Lo set oint mav not be reached durin a

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LOCA if the indicated to actual level difference was 1ar e.

METIIDDOF DISCOVERY DISCOVERY DESCRIPTION ~32

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. M,Y. 13202/TEL PHOEBE (3l5) 4?4 ~ 15l 1 Fe&Matu( 15, 1980 l4. Boyce ~an,, %ee~a hMed S~eh MuCCem Regulate/uj ConmhhLon - Regin 7

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.Ku~g o( Pusan, Pennhgtvcuua:

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Cocher Mo. 50-220 MR 80-05 0eae A., Ceini The GE SIL 299 ox&urn>g p>e pohhNZe elm ~ uIatec ZeveL ~wkmmeI 4x-aion indication ena necelved on Juke:30, 727e.

A PoILC 27 evaQooaion eno kiiaiceed 2o daaenmine aaa inpUumdono o

ihe di$ $enence in ec2rgi eo ~di~ed <<~

eeaevea on eae projected PCT e

<kuabv3 por~ed LOCA'o II Zt Iv I v J

"v vv' t

PCT'h ueutd nok be h~~u.gcasCbg atI(erat'ed (4..e.,

dPCT<20oF).

Thehe raehuLts appeaced coeskeient isis ~ Isaiah t23ouM be expmted hatce dumog 4~e acme<, ~~~on m.>~veLy ~aha and I~et levy in-h4~eM~n heatup <~h We ahhociated wmcuuutcgr w hfoia S4.nce khe cafcL~mnh ~~d~ed no h~eigeuC pnuMem exQCed,

$ onmaC t~e-up, uut@~ and con~ence torah compfsted on a AIo~~y bah~

on October 14, 1979. ---Ro )uta6>~aeCcaafaeth~uixed.

Ah a /iehuLt o$ the Any Ce/tm TN mod4.gcakionh, W Fnghieewng IAIah m pmcehh os devsCopug ~uved co)re ~w levy moeu!o~~g capab4.-

NQeh.

Ah a aeh~

o$ 4fa4 eItgmeeAu~g efgoeC and mo/Ie pneeiseXy meahuce, Ae aMutL W wtNcated tcn++eP2. ZeveL N,$ ~eeence

.due Co heat up,

- W-em-Nbeovmed-tfux4 otI 4he cvceenC h2/harem, ~i4; emed LLL may noC be >reached ~f Die 4.ndicated A ac4uK uatw Covet'.

d4.()menace

~cab ~e duecng a poh~ed LOCA.

An mtafyh~ wnh ~~imbed A deteeacne Ne e$ $e& o$ Aehe~n&~n heatop-oa6rbied Ln GE SlL 299 on. PCT'h hmCuding Che nevhg discovered.

geometric conggi~on pMKemh.

Thehe anakjheh 4.need Chat (oa a majo~g o( acu'.dent hce~h; highCem dehorn dM noC pweMde LLL warm ZeveX ~~Ann..

HoaevePI,,

$oa heal hieam and I~m bteaI2h,

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Bogce Gei.et.

Feb g 15, 1980 pagL 2

conjewative. evaLua4ion o$ avacLage data i~ukcated Chat Che dehorn o$

'ieI LLL-~Men. ZeveL inNcakcon h wMunentatcon may peecfude Nm popes.'(num bake wenched.

1bn,e dabuXed uuGgem o$ ~pi~ 4enpv~e, eea~e ioaCec level and pneb~urce nag dhow LLL levy w~dk ca@& i<<~auld 4l e

DPL fllRC W tRlfJ nok be 4cglHAcd lkte 40 nohJSLC heAGCoc j&cbhOhe de

~-Ho:Ivven.,

baaed on avaMabte data LC its concluded ~ a ae6kMbnatiun o$ Ae. LLL h&po~M im negated.

Thee anahJees mme ebmpCeted on'Feb',

1980. 'h@

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Jrou45, Samu Ba~ekt Executive V~ce Paseide~<

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