ML20084C580

Preliminary AO 50-219/74-48:on 740927,main Steam Line Low Pressure Switch RE23A Found to Trip at Pressure Less than Min of 860 Psig.Caused by Switch Repeatability.Ge Submitted Info to Reduce Setpoint

ML20084C580
Person / Time
Site:	Oyster Creek, 05000000
Issue date:	09/30/1974
From:	Carroll J JERSEY CENTRAL POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20084C561	List: ML20084C557 ML20084C580 ML20084C598
References
AO-50-219-74-48, NUDOCS 8304080110
Download: ML20084C580 (5)

Text

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To: Jnnas P. O'Roilly D.irectorate of llegulatory Operations i Region I. )

63) Park Avenuo

)*.ing of Pruusic, Pennsylvania 19406~ \,

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l .* Fro. : Jerecy Central Poue-e f, Li,qht Cor:pany Oyster Cru!( f:ucicar Gon:_cating Station l Docle c. f 50-219 Porked River, lleir Jett.cy 08731 i I

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i St6jcet.: Abnormti Oceterance Report Ho, 50-21?/74/48 '

i The following is n prc1htinary report being sub.itted .,,

in corplianco with the Tcchnical Spcciflections, '

paragraph 6.6,2, -

i Prdir,icary Approval:

/ ) hrsb{ 9/30/74 -

j T. Carroll, Jr, (( Dato cc: lir. A. Ginebr.sno 8304080110 741004 PDR S

ADOCK 05000219 ppg II

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O O Initir.1 Tclephone Date of nep;21t Dato: _9g7/74 Occurrenco:. 9/27/74 Initial ifrittcn ,

Tlt.m of- ,

Report Date: Occurrence: 1325

__ 9/30/74 _

OYSTER CRC 1T. NUCi. EAR f.ENTAATING STATION FORKED RIVER, Nir.! .)D.SEY 0u731 I

Abnorcal Occurrence Report No. 50 4 19/74/_4 _::

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IDBh'rIFICATION violation of the Tcchnical Specifientions, pnIngraph 2.3.7, OF OCCUT@U:CE:  !

lhin Stcan Line Lc'e Pressuro Switch RE23A was found to trip l

bt a pressure less that the nininun rquired valuo of S60

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psig. ,'

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Wie event is considered to be nn abnorral occurrence es de-fined in the Technical Spacifications, pm:ntoph 1.15A.

CONDITIO"S PRIOR x Stendy State Pouct Routine Shut 6 3 TO OCCUIiENCE: Hot Standi)y Operatica

,_ _,, Cold Ututde,wn ~ Lond Chungas During nefueling Shutdoun Routina Power Opcri: tion Routino Startup Other _(Sp::cify)

Operntien Power: Roactor, 993 init Electric, 30015lo Flow; itecirc. , 20.2 X 105 lb/hr Feod. , 3.4 X 100 _l'u/br Rouctor Prest tut . 102D psig Stack Gas: 9,850 UCi/ scc

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DESCRIPTION OF On Friday, Septer!bar 27,1974, at 1325, uMio perfoming a CCCUIGfriCE:

routino surveillance test on the four l'ain $tenn Lina Im Prossuro Switcher., it ua . discovered that switch RE23A tripped nt 855 psig. 'Als value is below the P.inicsin rcquired trip point of E60 pr.l.q i.hich is derived by addigP. to tno meanica)

,.Spucifiention lir..it of.850 psig a 10 psi;: he.td correction

o O-s Abnorral Occu Icnce Report !!a. 50-219/'14/4L; Page 2 8

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The "an foted"'and "as Icft" switch sottingr. were:

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_"As Tc.und" Gottint-. "Ar. T.cft" St EtihQ RE23A 855 psig 860 psig RU23;l 860 psig 860 psig g RE23C ESO psig 860 psig -

nE23D 060 psig 660 psig APPARENT CAUSE Design PYO?cduit OF OCCUN.EliCIi:  !!anufacture Unusual Scryico Condition Instc11ation/ Inc. Er;vh:crental Construction Corponent l'ailuro Operator i Other (S p cify)-

l 'nte csube of this occurrence is switch rc;;et? bit!ty, which is a recognized pmble,,,

NiA1.YSIS OF As indicated in the 13 aces of the Technical Specifications, OCCU:UUr.:CE:

"The lou pressure isolation of the l'ain Stena Idnos at 650

'psig u!.s provided to give protectica agiinst fact ccacier

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. . deprennurization end the resultant rapid couldchn of tite <

vesse). Advantago uns - taken of.-tin:,cerau feature uhich . ,

occurs phon the Hain Stcs;a Isointion Valv$s are clescd to provido for rcactor shot? curs ic 'that high pcuer oper.aMon at 109 rec.ctor pressuic does not occur, thus providing pmtec-tion for the fuel cladding integrity safoty linit.

The adverse conncquences of reactor isolation occuri-li:g et rer.ctor proscura nppsu.luately 5 ;psig hIci the r,pecified -

._...pinipua voluo.of 860 psig is linited to tinIso cifciti. atten-m (Ifmt. to 4_cycator than norr 11 reactom-91dcha rate, ___'lhe

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Previcto /hnorml:Occurreaco Reportr, iiwolvini those switchos are: '

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1. . l.ntter to Mr. A. Crrmw.o -Emu Pe. D,. A. Ross, dated J S t

Dacorfaar 24, 1973.

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2, . ~ Abitanni Gecurrence Ecpert 16.' 74-16.

3.'. 1.bnor l Occurrcaco tir,nort 170.' . 7GD.

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4. Abnorul'Occurrento bcport Ibi 74-10, l5. . Abnorr;al' Occunen o r:. art.!!o. 76 12.

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6. Abnomal:Ocenrrtuce Dqort I?o 74e22. . .

7 Abnorr:nl: Occum:.;c Rcp3rt !!o. 74-33. .

8. . t.bn:,7,nl: Oacurrence Ecpon 14,.74+37.',

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