ML20090E173

AO 74-9:on 740628,during Restart,Reactor Protection Sys Relay RE-230 Failed.Caused by Open Relay Coil.Relay Replaced

ML20090E173
Person / Time
Site:	Nine Mile Point
Issue date:	07/01/1974
From:	NIAGARA MOHAWK POWER CORP.
To:
References
AO-74-9, NUDOCS 8303140015
Download: ML20090E173 (2)

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.h Jure 73; 1974 -

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3. ll Mine U.ile Point !!ait .1

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4. Id m iH c dien nf Orce.r.rc.. i e

failu.a of fiU229 rd ey (125) to rcipen 10 n n.i (untrip;ed) ,

- 5. .-Cen littens Prier to Onc0rrence

-tir,it c:.: baint rastert d fn11:r. ting S; .-in ; ten' ding Dutcge.

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Ducin'; the int-up 5:3. of urit rc:Xrtrith reccLar prc;sure incrcuito c.; picanW device il ?N R.'.1< ,i to reset ti; CC9 pig. The relty ecs re- 1 p1 6. J,. .: 0. 6. . . a ,

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g Inves tigh, .um rev.h.co.  :.a open rew.y coil .

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Prescurs in:trm :mtr. tion ,(ht.-23) trip. uhen the rnin ster line . .. . . . .s.pressure .-

res t,res or cecands b.,e" on.3 psig, a n,9 ,crip ,inncacu u uti s t2c,l in w., e

iW.'i" r.cdr ps;i; ion eni !. Pri 3rily this function is prtvid6d to protect I '

cpimt s r.rcs ure r :g:lt.tcr t'/:IG wt Hm er inin si.sn line. brec.h 36ich would caen a ccoli f loss, either thre the brok or the-turbine bvpe,s 1

valve system frca the reahtur'versel. With ths ' trip set et CE0:;5ig coolcnt'

! Icss it lic.ited to the the fuci is n;t vuovcrr ' r.nd par': clai tcr nrat0res i Arc - lit. tiled. The systo .legic 'is a one cut of tuo, -tuict: r.auiring one tiip ca etch 60 the trip systan 10 i.ctor.Le thn recuircd function. With i

the rclay f ailure, =(In l'u P.D5 all r: hying .is Gesigned Fsil-Sde i.e.

fnil to tha s6fega;rd condi ioa) une of th:: tic . trip 4vstr.as ut.s trir. Ped.

' ~-In this instruantatien sy;i.cra u.r:r; tan trip sv.<ti:is arc resuired ' ' to .

-initieth c ticn, ht.ving o.ie iriv sv'.f'i aircddy tripp:d does tiat~ etranse. d -[

thh relirbility in ters.' ef initiati::g the Lricsir;d de ;iensi.cction. Thord. -l- *'

fore, uith thi raisy Csiihre, de cycc w cscem d Occ tr.V;mE kv..s) iia &&--

designad. Oned upon thf chave_ logie ::nd actions, zit is ccr.:ludcd that:

at .no tir:0 nauld a knzerd he present.cd to the1 general public as al result of this failure.

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Ab'umnal Occurrence P<!r. ort ,)uly 1, 1974 I

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-l 1 . t i The reltv was re.nicced inudictely to cuatile t'm scasur to scrf;;rn its . I-inta*d functicn, -

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