ML20090E173
| 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 7
se 3.
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ll Mine U.ile Point !!ait.1 I
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Id m iH c dien nf Orce.r.rc..
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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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.P.'2' e r'. ~% n _'">. # -' " - ' o-xx Ducin'; the int-up 5:
of urit rc:Xrtrith reccLar prc;sure incrcuito 3.
c.; picanW device il ?N R.'.1<,i to reset ti; CC9 pig.
The relty ecs re-1
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.Dn._n i e r. t i c, o.f. /m.o.,r: n.t C_r.c a__.n ;'._th., e._.O_r.c,e r rc E._a.
g um rev.h.co. :.a open rew.y coil.
Inves tigh,.
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Imt l y s i s_. o.f__O c_cu rre c.e.
Prescurs in:trm :mtr. tion,(ht.-23) trip. uhen the rnin ster line pressure res t,res or cecands b.,e" on.3 psig, a n,9,crip,inncacu u uti s t2c,l in w., e
.s.
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 valve system frca the reahtur'versel. With ths ' trip set et CE0:;5ig coolcnt' 1
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.
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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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i The reltv was re.nicced inudictely to cuatile t'm scasur to scrf;;rn its I-l inta*d functicn, i
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