ML20024C553
| ML20024C553 | |
| Person / Time | |
|---|---|
| Site: | Crane, Davis Besse  |
| Issue date: | 11/14/1977 |
| From: | Murray T TOLEDO EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML20024C554 | List: |
| References | |
| TASK-01, TASK-03, TASK-05, TASK-06, TASK-07, TASK-1, TASK-3, TASK-5, TASK-6, TASK-7, TASK-GB GPU-2006, NUDOCS 8307120798 | |
| Download: ML20024C553 (58) | |
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Supplement :s lapo:.a'ala Cc=u::anca 37-32-77-16 Davis-Bassa Vuelas: 7ever Sta:1:n C=1: 1 Data of Oc:ur eseet 3ase=ber 24, 1977 I: closed f1=d :hrse copias of I.icansas I;u== Esper: NP-32-77-16 Supplanast, whi=h is hains subsi::ad is ac== dasca vi:h T -W-
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sW tA.KT on Sep:a=he: 2 f., 1977, a serias of eve =:s oc:== ad a: da ravis-iassa n1= 1 eich resul:ad is dep;assu=1=a:i=u.of da pe-- y s7sta= f.== a
- nor=al opera:i=g prassura of 2120 psi :s 900 pst i= app:= '=a:aly 8
_.'.=utas, a=d de :alassa of app.. '-=:aly 11,0C0 sall==* of wata: 1=
the for= of staa= vd din de ess-----: d:= ugh :he prassur1=ar I
quanch ta=k vpc=== disc.
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- Qu the afta==oca of Sa=urday. Septa =hei-24, 1977,,tha =ais turhisa was shus down to repair a laak is a y;assura sens1=g cen=ac '.su on a s: sam line f;ma the turhisa geva:=ing valves to the ta=hi=a isle =. The re-ac::: vas bei=g held c=1:1=al at app ~_d_=ataly 9: de==al power.
.1, Am 2134 Scurs, a spurious hal! =1; oc===ad i= da 3:azz yendvatar Empeurs Cos=si Sys.am (571C3). "'- caused da sta===n fandvatar valva on the No. I staan sansra:o (which is the nor=al fand path at this power laval) to class.
Closu== of this valva rasul:ad is a 1:e No. 2 staan sens sta laval, which than resul:ad is a nor=al full =1; of the 371CS for cia esadi:1ou and ' d-d= tion of the 571C3. 371 3
- '-'=tica closas both sais staan isolacima valves and 'n'-'s:ss fand-wata= flow to both s=aan sana:an=s from their i=d1ridual staazA-1 van
-- = y fandpumps.
T na half ::1p and resuI. _d=g full =1; of the 3713 car. sad"a radu= 1cn is haac removal f;en the p;'---y systa= a=d a en :;sspond'=3 ca= para =a/
pressure taa is the p:1=ary systaa. De pressura rise is da prs'y sys.as caused the p;assuri=a power ralief valva := lif:. nis valva EE than rapidly escillated closed-co-opes appenz1=ataly sins
'=as and runa1=ad is the full open past:1as.
2a tampara=== rise is ha p;'== y sys:an caused as-ind=assa 1: the
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pressu=1=ar larel, and the operats: =a=ually =1 ped me rasc:== on 7
high prassu=1=a level app;sz1=a:aly =vo d.= seas af tar the h'a1.2 =1; as the 372C3 occur:=d.
The pressu 1=== power :a11af valva, "s tha' full open pos1=t=s, rapidly i
reduced the 7:1=a=y systas pressura, a=d a Safa:7 Taa ::ss Ac:i.a.1=s Sys.as (STAS) trip oc===ad at :he 1500 psi se: pot== of.he ;;'-- y systas. Sa power reliaf valva discharga g=es== ce prassu=1===
quench tank, which beca=a overloaded and ove:prassu=1=ad, and any :v'-=:aly IJs d=utas afta: =aacts: ::1p ha==p:=a disc in this a=k raliaved due to overprassura, ve= 1=g da stama i=ta the cou-='----. 4.u :.=.a a17 20 minutas af:a :ssets: ::ty, -ha operats:s diag =esad tha rassen is:
the 7:1=a=7 systas deprassurt=a:1am as bei=g.he power relief valva, and 2:sa the con =si : sos closed the assari=ad block valva ahead of the pova: ralia.f valva, ta==inating the laas of primary coolant into the conta1= mans.
Subsequent operatar ac dma us1=g -
pu=ps and high pressura injec ds=
pumps s.ah111=ad the pri=a=7 s7 stas prassura and prassu:1:a lave 2, and r.
cons =olled shutdsva =a esid shutdsva asud1=ians fallsved.
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- 'he =ajor physical da= age f== the i=cida== vas :s the ra'Ise:iva =eesi i
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issulati=n c= the 1=ver par. of tha No. 2 staa= gn= ara:st, which :a-caived de je: of :::an es=1=g f::= the prassurima: qua=ch ta=i.
A vas d'"'
g du== 1= da arma of the que=ch ta=k was d'--lad a=d requizad s::aight- ' 3 2.rs=:7-:hree pamals of reflective =e:a1 i=sula:i=
requ1zid replac=====.
I:7 is== the e==--~~== vas =ada a: 0530 Su= day.,
l Septa =he 15, 1.977, !== clea=.;p opera:1cus.
Another eve== oc::: ed is de course of ^'- iscida== tha: did so:
con :dhuta mataria117 ta da above ave==s, but did rasul: is da No. 2 steam generator goiss dry. 21s was the failues of the No. 2 -- d'd = y
- feedpu=p to came up :s full speed following the Sn=3 ::1. 21s 7
f M,,-ir, came up to approximataly 2600 rpm a=d s ayed a: "d-level wi:h no flow ta the staan generata un d1 app:- '---:aiy 12 _d=utas aftad raactor : rip, when the operstars placed its con: 31 1= =a==al and brough 1: up :s full speed (essmanc1=g feedvata= flav :n the staan gens: star).
na depressuri=ation of the pri=a.y systan resultad in staan fe==a:1en in the prima.7 system, bu svaluation has shown da a was no appreciabla boiling in the cars. De pressura/temperatura ::anstants is the pe'--=_ y systas ensponsnes including the seamm genera:mr, reactor coola== pt=:ps and fuel vers severs, be: analysis and subsequent pump :ss d=g has shown that thess aients a=a wi^da the design allsvablas and tha:f*
na da :1 men.a1 affacts ara :s be e=pec:ad on the pr'-- y sys.an, pumps or fuel.
Systss/c==ponen: =alopera:Lon or failure ce=== ed in thras armas: SU.c3 (half-::19 *-'-' *: dan), pressu=1=== power raliaf valva (oscilla= ism and
- =d=3 in the open positima), and ="'d-y feedpu=p- (failura to essa up :s full speed). Sa causas of thasa malapera 'ca/failuras have been i=vestigated and cer ::=1ve an=1:n takan :s p;sven: ra
- d--I s7sta=/equipmen: modifica:imas have been' comp' lated or init ated, and addi:1ceal : 31 ming has been isi.'_atad to s: ent hen d
the systans i= allign=ca availabla :s :he opera::: a=d daad:a:a operstar ac.d.on.
l A no.d=a d=rist the sequanca of events was thera a=7 jeopardy :s :he
.. health and safery of the publis or plant opera:::s, and :Aere was no ralassa of radica: 1rity :n the envi =nnent.
Ac d.vi:7 lavals vi-5d-the conn'--=a a: so 1ma i=peded -- - '---: ac= ass.
All safa 7 systans parfa =ed thet:
132 !=ne-J sus is the p =per i
sanzar. Opera:me ac.'on was :imely and,.wer th sushou: :he sequenca I
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N A= the.1=a dis i=cident oc=ur: d, the ::ac:1=ater data leg-i=g systan was 1= sarrica which rac::ded at high spend a =u=her of systas para =e:s:s tha: vould as: h, ave bes: availabla en such a.1=a base th: ugh nar..a1 sta:ica i=st =a==a:1mu a=d raes:ds.." sis is-for=ation :sse d ar vi d he ec=pu:a ala== 1:331:g. has pe==1::ad a very detailad plat:1=g of tha ::ansias: condi.icus is, da p:d-= 7 and seconda=y systa=s kayed to the systan, c==peces: and oparz s actions. 21s data is plattad on four 71 gens i= Exhihi 3.
71gura 1 is an 11-misuta plot of pri=ary systan paranstars f ss one (1) d=ute pric :s event d *-d = d.cn (571:3 half trip).
71gura 2.h.s a 130-m1=u a plot of th:se pri=ary system parama:ars.
Figuras 3 a=d 4 ara 95-cisura plocs of pressca a=d ce=pera:urs for staan:gn=arats:s No. 1 and No. 2 sspectively.
.3 a event star.ad at time 21:34:20 (T = 0) on Septa =he: 24, 1977.
De plant was in )fode 1 vish 7 aver Q.GT) = 253. The turbi== had been shutdown as lier is the aveci=g to repal: a laak in the mais staan lisa at an inst== ment :sanection be: ween the turbdsa s =p valves and' the high pressura turbina. As this ti== a half c=1; of the 3:aan and l
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Teodwater Ruyture Cent:n1 System (IT1c3) was 4-3-d = tad by an unkmova cause. Sa ::17 closed de sta===p feedvara valve en No. 2 staa=
ganaratar and st=pped all feedvatar to this generacar (as "d-Icw l
power level tha -.ais faadvatar bisek valve is closed, isola.1=g the
=ais faedvata= castro 1 valve). La low level ala=n was reached is No. 2 steam ;;amaracar at T - 24 sec. 3efore.he operass could identify and es: Tact da p;nblas, this lov lavel is No. 2 stazz gamerata= correctly produced a full t:1p of the 371:3. S1s ::17 clesad tha -
d-senas isolation valves and feedva:a: isolation valves is bod staan generators (T = $8 sec.). STR:3 isi d.ation also star:ed both a~did = y feedvatar pu=ps.
na number one pu=p perfor=ad as i= s=ded, however,==='oer =vo a~d * * *-y -feedva:er pu=p culy cz=a up s 2500 ryu, i=suffi:Lan: :s feed its staan gn= ara:n (No. 2) l De loss 'of feedvatar, fi:st as cum a=d then both staa= gn= ara:::s, caused an i=c:aase is razc=== coolas: ta=peratura, vt ich :ssul:ad is l
an i=crasse is pressuriza: laval and raze::: escla=: rysta= pressura.
At 2133 752: the pressurizar elac::= a:1c 311af valve :acalved as i
open signal.
Du=1=g de sem: 40 sacands, 1: racaived open and close signals, cyclad c1=se-em-open ima.d=as a=d.hes ranaised ope
- d-provided a ecutisuous vent path f:=n the prassu=1:a to the que=ch ank. %en pressu=1=ar laval :sse to 190", the aparator =anually
- 1pped.he ranczar (T = 1 min. 47 sec.). Energy escap.=3 th sush.
d the ales...
- 1m :alief valve and main stamm relief valves caused a rapid enoldown and depressurizatias of the reacts: coolant sys:ss.
2asata= coolant systaa pressure dropped ta 1600 751 (; = 1
-d 31 sec.) initiating da safety Teaturas Actuanian System (ITAS).
S ia started the high p sssuza fajection pumps and closed cartain coneM i==at isolation valves.
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irith the elec:::=a:1= ralief valve se'11 opan, the gus=ch ta=k 0
- uptura dise :=ptured (T = 6 nis.), relieving stasm ists the coC*2#"""* 3*.
ilhas the sse: : coola== systa=.prassura decayed s appF-=:aly 1300 psig full high p;sssura inje :i=n f1=w was es ablished a=d I
startad ta raise pressurisa level. At T = 6 zis. 14 sec. the overstar s:spped the high pressura i=jec:Lon pu=ps.
(D a'operats:s had been heavily involved before this 'd.ma in res="~d g seal injec-tion flow to the rese:ar coolaar yt=ps which had been s:spped by the 37As actuatics. 37 T = 5 nin. 20 sen. the app;spriata STAS signals had been overridden and nor=al flows :sstorad to the saals of de pss=p s)'*. Rese:ar coolast system prassure c=utinued :s decrease until saturabian prassura was Tsached a=d steam began to f3:= i= tha ranc sr i
coolant sy :en (approx 1=ataly T = 8 31=).
This caused as i= surge of watar ists the pressurizar and the pressurizar lavel ve== off scala at 3:3 inches. During this level inc sasa the operator, seeing average reac ar coolant system ta=pera:ure and prsssurima: level incrassing, stopped esa reactor coolan: pis=p in 'aach loop (T = 9 mis.)
as reduce the hast input into tha :saster coolans sys:ss.
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Due to decenasing p;ssan=nin No. 2 staan generstar, the STICS systez i.
gave a 1sw pressure block pe==1: sis =al at ! = la mis.13 sec. His i
I alertad c e operator :n the lov level and feed emndition of No. 2 I
staas se=arator. Is blockad the law pesssurs==ip (T = 13 mis.
13 sec.), took =anual cons a1 of the speed of No. 2 ausiliary f and-water piang, which cc=mancad full f andvata= flow a No. 2 staan genarster (T = 16 min.).
De operator saw the rapid addi:1sn of cold feedwater into No. 2 staam generator was dr=ppiss tha raaetor coolan: system tamperatura and reduced the feedwata: addi:1on :s this generator.
At apprezi=ataly T = 21 mis., 1: vas da:a==1=ad ha: da p=ver aliaf valve was :.- * 'as open and the block valve was closed, i.sciating the power ral'ai valve on ce pressurizar and s:spyi=g the ven:1=s of the sactor emolant systen es the quas.ch M-At T = 31 =1s.,
p;sssuri=ar level came back on scale. A: T = 41 mis the opera:s; started a seennd sakavy pt=p :s : 7 and s:sy the prassurisa level dec aase. "is additional es.'.d vatar startad de rasesor coola==
system on a slow decreasi=3 tamperatura ::a=sian:. A ! = 43 d.s.,
prassuri ar level raschad the low level interlock and cu: off the pressurizar heatars. At ; = 49 =in. the operats started a high pressura injection pts'y
- .8 ::7 and s sp the dac=samiss prassuri=ar level.
Me level and pressues in No. 2 steam generatar agais decrassed to the point where the 371C3 gave a law pressura block per=1: sig=al.
De overstar again blockad the af.y and, through senual speed con =ol of its a~d ' d =7 feedwatar pump, rastared lavel and pressure is No. 2 staan generatar (T = 31 mis.)
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ylth pressurize level well as hs way en acave:1=3, the opera:sc V
s:spped the high pressure i= jet.'.:n pu=p (T = $3 i=. 24 sec.). At
- = 57 =is. he rast
- red :sse:=r coola=
akau; thw =c so: a1. nis stopped the siev dec:aas1=g ::accor coolant ta_paratu:e transie==
which s:arted a T = I.1 =i=. All* plant para =a:ars vera scv fully under constal and the plan vas brouth: :s a steady stata es=di:1c=,
and a ser=al plant cooldown s.arted.
3.
STS ZM=Iw.rIa, MAtyt"NCT'.CN A.
cenehl 2arh vara three systa=s/c=uponen:s whers =alspe'ra:Los or fa114:s oc=urred durins, ths avant. nase ara:
1.
Stasa Teodwater Euptura Control Systas - STICS (half-crip initiation) 2.
Power Relief Taiva (os"=% and failing in the spea peastica) 3.
A d'47 Tendpump (failure to come up :s f=11 speed)
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De 571C3 is a saf ary systas desig=ad :n provide feedvatar :s the steam generator /s for removal of decay haat fers de pri=ary fi systas andar a variacy of hypecesi=ad plant opera:1=g c=ndi:1ons.
Dasa hypodesized condi.d.com incinde loss of normal feedvatar flow, staan line breaks and feedvetar line brasis. 2 e asspo-seats of this sys:aa include sensing sysseas, logi":3and d d -' * %
systans, main staan 1selastou valvas, staan :=rbise-d=1ves a ~d'd = y feedvatar pumps, feedvacar isolation valves, ada:7 sesas and feedvacar supply valves and cross c==nec: valves. A description of this sys:e= is con =aised is ?*
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A hal.f trip of de STRCS i=itiated this aves: by c1=s'.=g.he s.artup faedvatar valve to the No. 2 steam generator, whie.h resul:ad is a full trip due to low staan generator level. nis spurious or i=adversant half trip, and possible :aasons for 1:
oasurring, are dis =ussed in sera da: ail below.
k'ha pressurizar power relief valve is a 14" pilot-actuated reliaf valve connected to the top of the pressuri=ar with a accorgerated isolation or block valve located in the 11=a i=nediately ahead of the raliaf valve. La purpose of dis power relief valve is as prsvidd,a saans of relievi=g pressu==
isar pressure without requizias eyera Los of the spring-loaded ASME Cada relief valves.
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- uring this event, the power-eparated relisi valve opened, oscilla:ad closed-to-open a=d then failed :s close and renaised is'the spes position. Cpara:ce actics frra the i
control reos closed the isolation valve ahasd of the power relief valve about 20
'=uses af tar raaetor trip.
De raasons for the osa*"ati=us and the failure of Ehe power reliaf valve to close are discussed in sera da: ail below.
La steen turbi=e-drives a""*7 feedvatar.pu=ps are a part of the $7EC3. tTpon initiation of the STICS, the anu111ary staan supply valve to the faadwater pu=p turbine opened as callad for. De No. 2 auxiliary f eedvatar pump turbi=a came up'as 25CO :/a and rs=ained at this speed rather than c=n-tis,ui=g up to 36CC rys, which is the design speed. Operator act4en at it. misuces after raaetor trip brought this pu=p up to design speed by placing the control (in the conc =si room) in manual. Failure of this pump to come up to speed did not nazarially contribute to this event, but did result in the No. 2 stama gesarator bo"dag dry, which added to the transies:
essdition la the primary systas.
3e reasons for this feedvatar ytzrp turhisa es come up ta speed are discussed in detail below.
3.
57KC3 i n.
De ini:iating event was a Steam and Teodwater Rupture Control System (573CS) Channel 2 momentary one-half crip from an unknown cause that want back ta nor=al before the statica crepu:ar could record he saurts. 21s one h =' ' trip caused the following eventa:
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1.
De startup !esdvater eentrol valve (5771) on eaas ganarster No. 1 c1csed. Bis caused a loss of feedvatar
- ~d d-at on staan gesarator No. 2.
2.
1 one-half trip on Channel 1 saaled is on both sais steam lisa isolation valves (E5:7). n is on'a-half trip desmarziand at laas: one solenoid valve sa each M5:7, and rasulted in a "Ma Scz Ise 1 (2) Trh1" alars on the station computar for both 23 7's.
Mis meneatary one-half trip could have been caused by l
a spurious contact opening or a loose connection in a wire in a $73C3 input signal from a steam generster low pressure svizah, a steam gaserator low level hissable er a main feedvatar high pressure diffarantial switch. La assentary one-half trip esuld also have been caused by trouble internal to the 371C3 cabinets. All possibla
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cansas vers investigated. As a resul: ef this inves:1gation, it was Jeta-Nd that an input buffer' card had failed. '
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Transie tes During this rapid dep;ssau;1:ation eve== (see see:1on 2 above and Exhibit 3, 71guras 7-1 th:sugh 7-4), the rase:or c=clas: systa=
pressura d:=pped f:=s abou: 23C0 psig to about 930 psig is 7% nisu ss and gradually recovered to 18CO psit in :vo hours (see 71gure 4-1).
During this 7h 31=ucas the reae:s coolant outlet temperatura dropped at va.ying rates f su about 380 F to about 323 T.
App;mzi=a:ely 30 mi=utas af:a this 1si.'al taspuature changa, a second slave and smallar ta=pera:ure change f: = 340 7 ca 3C3 T oce-.Ted over a 21 -1. uta period.
Toflowing this second ca=peratura decressa, de tarporart:e gridually ise:aased over a 2-hour period s 3:1 7.
Sa :aac or coelant islet ta=peratura changes and durations uare s4 diar :s those of the reactor coolast outist camperatura (see Tigura 4-2).
na secondary side pressure in staan generats: No.1 reached 'a
d
of 1c30 psig and dec:aased cm abou: 860 psig vi ^*-
13 minutas (see Tigura 4-3).
La secondary side pressura is steam generator No. 2 asched a maximum of 980 psig, decrassed to 610 psig is 14 minutes, and ratarmed to 860 psig in 2 minutes.
Sten:7 aisucas later da prassu:s is steam gemara:s; Yo, 2 agais decreased to 610 psig and shadually racsvered over a 2-hour l
period (see Tig= a 4-4).
?:: =
1.
glests of the Resets? C.,olan: System 347 has completed its evaluation of the Septamber 24 transients
- and has found no harmful shor. or Icug-carz eff' acts ou de reac:ar coolant systas components. For this evaluation 1: vas c=userva-tively assumed that ce :stal ta=pera:ura dae:aase oc=urred at the initial :sta. Sis results is a 498 T decrease in the*:sse.s; coolant outlet tempera:::a over a 6-sisu:a period.
De design specifica:i=a f:: Davis-3 esse Uni: 1 quired de evalua:Los of 40 cycles of a rapid das:sssurizati:n even:, which included a dec :ase is ce reac:sr coolant p;sasure f:ve 2*40 psig
- s 3C0 psig, a change in' the rase:or coolan: systan averata temperatura fr:a 363 F :s 300 T, is 13. =1=utas, and a dec:sase in sacandary system p;assu:a from 1CfC psis.s 640 psig.
ne major diffaranca between ce ac::a1 :::=siast and the design
- sastent is the rate of tha tempera:ura changs is the sas:ar coolant system. Se actual rata of te=peratura cha=ga was twica the rata of the design ::ansient, but the estal temperatura change was only 73 of that of the design ::ansient. L a :st rasult is dat the fatigua usags of this.one rapid depressuri:2:1on is about the same as that predicted ist one cycle of ce design ::assient.
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Auxilia-v Tec h u=3 Turbine Covenev De auxiliary feedpt.p No. 2 failed to ac: ele:::e to the no;=al speed of 3500 ry=.
S e see.sa 1.sola:1on valve ope =ed properly and the pt p ease un to a.bcut 15C0 r;=.
La gove=c:,
a Woodward Type pc-p1 vi:S a* speed changer =c::: ' driv 1=g the na=ual speed settiss k=ch, va.: ""* ! for a highar speed (de speed change: motor was i.. isg is de "i= crease".direc-tica). As requi:ed, the gove=c vas left is ac:orda=ce vid procadures with the speed adjustment at the "f*211 spaed" positten when de pu=rp was shutdeva. Toen the pt.=p was callad i
on,to aut:-start, vi h steam gescrater level belev sa:poist, the speed cha=ger motor conci=ued to drive, th = ugh a slip c1'
=h, is the "iserease" directics. Invever, the speed u
set.1=g mechanism was already as i:s mechanical high speed st=p applying a bt-d'*g torque s the T bar, a portion of the " feed back" 11=kage, not allowing 1: to drop devn and allsv the pi. sten red to move down in the i=crea.se speed direction. De undesired bisdi=g in the feedback li=kage gave the goverse; a false sis =al that tha turhise was at de desirad speed. Once the torque vae removed, by operator remote manual actica, f:ca the "T" bar, de "T" har dropped down and T
the auxiliary feed pGap curbina precaeded to the high speed stop ( 36C0 rya).
D.
?ressu-izer Fever 1telief valve Wen the rescus: coolast systes pressure raschad the sa:pois:
for the pove: relief valve,1133 psig, de valve opened properly. Eevever, thers ~is a saal-Ln ra147 which then kaaps de valve open until pressuru is reduced to a icvar " reset" pressura (1105 psig). nis seal-is ralay ca c=n :sts the clos 1=g of the valve was issist f:=a the circuit. Ui.hout tha relay, the valve reclosed as soon as pressure decreased belev the "open" seepoist. ne resul vas ope =-cicsa cycles as pressure vent above a=d belev the " opes" sa:po1== prassu:s instaad of one or two innge: blevs es relieve de high prassura devs :s the "rese " p;essuru.
After a:p;;x1=ately nine open-closa cyclas tha power :a11a4 valve remained is the opes posi.d.:n.
Een tha valve was dis-assembled i: was found that the pilot valve was stuck is de open positten esusing the ais valve to s sy ope =. n e pile:
valve was stuck is the open posi: ion dna to unk=cun foreign
=aterial b'-d' g the stem i= the guida arma of the pilos valve nozzle.
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o As a more direct c== paris :, the ::a sies: eve== ide=:ified was 0
analyzed far the ::ac:ce vessel shall and c==parad :s the desig:
transtant. n e :ssul:s were tha:.he ra=gs in ther..a1 radial gradia== s::ssa fs: the ac:.t.a1 ::assis== vas it.CQ psi, a=d the range of ther=al :sdial gradie== s::sss f== the dasig: ::a.sian:
vas 6600 psi. Sis c =pirisen vould be reprase=;a:1ve of c:har cicknesses.hroughout the reac:s; caolant sys:an prassure boundary.
Da gonclusions of the analysis are (1) Strasses in the pressura bounda.y 'did not ex=ned those i
already calcula ad on a design basis. nis is verified by the actual pressure not exenedi=g 13C0 psig and the themal transient being less severs can a c==hi=a:i=n of
{
design ::ansiasts for a rapid dagrassuri=a:1on and a raastar trip.
(2) Fatigue life of tha reac:or coolant composan=s is not affec:ed if one cycle of the reactor ::17 design c:a=sian:
and two cyclas of a rapid depressuri=atica design tra=aiant are considered to be used for this t sariant. Tvc cyclas of the rapid depressurizacion transient ars =eesssa.y be-cause the IFI systan was actuated twica duri=g ha sven:
and =ve cycles are secassary to reflee. :he da==al ::a=aia==
in the high prassura injection so==la.
De effect of the entire event on the fatigua life of the
=
staan genarators can be accountad fs: by using one cycia of 1
the design transient for rapid depressuri=ati.n and one cycia of tha design tranzians for loss of faedvata=.to one genera:me.
(3) S e effect of the chassa is vata level on :he pressurima has a very sisor effect on tha pressuri=ar shel'. s' : asses.
n a prassuriser has been previously analyzed fs: ths shar=al effs.c of va:ar-staan istarfaca, and the change of level does not affae: that analysis.
(4) No significant thor =al shock should oc=ur to the hea ars, because the ham:ers vers daac-1va:ad due to a low vaca level sensor and not rass:1;stad u=:11 de lavel rac=vered.
(3) Na dynamis effee.s were caused by.he rapid pressura decrease.
No spesific analysis was dona. but a dyna =1c response of the shells would esquira a large pressure chansa is.ha ords: of milliseconds, and the as=ual changa was on the scala of misu:as.
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n a reduced fsedvater f1=v :s staa= :;ssers::: No. I was so:
sufficies: :s af=:ais a vata: level duri=g the firs: five minutes of the even: and this steam gn= ara::: boiled dry. Se prt=ary c=searn vi:h a dry ge= ara m 1.s da tuba :n shall ta=-
pera:ura diffarasca. Is this avan: a va e: level was asah11shed before the sys:en ecold vs. was s 2::ad, a=d accep:abla : he :s shall =c=perature diffe:cuces were =ai= a1=ed.
n is c=ndi.1=n is sd =r to the 1cas of feedva:ar design tra=sians, followed
.by :sstart of a dry pressur1=ad gn=arator usi=g the aa-da.y feedvatar system.
De burs :sp:ure disc on de pressurizar giten=h tank rasulted is a st:aan of staan and va:ar impinging en staan ge= ara:m No. 2.
n.s stream removed a secti== of i=sula:1:n 10' high and 20' vida froit de lower shall of de ganarats; and i=pbged direc:17 'on the<3enera==r shell. L a tamperature of the i=pi=ging water was assesad :s ha 2128 T.
A conservativa evalua:1on of the :1914 temperatura change in this local ragion of the vessel shall was perfo sed. na results of this evalua:1cs indicata that ^' ana event used less than 12 of the total fa:1gue life of the vessel.
ne predicted fatigue usage factor far the 40-year design life of j
tha vessel in this area was less than 0.10.
n is jeg impissement did not significantly reduca the fa:igue life of the sesaa generstar7'
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na reac:or coolant pumps (7. 2) experienced the fallav1=g condi. ions during.he Septa =her 24 transient.
All four EC pumps vera subjected ts the fallowi=g:
4 0:00
~2aserar ::1p 1:10 STAS trip i
1:12
!aal re:urs valvas shn:,for 1:11..
l 1:13 Seal injection valves shut for 1:52 j
All four pu=ps epara:ed fer 1:13 with no seal injection and so seal :stu== flow duri=g he i
ECS de-pressuri=ation 2:28 Seal return valves open j
3:03 Saal i=jection valves open i
6:CD 3:asm for=a:1on 1
P:sssure ose'"z:1=g naa: ?sA-for 30 :s 45 minutas 36:07
'"otal seal injec. ion flev lov m1213 I
i Pump 1-1:
i 7:04 Pump tripped 7:45 shaft stopped 36:07 About one minuta of low seal injec.d.on flaw (near 2 sys) j, Flow imbalance sta: sed seal inject"cn i
36:30 Seal re==ra valve shut 1:12:33 Standpipe level high 1:17:07 Standpipe level nor=al l
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4:20 High vibra:1=n.
7 :Cl.
p=p ::1pped 36:07 1=s seal i=jec:1 = f=: abeu: cua _.d.==:a 36:21 Seal :::s== valva shu: fs: abeu: 40 sac==ds checkou: of the raac:m: coolant;=ps was i=1:izted :s. assess whhtha aintanases a=d/or rapai: was requirad as a :ssul: of tha Jans' ant.
Operati==al checks vara required :s de==us :a:a.ha: no sis =1.fi-eag: damass had oc===:ad :n the pu p baz:1=gs, shaf and seals.
De first serias of cas:s were ps:fo=ed i= Ecda. 5 dus em opera:1cual :ss::1ctions. R:a: opera:1c a1 checks vara perfe==ed is#3feda 3.
I.ach pt. p was s be apara:sd 1:dividuany for a dufazion no: to===aed een (10) dsutas, pesvid1=g a n defi=ad parametars renaised vi-'da asablished id d:s.
De opers 1cual sequesca was as fences:
i 1.
tif: pu=ps vera ses ad and pt=rp shafts :::stad by hand.
Torque values vara sa to exceed 2C0 f:-lbs. A s sthesespe was provided to detac: any u= usual =acha=ical noisas is sasi hous1=g area. (this was satisfac =rily c==pleted on 1C/3/77).
2.
Mode 5 =asting a 115 psis.
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2.1
!=s===nenta d.es laquired: '
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Uppa: a=d 1==ar cavi:7 p;sssuras - an four pu=ps.
l h.
3cch horizestal vihrs:1.u pr bes - a u four pu=ps.
c.
System pressura or sus:1cs pressura.
d.
74= ical p:che en 2-2 pu=p.
l a.
3:andpipe laakags was ecuac:ed a=d =sasured du:1:3 the tast.
2.2 Compu.e: Data -
Prin:mut N33 special su= mary ::and fs : -- d ! KC7 l
every 15 sec=nds.
2.3 De fonowing id d:s vers no: to ha az=neded:
a.
Shaft vihrz:1ss 15 mils peak to peak.
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s 21 standpipe leakage (upper seal laakage seal recurs sheuld so:is azenaded the pessibility es sed 0.o g;=.
If,'durius b.
To:
the tas this 11=1:
Is =c casa vill total saal asists of a= open seal.
If this 11=i:
laak.ags he alleved :s exened 1.5 gp=.
is exceeded, sai= ama=cs vill be ::quizad.befers further pump opera.1.W limits and precautiods prevail.
All other normal pla c.
- 2. 4 Sequence of Operation:
Securs s s=dpipe flush.
a.
Establish seal injection is ac=:rda=cs u.th plant d
T-b.
operating p;ccadura.
flow.
.iaasura and record sesadpipe laskage and resus Confi== that catal laakage li=1 s are not azcasdad.
c.
Assura communi ation between control com and personn stationed at RCP standpipe laakass d sis lisa.
4.
y Countdeva 1:33 10 to 0 e.
Start s :1p cha recorders a: high speed Star Easc: : Coolang Pu=p 2-2 is accaria=ca vi h 5E plaat opera:1=g procedure.
After apyruzisacaly 11 sec., ;sducs scrip chart speed.
Zum pump ime :ve (2) zi=:ss 'u= lass any above lizi:s f.
are escaeded.
Data assasszent by 3&*J and 3y;s:-Ja=kscu :sp=asen.a:1v 3
Tollowing assesszen: of da a. pu=p =ay be run for an aditti=nal five (3) minutas :s al*.ev for vs:.d:s h.
procedu:s requizaments.
/
1.'
Tollow above seguance ou 1-1,1-1 and 1-1.
Assessment of this dans will decarv.se wh j.
is allowed.
Similar sses wars speated with systes pressurs at g;sacar h
di:1on than 1300 psig befors a final de:a:Wsation on t e emn 3.
of the pumpa was r.ade.,
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All four ::ac:or coolas: pu=ps vers rm on 10/5/77 with :he following :ssul:s:
Rc? 2-2 10/5 /77 Run (2 =1=.):
Scaan p;sssure 225 psig 3rd Sez1 laakage 2sd Seal cavi:7 pressure 165 psig plus seal rar== !!av 4.4 gym 3rd Seal cavity pressure 123.9 psig Enriaan=al vibra:1on 5 - 7.5 mils Ter:1 cal vibration.25 mils After the 2-nisute run, the pt._y was ra for '10 m1=u:ss for
.iystem ven:ing. About 30 sacends before the ;u=p was shutdown.
thera was a stap inc: ase is vertical v1hration to 2.3
-d'
- Jha pump was em agais ca 10/6/77 for 10 =i==:as :s check ou:
this phasemason. The ver:1 cal vibra:1on was agais.25 mils until about 5 seconds before shutdevn, when it i=c;aased :s 2.5 mils. To allow a lenger em cima, 2-1 and 2-1 pumps vara run together for 10 minucas, than 2-1 was em al=na for 10 misuces. Tha ver.f. cal vibratica stayed at.25 dls for the entire rm. ?is was monitored during pu=p r=s durfng plant hast up.
It should be noted tha: the step inersass in vertical v1hra:1on was la:e assessed :s be spurious i=strmant noisa as a resul: of a icose cennec:or on an i=s::==en: lime.
After the connector was 21ghtened, vertical vibration rema1=ad less than.25 ils peak-ce-peak a=pli:uda.
2CP 2-1 Staan pressure 2 3 psig 3rd Seal laakass
~
< *4 #
2nd Seal cav1=y pressure 122 psig plus re 4 flow 3rd Seal cavity pressure 70 psts E==1: ental vibration 3 - 7.5 mils RC? 1-2 l
Sys:en pressr.ra 2*.3 psis 3rd Seal leakage l
2=d Seal cavi g pressu s 40.23 psig plus re:.u:n flav 4 **, IE" l
3rd Seal cavi:7 pressura 81.3 ;sig Horizontal vibracion 3 - 7.3 mils RCP 1-1 Systas prassure 223 psis 3rd'3eal laakaga 4 *4 2nd Saal cavity pressure 77.98 psig plus :::::= flow 3rd Seal cavi n pressure 39.27 psig Norize.ual vibration 5 - 7.5 mils sG e
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ne apparen: diserapancy en seal cavi:7 pressuras en 1-1 and 1-2 was checked en 10/6/77 by i=sca"4 3 pressure gaugas, a: the pressura ::a=s 1::ars.
he gauges read as follevs:
1-1:
8 i
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134 psis I
g 2=d Saal cavi:7 ?: assure 111 psig 3rd Saal Cay 1:7 7: essure.
1-2:
)
i 184 psig 1
l 2=d Saal cavity Pressure l
l 3rd Saal Cavity P:sssura a 112 psig i
t a
. Tha aadi=gs i= dica:a the saals are s agi=g p =parly, ir13ased on the above pe:fo=ance, 3&7 saw :o ec=ca = wisich would justify ma1=:a=a=ca a: the size.
3y 10/13/77 all four macts coola== pu=ps had been=== as a systas pressura gras:a: chan 1200 psig.
1C 7=mps 2-1 s=d 2-2 hava ess 1 sued :o== f:== the $=1:ial esid pump star a.
Salov is a typical lisa of data f:ca mach pump.
ICF 2-1 dm..
- E=:
system 7:assurs 1650 psig 2nd 'Saal cavity 7:assurs 1034 psig 3rd Saal cavity Pressure 300 psis Borisontal Vibration 3 mils.
s RCP 2-2 System"Pressurs 1650 psig 2=d Seal Cavi:7 7:sssura 1073 psig 3rd Seal cavi:7 ?: ass===
555 psig Soria=stal Vihra:1:n 3.3 mils RC? 1-1 1650 psig Staan 7:assurs 2=d Sasi cavi:7 ?:assura 1056 psig 3rd Saal Cavi:7 7:assura 340 psis 4 mila -
Morizontal Tihra:1an Ic7 1-2 1630 psig System F;essurn 2nd Seal cavi:7 P:sssure 920 psig 3rd Saal cavi 7 7:assura 320 psig Io 1zon=al 7thra: ion 3 mils
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f tha: all fen: pu=ps were 3ased on the above data, 3&W !al:
this in good operati=g condi:1=n and : equi:s nothist==rs a:
ti=a can periodi: =c=itaring.
21 checks a=d 3&W has :eviewed ce :ssults of :ha cpera:1c:no da:s(:able da=
has concluded ca:3&W considars the ::ac:=r emela== pu=ps :s be sarwicsshia for sus.ai=ed full opera:ier.a1 conditions pump composants.
with no requiremaats for maintenancs.
A mars da: ailed a=alysis was completed to r
Avent a Davis-Basse Uni: 1.
is (1) datar=ise if s:ssa was produced i=.hs for:s a=cseded hansians, and (3) data:nisa 1.f.aximum lif:
the limit.
71gurs 4-5 shows transient thermal conditions as =oni:ored na system pressure is =sas=ed at the f
pressure tag, which is approximacaly 63 fast abov the reactimetsr.
mately 30 psi higher than tha measured prsssu== because of the cars.
As shown is v'recavarshla a=d elevation p sssura losses..s=parat= a is siish:17 Tigure 4-6, the predictsd cars coolan:
higher than the da'~-m saturation ta=peratus (based uponmeasured h
and the predia:1on,
) could E
the sessuremen:
that some vapor bubbla fs==acios (staan bubblas is va: aran --- *-
havs occurred vi.his the cora. data (71gurs 6-7) indica:as during the saturation pressura for less than enn hour and thati of this tima partad the pressura oscilla:md.1.h a variat core could havs been subjected to buhbly f1=v w g 50 psi.
d :s vould be in the liquid as well as en es s=facs, as cypese hour.
21:h the ta=pa:a:=ss.
ma fo:matics from a het surfacs. duration, and type of for=atic ma ce cesposasta vould be predicted.
Prior to :he depressurization event tha :ssetor had been
'=nediataly operating at II: power for approziza:aly one vesi.
prior to :: actor ::1p the power level vaa 9% o During the gas penduction had ocarred and sons was :sleased.
60-einuta ti=a period is which the i=dicated IC
- 7==d so the averags coolant te=;rerature was isss :han 340 An i=1.dal strai-c haae 3suratian occurrsd is ca fuel.
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avaluz:1on had predic:ed :ansile s:Tessas is the cladding Q.
based.upo a =a=1==
pressu a dif f ara =:141 ac =ss the claddi=3 of 200 to 3C0 psi. "his evalua:ie: had haas based upon a 3CT. ".ATT analysis vi:h a= arbi::ary saf a:7 fae:::
l added :o ensura tha: ac:ual essdi:1=ns vould ha hcunded by
- he predic:1cs. A more. racan: a=alysis, agt.is _us1=g ".Ay!,
has resul:sd is a p;adic:ad -=^- i=:a: a1 fuel :=4 pressure of ICCO psia. nis analysis c==sidered as-built fuel p:=pa::iss and hot, naar taro pove; cahdicious a a coolant ava:aga camparature of $408 F.
On the basis of this analysis 1: is concluded that the fuel rod cladding was not subjec:ad to any' significan: level of tans 11a strass during -Ja subject i dep;assuri=a:1cn avest.
,* 3acausa.he claddi:3 was to: subjae:ad :n a larga, 1==g ta==
l
$ tensile s::ssa, no si3=ificas: 1==g ta:s affects ou the cladd1:3
' :ssul:ad. De ta=sile s::assas which could have oc=.:::ad would have 11:.la affec: on the cladding dua :s the s=all s:: ass laval and the sher: duration of the tassila s:: ass.
Asssasing a coolan tamparatu = of f37 7 and 130 I 106 n fmis system flav (pa; 71guras 4-3 and 4 9), ha sa: lidt forca vill be less than 373 lb. De m'-m*
allevable lif: for== is T
472 lb. Sarefore, va conclude that f a1 assembly lift-off did not oc=ur.
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The panel.s are for=ed :s the c====ur of the stes= ssnara:c:
a=d attached :s the ex.ario en a fra=a := su:per: the weight.
]
3ucklas and clips f as:an :he pa=als :=gether. ?anals blevn i
fras the staa= ge: ara::: f*all to the '1cor, ;191:g and ven:112:1=s due: is the i= media:s vi d d=y.
sc=a pasals vers :spai:sd and reused; othe=s had to be replacad. Sa damaged panels vers intact but va:a hant.
1 C.
Rosairs All damaged equi;=an: vas repai:ed or :splaced. Inst==s=:a:isa
'and equi;= ant is the area va.s checked or tasted fe; possihls c[ amass f =n the s:aam a=d vatar.
Twenty-three (23) panals of reflective i=sula:1=s vers replacad.
D e other effected pasals vara s::aightanad, reposi:1=ced and reinscalled on the s:aam ganarator.
All assential and automatically-ess::allad p:sssu=1:a: heata=s were :sturned :s servica. 3e vez p;sssuri=e hezzar cables were baked, hasted or air dried :s ras:mra i=sula:1=u resistases y
- n vendo: Teces=anded values. Caly : o of.he four cablas sher:ad to ground vars replaced vi h sparas. De acha: two arm en order.
A saw : sp ura disc was installed es the p;sssu:i=== quanch ask.
E 2 e deformed ven:11a:Lon duct was s::sightamed and a new louver vaa i=stallad is da dues.
3 e damaged lish: fix:ura and c=.bustien da:ac:~s vars :aplacad.
J 1
O
6.
5,Ys I:*s /I " ?wr*" "00:7-CON A.*D
!s-NC A.
SnC3 na : avis-Bassa hs::.:=an: a=d C =:: 1 (!&C) C::us has :ss: d logic cha==als 2 a=d 4 (cha==al 2) of :he Sn CS. sh=a 1: vas hdi=a:ad tha: the elesure of !?7A (s:ar.-up f eedva:a valves) led
- n the seque=:a of eve =:s c Ir/24/77.
I,=sh cha_=als_2 a=d a a the o=17 372:3 cha==als tha: actua:a 5??A.
C= 9/26/77, ifa1=:a=a=ca *. fork C da' OfJc) IC-422-77 was ir:1::a=
- n check the ai= staas li=a pressura svi:=has 75 3637A ch cush 75 36373. A calibra:1cu check was ce=ple:ad e= 9/27/77. All pressu=a switches ac:ua:ad vi-*da 12 psig of tha 612 psig sa:-
po1=:s.
I&C pa:se==al had sed 1=g to report ft:s tha visual i=37at:133.
C= 9'/27/77, tc.C IC-636-77 vas vri::a= :o i=vastiga:a the
- a=a'i=i=g i=pu s to ha S E C3.
?:assura diff era =.ial svi:=has 2656C, 2586D, 2583A a=d 26833 vara testad pa: ST 3031.14, Sectica 6.3.
ne sa: poi== cf the pressura diff ar==:121 svi: hss
=as:ad ra= gad f:== 176 psig to 137 psig, da sa:poht bei=g 177 120 paig.
De steam gn= ara::: laval i= puts to da 57?J:S vara tasted p c ST 3031.14, Secti== 6.4 Agai=, logic cha==als 2 a=d a vara
- ssted. All bis. ables ::1pped a: the desi.ad sa:po1=:s. na desi=ad ::1p sa:.1=g is.3Cf 1 013 vol:s a=d.he ra=ge of voltages for he histables tasted vara f s.3C34 vol:s :s
.3C9 volts.
I= addi.ica, the laval ::==s=1:::: calibra.1:=
,F was chachad pa: ST 3031.16. I&C tas:ad is: a-y,==-
11=es:1:ias be:vaan ::a=s=1:: : Sput and ou:pu:, especially at tha 1cuar ra=ges. C-579AS, C-S?9A9, C-S??36, a=d C-5?937 va:a well vi 'afa the acceptabla '.s as specified by ST 3031.16 and =o =ct-li= sari:ias vara observed.
na i= puts.m :he SEC3 f :s the less of 4 : sac:== escla= -
pu=ps wars =m: :ssted si==a this i=pu: actua:as a"ad***:7 f andva:a =nly.
his i=pu: does =c: affec de f and.a:a=
valves a =ai staa= 1.smia:1=n valves.
I= addi:1c= := tasti=g all de i=put devi:as, I5C checked C3792. nis 1.s the cabi=a: f=: 1:31: cha==als 2 and 4 All hputs a=d ou pu:s vara =s:=al is: axis:1=g pla=
===di:1=us.
IAC ci ackad==e*d "I cs==ac.d ass os.he hput and output buffs:s, a=d bduced =achanical vibra:ics on ha i_put buff ars, output buffers ai= logh pa=als, a=d ou:pu: rala7s vi ncu a=y sys:ss af f a==.
Da mai= logic pa=als vara heated siish:17 vi_h a has: la=p a=d sleuly==oled :s check is: ther..a1 va-ia-tiens, but this had no affect ou the systan.
l
-~
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23.
8
~~
on 5ep: :ba:.a' '50 c:2718 8d **5* si: th"**
.asdu of t'a: checa.
- uut:s us --*
a.
, 8
.,E.aned ll, a g turn.
s u
Sc:avs c. - 37 (ysa..cv & blus) V8 '- e Se:ansen 13 vct. "agi:
t su7?*i7 s C3731*
8 t-s,, ura u
.w
, asse:av<=.. ee= untt n ts s * ***~ s:aan 7:e,,",g [,.2 :_,=.c 12c37.1(7eadvaa:}*%o-
- hts scrav 'N *,
,...,s._
h i put Tar ='.32, 17 (la.,- s.,.a 6.
8 s
to shoroush17 *iI. g*
7 go losis *~
.,*Ms 17 ( ish: sida of
- v. c3.,.t. ain* a.7 had 3 loose sc:avs.
.s 's a main
%e ra aantuarc w;',yu; tish:8"'d g,,gt
.f,:2..
u 3-b o usu e==al 3-sta's ?!assca,
sida as Tarzin g scard) had :s ha ishta=ad, -
- the Sn cs.
., g iis ( ish:
gg,;,gstal s,,..,..- j ba ishganed a turn. '
- ts is a 7:assu:g sida og ;5) had channel 3.,_ g 4 (1es.:ha u, g.aan 7:assura,9.=g gpu:
to wa SUCs.
4 pgt u.hc7 3e, es 's?o Wa*sL*'ff,e,._, eau
. us.d " * " 3 " 3 "'
=
,a'
,,,a ase a s= seed -u=
,;se. es -e s,ggae.
- =7 Esttheant':
Sjah7toth****
.sen mais steam 18E *U**
bains locsa jumpers ver* J,,,,,,g g, pgavent an y gy, class:a du.,.g s a cs chedmus-g3:i=s was,. eed
~
h en ec:ch e 6. 1977
=*;a"*,"f:25'=L fe; iS* '7D** ~
a 20 W as
=p ;1s * @.1 /d" U.=g
~~
="-
~
(27?,,13,..ua.
i a charg :acords:s v M[._3ad t==
e== acted Ps:
es,=.3 i:.tsn. enh=the sys " ** * * *,,ue==
==-----s.na sys:en was...haaa==,=_ - cawtu:71,,
...a.
na:acade$
,__s_
ths **~ **
- 1 and Staan Cana 8,~,hpr,essura.72assurs
- g3 7: =sc a d 8'**
,,..a ea Encs os suaa d=,,= -.s:s vc
==,g,,
u v=
s..-
ea
.u,e
=
us oses
--.h e,uu viu 5;
., :=:a ---s
...,,os i=nuud =,..a.
c==aes=s -
T",**f.';Jt.h,;g21fi; 'ft$*=*=,',~E=a. a _aut,so,
~
~= = " "*h' " *
s a..d-s -
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' CCIC C'J.Unir.*.1 57"tCS "IS~ CC'.*NICIONS CONNIC"* SIC:IAI.
- IS"* PC~N"'
IICCRSIR C".A.NTr IS- ?C*N"'
31.i : :.e.
- IN7t. -
36:: a 753639A 1-1 24 1-1~
US 9.1.48 1
7336393 2-1 U2 1-1 37 9.1.48 2
753639C 2-2 U2 1-1 US 9.1.44 9
"5 24 1-2 US 9.1.43 4
P33639D 1-2 24 1-3 27 9.1.43 5
k.
1-3 7:2,536A 732635C 2-3 22 1-3 US 9.1.43 6
- L: 57938 1-4 24 1-4 US.
9.1.44
,7 1: s79A6 2-4 U2 1-4 27 9.1.44 8
Supply Cu:7u 1-3 U2 1-5 2 10 9.1.48 3
15 7. ?ava:
- . sins;$1
- -7 U2 2-7 Ulc 9.1.44 10
.:.~=.
7671 2-4 22 2-7 2 16 9.1.44 11 1,316 1-4 U2 1-4 3 10 9.1.49 12
~
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LCCIC C-3x; NIT.,2 S H OS "I5* CCITI""*.ONS CONNICT 523:Lu.
CONNZ:0 COMMcN -Q LI.Q T3
!Y.C Su::a CII" ?cIN-3L: :..s
!"iS" ?CI:C K.ICCEZZ C7.A.'iN:..
PS3637A 1-1 U4 1-1 US 9.1.44 1
?!36873 2-1 22 1-1 27 9.1.44 2
?!3687c 2-2 U2 1-1 39 9.1.41 9
PS2657D 1-2 24 1-2 US 9.1.44 4
}
7:32535A 1-3 i
24 1-3 37 9.1.44 5
l F 32686c
.2-3 22 1-3 29 9.1.44 6
C 37936 1-4 24 1-4 US 9.1.41 7
C SF9AS 2-4 U2 1-1 27 9.1.41 3
13 7. Fever Supply cu=put:
1-3 U2 1-3 U10 9.1.44 3
76ac 2-7 U2 2-7 2 10
9.1.41 10 7672 2-6 U2 '
2-7 2 16
- 9.1.41 11 L396 1-4 22 1-6 U10 9.1.41 12 f
y
-y.
,1-r-,,,
.-.---%,,y..,...
.,_-e....,-4n.----.,.-%_
..,.-s
,..-,-...-.-e.-..
4 4
_ 3; _
[~
{'
1,cct: cyxntr. 3 573.05 Is-C Ot!: Ots j
i c=cE : 5:=tA:.
LI.C TU cc:OE : CW.CN TO Is- ?ct -_
RIO R EF_.
C2xcE"._
IN77; 3tTir3 Is" ?cDi-M*
9.5.47 13
!s3639I 1-10 34 1-10 US 7536897 2-10 22 1-10 37 9.1.47 14
?s2639G 2-11 U2 1-10 29 9.1.43 21 24 1-11 25 9.1.47 16 1
2536395 1-11 7:526363 1-12 I U4 1-12 27
'9.1.47 17 1r l
7:526333 2-12 U2 1-12 US 9.1.47 18 L; s7939 1-14 24 1-L3 US 9.1.45 19 l
t 1 s79A7 2-13 22 1-13 37 9.1.45 20
/
r Supply cu:;ut 1-14 U2 1.14 U10 9.1.47 13 15 7. ?= var
=*
1-16 32 2-16 3 10 9.1.43 22
. F. =$31 9.1.45 13 2671 2-16 32 2-16 3 15 1-13 22 1-L5 U10 9.1.45 14 L336 j
e e
e e
e 6
9-
,_m
,.__,,___,._.y
4 g
I
(
23 -
(
IL:: a
~II
?COC 3t.: : u 25 7000
?.Z CE_II C x crI*.
?!3637I 1-10 24 1-10 US 9.1.43 13 1
1 1
7536877 2-10 U2 1-10 U7 9.1.43 14
?!3637c 2-11 U2 1-10 29 C60404 21 a
?!35373 1-11 24 1-11 US 9.1.43 16 1
?:325333 1-12 i
U4 1-12 U7 9.1.43 17
?:5253ED 2-12 22
.1-12 29 9.1.43 18 57937.
1-13 U4 1-13 US C604C4 13,
L; s??AS 2-13 22 1-13 27 060404 20 15 7. ?cuar suyply cu:;u:
1-14 U2 1 2 10 9.1.43 13 75hc 2-16 22 2-16 2 10 C604C4 22 Id.
2572 2-15 22
"-16 U16 06C504 23
- 296 1-L3 22 1-13 U10
, C60404 24'
- ~
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O e
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I A
e
1
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34 -
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t i
C= 1c/22/7,7, :he 57'C3 again ::1pped f:=n a spu:1=us signal. Da su :up I
7eedva:e: valve oc steam gemara::: Nc. 2 ve== cissed. nis ul:i=a:ely I
resui:ed is a..vs.id 5:aan C4: era u 1:v level :1p i=put :s.he snC3 and the sys:e= 'une:iccad as is:a= dad.
nis was the first spu:1=us ::1p received si=ce de char. :a==rders had been c:====:ed :s :he SnC3. All 1=f c=a:i=s c :he charts could be explai=ed except fe a p;nble= cs S nC3 legi N
al 4 c=p4ce ala=,
j i
7630. nis particular cha= sal ou che recstda was 6:e. 1::e=c17
!=* g, giving spurisus ::17 i=dications. Of the 44 atal char: reen dar channels, i
i this was he only one that had failed.
i l
I&C Technicians " checked out" the had recorder cha=nel fs: opera:ima.
nsy found )ha: :he channel was sensi:1ve :n a=y =e^=a* *= ? vibra:1ca, l
1: did rasp,ced :s a gives i=put, and :ha: the pens were s11;h:17 =isalig=ed.
i 7:ca all of de i=fc=a:1== gadared i: was con =1uded :had the i= dica,.1=n i
on hs had ' rec =rder cha= mal was an hput fr:a da S E C3.
l n a logic pot 2: under questica den was :ha c...:a pois: ("7630" I,aw Main Scaan 7: assure Trip).
h="ds other charts indicated so change in the i=put to Sn CS logic channel 4 Thus it was concluded de problem was is:e=al to da sysses. Is ---~ dad g de logic con :a1 diagram,1:
1 was dece=i=ed 3 IC " chips", 2 input buffers a=d associated viring canid i
have caused :he fault. IAC personnel replaced all of the above equipme==,
vish :he excep: dan of the i=:aresunec=1sg viri =g.
The vi:1=g and buffer can=ac 1:ss vara visually hspec:ad, and no faults vara ebserved. A i
fune.icnal logic tes: vas perfe=ed and ha sys:en rasp =nded sa:isfactorily.
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7ever I=gi=eeri=3 had cantacted Censolidated C=c :=1s Carpora'cica, tha
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sanufae:::er, and thai: representa:1se was on sita :ha =or i=g of 10/25/77.
The manufacturer also recommanded ^=~d--
ce same equipment hat TIco
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I&C perso=sel had changed.
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".'ha =annisc urer perfor=ad a responsa :i=a check on both i=:ut buffars l
2 questi=n. Se response.ima tas: showed se defec.s.
Ico I&C perso=al I
con =.d_=ued :n mer.it:: cua of tha two i=put buff ars is a :est sec. Ta11= a of osa i=p2: buffer did oc=ur en c e :est sa:, which indica:as :ha: :his was da cause of da half ::17 Da =anufacturer's representative also mak 4 icok a: tha logi= system vi:h an os d"escope. Ha van looki=g for any a: a:is, scisy points, but everything tes:ed appeared to be ::subla free. n a two hput buffers vill remain vi:h "l"Ica fs: fu :ha ast and evalua:1=u, while he 3 :C chips were :stuned ca the manufactura far avsluation.
The mann.fae:urer's reprasants:1va on 10/27/77 cs= piled a lis of addi-tional pois
- hey van: =enizared.
'"v"a I&C personnal a:a assis" ng to connect up :he recorders.
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A!:c: the 10/23/77 even:, a study was also c:=due:ed :s sea if a=y sin;;1e 120 VA c; 12f V C !aul: i=duced vel: age dip could have caused the one-half ::ip on both M3!7's and c1= sed the 50-2 50====:31 valva.
e.is study revealed ha: :s sis;1a faul: en these pcver supplies==uld have caused :his p:=ble=.
ha foll:ving cha=gss have tes= '= ace es the design of :ta 577.C5 sisca the Septa =ba: 24, 1977 i=cidas::
Annuncia:s;vindevshavebashaddedwharsc:=puta ala==s 1.
presan:17 exis: for 8
a.
5:aam Cana 2:m: laval Zalf/Tull Trip for hoch Cha=als
.a 1&2 b.
Mais Teaduatar CP Half /7ull ::17 fme both Cha=als 1 i
&2 Loss of 4 Easeto: Csolan: pt. p *:1p c.
2.
A new annuncia:s: and cesputar ala:n has bass added is: a S7ICS Tull T."_7 3.
The :ssat:1=s af all 57103 related ala=s vill ba dslayed le=s **
anaugh :s allov the c. e :e :s raes d the event.
These changes vill ha =ada as soon as possibla.
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Auxilia--r 7eed u== *a-Si:.e Cove :*or 3efore describi=g the =ad' fica:1==s =ade :: :he ausiliary f eedyt. p turbi=a (ATFT) 3 verso, the 3 ve=or acti=n vi.ish resul:ed in :he bindi=g, vill be described. yigyre 5-1 *s a d:a1.-i=g of de *.readvard Ceverno
?G-?*. speed see i=g =edanis=,
showing the governor is the bound up c=sdi: ion. L e sequesca of events creati=g th'.s ccedi ic,a is as follows:
1.
dien the 3edine notar was at a =isi. =a speed setti=g, :he -
speed setting shaft nu: vas fully :s the left. ne link raised the esllar, c=ntac i=3 the base speed se:.1=g nut, a
raising it and the "T"-ba: :s as idla condities. Sa pivot beart=g would be contas:1=g :he floa:i=g lever.
E i 2.
3ecause the governor is no: ro:2.1=g, the speed se: *.sg servo renaiss is a fixed positi=n a: idle (as shavn). It cannot move useil oil p; essure is available.
- 3. -ne thumbscrew is contacting the law speed step pi=..
4 As the 3cdise speed setting moto: is ro:a:ed toward high speed, the is11sving eves:s oc=ur:
4.1.n o speed set:ing shaf: su: = oves covards de high speed stop pin.
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4.2 ne link allows the es11ar :s move dovevard.
4.3 3 e collar moving dovuvard, allows :he base speed settist nun and "'""-bar asse=bly :n move dev=vard.
4.4 Sa floa:1=g lever is fixed a: the speed se: d.sg servo piscan end.
4.3 2e lov speed step pts and of.he * *-k pushes dava on the thumbscrew, which pushes d=v: on :he speed set:1=g pilac valve until the dashpo land com ac s the dashpot' plug.
4.6 3ecause the f1sati=g laver is now fixad as both ends it. stops moving.
4.7 3 e "'l'"-bar esatinuas dovuvard, follow".sg the collar.
l Se pivot bearing laaves the floac1=g lever. La "T"-bar continues dovuvard until the re:aiser screw i
contaats the floa:ing lever.
4.8 3e esilar separ'ates f;ma :he base speed setting =ut and continues dovuvard tsstil.he semp pis is the speed l
shaft contacts the stop pts in the speed set.iss shaf:
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link and collar.
his ::; se agai=s: the """*-bar causes fri=:ic=,tha: Iceks the "7-bar i= pla=e.
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Een de ru:bi== is star.ed, the speed see:i= se:vo piston =mves det...vard with i=c sasi=g oil flow, i== nas1=g the speed se::i=g of the gove=or.
We= the fica:ing level contacts the pivoc hearing, tha speed set:1=g pilme valve l
begins ta raise.
I 6.
E en the pilee valve es==:31 la=d c= vers ce==:eri=g por,
de speed sa:.1=g s==vo pis =n stops =ovi=g.
ei 7.
Because de torque is s-d" prese=c on.he speed set.d_=g shaft, de "7-bar is bound up, a=d the gove=c: is at 2100-1600 rpa.
8.
Ehen the 3od1== speed set:1=g =ata: is backed off f sa the stop, the "T"-bar falls deva to its high speed s:sp, dropp1=g the pivot beart=g. n e pilos valve = oves devuvard, i===aas,=g d
oil flow :s the speed set ing servo until the high speed condi:1on is reached.
9.
A=y changes is speed sa::i=g shaf pe:1: ten are =cv====any fonoved by de "T"-bar, pivos hearing, pils: valve, a=d speed secti=g servo pi.stan.
When the ATFT governors a:Tived as the "-codward Cove =c C spany factory, one of.he gove==m:s was placed on de tas stand.
- ile
=c observing the operation of the speed se.d5g 'li=kage,1: beca=a evident that a si=ple link f:=n de speed see:ing.pilst valve (plunger) to the floati=g lever would an=v re=cval of :ta ben:vs, coupling spring, Icv speed pis, "C" li=k a=d dashpot plug is de speed se::1=g pilot valve sleeve (see Tigure 2).
nis vould allow the speed se::i=g pilot valve :s evert:avel when the =c ::
vas set i= a high speed conditi== v.:h de speed sa:.1=g servo at the d.=1=um posi:1cn (see Tigure 6-3).
ne required parts were manufac:= red, es u=needed parta re=oved and.he governors vere reasse= bled. ne gove= ors were :estad at the Woodward fae: :7 and the tests csuf1==ed that he and1!ications did :emove all possibility of es undazized bi=d-i=3 of the governors. Surveinance :es:1=3 at de sea dan has also conf 1=ed that the au 47 feedpu=p =u:51=a gove= ors func dsn properly.
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P essuri=e ?:ver Relief valv-cn Sepea=ber 23, 1977, de valve was c==ple:aly disasse= bled.
s ne sais valve vaz found to be clea=.
S a sea:s on the so::le a=d =ain valve dis vers lapped. n a pilo: valve was fou=d stuck in the ope: positicy. a=d i: vas deugh: da the pilot sten was ban so the pilot sta= vas : placed and the nc==1s f
guida arma was classed up to ra=ove the =a:ks f: n the g=
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of the foreign matarial. h a' valve was ::asse= bled'and on Cctober 12, 1977, the valve was s::sked six (6) ti=es with a pressuri=ar prassure of app::=1=ataly 6C0 psi. During this tas:1st the pilot valve again stuck and the isolation valva.
'had to be elesec..
l
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.*2a valve v-a again disassa=hlad and u=dar closer observa:1=a
<1: was found that the piles valve scam was moving too far M3/8" vs 1/8" desired). It was also found dat the cleamascas between the pilot see.a and the =es la guida vers too small
(.0C05" vs desirad ' '- of.0C1"). D e clearascas were op'ened up and the s :ska of the piles was shortened by adjust:sent of solenoid pcsition. D e valve was :ssted again sucesssfully by st:sking is evalve (12).1=es on Cc. sher 15, 1977, at a p:sseurisar prassu== of app.u:aly 900 psi and one ti=a at a prassu=a of 1*::0 psi.
D.
Relav/7use/Wi-in cheeks
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3acause of tha =1ssi=g ralay is ha pressurisar elec:::=a:1c relief valve cons: 1 ci:==12, an ex:ensive raviav program of checking all other ralay cahisets was parfor=ed. All relay
- cabinets is the planc vers !=spected for =1ssj.=g plug-in ralays and fuses. A detailed review of drawings was =ada to date: mise da service of each 'ss1=g 1:es and its affe==
on plan: operacious. Se oua addi:1onal relay and ta=.fusas f=und =issi=g vers replaced. S ere were no assa=.141 fuse:1==s affected by ha addi.icnal d.ssi=g ralay a=d fusas. Se siss1=g fusas a=d :alay sc:a !== gn= ara::: tse phase bus cons =1, ala== and i= dica:1==s; talay cabi=sts pever supply and heata: supply cir:ui:s; =ais feed pu=p :a:bi=a luhe oli
- sak level indicati=s; and ranc:== coola== pu=p c==pc=a==
enoling vaca re: urn valta ess::al.
Neither the issi=g ralsy so: de fusas were c= strolled u=da:
the stacion jt= user and lifted vira cant:31 p;ccedura. nis indicatas the fuses and ralay were re=sved by unk=own persens aftar checkout and :sseing.
5 s
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Cthe-Actie-s Tollowi=g this i= cide== a ::34-3 g prestan was devel= ped and e
presented. S.is pics:a= vas ap;;cxi=a:aly eight (!) hours of iss :ue:1== a=d discussi n c=vering tha eve::s of this i=cids::,
includi=3 a detailed coverats of the ::ansie== a d the ac:1==s
~
takaa by the opera: :s, and a refresher ::a'-d g sass 1=s covar-ing the operatica of the s::aa and fsedvatar :.ptura ec==:31 system.
De thraining was 7:ssented to all is the opera:iss shift crews,
. the managenes: and s:sff level eng1=eers and the QA/qc s.aff.
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i 21:3&:20 5:artus Teedvater valve :o C ::: $2 vent cissed en a "h ::1p" of the 3:sas and Teudvate Rupture conc;si Sys:e= (57103).
21:33:13 Re:sived a c:=pleta $71:3 ::1p due :s icv level in C 30 $2.
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n:33:23 y.ais 5: san Isola:ia: valves venc closed.
n:33:26- ? essuri:e ?ose: Relia! Talve cycled 9 ti=as befs:s sticking cpen.
49 7
21:36 04 Au:tiliary 7ted Funy (Ar?) #1 ums fsedi=g #1 Staa= Ge:arata; (50).
ATF #2 did as: come up to full speed (3600 rys), and the discha.zs p;sssure was set, sufficies :s feed #2 SC.
21:36:07 Cpe:3:== tripped the reacts;.
21:37:17 Safeiy Teaturns Actua iss Sys.m Iaciden: 1.avais 1 and 2 vere i=1:ia:ed due :s reacto; coolame sys:sm pressurs less han 15C0 psi.
21:37:33 Eish ? assura 2njec=1es (EF*) Pmp 1-2 was on and had =c =al fisw.
21:37:49 EF2 ? ump 1-1 was on and had sammal flaw.
21:38:n Re-established laaetor Coolan: Takaup flow.
w n:40:22 Cantat= men: !To:=al Sutry Fu=p came on indica:'.=g the Quench Tank Rupturs Disk had bleva.
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21:40:36 I?! Pu=;s vers shutdova.
21:43:16 1"* = 7 3e'iler System was s:mutad and at nor=al.ksadi:1ons.
3:43:41 T-ipped laactor Caola== ?.==ps cc?'s) 1-1 a=d 2-2.
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21:44:03 Ea-established lase:ar Cao'
- 14 down flow.
21:49:37 ?u: ATP #1 is hand and : a 1: my to speed (35C0 r;=) a:d then 1=-tared the speed.
21:38:00 Cissed block valve== ?;assur.'ame Powe; 1411af valre.
12:13:22 Startad second Raactor Caolant Makamp ?nsp.
22:22:37 Started 12 572 ? ump.
22:27:24 3:sush: #2 Main Teod Pump back sa vi:h N * 7 3eile; steam.
22:27:44 shutdovu #2 UT ?.nsp.
22:32:23 Shutdows #1 Reactar Caolan: Mannap ? ump.
22:13:54 Shutdown #1 and #2 ATF's.
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Svstec Ces :i::1:=
sceas a id 7eedvate; he:are Cent el Svste 1.
Gene-al n e s: sam and fandvata rup:2:e con::a1 systa= (57?.::3) 5.s as au:= math syscas desi;=ed to p;ntact agat=s tha fallevi=g i=cidents:
1 4.
Main staan line rupture, ei=her upstrea= or desmatress of sais steam isolation valva (M517). 3 11 canditics, if a11 cued n proceed, could rapidly blev deva both staa= ge=a ats:s, resul.1=g
,t.m a rapid ICS cool down and sharaf are a :spid reactivi:7 i=sar:. don under cartais cara candi.1on.s.
h.
Main feedvata: 11aa rupture If on the staa= ge=srats: sida f
of the feedvata= check valve, this is app;ssi=ataly the same assident as the steam line rusture; on the f aadvata: side of the feedvata= check valva :td.s results is a total less af feedvatar.
c.
loss of all fsedvatar.. nis (as well as the above incide=:s) could resuh is bo*
g both staan generats:s dry. !! this happens, there vould be n,o seems availabla fs: :-~ ' g a"* ' ' = 7 f andvater pu=ps as re=ove decay heat.
n-.
(""
d.
loss of 4 reactor coolant peeps (RCF). ni.s resuhs 1: inas of mactor esclan: flow and caraf are a'~d'*ary feed.a:a= is
- 5 seeded to as ah11.sh ranc:ar coolan natural c1 =ula:1:n flav.
t ne 571cs, upon indica:1au of esadi:imes a, b and e above vill issizza both stama generaters (close the sais feedva:a valves and ais stazz lisa valves a=4 ::1p the tu: hine) and s:. art de ='~= y !eedvata:
system. ' * = 7 feedva a is inhiated en kasp steam availabla fs:
the auxiliary f and pump turhisas and tm :e=cve decay heat f:ma.hs :eae:::
coolant systas. C=ca this is ac===slished. the opera::: vi'1 have ti=a :s begin a cool down is an orda:1y an=ee.
2.
Das'r= Criteria D a design critaria fs: the 571::5 and da a ~ y feedvata systen are as fallsus:
A.
De system must perfers 1_s safe:7 f.use:1en af:a= a singla assive failurs has occurred. 31.s means that the s - 'e d
failure of any pove: supply. pu=p, :urhise. inse:.usent or control systen logic channel vill no p: ve== the system f :n removing decay hast f;ma the reactor c=olan: system.
b.
A mais staan line break upscEasa of the M517 or a =sia !sedvatar 1
break downst:aan of the main f eedvatar isola isa valve vill disable one steam ganarstor. A.f:er this event both a ~ =7 9
f eed pumps and turhi=es v121 he aligned to the :e=a1=i=g i= tact staan gese : tar. his :s=ef=1:3 steam gemarats: has adequata capacity as remove the decsy heat f::a tha raastar :solan:
system.
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2.
Tune:1:nal Oese 1stien (Rafer to Isc1:suras 1 a=d 2)
~
The 571C3 is divided !=: radunda:cy, diversi:y, a.d tas:abili:7 i=:s f=ur logi: cha=als. L: sic cha=sels 1 a=d 3 fc= cha =e1 1, a=d logic cha =els 2 a=( L !s= da =si 1.
1: one cam a: ces lagt: cha==e1 has a: Ac pcvar supply, de echa: a
~ supply:
18 sic Cha==e1 Cabine*
- svar Sereiv l
1 C3762A T1 (1207 Ac) 2 c3792
.T2 '(1207 Ac) i 3
C3762A D17 (1237 Oc) 4 c3792 D27 (1:57 cc) 4 Zach 1:31= cha=al receives hs f=11cvi=g i=pu:s v' ' ' vill cause 1: to trip:
a.
Six pressure switches, :vo on each = min steam lisa ses at 600 psig decreasing and one on each mais s-aan li=a set at 630 pais decreasing.
w b.
Two mais feedvata prassure differe= dal svi: des, one from each ad= fmedvata lisa (see I= closure i for sans1=g points) set a 177 psid staan genera::: pressurs highar i
than nais ieedvata: 11=a pressura.
di c.
Two level =sasmittars with bis ables, one on each sensa gena: star set at 17" dec:aasi=g level en ce sta...,.
sage.
,~
d.
A contact from 175 pump power sensi=g ci==1:; c=szac:
opens on loss of all fou: 1:F's.
n a 571C3 cabisats censis: basi-*"y of an AC and a DC pcvar supply, i=put buffarm, logic modulas, and output ralays. D e ou:put relays d w ergisa :s ac:ua:a d ai associa:ad equip====.
hey also :- =
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out a light on da cah1=st when in da =1pped s.2:a.
i Each i_put :s $71:3 has a test svi:=h and lish: so that a ::1p of dat input can,be
- -d m
d for tes 1=g purposes.
ne on puts f ma de 571:3 are c=ntacts f:=n.de ou:ps: :alays.
These contacts a:s is the emntesi cir=f s for de 571:3 actuated aquipasst. Mos w.nents requi.s a 57103 logic chan=els :s trip :s ac =ata.
See Inclosura 2 fs a 11a.1=g of ac:=a:ed equipment..
De:s is a block feature assoc'a:ed vid the inv staan pressure
- 13 To prevent ce system f sm actuating on cooldcun, each ingic channel has a " block" pushbussen on C3721 and on the 571:3 cabines.
O Uhen staas pressurs gens below 630 psis a ble.k permissive light is ressived on C5721 along vi.h annunciatar and c._,,4 car ala=s.
- aan the black but an is pushed, ce channel vill not ::13 on law stasa pressure and a "MN 5"l11 *=0E ?1Z33 TRIF 31.I:" light is actua:ad on C3721 as well as assuncia:s; a=d c= sputa: ala =s.
Cn a hestup the block signal is autsma-*-='f re=cved *.hes de staa= genera:m:
pressura az=seds' 630 psig.
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nere is another block which is utili:ed== coold=vn..If.hs decsy hes: sys:e= suction valvss f :s the reac:c: c=ola=: systen QH11 and 12) 4:s ope =,
h10ck vill preven: the openi=g of
- he a:e.as inla: valves :n the auxiliary iand pu=p :urbinas.
his j
prevents the 571C3 fr:n s.ar:1=g the auxiliary ! sad pu=ps when all ::ac::: coola=: pu=ps are se== rad on shu:d=v=.
Bis "hicck" is autsta:1cally re=cved when the decay heat system is shu: down os startup.
4 Svsta= lati:
a.
n a response of the actua:ed campone=:s depends on the type of tript (rafer to Escissura 2) 1)
on low staan pressura on ene =ain s:aan lisa, both :aam generators ara isolated.
I= addi.1==, both a'~a.y fmed pu=ps a:s alig=ed :s :.hs staan ge= ara::: whid 1.s above 6CQ psig.
I.f both s:ssa gescrators so below 6CQ psig, both staan generators are isolated and p,,,o, a'~d = 7 f sedvaza: is initiatad.
Z.! any other ::1p (such as inv staan generats: level) accompanias a inv steam pressure trip, the valves vill align pa: low s:aan p;easu s trip logic.
2.
Cn high feedvatar pressure differential or lov staan g_~:.;,~
generata level on one staan ge=ars:st, both stama g
generators are isola:ed and each a" d=
y feedvate:
pump is aligned :s feed its respective staan genera:a (1 to 1 and 2 :s 2).
~
3.
On loss of all four :sacts: emolant pu=ps;-Each a' d= 7 f eedvater pu=p i.s aligned to 1:s respec'tive staan,gn= ara:::.
Aa staan gana a s:s a a not isolated.
4.
On all of the above events, the 6thise is ::1; ped by the 571C3.
- b.. ha a"=dt** y'feedva:e: pu=p gover=a: c=nt:cl svi :h i= the emntrol room bus ha.s 3 post *.=us:
Auso-Essan*'=' (371C3) l ICS W
Is the as=n-essential post.d.sa, the
~~d
==y feedvatar pu=p is in auto-essential level cont:31. In the ICS position, the auxiliary fmedvatar pump is on level con==:1 f =a.he IC3; via the Band-Auto sta: ism. In manual, the a'~ary f eed-water pump is controlled by.he ops:sto vi.h the laise-Laver suitah.
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c.
ne STROS s:arting of the auxiliary feedva::: pu=ps viu au:o-
=a:1ca n y reses ence the ::17 c=nditics en the i=put is re==ved.
Nc=e of the valves, h=vever vin * :a:urs :s chair origd-='
pesi:1=n u=:11 opera:ad i=dividuany fr:a da c====1 ses c a sev ::17 c =di:1ss occurs.
3.
Svsta= ceera ics
~
1 h order :s understa=4 the opera:1on of the 371:3 sys:s=, 1: is bas: :s fa nos ea various sys:en ac:1=c.s u=da savaral accida=
conditions. D e following casas will be considered:
. a.
Staan Line Rupture f b.
Teodsa: : lisa Zupt==a
- c.
Loss of Teedva::: pu=ns
< d.
loss of Tour laaeto: Caola== pu=ps t
Inclosuras 1 and 1 should be used as a= sid to u=dars-W' ! the dese 17:1.-n.
All discussions assums ICC: Ty opera:Los at start.
Some sen-571:3 ac.is=s a a c=usidered := aid is undarstandf=g the
- ansians.
(1) 5:eam itse 6:ura - Assuma staan lisa i shears d=sustraan of usn'. Steam pressure vill spidly drop.. Was either staan ge ara:ce reaches 6CO psig, all !=ur ingic cha.=sels will ::17, isolati=g both staas ge=srat=rs.
(See helmsura 2 for specific valves.) De M3:7 takas five seconds :s shut, the ain feedva:e: isola = ion valve 13 secruds. 3oth s:aan lines win probably drop belev 6C0 psig, :harafara,
=t-r*s y P
fsedvatar vill sa: s:2. u= 11 m staan ge= ara: : :scrvers
- s above 600 psig.
A"* '* =7 f sedva: : pu=ps vill align as described in Sec.1oa 3 above to f eed the staas generat:
that f1:s recovers to 6C0 psig, vi.h both a-d'd = 7 f eed pu=ps. na 571c3 vin ::1p ca :n:h1=a. Sa :aac::: vill,
- 17 on law prassu:a.
Man both stama senarats:s a s abova 6C0 psis, de :Tip c ndi-tion au =matically clears and the a==espheric ve_: valves may be used for p;ssaura ce= 31 cooldova if reeuired and r
p;svided no othe: ::1ps arm prasant.
6:ureLinebAssumefeedvaca: 11== 1 shp.:s up-(2) feedva:s st:aan of the feedvate: 11se check valve. Teodva:a pressure vill rapidly d sp.
W en either fandva:a heats: d:sps :s 177 psig lass than stasa generats pressure, the Sn cs will isolata both staan sensrats:s and align.he a s'dW feed pumps to thei respec 1ve staan generator (1 to 1; 1 to 1).
O s rasc o vin ::1p on high pressure a=d ca 571c3 vill trip tha turbins.
(3) lass of Tour leac:s coolan: *$=ss - 13 an !ou reacts: coolant pumps :13, :ss tursi=a v1.11 'Ja ::1pped by de $71c3 and de raastor protectica sys:es will ::1p the rase:me. na Sn=3 win ini:14:s auxiliary feedvatar. See staan generstars v111
=!
not be isolated.
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