ML19317G498
| ML19317G498 | |
| Person / Time | |
|---|---|
| Site: | Crystal River, 05000303  |
| Issue date: | 04/11/1968 |
| From: | Moore V US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Boyd R US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8003180781 | |
| Download: ML19317G498 (3) | |
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n.,Boyd, Assistant Director for 1:aactor Projecta TERU:
S. ~ Levine Assistant Director for Reacter '
- Technology, DRL V.. Moore, Chisf Instrumentation smd Power Technolo27, Branch, DRL FLORIDA POLIER CORPORATION, CRYSTAL RIVER L'tIIT 3. REVISED ELECTRIC PC/;lER REVIE4, DOCKET 50-302 IEPTBtDRL TAI'- RT-606 This is to submit the attached revisod' Sectica 4.2.2 of the report. to the Advisory Com.itten on Reactor Safeguards for Crystal River Units 3 and 4.
Ihis revision was made necessary by recent design changes, Amendment 5 reaultin( frou tha applicant's decisten not to construct L' nit 4.
Specificall:,
this ravieion. deletes reft:rence to Unit 4 and the correspondin ; reduction in componenco-as liatad below:
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Start-up transformers from two to ecs.
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4160 volt eu:;incerad safaguard buses frem three to bm.
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Olmsel generatora !ron three to tuo.
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4Q volt $nginccrad,safep, card bucun fran three to two.
Theso. dusiga chanws do not in.my ur 21:er etc co.,ch : lea 9 of the original uvaluation.
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.The appliccat's studies of system 1oad scaleility nhov that the ayatan is L eble to withstand' the loes of a 1200 nt:uett elsewhere.in the system or the t
' losef of.the Crystal niver 885 Mee unit without effecting any other unit. A
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systs.T of selectiw " load sheddias contributes to this stability.
Tha'230 v cubstatica at the Crystal niver S'tatic_ is connected to the er.isting
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FPC transmission network by four circuits, two goin;; south to Curicw and two going ~ east to Central Florida. Thara em aho two coal-fired mits on tha -
, Crystal River-site '(units'l arid 2): that are connected to this substation..
This:sutistation is considersd to;bel airaliable source 'of power for _the. Unit 3
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Startup Transformer. ;In additioni the outgoing power can be discoenacted to por: sit UnitsM1 and 2 to feed Unit 3 excluainly..
The st'attup transfor:nar vill ha sited to cupply enginacred safety featun loads or cafa shutav, n 1 cads-for the unit. If the startup trenaformr fr.11s,
.the applicant has made proviaion to inclate the 4tutice guer tcr frem thn 500 kv syacen by disconnecting ' links.in the isointed phr.-cc bt s r*ad to suaply
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safety loads throut,*5 thn' Unit Auxiliary Transforrer.
'n'ith the linko cpan, power can he supplied from the SC") kv subution 'Ai& ts connected to c:te exid by 'rwo tranoisaica lines. Th ir;plicant estimttac that la tha cwt of et W of nornal fced frota the startup trasfomar, cfNita po:nr cr.a be rutor-d tc tha bms in. I hear. ' 31 arrunpnt p r:d.t. o't-dte
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rritorica 39 for the post-accident lam;-tcen cocile rq J ra-Ants.
.m A11 b 2 prbd cf ti:= ic:aulately sanowig an accidenc Gefor.*
che links' ara discennected) when the failure of tu-mrtup trmfomar wou.I.d cauac< me Ion oi' of Nitu pcwor. Chila for this parited J C:.e.4 A 1x:m:
of Criterion 29 is not. rat, we bolhw the de.ci:;: la ade;um. "i b li m the grid (not tha startup tratafor:ar) in the liciting itar. cff1cti:q aff-cita pat er reliability ite.ediately follo ring on accIJwat - end tha accomanying generator trip. "herefore, imacdic::aly folicving an acetht, admAant trasformre ucaid add-110th to the nli bility of eff-site ?o.ect.
m ca crucarodundant transfor::: r.arrr.gecant might becoms a limit 127, itov, after the';; rid has ceased to ha in a transient state, we believe ndur dant trans--
formers are required to protect nr.ainnt, random failura during lona;-tern coolinBe-after, the grid has recoversd' to.its steady-otate condicion and the ECCS is. in' the long-term cooling mode.l.
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. Yo'r the' zwasons statod ahevaive believe the supply of off-site power to
- enT neered safet.y features'aud aafa chutdova loads - f s adequato.
i 4.2.3' ow;t te "over The angiru..rai safsty feature loade and the.1 cads nquired for uafa ahutJcvn are connected to two 4160' volt bases and the correspendiam e,co 420 volt.
buses. LThe leads are distri'auted.so that, if 'one diesel fails. to start, the renaining ena~ can easily carry ttie e 2xineered safety feature loads or~
th9 n%cdcasa-leada cf th.unic., Sufficient fuel will-W.atored to allom
, oneidiasal,,te operate ac; full lead for 7 days. [
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The diesels will start' upco f (1)" loss of voltage on che.4160 volt bus,
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(2) initi6 tion of safety injection'operctics, or (3) renetor building hirh
- pressure. All bre.&ars on~ the bus are automatically trippad before the diesc1 generator breaker elesen, and equipment is then started as : requitad.
Under :: ident conditions' the engineered safety features are autimatically started in sequence.
Ursakera are interlocked' to pretant one diesel generator from being connected to aucther.
Equipment will.be located so as to minimise vulnerability to physical damage
' from sacchanical causes, fire, or water. The engineered safety featurs 4160 volt switchgear and 400 volt load centers will be physically separated frca each other and from the unit auxiliary switchgur, and located in a closa I structure. ' Diesel generators will be located to minimize the likolihood cf
- mchanical, fira, or veter damage. The application and retiting of control, instra.entation and power ca' ales will be -aus as to ninimise their vulnar-ability to d teans irom any sourco.
The 250/125 volt rx: systo:a vill con 21st of two bus acetic.an, each supplied by a b 2ttery.ud bettsr; chargars. All ent,incared safety featur* sisiteWar buset su'A control buses will be fed froa both battery acurces threns allicen diodes to ens 3re centicucus control pem: even if e-o battert or LC hus faile.
Tvn epara 125 volt bettery chartern are furnished.
Un beluve chat the ua-dtu alectrie nyscaa for Crystal Al.er Unit 3 ce>11aa
'rtth critarten 37 ia t: tat to. sin;;1e failure dould pre rent ca.+r Fre a W.m nupplied to th: =inimu= 'mgineered anfety (m.tura Imda f cm vi-sito,ow.u.
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