ML20024B178
| ML20024B178 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/03/1978 |
| From: | Flint J BABCOCK & WILCOX CO. |
| To: | Boltz D BABCOCK & WILCOX CO. |
| References | |
| TASK-*, TASK-GB GPU-2275, NUDOCS 8307070229 | |
| Download: ML20024B178 (9) | |
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'fr.c f.llouin; inLr:1tica fu
.a. pr.rtial resp;n::e to cc=2 of yon c_ue..tionr..
- 1. O. - If renetor psdr is d itbled, it: L!O doubic4? Uly or vhy r.st?
A - Ir. c perf. :tly desir.nA renetor, a doublins of pover voeld prof.uce ve.y ne:.rly a doublir.; ef Da, This is ast:u=in; that c1ch fuel ar.v--My p educes ex.ctly the srne atount of power es a,ny other i
c.ssc::bly i:t tha core, pricary coohnt is uniforoly cixed ar:1 dict.ribut r1 t!coucha,ut tl.a core, etc.
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. In,rer.lityf this dre. :: not occi:s due to":
n." Centrol Ibds (particlly ir...erted or,vith:Ireva) b.
Orif cc Bod: - restrictir.c coolant hyp?.uu flo*.r c.
Lt:w-l Ikarnable Poi:.on Roh.c flux deprestion d.
Ikt:-Unifc.r.1 Flow piutrittition r
Inic.t Coolant t:ot totally r.hed c.
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At la?r.L three different fuel enric!= crit:;
Ihrrafacturing tol:.rru.:c. en fuel poJ 1et den:ity, cladelir.;
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thie'r. nee::, fuel pellet to cindli : c LP, oxihtien of l
clndding, etc.
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T.0 Cr.cl..nt Flow ray be either 1:c.iner or tur':*: lent 1
Icesirsp!c R2 tion - 235U, P33') ar.2 the.ar *:n:. Pluter.it'u In. topes J.
De 7rce of Underroderatica
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C:1uMe JMren Concen. ration 1.
Cred Iaildap C c/nefectar InterL:e e ffcetn 2..
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~2-3/3/78 Ti.cso various interactiar i cancrally produ:e a Olc71fice.nt
- redi:nrittalon of the c.'re rht.: w.i th in:rc2:ic.. r: actor pottc-r.
Oter c. cive: p:ver ran::, the d.,m. lor coeffi:icnt is nearly connt nt 1.1 rncnituda but d:es h."a c. tendet.:y Lov:rd: :stvra-ti:,a. nt 100,*?.TP.
As heat fit:r. inema es, e.t first the hen '
tran fer coeft:ciw ; ill increa. du to the clo:Ir. of the fucl pc11ct/c1;ddin; cap and trnuniaan to re.::1.e:te toilin:g.
Above" a certain heat rimc, filu boilin; (in a limite.1 c:. unt) ar.1 decrecse of cod.-rater density re du:e tath heat trca:Cer and neutron r.ader P.i.on.
The result is r. power decrease or at
, Ica:t a ceneral po-ar caturation point beinc achieved.
A largir delta T acro::: the core vill tend to drite ;cver towards th. Lott :1 and cora perir:2tcr due to 1:n:!er=:lernion.
- Doppler brer.'.en!nc of the 233U and 239-252 ?u isotope recen'nces i
a Vill al:o ici.:e a..flur, shif t.
Uraniu. 23, ani Plutoni - t 2? O and 4
i 212 1. ave si.. ficant non-fist en cros: scetior.s and 239 Pit aljo has a signifl..:nt' prn.sitic, cap'ture cro = section.
The end result is core clonely appronicated by 1.25 ti=en the LIC rathar th:n dsublin; of the Lli3 in the Lottest se :=blice.
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- 2. Q - LLy do ve have (T: I-I) the 195'F linit in tha heatup r.nd cooldown curren for P.CP conbLrr.tican? Vny, en heatun cast we vait till 197F to start the 3rd RCP!
A - The initisl her. tup /ccoldo in curves provide
- ty Staf ere two cera.rcto cur 7cs. Thccc two curve: vere cochinci. into one by Jr.*f Frit:en in order to avoid " conf.:sien" duri:;; the two evenM..
Tr.r. co.; site curve, therefore, reprc:ents the
,rr rc:trictive
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cor.ditions of either it.div.r Inal casr. This =2tter 10 still being pi.rcued by the vriter..
- 3. Q - I!cv and why d:c: car.arlite reactivity cht::ce with core life?
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Tcc re. tivity varth of : 2riurs vill sic cly *::erec.so a: core life procrecues and a sicnificar.t cat:nt of fin:Ile plutonina is produced. TM: occur duc.o the hlchcr fra: tic:uti yield of pr. Mhht: (the 53 hour6.134259e-4 days <br />0.0147 hours <br />8.763227e-5 weeks <br />2.01665e-5 months <br /> precurece of. s::::riu:-) fro. pintonita I
fi:::Jov: ex. pared to the yield fro.. uraniun ficsions, f
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!.. Q - Ho.t c:id why doen xenon ro.:t*..-ity chir. :a with core lif.:!
.I A - Xenor. vorth. vill t*::.1 to in:rea: v f.*.*. core life hat tny co thrm, inh n transiv.o d p uc vhore : ;.ct.f.vity decrensco ror a perjad of ti:n pric,r to Ir:
c'. :;;. Th r xen.. renetivi.y svind is a:.. t as larc.- an th.: pr.,1.;;cd by c..r.arit:n.
Siner xenon h?s a Ic.co thc: al c.rtr.: cross section (u; pro::.
itat 4y 2.2 ni'.' ion hrr. ) c.nl a si;n'.ficant decrean. in cro:s cceti an above thercal ener;!c, it in very concitive to the flux spectrt.:2, copec'.'1,1y fin ? 0;2 t.".= hardeni :s due to the incre?.:o in plutoniu.2 vith ccre lifctica and a shif t in ::darstion (decycasic.; witit lifctina).
.~
. Ac vith cansrium, xen.n has a diffe: rent fraction.m1 yield depe.4in.
upon which icotope (urs:.ium or rittoni n) is itn,cotuccc.
- 5. Q - Ho.c cn<*. why does individual end tcte.1 rod vor th vary v,ith cord 'a c!
=.*
- A*- Several fe: tote: affect red '. orth such c';:
n.
Flur. Redistributia:
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Isotopfc Chnter c.
!bderation Effcets s
The "checkerb:nrd" lo:iir.; p.tt:rn vill rc:31.t in higher power Sencratics and therefore his:er flunce. In a fttel ascenbly havin a larcer enric.m..t.
A c:.utrol rod in arch cn :- senbly effcetJvely "sces" n hither finv. and th.ts can effect ;o.:r generation on.' later s:.1= th.: : control rod in a relati.cly los "vorth" po:itions.
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As core lifer pre :ren.:es, t!.- ini: haly hither crriched necer.My will have produecd tore ene: gy C.:G) thr.n it: lwcr enricho:1 neic,t bors. This rer.ul.ts 1: :. flu.v. rc.'Ir.trik:tian to other asacnblien, in order to :uintain s cor. tant core powr, pro?.:::in; an.rca of lover relet.i.e riu; v:rn to the c wo:iatt d control rod.
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.s Tin high cro : cccti:n of catth, in the thers'.1 energy regio.t beco cu 3.a.: crfcetiva as plute J.i:: 1:stor.. t t.1d in with core 8
lifc La:e* uj.sn th. plutoniu:t re::en?.n:ce in the epithermal re.;1on. T:a renititt.n" nn-etr.ct chit't, also d:e to I:tercated stnderr:#.eration, is tu e.!c a hIcher energy.
There 3: al:o 4. ten (e.cy for accentlic: at th'c coro ed;c to nec n sorter r.pectric: due to re'.uced p rasitic captuic its coluble baro t with innreasin co n life.. Thesa es:c::Mie s do not contai:t
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- 6. O. - L"cg the: TML.2 Core Phy !.cc
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ta.1 sho:t LP? inte al rcactivity vc rth 1 cycling off a.t. -2,1 delu k/% frors MOL.on?
A - I believe by LPP you :_:tuntly =ct.n LE?. The relative vorth is '
a function of ato= density, effective crc *., and ces:s section.
As care life propessen, u;dcr sh er. tion increa:es thj relqtive neutron flui. c.wrcy specit tc; and :Ir.ce tore. Is enercy* dependent..
its cro:s scati.. decreases to,a s:9.1 extent.
i Kar e 1:nortantly, sinto the poinen it in the chips of a rod,
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sitrfoce d'cpletica oe:rs first. This is'dt:c to the r.ofun-flux-sp ctrun at th7 roi nurface ar.d relatively large arcA. As the._
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rod nurfe.cc pru,re :1ve'y r:ove irc.exd, the. effcetive rod dir. st ?
(or zurface arca} decre t:cs, presenting a d;.r_11er tr.rcet cra f.ar neutron:. The =urface ccrben iny.:, provicm:ly bcron carbide, b.q;4.no to cet es a reficctor and s:httece neutron: back out of thi rod prior to ct orption.
A boron depictic:t con'.irxes, the rod beccnu: :,ure tr:incy.rcat
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to neutron:. At th2i:c lo rar concenttationn, the cror.s section:
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o f 1:rau:Ina and plutonit:: beco=c r::re competitive for r.cutren capture cince'th heavy r.ct213 decret:c Ic: rapidly than~the lorou c4.. centr:. tion. 'Tna cnd rc:::lt is a rc=idu - of boron changiri; eery nl:vly viti core life. Cor.plete dt ;1.ction of the LLP i: not possible th u-h
- r. icon: eith a larcer cross scetion i.e., Cadesliniu: or :str.riu:; could rc ult in loter renidun varth but do pre:e:d. other considers.tions.
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Kot r.tilrenzel in yotr question tut recq:ently acked by the C;O':
in vFy cb.
I. s cru utilized. Th: sta.:e.rd c:wver they h.au re:civ61 ap.:rrs to be "to incre.cc core lifeti te." 0:.h:r fr.etor:
re e:
- 1) to redu:e pourr p ahte; in hi:;her enrichad e.n. -rblie:: at beginr.in;-of-life,sud 2) to insur2 th tokrator,couffi l:ut is negative -when first opere, tin;3 95,32.
- 4 The pov:r ped.Inc reditetion and nc;a.tive nod.rntor coeffir:! cat inpro te core povar div.r.it i.ica cr.d hava =+.fety related i=,11-t c:stio:.; which mitst be oldec:.::ci. lens viL;; in:ressed core "lifetir:e.
- 7. Q - Ucitfd like come ent:.:pic: (po.t:r' histories) of whna 'D:I-2 does :-:::
l have to vait on "within 10.': of 10% xen ::. eqttilibriu: reactivity" to co above the power level cutoff and the theory behi 1 thia.
A - In order to proporly ar.sver this gestion, I will h:tyc to c /wa*.e sc=:: computer ::odels as hnr.d ce.'.culcted ex2nplcc cre too to.aut.
Do r.ot have suff5c: lent Lice at pre:ent but vill attenp.t 'to cc.n.cate extaples in the near future.
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As you kt - r, the existiny. TMI-2 Tc:h. Sycas are worded differentV.
th$sr.- T:"'-l's -recnrditc thi:a st:b,t ect crid 'th.:
sevcent di-fferent -
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ccues cctually exist.,
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- 8. Q - Jin Floyd cays Unit II micht have two cornbic incore dete:: tors.
True? If co, how will they work?
A - One navnble incore detactor as:::';17 vill ha inctclied in Uni *.
f II for flui: nappinn onc of four spa:ial cc=c61.tc...
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Oricin9. pic m vore for tro driv. r. to oc installed and additio:c.d..
f p
m..:c. tin; p.t: to albv t:oving tha de.nter *m t:cver t1 core h.. :.tir:,nu, Thir pinn vn: Icter retit:ed,r.nd or.ly o i:: c:ount f.c loentica in now planned.
Ti.e detector chenth has en 0.D. of 0.002 inrheu and is appro:.:-
ir.n'ily 135 fuct long.
'<.*ithin the hto:Lu: =herdh la a pair of in:. ult.t.-d etccr.rical condacte: s, one a signal lee.d cn1 the othe.-
n bac!:; aund lead.
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Not addre-.:cd in your qtestlo:t but fregently n hed bh the Ch3'r 1 vb/ the 1.f s arn utilizei.
Tr.2 standsrd an:.;ver they h.we rcccive.1 algmers to be "to incr:::e core lifet.i n." Ot.h :r fuetors cc c:
- 1) to redu:e power p.ahid; in hi;her enric:.~1 as. -blic:: at bcai;:r.In;-of-life,t:ad 2) to int.nre th > roL:rator,coeffir ;.st is ne;2tive when firs
- operatin-3 95$T:5
~4 The povs r peishing reditetton and :.e:s.tivo co.'.trator coeffi icnt ir. prove coro ;,over dic'.riintica cr.d have esfety related ir..li-cations which n:tst tc ul'.rcse:i :.lon; wit.h in:rt:ased core,.
lifetime.
T. Q - L'ould like some en:mple: (pov:r hi: tories) of when 'd:I-2 c.tres nc:-
I have to wit on "vlthin 10.1 of 1035 xe::., eq tilibriu reneti rity"
- tc co stave the power level cutoff and th.: theory bvhi I thia.
A - I. order to propt.rl-/ cnsver thic renstion, I will have to c-n.t'.h no= : computer uodels as hnnd eniculate:d ex2 pics are ic:, te..au:.
Do r.ot hr.ve suf f.ic:hnt tico at present but vill atterp.t to gc.mc.tto.
cxtapin in the sse-:nr future.
As you la v, the cdstinf. TMI-2 Toch, Specs tre worded differentl;*.
thar.- T:'I-l'o -regnrf.irc thi :tbject te.d *th:. scvcral differce.:; - -
. k..
cnues cetttelly exist.,
8, Q - Jir. Floyd says Unit II :.ticht haza two novablo Ineore detec'.orn.
True? _If co, hov vill they work?
A - One ra te.ble incore detector as:* bly vill he inctalled in Uni'.
II for flur rusppic;; one of fcur spe:ici sc:c=blien.
f Original planc were for ttro driv to be in :tal. led and addition:d..
ra..:nt.in; pads to al.1.ov tovin;* tha d'.
eter t.o serter11 core lountir,nu. This plan va: lct er retice.1,t.nd or.ly on:r coun!. ' ac locs. tion 12 r.ov pinnned.
T2.e det.ector chenth hn.: c. 0. D. o - 0.002 inchc= en't is appras:-
f rut erly l~4 feet long. Ult $in th: *eto:tur r.herdh is a priis of in:.ulat. d electrical cc:ulu'tcra, one a sit:r.:tl ler d cn1 the ot.her n bact:f.ound lead.
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-G-3/3/7L Thr cetu :1 c::itter 1 approxt::.at.ety one it.ch lon; ar.d is endol r.:i ttet.
Cad: lint 2 van c: s:;en a: it is a pronpt rc:, e.d.
ina a ; opp:2d to tica delriy.!- rcsp.. :i of rhodira. and v:u
, provide a better si;t.11 ren y n:c c:
core.
it travels withln the In t.he center of c. sta -lar.1 CPUD 10 a hollow tube.(spacer tr.be) with en I.D. of 0.C.33 inches.
clor.ud in tha renett citd and nor..nli.This cpa.ecr tute is scal veV..d the opcratin; ficor end.
. han a sva;cloh fittir. at The noveb1c detector is' vonnd on a riotor driven reel tr.d is in=crtal into the spacer tube. Le dec :-tor 1 nor ::117,parh 2d appror.1 tely cicht feet b:Jov the a:ti.e fael rocion to li:.W.
deplution when not bei c used.
+
T*.<= drive me:henica c:n nove at a rntra of 30 to 120 ine! ea pc.-
minirte=, a: scicqte1 by the opera n. The detector can be aubstatically inecrted and th.a vit).dtr.vn f.*os the a:ti.e fue?.
+
region of the.co7e or.be ;onitione 1 ni a fixca lo::.tiha viUc.g
= -
the coro.
A control ced readout panel contain:
j record 1=Lthe. flux trace as.the detchtoa : trip ch.t-t re$or?e fo:-
- 1. ircerted au1. then 1 -
Withdraun frcri.the core. Tht: feature.nllov: a ccept.rfnen to bc
-~
nade batveert the standard CPLD :!E.t.12 and the, n: table detector an a function of core lifetJne.
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It al=g allow:
the fixed level:an evaluation to to cade cf flux Crndients between flux depression riue to fuel ens:. -tiy spiecr cri6s.cf a r.tanderd SP50 Th :sc c:cha--
ni:.ns hr..e been une:i cxtencirely at Cconce for evaluatir; CP; 3 and fuel perforcas:c.
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P3 cane excu 2 my delcy in providing the ab..7e Infor.tien.
A: prerion:17 j
nentioned,r;iy nornal dutica nu:t cosa before per:anut interest:.
If yon have any further cr tione, ple.ce do not he,ituta to contact me
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