ML20024C738

From kanterella
Jump to navigation Jump to search
Requests Clarification of BAW-10074A,Rev 1 Re Small Break LOCA Analysis.Clarification Should Address Inability of Very Small Breaks to Remove Decay Heat from RCS as Fast as Heat Generated in Core
ML20024C738
Person / Time
Site: Crane Constellation icon.png
Issue date: 12/06/1979
From: Michelson C
Advisory Committee on Reactor Safeguards
To:
BABCOCK & WILCOX CO.
References
TASK-07, TASK-7, TASK-GB GPU-0483, GPU-483, NUDOCS 8307130191
Download: ML20024C738 (6)
v • d • e


Text

('

^-[A' s

-T

' i5 N.

W t

,,~.

a et

.L-L.~ ' *f :, x,* /

}

a.

a s % '.

3 5

t s

,g s

m

.3.,.

a t

-j, eg.

s ys f.,*>

s s",I

'8 -

t

.~g

', t. g -,4 g,

3 i_

g

.N-

=

n. '3,.

u.*,

mv.~..:, <

e-Y e.* n; a g., ' s

,.'Qv~

,,,/.u' Mm

.., ! ;;f * * ;- +, ~. ; 9,, y t;.5 Le,. i + <. ".

'.:/.^

e-ep

.t',

u S L.. ^,;. c i: ",

cr.

..D3 3.,

g

  • ,',.6.s-4

+e t

4'-

,, ~ ;, f.

,'r,-. *>

i, y?.

4 p

=

c.,

6 e

-6, S.c. g : 7'.

s.pn z.,.:q'7 y x.

  • z ~ ';n.;.%',. p. u:, -:

y 1.J.*?, *., }."

), ; j.

7 l, s,.

-,f

  • fi < -

'w

, e

.,5 4 -

.gkg e <

g J 0,

, rf -

,. + y., 4, r A--

s

.g' e

+-...

,j :

4 y.'

e - n

-(

[

  • [,,,

4 t

g

,7. :+.,. D

..., -,.. ~..,..,

... v.;,

e, r... n -,

y~e Y. l.,..l.- lO

', { : :

3 g.

s s'.

,,,;,p. W..y,Q,.!, Y.,. p. 4, y,,L a. -s.,, :..: ;-, a y

- * ^

1*

_,,..e, t

". 1

?.1s.'c ; r % ';);,. A 'n, f' 4,'/,.'g+

w

~3: %. ~

' * - ',.. -3,'",';

...,,.c.5+,. 4' 4..

...Q s.

s,.,;,:-

4

f.,s 3:

s

,4e q

-=

m. * -

- g,..h

.3

,Q3 _..,-,..

3

  • C ' '

s.',,", # w" ; -,,.

s

's,f-A c

f., ~n % '.. ?.j.,.

g

- ? h.

,'.s'.' '1 r *Q '?:f.2.g,. % '.,'ls i ',f, 'W',l:

7 c.. "R.,.'. rM..'s...

7,,

w-

-1.t M ' -

?

2 L..,t i '.p g.-

,J,*.t, w s.Q.. :f..;,.W6. 5 V' ?."

W ~.t\\;'

l

.W'.,W, *4

. ',,,' / ** -J +s.:

7.; -

.a,.-

-3 e

..r

. N j,-4.,. ;.., s.., +.g- ';.

.e-

. y -

q,, L [, {

s. 1 4.

..jo.

..~>t N..,

4

' M,. '. p.,. @s.3, y

.>.., f.4

.sp4.'--

..,. < s,.

~ g

.o

.'*".p..

'

  • I 'm y~+

wI.

.,[#,

/sE*d ' #,

,,, +'

'F a,[

g a'

.y.-

.r

~

~d.

,+

,s 4

,,4.-,

,,..-3.7.,.1.

i

+

~

t

.A. % q -

  • g < *

<: ( g < '

~,

.1 ^

1 y

r

~ s ' ' ** ' k n

{ > 's.

s~

v

    • m' -, " '

l ; t-

.~6'f,'...

  1. 'g,

x

_e-Q,.s,.

r$

' '. qi r

o

, +

t m.,

? $ ' ? '

.g, b r

s.

..s._..

/ g,.' -

c I a,

,/. 4

,,. ". ',+

' ta t y ;* "p.*,k., '.

S+-..t*'-

.i s **u.

-.., gT'

.5 6

.., v ~f a q,

Y' :- c. -(. pA,1

  • .yr.g

.L e

  • s=

.,- /.s

. 6

-,f

. s ' n.. E S s.,:.**

s,..3.,.

+

g >,-;, 3 -

.,.s,

,...,wr "t6 e,

i e,.

.i g. -

.,.3

.~

s e

.. ', ' - *.,N o.,g,,,, ; ad,, - -

. n*

s

,,1e,

-.9..

e

._ s.p,-

c

.g~

(

i

..p ;,1

. * ', y e,v - ;,

s

-(-

r r

'.,6

, -^

4.

-3

+

s y

.,s..

. /,.,+*-

  • a

' A

.' " e

.4

+

.Q

..-g

'
  • y. 9. ;.

h.=--

3,

{

  • .g>

a :,., > ~.

.3,W s

.s

~,

e e <:

f

'; g.

, +.

.es s<

a

.r 6

i.;

. n. y - -.-

,s h

.a y

a.

g

  • b.

P

}

e k

~

+

.M

/s r

W

, g s

".1.

'A w

~

s x

s s -

e

?

g 4

I t

wI.3 mm(I

&C k

I 8307130191 791206 PDR ADOCK 05000289 P

HOL O

i g '. N -1.* ~'.*.' ' ' :.41Q.n-

~ T '.+; en w sw..,

E ti:

Ds' c. to,1971 j

r

~

~((bc fi {b t.t.0

. GFH m N1ra cat.

i 1 " ' " ' ** " " " *-

3k/nna.um r

With re6ard to the very small break LOCA analysis, the concem of iT i

N small bres2 expre=sedinletterNo.E-5C20centersontheuseofthegS When replyI=g model (BAW1CC7f4A, Rev.1) for breaks below about the

~

i i.

ymMm:

It is not clear that 3AW100716A accounts fbr the inability of very small breaks to remove decay heat from the reactor M ="*

Such 4amh414ty system as fast as it is generated in the core.can lead to a pressure which irgesses the fluid blowdown rate while r A"ad*! D the high pressure injection rate.of water inventory from the pr 4

would otherwise be predicted during blowdown.

I of &=4da'aing this effect would be a lower reactor vessel 1

water level fbr a longer period of time and a higher peak clad f'

tenperature if the core unewers.

The B&W small brent model does co2 sider heat transfer capabilitie frca the core to the coolant but does not appear to include heatFor b i

l transport capabilities out of the system.

0.05 f?, the heat reoval rate through the break will exceed the decay heat generation rate in the core and, therefore, heat However, if the transport need not be included in the model.sars model 2

not correctly or conservatively predict the LOCA' behavior becs:se it does not accou=t for the increase in reactor coolant system

(

pressure due to the 4~h"ity of the break to reeve all decay heat.

this problem wocid to to take A conservative approach to e d '4"!

credit only for that portion of the decay heat which can be reoved If credit is taken for heat re=cvel thrcmah the steam generators, then the questics of when natural cirenlation is through the break.

lost end how 2cng before the steam generators are available as

& ="aers must be considered.

d In every case, consideration should be given to the sustained pressure effects of reverse heat transfer in, the steam generators and the inplicatiens of treak isolation by autc=stic or oserator action during blowdown.

lihan replying to this statement, please indicate which portions of peur reply are based on analyses and indicate their-availability to TV the NRC.

X040180 1

1E e

i 8

l l

  • MNe
  • **---. men em4g 3-.

._,-__-,,p.__,.,.y--.--%--_,g-%

- m

.---------w-.,.--

9 Yblot.l $

~'

e aw r

I

' T ~. ~. ~

,%A*cg&

fu d.S VJ.__.

~

. o '.ZWa.m/

Jok..._............

I

4. !.. Ti, _ j n{_..,.. ^ % A rp

( ' % n. 1.<. - n brvL wne.r; o <. e .... --. jfqg AS Y f }/ c/ \\ ashA A &mo sf YM// k eir>rAoue /.,-m i 4- / j ~ $ _R. F .sr2 2 9 otor/2Yn m A m AM ./ WA/d/ ' df bid pd) /AAMJ-/svo7l'A As.e'; i y 1 d %sb Y U 8, #$ Y MN r / vy y.

  1. m M sk a r&M sddw A Y.

f / i .4%...., M W A,s..>./6. - y .v _N -(- { YJ5W A A A ff o* e c/ : / r/ i d2Zsd1 A A275$sh < h/#W b7l k&M N *'Zf465 ci ~ t N' Ahr &nd A!lin+V as Y i t 4 2 v.,+ d'n / e E8 ___ nd'h* d'M dilW EJY # 47 / dt.rdo, fAs at2 Me/ s &- aa:4r-d A / r F fU Myf- -?h ,M1d 'f-w1 f m6 ALarka 442,em y. Q - k w 3,.. ffe. m.---...*4 r itt Y ~ ~ ~ E E ~~_~. f - a w. te s. A r e % g 3~~ ( 8/1//9*79/J2o' f 1 W / W* N, } s r- // en w e-n e-Avz%ruww i ~._,-- --.- -,.,--. -..-..,.-,._.-..-.~,.-_..-_

m .4 ..... ~ l fusamtgeWS3 FFt ,\\. + .,(. &&i de su/hM..p6wn 16ad+x. r U fA ' ^

  • mf/ A sA

, 4- / ~ / ~' ' <d/sf arse 6f.4 s /m Aeh m. ( // ~ ~ L

  1. A Ace,#',61 s.6etw swM,/R t

A B a m 4%sfn .dadw Aced c&/ k.sk d i y A: & rs m. c 14 82/.o awf dwd A i 2 1 sf 2$<~ 4, n,.i> M dws wL i. A.Ar AMs w M A% &e& / Jar'-Aa / M seser.e d-M b.ref.Jows.37 l 1 FC / i mead <ZZ;, su/~/d /A w. St y s h* O.? f

  • fY J._

6 91 L AA y 4hY UW "*" [ -:"' M, b.[ K. & f m d & ( [ ,e I a. 'XO40536

  • / * *~ --* -

f tynw.%%w * !..w.- "~ g t l e. m.e A-sh'. a,w&A2.7 no- .j.,4s ,a-gg- //4--~ g3;;/- s.3s- #j.# # j; / u 4:g ,j, ;. J f l

f, f,g / < 4 Wk~{SA g,,,-(r, m a s n & 4

? ^ 1 ,g/ s m d A ",": = ,,,4 4A 1 / [ spl fA fW N##'^ # ,/&, Ad p. 1 -y,j"gg m A

  • Ale

.17 er g. ,,,,,.f4,,,,, - a.d_,t, f_ A.dr <#. d ,,,3 4 ]$y,1,2+, AIG_Acgv j Q g g $ h e 4. ^ j y,,A s 26 f .A A J ^*="I? #9 / M W or m m, M *,y rg " ; s a x,; j g g g i a,& r d: e t +.. s A d. d .... e. h -f C= = ' h - # " Toe AveE537 a ,,,..%..w-eo e -v----- -- - - - -er y --ie...ye,..,e...w---e,-,=----, -c,.,,,ww.-ww,--wa-...w m...---, .-.,---e.--_--- .ww---mew-me+-mv--w-e ww.,----ww__ ,----w, --,--w----ww--

t ~ - + i.., e.ee-em-I esu**wne---.--. ##. .j 84TS _geeogste . A m v' em 4M4 c/ e n M n_ A n.'l L_,J A_ u_ ss w a a, ~ 1_ e i WW W/ 1 N M t A A^ _ f. ^ " ~. l(. AA' nfe&h 4%

  1. +4aw m2 s-r

/ Cas d /. ) hmad a N 'l #*"f_"'. W I$'A " A^?'( c ee G ./ YA gar $1 Mr as.* ee

    • e e4 e * *e m

e*4* G e G X04U538 Aeg; __.__._.._.,,.-_,m._mr_,____.__,-,...-._._,,,__..____,__,_._.,,_. _ _ _ _ _. _ _ _. _ - _,, _. _ _}}

Retrieved from "https://kanterella.com/w/index.php?title=ML20024C738&oldid=4626923"