ML20085B087

Small LOCA Info

ML20085B087
Person / Time
Site:	Three Mile Island
Issue date:	06/17/1982
From:	BABCOCK & WILCOX CO.
To:
References
TASK-*, TASK-GB GPU-0555, GPU-555, NUDOCS 8307070498
Download: ML20085B087 (21)

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Q .

s . 'There are three ' basic classe

~:o aus111sry feed.ater. s of break response for musil b L

Thesepres reaks withouc

., a a g ., .

. h,/ . ,

. . . .. . .. . . seII.

L:.:!.

These ,. . breaks capable of relie i v

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o . , .

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~..wq. - -t relieve decay hng all decay heat via the break 3reaks/tha.

~ _ ;.. .: .c, w*. . *

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- ~ 5ber bre,ak',.. G , ead with both the EFI injection a=d

.. G

.,o .

• via

3. .

- .f3 .f * .

, Breaks *which do not ca12, accesaci .

.*; u .

.. syst7rerepressurization.

~ .r .

• actuate the EFI and result in

.3 ", ,

..,j . , .

jf .

The systeur pressure graasient

-Q, For Class 1, it is

.* , s for these breaks are depicted i seen that the Ec n Figure 3.

? o. throughout the transient . system pressure dircreases rather y

Dj smoothly

, a

=

and LPI injection vill probablyFor the , larger btraks in this occur. class. CFT actu.stfou

, y only. CTr actuation will occur For the smaller breaks of thi s class for the short term stabilisati Auxiliary feedvatar " injection i

~

on of these breaks. ~ s not necessary ,.

For Class 2 breaks. the RC pr j signal'(s2 to 3 mia). essure will rapidly reach the EST

.n. With the EPIs e2 AS trip

. lq '

be established coincident with a slow systen depressurizatian s-ill

~ .]I tion la expected. the decrease in care decay h

,. .' eat.

Auxiliary feedvster is not No CFT actua-

. stabilization of these breaks necessary for the ,

' short term

^

Antonatic ESTAS actuation vill .

,q, SC secondary side' inventory i not oscur for Class 3 breaks.

. Cace the as the break is not capable ofs boiled off, system repressuriza i 7

the core. t on will occur

\

4 Systes repressucitation to thremoving generated allinthe decay hea .

,a velves will occur for smallere FORT b or the pressurizer safety a1 reaks la this class.

, . case, repressurication to the .

PDFV d e the ":cro" break "9* ,.

~ :'

will occur in the first F,'trhf O f.; L*, . ..~ . ' 7: ' s .

tes a,.Operat,g,r ,

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• g act. ion is a

C... .

~ i.3 ,,.. *t. required within the first 20 .

- out the transient. .

either manual actuationof For the 177-TA lowered lminutes era;;e through-

. J* '

The M . a.1

/ -}y.-

v RCS est1h31ahment of auxilithe auxiliary - c.an ba fe to the ESTAS actuatic ary feedvater vill rapidler es.. -

syste

~

gd; J>l,s .

• either the secondary sideureSG pressa pressure, and sys y depressurize the

.r..h

'r s , the la'ak .:. rate. ssure vill stabill:e at

"j

' or at a pressure where th e EFI equals .

.s ?

e

. For the Davis-Resse pla .

y accessery at some time gr nts (raired loop design)

~ 3 f."' operator action is 4, .

the itcreased ir. venteater than 20 caaures (p actor w ee l. ory in the loops that is robably I.0 ninutes) due to

..-N$.' ,

operator However, due to the lov i- available to drain into e re-th 4.'

'".I m ,

rg,s,t, establish auxiliary feedwater ystem, inshutoff the head Pressuriter level respon similar to that depicted f se for the first two clasorder to CS. depres

.;-jf

.\ ,

ses

. section. .

or Case 1 and 2 of breaks will be

, ,, j . Sa T!gure 4. For the Class 3 breaks breaks discussedprevious in the J*

break and is shownThe minimum refill time f, pressu ill be as shown 4 .

on Tigure 4 or the pressurizer is that f pressurizer, the

.y, or the " sero" sacrease, possibly to full presssystem p

, j. ,

nventory from the n'

atore n

auxiliary feedwater hasOrb:e urizer the opetator actic

. levs*.cause o the T

s, result la een taken, the o to re ,

eutaufge from the pre'ssuri systen depressurization will .

- of pressurizer level.

.. s For the - zer, probably resultingaa l .

system repressurization fsmaller ll breaks couplete loss -

.'-- o I owing the of class 3 which results l 3

level vill increaseenand

• th actuation of the MPI syste a a.

. t stabilize. .

m, pressurizar .

Without auxiliary' feed .

will saturate early in the uster, both the jgt leg ,

remain transient and, for the Cl and e,oJ]d, leg ' temp g*s .

sa turated.

.Q

?y , - For the Class 3 breaks ass 1 and 2 breaks, will

, -S .

- - , once auxiliary feedwa. .

. -.# l .

• g k -

- y' ,

.q ter'is estah.ished 2

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4 1

The system pressure transient for a small break in the pressurizer will -

behave in a simil.ar manner to that previously discussed. The initial depres-aurization, however. vill be more rapid due to staan relief out the break. .

.. The pressurizer level response' for these accidents vill initially behave -

like a very sr.all break without auxiliary feedwater. As shown on rigure 5, an s

u - initial rise in pressurizer level vill occur doe to the pressure reduction in the pressuriser and the subsequent insurge into the pressurizer from the RCS. ~

I Once the reactor trips, systes contraction results in a decreasing level in ~

, the pressurizer. ,

• d Tlashing vill ultimately occur in the hot leg piping causing i! a an insurge into the pressuri:ce a:.d vill rapidly fill the pressuri:er. For  :- .

?

the remainder of the transient, the pressurizer vill re= sin solid". Towards .-

"'j the later stages of the transient, the pressuri:er vill be filled by a two-j phase cinture.

1 Ecwver, the indicated level vill show that the pressurizer

'; is only partially full ' .

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d Curve 3 cf Tigure 1 abovs the pressure transient for a break which is .

c m too small in conhination with the operating IIPI to depressurize the KCS. The d steam Cenerators are being relied upon to remove a p.ortion of core decay heat .

. Y If the reactor coolant pumps are not operating, and the pressure has stabilized

' -W ._

.. . . .- - ~~-

~ -

-- ~~ ***-~"*

wear the secondary side pressure. EC; pressure may eventually begin falli

~

ng i

.N again as the decay heat level decreases.

If the Itc pumps are ore--P' L ?ressure may, or ::ay not .decrease, it could eventually increase to some -

stable level as

. *b the EP1 refill and repressurize the RCS. ~

.- The assur.ption for this case is that seccedary cooling is caintained. Curv,e 3 of Figure 2 shows pressuri:er behavior.

_ Curve 6 of Tigure 2 shows refilling by the KPI.

J The hot leg te=pera-

. ture quickly falls to the saturated te=sersture of the .

_ pri=ary s. secondary side and controls

- ystes pressure at saturation.

1 --- -

subcooled. The cold leg te=perature re= sins s1fghtly .

l'

~

- If the E?T refill _and renressurf te the RCS. the hot legs can - _

ence

.} more beco=e subcooled. {

N The operator needs esly to verify ESTAS actions and, if  :

f- . . . . . - EC pumps .---- have not . failed, leave one rur. sing iasch loop.

e.

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- Curve 4 of Figure 1 show .

. 5'> /L. f.>.0 _.s,

\,,,_,_,,, _ -

- [- ~

setor coolant pu=ps have b s the behavior of a sman . -

b-

.s .

k~ . -- ' with the RFI av'a nable .

een ~

to lost depand the break.,.sg is Egg reak in whic

~

.; i R in cochination r feedvater is available %ressuriae the primarygen. - -

. Q_

a.** . ,

terru . l.o.ss of primary system coolant Although ev auxiliary

-B . r

%ptionof cirealation

• .. pr around the loop. entually lesds to in-I

.. *essurization of e the. primary system. This la fonowed by a gradual

, l- that the primary system r_e ,

q Although not likely, it is co

~2 Ccte ttevalves before the pressurecould repressurizenceivable as high as i Figure 4 stabilizes. e pressurizer safety ps

g. Coce enough inventory has b This is shown by methe in dash j ,, direct steam condensation een in lostth from the prinary syst M ,,,,,, secondary side em to allow a- coolant. e region of the stess ge.erato rs adjacent to the

• the primary systemo down the t the steam condensation forc

, . { """.". . saturation pr, essure es a depressurisation of since the cooling capabilities of the secondary side.

d ---- decay heat, pressure will n of the secondary side are need d

.m e to remove'

,; sufficient to czeeed boil off iot fan n ary

' below.tt side, EFI isat on t removes decay heat energy from thn the core. andcondensation stabic condition e systes. steam generators action. and it will remain there until thThe reactor ecolant na system

'l -

The pressurf ter level transient i e oper'acer takes further 1

s .,

- 2 during the depressurization s chsracterized by curve 3 of Ti 1 ~* gure

. .. .-T. repressurization phase. The dashed 11, and .Curve temporary 4 of aigur

-' ~

is forced up to the pressurizer saf taeindicates the pressure level behavio

.. - - bot le .

e y valve setpoint.

~g temperature win rapidly approach on

. saturati During this transient,*

• depressurization and it win 4 .

with the initial system m

leg tempera.ture viu approach . remain s saturated during the whole t ,

atur ransient. Cold

-slightly subcooled durins' the re'ion as. circulation is lost, but -

3,

.at. main may re 4

. direct steam condensation devel - pressurization phase m of the

.' g tra ee l b . .

will cause the cold leg te=peratops in the steam generator

.. . . , RC3 depressurization .

'- ~~ures to quickly _ reach saturation. ,

._ Colkl eg y 7.

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Babccck j. ~  %

i L Wilcox ande_ &

'S ter:peratures.____________

may once crea _ . _ _ _ _ _ _ _ . _ _ _

-~ ~~ at secondary side press subcoef sligh Ly.oece the_ _ _ . _ .J._ . _ _

' ~- ure.

primary systes has

_7 may cause temporary int Subsequent filling of.

stabilizec q- the primary systen b

~ as the primary side e lev lerruption of steam y the KPI rises above the condensation in the staa

.' ytessurization n generator capability of .

secondary side level .

_. decoy heat, the break and If the de-

,t the primary system will coolmat is lost the EFI is insuffici sat to

~ ~'~~ to once more repressurize offset this potat the primaallow direct steam u

.,d

.3 _

pressore. ry system will oncecondensation steam generator.

in the until eno This s

.. .At

.a' .

1<

~

~~

decay haat or thecyclic behavior will stopagain su.o.dary

. depressurize side to

_ operator takes 1

some action. once the E?I andanbreak balance c

i

--- Curve 3 of Figure 1 sh ,

1 BC punps . . ,

are lost, but which ows the behaviorpressure . . of PCS to

~

~

. tion. does The high pressure inject not Icad to interruption of a break in which 1

the pressurizer has natual circula emptied. ion is availablen a d

\

.,W 4

cirem14 tion to the The primary system s remainexceeds ore the leak flow

\ _--*

Figure 2 shovs' the pressteam generator, ore decay heat.

removes and subcooled c natural system pressure. suciter, sever

.i ,- As Curve 5 of

, empties and continues to 4,

centrol primary

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