ML20085B087

Small LOCA Info

ML20085B087
Person / Time
Site:	Crane
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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s:

.t

=.R SMALt.' BE!"A.".S *:T"'W'* AQ CARY T s

. 6t

,J 1 *.,

ET*:'A T1

? ?

Q

'There are three ' basic classe L

aus111sry feed.ater.

s of break response for musil b

. s

, ~:o Thesepres reaks withouc a g.,

a II. These breaks capable of relie i

. h,/

seL:.:!.

-, ;.lj o

v 3reaks/tha. t relieve decay hng all decay heat via the break

.,. y*..

~..w ead with both the EFI injection a=d

~ _ ;...:.c, w*.

~ 5ber bre,ak',.. G,

^

q.

.. G

.,o.

via 3.

Breaks *which do not accesaci

-.f3.f

ca12, syst7rerepressurization.

actuate the EFI and result in

.*; u

.r

~.3

..,j The systeur pressure graasient jf

-Q, For Class 1, it is s for these breaks are depicted i seen that the Ec n Figure 3.

throughout the transient system pressure dircreases rather

? o.

and LPI injection vill probablyFor the, larger btraks in this y

smoothly Dj

=

a class. CFT actu.stfou occur.

only. CTr actuation will occur For the smaller breaks of thi y

for the short term stabilisati Auxiliary feedvatar " injection i s class 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 With the EPIs e2

.n.

be established coincident with a slow systen depressurizatian s-ill AS trip lq

~.]I tion la expected.

the decrease in care decay h Auxiliary feedvster is not No CFT actua-eat.

stabilization of these breaks necessary for the short term Antonatic ESTAS actuation vill

^

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

,q, as the break is not capable ofs boiled off, system repressuriza i Cace the t on will occur 7

Systes repressucitation to thremoving all the decay hea the core.

4 generated in

\\

velves will occur for smaller b e FORT or the pressurizer safety

,a reaks la this class.

case, repressurication to the PDFV a1 d e the ":cro" break

~ :'

will occur in the first F,'trhf O f.; L*,...~. ' 7: ' s "9*,.

tes a,.Operat,g,r

.,s

' ~ ~ ~ ~ ~ '

^ 7 ;.-

. n.. '.7.. =,..

MT

-.c

.S

]

0

,y

^M

'1 3

- -

• 1 y.: %. % -

Q,f 9 a 9 '3 ;c

=

. - :s 3

J w

~

w.... -

't

~ ~ *. ~ - - -

• ~ ~ ~ '

• ~

p-.

..=---

e

- w-

...,- r. 9.

'., Y.'.

f.,

2-7

~

(

~ t:':::.

_:i

. }.

5 J

t g

act. ion is j,

required within the first 20 a

C...

~ i.3,,..

• t.

out the transient.

For the 177-TA lowered lminutes either era;;e through-manual actuation est1h31ahment of auxilithe auxiliary fe

. J*

of The c.an ba

. a.1 v

/ -}y.-

to the ESTAS actuaticary feedvater vill rapidler syste M

RCS es..

secondary side SG pressa pressure, and sys y depressurize the J>

either the

~

l gd;

,s.

ssure vill stabill:e at

.r..h the la'ak rate.

ure or at a pressure where th

'r s

"j For the Davis-Resse pla e EFI equals.

.s ?

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

~ 3 f."'

the itcreased ir. venteater than 20 caaures (p operator action is 4,.

..-N$.'

actor w e l.

ory in the loops that is robably I.0 ninutes) due to e

However, due to the lov available to drain into th i-operator rg,s,t, establish auxiliary feedwater inshutoff head e re-4.'

Pressuriter level respon

'".I,

ystem, the similar to that depicted f se for the first two clasorder to depres m

.;-jf CS.

.\\

or Case 1 and 2 of breaks will be ses section.

For the Class 3 breaks breaks discussed in the

,,, j.

Sa T!gure 4.

4 break and is shownThe minimum refill time f, pressu previous J

ill be as shown or the pressurizer is that f on Tigure 4

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

j.,

n auxiliary feedwater has b urizer levs*.cause th n'

atore o

Or :e the opetator actic result la een taken, the

' T eutaufge from the pre'ssuri systen depressurization will o to re s,

of pressurizer level.

For the zer, probably resulting l

.. s system repressurization f ll smaller breaks aa couplete loss of class 3 which results l I

o level vill increase and th actuation of the MPI syste owing the 3

a a.

t en stabilize.

Without auxiliary' feed m, pressurizar.

will saturate early in the uster, both the jgt leg sa turated.

transient and, for the Cl and e,oJ]d, leg ' temp remain g*s For the Class 3 breaks ass 1 and 2 breaks, will

.Q

?y,-

, once auxiliary feedwa.

. - l.

, -S g

ter'is estah.ished k

.q

- y' 2

'e

~~.

• • - ' g ~ -"=*

. - '1 I

g-

~

y

'~

e*

~

C y., ;;

~***""{

e*

• =.

M e

y,..,,

-,=

p.

--) d. O G 6 },

,o 9 5 c.

- ' ~ ~

. c.-

.y: *

+f.

, s:..:.p.:-

g 4.;

~-

y

.w-.

• m;;d j5=..y...;

. v.,..:.m 3.. ;

~

E~

A ~.~.----.-.+.

,l m.

\\

1

.w...

=.

..::.. w d

/-

8 j.

• C

y,'

.* e cold 1** Ce:peratures will rapid 1 d

kg, C W erature correspondinZ to the SG seco sid there thr'oughout the re:mainder of the tracs'

eng, g,g y

+-,,

. r=ia saturated throughout the event.

• ). ].* 8.?

, v.

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... N l

.- E

.. _.J.

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3...

.= m,.,

c.

. x s,

y

~

g.

... s.

y,,

.m

.o g

.m 1

q 4

1 e

=

7

~......

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r.

- c,

. 'l '.

e.i.

g m

e 4

.i e

.M.

g

=

g

c..

T

.t.

.s

==

4

~.

6 L.j.

F

~.

a t

t 4.e i

a 4-c CNFOE.UlAL

[.

1

. O

. s.:

.c (way mwn=y g -

7..

y:

. i..

[.

. f

~

y.

U. - ~ -

~c...

F'***/<

..w

....y..a.'.=.,.-~.~-1 i,.** ~

,~

m'

-.I V

. 't O L

• ?

f'

• / / *>

C.

y

..-w..=.

w l=

. i 4, 7..'.

s.

e epga e e * *

..,,,y,

-.p,. _

m_%g

.g e,,,

____-.-g

,.__.7-,

__-mg-_

w-I-

. n.

"--[

e g

4 g

.y*

=

'r.

s

~

r

.SNAf f. B t.E.O*.S"l FE5 sT.TZE'

, c 4

The system pressure transient for a small break in the pressurizer will 1

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.

~

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

~

I the pressurizer.

Tlashing vill ultimately occur in the hot leg piping causing

• d 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.

Ecwver, the indicated level vill show that the pressurizer 1

is only partially full '

4 J

d

~,

~... * -

~

w..

..,i;

.2 -

~4 i

m

g

[-

~

.I

'g e.

n 1

• 5 e

~/.

~

. 4

,r e

b L,. M.% p gp, y

. w n.,

l 4

1 f

,t l

~

_/

7M a e

O g

no.

h ogg; F

tur

.r...

t g.:.g : :-..

u......

e,.

,.-.-..,.....-.a..

v

-r-

.. ~.

• M.L S *.:. = '

s.ww..

,e

~....,c,

,.. =.

s.

c

_1

-_m.

_,..M

.._so.

, gp b

.= m

....=.

e 3....

.e.

../.......

4

....m-.

,.9

.e

. a...

4..-.....,

e

. g..

b

.g s.

..g,.

. fo o e...

.g e

.1 6

f

..s..

..a

....--t......

,n

.~.....

%e. * =.:..

L-s

... ~..

~.

. 2

.;.' I

.s

s. i s s

.. s i

f.

e

...c

• ?

1

... e n

..2-u, J

I c...

f

(.

..o Fur uRE

.5

E 3

. [

C.

- e so..

PREssug ozFr? LEVEL Vr TME

{

c

.~

.,g -

- r 7

. et FoR

.SM At. t. G R EM' D/

au u

PREstuRiaCK

~

z. u u

u.

e s.

n.

..y-..

25 e.

.p n

p...

..s.

..a ra

.s,

u..

3..

u o

-..V

.n.

.o

... yo ano s'w tea sue i

...u h.:

.. 7 oMr

rec

. *... T.! v. m.'.5-i'

.4 c.

=

t.

g

.- ~......

I ' '

~

.. -... ;=,,... -.

s.

.i r'

Q

.t,..

.G.

\\,

\\,

r.,,..

4 1

,o s..

. u.

=a w..

pm.,

.M.WN

+..e.h.,

" " =. * -

g.

-w 7 -

..-~- -

Am-w-,_...

.-g 1

-.. - z

_- s We 1

Babcock & Wilcox C *? *.

~

~,.

• C<

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

c too small in conhination with the operating IIPI to depressurize the KCS m

The d

steam Cenerators are being relied upon to remove a p.ortion of core decay heat

' -W If the reactor coolant pumps are not operating, and the pressure has stabilized

. Y

~~-

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

~ -

-- ~~

• * * - ~ " *

~.-

ng again as the decay heat level decreases.

i

..N If the Itc pumps are ore--P' L ?ressure may, or ::ay not decrease, it could eventually increase to some the EP1 refill and repressurize the RCS.

stable level as

. *b

~

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.

The hot leg te=pera-J ture quickly falls to the saturated te=sersture of the pri=ary s.

secondary side and controls ystes pressure at saturation.

The cold leg te=perature re= sins s1fghtly 1

subcooled.

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

l'

~

.}

more beco=e subcooled.

ence

{

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

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

- t e.

1

{

,e-S l

r..}~.

• 'l i

e d

f S

e W

f l4

.]

g

)

t g

l r

b.

+

=

.*[

I e, ----

. =.. _

.L

.g j

g W

f._

..n.

s i

,...-*.,o

_ e

~

I k

f=

~

f

,.. ~ '

s 7,,. 9.

y

.p

.w.-

49.

'W--bW a-

,-w---

m r~

e -"***Y. 0 2

.* '.}r'.-

~~

~E s

H

,.y.

z_3 s

~

...N Babcock & Wdcox

,.a g

.f

~

}.yg i

'.' ~.:3

'*"-~""*

s

(

j l

.a

• = i Curve 4 of Figure 1 show

. 5'> f.>.0 _.s, n

/L.

\\,,,_,_,,,

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

- [-

~

een lost and the break is Egg reak in whic

.s.

with the RFI av'a nable to dep

~

~

k~

. Q_

r feedvater is available %ressuriae the primary

.,.sg R in cochination

.; i gen.

. l.o.ss of primary system coolant ev Although auxiliary a.**

terru

-B.

r

%ptionof cirealation I

• essurization around the loop.

entually lesds to in-pr the. primary system.

This la fonowed by a gradual of e

that the primary system Although not likely, it is co l-r_e,

q Ccte ttevalves before the pressurecould repressurize as high as nceivable

~2 i

Figure 4 stabilizes.

e pressurizer safety Coce enough inventory has b This is shown by the dash ps g.

direct steam condensation in th een lost from the prinary syst me in j,,

M,,,,,,

secondary side e region of the stess ge.erato em to allow

. a-coolant.

,. { """.".

the primary system down t the steam condensation forc rs adjacent to the saturation pr, essure es a depressurisation of o the since the cooling capabilities of the secondary side.

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

sufficient to czeeed boil off iot fan below.tt at on t

.m e

to remove' n ary side, removes decay heat energy from thn the core. andcondensation EFI is stabic condition e systes.

steam generators and it will remain there until thThe reactor ecolant system action.

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

'l 2 during the depressurization s chsracterized by curve 3 of Ti 1

s.,

repressurization phase. The dashed 11, and Curve 4 of aigur 1

gure

~*

.-T.

. temporary is forced up to the pressurizer saf taeindicates the level behavio

~

bot le e y valve setpoint.

pressure

~g temperature win rapidly approach saturati During this transient,*

depressurization and it win with the initial system on 4.

m

. remain saturated during the whole t leg tempera.ture viu approach s atur ransient. Cold

-slightly subcooled durins' the re'

.at. ion as. circulation is lost, but may re 4

direct steam condensation devel pressurization phase of the tra 3,

main m

g ee l b..

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

, RC3 depressurization

~~ures to quickly reach saturation.

Colkl eg 7.

t..

y 1

,y-

- ~

~.,.

....m=..

C r

A

\\

Q o "b 7

^

.. e _--

q p p. 9

>vsu

..u.-

. A g-s w-3w-a-

-a--

g-ygy w,-.m9

-yy

.n---.----m,,.g-,g

-.we-r-e re----w=.-F---

e mivmi.---

s'-

.w.e--w

• --e.e-

---

gr--w-w---

.=

s c-u.

4 Babccck i

L Wilcox j.

~

ande_

'S ter:peratures.____________

may once a _. _ _ _ _ _ _ _. _ _ _

cre

-~

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

~~

ure.

primary systes has

' ~-

may cause temporary int Subsequent filling of stabilizec

_7 as the primary side lev lerruption of steam the primary systen b q-ytessurization rises above the condensation in the staa y the KPI

~

e n generator secondary side level capability of decoy heat, the break and If the de-the primary system will the EFI is insuffici

,t coolmat is lost sat to once more offset

~ ' ~ ~

to

.3 this potat the primaallow direct steam repressurize

~

.,d pressore.

ry system will oncecondensation in the until eno u

steam generator.

This

.a decay haat or thecyclic behavior will stopagain depressurize to s

.At su.o.dary side

~

operator takes once the E?I and break c 1

~~

1 Curve 3 of Figure 1 sh some action.

an balance i

BC punps are lost, but which ows the behavior of PCS 1

does pressure to

~

tion.

The high pressure injectnot Icad to interruption of a break in which

~

1 the pressurizer has ion is available a d natual circula emptied.

n cirem14 tion to the The primary system remainexceeds the leak flow

\\

.,W Figure 2 shovs' the pressteam generator removes c subcooled and natural ore 4

s

\\ _--*

system pressure.

suciter, sever ore decay heat.

As Curve 5 of empties and continues to

.i centrol primary 4,

.._q.

,... m ~

3-

.)p. _

-

• _~

t

= = = = = =. = * =. =.

y y

==~~

~\\

. _ ~.

~

I

,.i mme

__n. (5,.,..

.O ma.=.==

,.. w.

6 8

.9. - -

=

e

_ _ _ 6 :*),, C(l i., I p

t y

=

. <-~ ~.. _- - - -

__ _m_

1....

r g

~

4,...

-- s _

t

_..___.___*r

~~

t __

. = =. ',

~{. :1:...n

~p.,.

s.

.c.

. a.,

~

. g...,.

.... - - - - - - -. - ~ - -

__-._----A=

- - - -