ML19224B830

Discusses Michelson 790510 & 11 Comments at ACRS Meeting Re Break Analysis & Transient Sequences

ML19224B830
Person / Time
Site:	Crane
Issue date:	05/17/1979
From:	Heltemes C Office of Nuclear Reactor Regulation
To:	Ross D Office of Nuclear Reactor Regulation
References
NUDOCS 7906270022
Download: ML19224B830 (13)

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UNITED STATES I

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\\,,',',. 8 MAY l? 1979 l

NOTE TO:

D. Ross

SUBJECT:

MICHELSON COMMENTS RE: SMALL BREAK N Q YSIS y A RS MEETING (1)

During ACRS meetings on Thursday, May 10, Dr. Michelson pursued with W a number of transient sequences involving lower temperature water in pressurizer than in reactor loop.

The details of these transients and Michelson's concerns are marked on the attached meeting transcript. (Enclosure 1)

(2)

During the ACRS meeting on Friday, May 11, Dr. Michelson asked the staff to follcw-up on these sequences and concerns discussed with W, and to take the lead in assuring an independent check is made of the hydraulic models used, the effect on assuring natural circu-lation, the extent of appropriate test programs, etc. A positive commitment was given in this regard by Dr. R. Mattson.

(Enclosure 2)

Dr. Michelson also offered his help to the staff should any clarifica-tion or additional discussion be desirable in order to understand and address his concerns.

(3)

In private conversation, Dr. Michelson noted that W makes strong statements regarding the ability of their system to achieve natural circulation with no overpressure. At least, their analyses show there should be no problems - yet, when tests are conducted - there is usually a high degree of subcooling.

He suggested, in a rather serious tone, that '.{ should be requested to try a test without overpressure in the pZR, and to really validate their analysis.

He doubts that W would agree to such a test - yet it disturbs him greatly that they continue to take a strong position based upon their analysis.

He believed a test would provide some real insight into their system performance.

His reaction to the B&W small break analysis was favorable based upon a quick look. He believed that the scope was good.

He urged that the staff, of course, dig into it to confirm the models - and to determine if the new models verify the old ones.

His conclusion was that we are probably now overacting to the small break problem - but, with good

cause, ne fi emes 254 1})

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R. Mattson A. Thadui E. Case T. Novak Z.Rosztoczy 7906270C hg Ef

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ef f e c ts ; hat you're Teferring to.

It sayS if I have any i

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.11 Both of tNose are exa ctly the same effect -- to 12 increase :h.e subcoolant that one ha s, T.axim.ze the del ta T.

12 So, co vi cu sly, if you open the pressurizer relief 14

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v. o u ' r e c.o i n c. to. educe pre ssur e. Ce pendin on the v

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c c,e r a c t e.-i s ti c s tha t you're at, you're going to take e coin:

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na; you we.e here and ><cu'.e goin-o c.c acwn, o k a v. ?

v 17 Eve n tua lly, you're c.oinc. to star losing some of 18 your excess r.ead that you had.

19 G.

MICHELSON: Yes.

I c~on't think that the r e 's anv.

20 doubt tha; you start to fla sh uhe ho. portion of the system.

21

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no: a small LOCA cue s ti on. Anc I'm no real sa tisfied -

ayce

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you'c h an s to enswer it l a te. on or some thing.

t Su: I think that sooner or later, one needs to have 9

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15 MR. MICHELSON: I didn't give you one.

You tola me 19 I had'cne.

(,augnter.)

eu 21

'!R. MI CHELSD.N : I asked v.ou :o cec.in with, a: e there.

22 any transients that empty the pre ssuri zer, and you said yes.

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c You're~ not refilling the pressurizer.

.An d this is 7

a time plot, if you woula, he r e. Anc his has all the safety 8

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You're not filling the presserizer 9

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i3 lMy c,ue s tion re ally again s si. ply, are we de pe ndi ng 14 upon natural circulation to k eep the primary site out of

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Iv I :ning tn.e answe.-

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MICHELSON:

1.'.y c. u e s t i o n. s :

How dc we c.e: 1:

19 s ti rrec up anc wnat oo we do for this firs: --,I don't :now 4L 17..

10,s a Dinu te or Wo minutes or whatever.

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ic 22 M ?. MICHEL SC:!: /' h a ; are we acing up to 20 minutes

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2

~

3.

.c v

.1 I pl a n t c'o Wn.

12 MR. M I CH EL S0:,' : Eu t I've got to

-'ve

.n e water from 1,

..w. e. vc o.

o. n.e S :. c.,

,m1e.

2--

w o.-.,,

w,.... 4 4 2,,.

6 u

i j-

--v.

l.

.,D.

C T.,

D.

.a

~ ' " 'v U ^3.. ' 'v' 'i. ' h. A' -*

t4 1..

-.r,.... c '. a' 2

-.."j -

='

... ~..

wii.

v

-i

%' i l0

.".,.O*_C',

.e. '* o " y".4 n ' O c~ ~e.">'.I L.4," '.. L'.I.2 ~ 2'I 00.

~

v s

r 3

v -

i lo

..o v.

=.- =. '/ o u

.n 1 C.

"I., :

_.1.. a s '.=.

Ha

,,.s..

.u

- ' a =. c.q.

.as.

m---

17

. =. = r.i n a c- - L. c,1

c..i.

u' ) = s.< -., rJ n., :- -

,y : C

.:c 4.

.. v.

o.

s w

o s

I 16 VO. STEITLER: I nave the subccOling tha

. s a va ilaole 1,

c 1. a.,

=-.m..

.=

--;..i.y

.= = a 1A u c, e-

=.... - n =.- 2 o....u. z - :

~an

=-

..y, 9-30

.oAI

'. s.

q*a2

. w - -.=i s mm 7-ev y.n a c.o vv.

wt i

s 2.ag

,me

~..,

> { -l ( ' '.

j

-. s i r.

?

< > ), [;-[ }. $ r,'4.

e f *.

)* k Q}

44

[

)

=

0 4

f..s 'i

.A.7 f$lI t

q.u t y.,,;, N b -

6

+

< l sg f 4

. t,s o.

. '. ~

L

.rg

. 4. g -l q- )g;',.ii;.,g

y

-t."',

4, ',] i,,- { ! x '

s P. v 4

4'.

6

--c:

c{

du

. d.,L

. c s...... n. -.x L

ni hk e.-=..e, e.-.

,.-. -.. ~.

u

... - 9 So i can c,n-4

.,u,

.a-

.c-

-.,._=_g..

u

~

. %-.. -, y..,

.,, w 2

~. a - - ;.- - -r

- -.~.

..m.,

..R.

y e-

.n..-

2,,

s -.a v v

---

v

w m.,1

1.,

.= e e

,,e.,.

=.t, 0 --

C-o v... e - - - - ~

-- -.. = - <.

e

--o.

- e u--

v-

'~ )

G S,,,2.1 m. r

.o.

'-'h= 's c _ =---

q

. q...

1 --

s i.

. n.

3.i 2

,,3 m

3.-.,

. L. C.. -. S u u...

1.,

2.

e s3., -..---u--J a v,- ", o

---

"9

.u...

r. s s av*,

e LI 6

co1d

• awe.

'1' 0 t.'.

u= '- 'e<',

". ' '. " -,o -=s"-e-w1,

- =

- = = '.

s ------

..S' o

d 0

0 wi'-h water at' T above the core, at best.

Probably not that il x

C. O od.,

Now,

".qe v.ess"-

.e-

.%. _ a. n c ". e - - c = '.' _v

~ -

s

="

.i eg-..s l "'

contrcl of the situation.

. l

• t i

.. -,,,g-

~, _,

,,.,...s.

.ac.-vc

.,=--_=;,, On b}- g n g *-

s

. c.-

.-a s.

y 1

i

.I 4

Sir.

t136, 19

.i.t..o.

..T c. m. - -.3 C "

s L, w y.

s

=

.u e

3

-4.y c.., -.. r,w.. t_:

e-

.., = = - -.2. s -

s Ia

. o _-.

o.n. m u c,..

6,.),. o<-

.s n

2

-3

p. y a. 4 -.

2.) n - -.....c, u, t )

. a v

-vu

-n-

-.4.

.. = c t. _. s

..gs is just too slCW to regain ov,=rpressu$e.

, e.

up

.c 01,l u

7. :

aC, We Can nc.at

...ne system up with

'A---

wn-_.

c., -

c,vy v ;._-m,s-...c=-2..

s 0 c =__. _

,2

.i_c

= -.o ec

~ -.

.'d.R. MIC ELSCN:

But we are not talking about those m

._ m,

f ~

s..

t, y

_ t. De,

.incs c:

n,

- t

. a.

s 2

t

-..O..

Y V -.O -.1 5 '

. A C., b s

• O a

-o.

s

-m 214,. 4 B

. 2 i m.n.

C3 s -.m.

V w 2.,. f w.

i v

-..t-y

.3 = C _ _5 r.. o.,.r - _ -.

p, t 3 *-,, c..g c., 3 =-.

3 v

+u-v-v t ",

. m.,., :-- -.

,e..,

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-v

-_a

_2...y___-_.-

.w. a.:

a 3

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_r

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. - - -, - = w, e.

: 2 v

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~

5

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s..

c - ?. c r

r.=,

= _.=-

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-,..=_. _ = -..=- =.-: __ _-.

~ ~

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-o_

a=-

-- -.. -.". s-MO..

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4,-

,-- c v. - c.- ----

-v-

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_w

.o _

y cac..

s-C..,

C..

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s. -

., w C _' ;.. y-*

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- = u _4 _7 2. '.7 o.

2,.s 4

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C " 's- ^ o ' '."4 C.

W.".=- ' a S

o "t M.R.

C. C R.7. 'mS C".s.

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/ [ ~-reSSure CCC'.ng *rCm?

i 3 !

-~~

- 01 CCWn

.M. R.

q 7. 7., _ h. y.,,.

nw=oSa u.'. e f - m.,.

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. u

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._., e, o.. c. c- __ C.,

. v.,

10 "

vu.

v.7 C'4.N, SONS -

~

u.= "i c "-

s'Cv'

' c y.- ". S --

x" - - u m'.'. _ ' _ ' =

11

--4e

'33 y o S 3 L, _ _4 2 -

_43 3 = _ u. _=

• 4,-. 7 - -.c.c. o g 4r y _- a g g n a i.

u k.. a._

a u.

• s l

12 700 c'a

_pog,

. '..m. u- -<.". C 'w

's.h...

.^ a W o_ _".

'o' 2

1. v^ '" -

• ="s" N.~ 2 ". 7" _' 2 3 ; ' _~ ^

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4...- k.. g 3,y d c_ 3. U57og3 ;r C o

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C a..-

n.

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14 W..u= "w ' s +.'7 a aCu

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h C "v

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y _m_s v a_. "- _4.. ;-..'. o o

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u 1

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ca i4

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,.,e

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C, A "_ '_ #.'. ";

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4

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@w<.oceu ma.:~.x m

254 Tm o

wwa

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= -

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.:...a

-m

~,

_...,. w

+ - -

r D~.

C.,..< = C.

u c = =- -..= - _.. =.. -- - =-

3

--..-===...,v>

.= -

. a.- -

4:

c<

c.,

--_, -- -.- a_ o,

s,,,___A

-v

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3 u.3..

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- + - - -

--...a

,-. s..

a-

- - -- ; C 'u'

......A L) a t

C '_ S.D l a.v e c. u.o there that We don,t

'.a'*e, anC We WOu3 C.

c'. e C O D '. e 5 0

1

.i 6.

of all of them.

)

l

.i S er : I m. u:.

1 a-

... d-e 4 %.,, o-o_

r

.411 uc.R.

u,. 2,<--12'Do

- i 4.

e w

. w

- --en-I 3,

now.

n..o.

.u... a 0u.

.v.-. Cn3 c-ca, 1 a

--., o.

,1 - - - -

.e--

u,

.y 10, couc.le of.coints that. came u.o earlier that tne Staff didn't

..I II

'. ave an answer to?

We made some telechc.e calls and we cot

'l l

,'i

._.,g-m

-..c 2.. o - e c

., m.

L w

nm O..n:

sure.

9

4 ;

.n., M.

.v 3..rr,S Cm...

1

o. 4 -.e. '..

v. -..

..n % s.-,a-..

.-a_ _ro_.

c_ -

c.

a w

1:

c '"uo l a. -

r' o -.' 'u s n -.. a.

a.' ' ' e..i.. '

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4 b

e

/C,

s. 'n c- _

h. s

'4

..C C s t_ #. -".c--

d Westinc. house had a DrcO.osal that the Staff hasn't acce.cted vet.

a.d we d: A.,. 8 w

u.3.. k., nA y......w. a_

_ O C...

..c- -.

.. 2.m. _

• C,,1 4-q., 0_ u ',.

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.a D.*.. C.'..Y.c u'"..'.'

=o-

.v. -.

..='ac.-

-- c o '.'. ':~

"s "

~

' c

.. _a.

- -.=.. '- - a c-the questions that you raised.

I wanted to be sure you '<new it, 2.,. d

0. 2,1 _1

.b.

v 8.

.C

1. .8""

,,Q._A,

• , --49,g._

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.=./..km.-

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If, hCWeVer, yOU need US back in the CCurse Of -P.e

.i.

o v e... 4.3 -

C"

'w C.~a C "" CW.'.. O.".'. i."g", D.Ie*Se ----

1. "ca

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3

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4.

'i One thinC I Cucht to mentiCn beCa Se it'S C Cr.e

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~~

3 We'his sche discussiCa' yesterday afternOCd"with ",~P 'E...

to you here.

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i

'n'a c ' 4.,c

~,5 c

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-a

-. no-C.,

n c. u. 3,. 1 C ; ~ C1.,.1 a-4 C..

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.-->Sr

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l,

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a"*' =

81.,.

<. = -.. = -**#

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9

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B

.d!

I fOr us.

'nd I'll ask Carl to either eXOlar it to yOU, 8

i 1

What we're CCnCerneC I

aOCut at the CC3ent, Cr S S k.V. C U to C9:

4 4 !

.n tCuch with hi.a quite soon.

l m

l 4e

.n o..

.A..s eu -.c. m.i-T u.k. 4, p..w. u, a.

C...... o, u. c y14sS O

s v

y

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a l.l 30

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r,. g V G.n.C' O a c.,. C r

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u u-1 p--.-.

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3 I,!

6' thev e c- - ~.he ac-a -

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7, 4Cm-

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c i

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t 7-4 31-4 k

e

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=- - -

v. -.. g

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1 n namu a C _v-";'.c-..'vn

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t c,

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(

'm e

--=_a c.m.

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c, u - a' ', _' C.".

C'~

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=

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ise t '

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u i

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=.

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y v _i.-'. -

i wa-

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~.a k i. i m w.,s wa

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"-C A.k. o e a...-

-o2 -,

-m I

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15 [\\ since we dCn't have a whole lot of tirne 20 get in:C it,

(

di

- 16 ';'

=..A

- ' u..t...k

'm.u c' o_ c.;..m.a. n,..

n 1-

- s e

e = '.1 ".. - -

wc

-.." ~-

c, o -

,t I7 L rather 100% to vou reCole.

I 3

I

.~

.'.,. c.\\ --:...~ ~

0;M. S I

_-DR, - M.A. TTS ON : - We have it. _

..w

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w

~

vg,. c

.7

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l '.' '

v 4

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,9 il DR.

Ce'. A' ' C "v -

e'.

n 'a'e e

a.4.".

- c s C. ' c.c - _4C.e m=.. v e,.. ^-

6 1-t e

e 1' l

- m 1

20 !!

would 1.ke to raise?

a a

j y=,ag3

~- f c.

-u~

- a a -.

R%.. - y yp.

e -.--;

-- O.,,.

..u.,..

s.-

.-..v.

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.-. =.-

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- __ =... ~. '. -.= __ m..

> = _

s,,-..

e

= r: -'

-~~=-

p

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n-s-

yr~--

u z.

2

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z 2.54 1

6 2

=.,

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