RBG-31324, Forwards Updated Info Re Util Licensing Activities.Effect of Drywell Temp Increase on Suppression Pool Hydrodynamics Can Be Addressed by Evaluating Effects on Peak Drywell Pressure

Forwards Updated Info Re Util Licensing Activities.Effect of Drywell Temp Increase on Suppression Pool Hydrodynamics Can Be Addressed by Evaluating Effects on Peak Drywell Pressure

ML20245H123
Person / Time
Site:	River Bend
Issue date:	08/04/1989
From:	Booker J GULF STATES UTILITIES CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
RBG-31324, NUDOCS 8908160321
Download: ML20245H123 (6)

Text

- _ _ _ - - _ _ _ _ _

..L:

4 i 1

.w

- GULF STATES . UTILITIES " COMPANY ,

RIVEft B4ND M Ah0N POM OFftCI box 220 - .5T FRAMP.NILLE Louls;AN A 70775 AREA CODE 6D4 ' ' ti4tiO94 3db 86bt

..I' - August' 4,1989 RBG- 31324 File No. G9.5,'G9.42 q

-U. S. Nuclear Regulatory Commission Document Control Desk-L

_ Washington, D.C. 20555 Gentlemen:

River Bend Station - Unit 1 Docket No. 50-458 This letter is provided to update the- NRC-Staff River Bend Station (RBS) Project Manager on Gulf States. Utilities Company's (GSU). Licensing . activities in-support of the RBS. The enclosed.

~

attachment provides' the currently _ identified non-outage related activities in order of their respective GSU priority. Should g activities or priorities change or require special attention, GSU will promptly notify you. t

l. .In response -to your request - identified 'during the review for L

Amendment 25, GSU has developed the information in Attachment II.

In summary, . the increase in temperature reduces the drywell air mass which in-turn results in lower peak drywel_l pressure and

. suppression pool loads. Further details are included in the attachment.

I Your support of previously completed activities and these upcoming activities is appreciated. If additional information is required, please contact Mr. L. A. England, Director-Nuclear Licensing, at (504) 381-4145.

1 i Sincerely, L 4 f.f.

FJ. E. Booker Manager-River Bend Oversight

, River Bend Nuclear Group JEB/ RJK ch I L,

Attachment AMI

(.

e=1 _

h 0

{

~ - - - _

h s hc 3 .N, .

r.

^

cc': U. S'..Nuclea'rRegulatory Commission

' Region IV 611 Ryan Plaza Drive, Suite 1000 ~

Arlington,TX7{011

'NRC Resident Inspector

. Post Office Box 1051 St. Francisville, LA 70775

.Mr. Walt A. Paulson

'RBS-Project Manager

Document Control Desk ~

Washington, D.C. 20555 A

'\

9 i

k i

k 1

.m_:____n._.2.__

s - , r

,t x

,! l

]9. !

Qfa &1 f 3

~

,a; e ~.?

)'

lB r

Y 2^

c' f" . -

n

?. .;e.

~ L;gE -

m .^

1 v

r Q3 N,* '?8/9  ;

R - .

s.?

i 3

/

E S

D m c

E 58- - -

T ,

9 -

9' ~

~

. C 8 9 8 0 0 xY E.

E P . 1

/ 8

/

/

2 ~~

9

/

9 g~ wP R 1

,X

.E 1 9 _

1 1~

/

1 ^

. W:=-

s

_ w p~

~ .

e - E ~' '

T

- TC

&2 ,

• IR MN t t .t 9 9 B , n' n n 8 8  :

e~

Q&~;. 1' .UO

- ST s~

e~

s -

_. s e /

8

/

8 d

%_:,.i Wt-GL= e~ . '

t n .

s~ ee s ~

e MV i

f o

gl na l ss rann ovoo t o n i

s y

.l~ an f i pi i o . l n s a ho .ust e tea JGu ,:

n'ti o '

n o i c' ci t

nqea oerc g) n6 ah n ita

- i n ei i' i a1 d

• u' t hr dd t sf h - aty

.l a ce od anii c8 rat _

.s s'

o s

c eb ma cahc n

8 he E

i

. T. bu we i Te p or stf u a U

Qri-

_ e . f f w

.dn' I' _ rt - e

.S i od io i l es

,? t r c) ns li th tt ut ET ' l o eI a l v s;t0 at nae .

I R. T A i p pS f ace usn ce nrh 1 te SI no jse4 iL att T"

N

. TS N

aR c l

( a ll t op cror em f ic fnt s _

~ -

E. ED: l - anpo r d idoo ci oor 3 M>MN DA S

U ga nc ca ilIt en sa fdlf i ae er pe sep mo f C N T '~rp i i n pS n n c vR Sn tdp o A EY A h I o es eteE e n u g..c T , MT T oo cn c' ct psdS lG el ~s . 1 AI S tT eoE in su a( ml w u+. AT EO R /

N i

nE Ti1 t tS n i .l e m e mrC eR it c eio rwt i e .

d_

' SI O oG mcAe oe dhdN nr i v MR I m-e oe i tt i cn ho une e -

O C EP . 'c'T P nh _fshi rpec na it .

viu oh .

cp ee qot eia r -

I I ot r

ntf s e_ rws9 Tr rtr U 9n R f 9 c p i8 ae S L '

C S

tg un tsitu neas 0nn oa o g' e /

S rs et ncp G oio E ei ech 7id t nd ti if r D nv l

mits ev e 8ti cu Uh ni aen em mi tio att d e.

A '

7o rrsd rag S ci al cs n s 9. vn ieei e - G ae r i ud u ustv tnt

4. nn t c ag fJe

?F t n

1i qnao tin eae r pn i c

r t s

fo 0. au io

- eirr i i e Gs r . tp Ltm ct e .u e

- m Rn Es re 3ms s ia p8 q u d o 'rMn5 cer I - fr S1 e q n fi eSo ici Ansi i e 1 r e e os bAm0 r u Roi cp l r m s b e enq i r eo adt 3v A yu udd4 noe Ctyo p cno t ac ne e r Ratf . ser i an n

,~~ g l s svnn . Gg N ce 9 n e

,;; n ei ooos ne ifd8 eo hAe m -

i dd friit eic ofae/ l c c1 r d. +

l opttn tyn ti sl 8 c e1 a n u e aC paae al a c u ye T e n

? u R raccm rel eefdd spoee cc srr ss m. _

f tN e ii e orl n a e s.

e s- f effr p i nS ht de eoo 4x _ R eG shiii ree o .l cc ar ttt t

' - uO nttcu ol v ph e s e oe eii f

- n qR a seq cir scv p l f l nn a o eW roupe nhe e ee eoo r N RB TtJSr I ws D. a ee s x eli Rr Dmm D n -

j .

Y T

.4 gW UR I

%yg SO 1 2 3 4 5 GI R .

G P

- r

p7 - ( f;..'~'

n' i Y',! qv.

p@[!p,l.L

_l ,lf

E T +wf

9 xL C 8 9 E / 8 D D P 2 / B B T

X 1 2 T E 1 -  :

m%*L al

. T -

A j a' _

~

TC m- IR MN = 9 t

B '~ 8 n D 0 x"

,UO va / e = B B ST T 8 s T E

wiP n' -

- l .

c.

ay e t ur -

tl n n nt m .ab m a

.c o . as -

rnhi o c

,fn ' " i t

a rgtth~

nmi o

ihe m .b d

y s e

t e as i s

fh oit x rtel eitf e f r

s i

f i

n enaic e nro o pwa e g pi t wi t oth r rer m .si yYw^ oen r a o- wt

- i st t d i

- ' b ese r tn n t so n t2 t1 myt nsuaa o

p aoo o c

nnm o c e 9. no rmt t ao

" l ajrdw it r

o t e edl e nmmw ereo e

s go ats Wf -

pys1 r dii t n3o t i c

n n

enc poi a

i t

v modl ef rrl a l r e

t ust oya e

~=W _

ev uid aa nt eh e i cl tr nc 'g i

n otn t ae

. cd it a r

t .

sn i el u pil q

co wli f

t a

edt l ~ s b1 n ar f f

t a

j' tul - e sii i o rtnw t s3o s ndaef b tf ni o n w m ont ro .

eis i t enid e ome t

.S coso cnmg

'e r l ti ma cut n nraa m

p l od n a

U t s : d r l r f

T 'w i n a uus aep a c o afh l A or ri  ; .

oJt e

l riy l e

.c p

= j- T S

/

l ef or l t of o aa t t

s n

l a . t l

h o t

i r l uft i oii ehtl v

e m yi ech t nw b y

wuni e cnu wew v si d se

f~N- O o eon ~ mm i oo r4ub yut 't I t riio ri - 2 o u2Ja r sqr n T ol tm o ttl - p s . - i o nrp eo e

.- P tt a ~c caa F e l f m

I ncnre ecn R g rh . e ofe p R eaiet t li o n ot nr d i r o C me 3 pa s efi gi t - u e t e l w"=E x_

S D

. e r.

r i nise n

g o qu u

e q

l ci l ed it nr i u rd afrn ro r o e

l d

u ccG enO t aR e

v e

uel ed e e pd u nsut e olW d s qh pta r wsa dn eeoc h rlB ewma r x' , - r ey ssti arn sa t

n e

y .

rne doh it di et l a o '

gth e l nef eine u- f c

s s

pi rvoy or en t

i d

n e

cal nt ndaon d m l t -

acf e

. l z ai smo e o i t udi csel u

a umi n neoc t g i5an t . a si t l 1 nea e ot a sr d nrsg

. se edab s l3 adm m i onl ne eg r nb a e m a t rgp i n tiean ua a u

.(-

. i en nl i pi e nhthi ct e nl i

q m; sn ee eu e vayol l . d etf l h soe w

~

- rhbii af dtei rd riaeu ro t ri r r

_ ut tw nf and e rw gd ut W;- .

s Teecg srrin da ra tS et srel erht e- y wer su u

cteah sth c sne t g nn ei soao eh ct s i~

t n

e eoefi n dut n t s eeucs ml a6f e m smtil i t uc~ e en stn d e e ig d i itp L n l rt s l e i i st nu rot n n

~

vrnsm sa ceee t vP mis ef ct sa e x f.

yYlo eooua hl nvh r uo eO h e me n uh m s RfmJs TP I otp Ot RL5tt A r I 2Jc A

, f - ' -

9

- i .'

- m, wl:'Y-i T-I.

1

~

~

jR t -

sOe 6 -

7 3 9 u.Ws# P gI l .

r R -

7 - _

1,: ' -

u5 n$cpkn .*'-

p H O ~ ,' f ' l- ;h o[

lg!!  ;' :l

E T

tt i

vm i d vm i d C h m 0 en en E tb 9 D ce ce P i u / B em em X

E ws 2 T rA rA L

A T

TC I R MN t 9 0 t t B n 8 9 n n UO e / / e e ST s 9 1 s s s

h d t t e no g

n d at o n l n s m e pe i i m s sr h 8em nn y ri t 1h o oo p r ou t c a t q w r e s d s s ae e enr d ee s rr g i pi n sr e e n v . C o a c ns .i em ra edR c hbt e enec ceN e t n n gocu r nt s i na i id og oa wol s l t ve t o c . 0 i p a eirr r mon 3 nt sd e dp ol o . oas )

ensy e r i t o i ce S i o b d n f et n t tit P d cf oys

. i o yar ra e af a P ci m s rir S es t r l et c e p d ett (

l eti o ad a nsp o n pss b gul t c c et o l o oun m anoia i si un e c J o e S ra b r naf qet v e w m t .

U T

eh sae pciin hhi c c emn rua d e s l

o

.d e sy yt A o l e eCe f rl 0 l) . si T dt eg TR p t p e 1 a5h n l S d nnr' NS ns r 0cg ki

/ aae l G ong u m oHii cb N o md e O el ii n t o tWh s aa O l epes Rh a t i u r F we b r I l i se WTc aer f f )( d pe T db uai B i rh u 3 3 mp P naqed n bTd r s 1 e8n uo I arer s .h i o e ( c5i p R e ce i mc l e f m .i1h l C t pt nl h ee a .l i v3t l o S ronib ttT ceb d t C. r - i oo E ana a i gi e 2 e0 w op D tid sr r d tas i t d sD p s nee ot e nt s f r e n E s n eut p f nv eue i a v ofN n no ord ao eo moc . t t i i o i oi t aer tnep mr u ce n s e t sa is rtf rgag e c iti m ss ss so avm t n n d G e d use se t enn l oi pr sit a i D R noyr er nceos nl oh o l rp erh mt pe ienc t d s Csas pp muwer eo da d mh ait u

cf es s

e n

e t

n eean rnt pu us rsn t e i eri u t e st e s i wns l nr mrah q x m na) v r ueoo oe s t e e d eeE e eo qtdiy eid i rd r n chG hf eitt r htn eene o e i (d t rsuaa t au spau t t m L r e t fh cs c s n A ect sn df sis sit sesr e t sti a ee eo f e af p ecuu m s t eafl dupm s ti c wie snl p d e n swiu i nnt e cc i ou n u e id ct l i veasn U en v nU e q c vees cu ehl un S po eons m e e eepo nq R wpJ u GS c Rt aG A R R Rf sp I e Y

T I

UR 0 a a SO 1 1 2 / /

GI 1 1 n n R

?

f 7 l

(  !

{

4 3

• ATTACHMENT II The effect of drywell temperature increase on suppression pool hydrodynamics can be addressed by evaluating the effects on peak drywell pressure.

An increase of the initial drywell temperature from 135 degrees Fahrenheit to 145 degrees Fahrenheit with the same containment and drywell initial pressure and dew point temperature selection will result in a lower calculated peak drywell pressure. A higher initial drywell temperature results in less air mass in the drywell and a lower drywell relative humidity. With less air mass and a lower relative humidity, a larger portion of the steam blowdown will be used to increase the drywell humidity as opposed to increase the drywell temperature and the corresponding pressure; the net effect is a lower calculated peak drywell pressure.

This behavior is documented in FSAR section 6.2.1.1.3.1.2 which indicates that with a drywell temperature range of 100 degrees Fahrenheit or 135 degrees Fahrenheit, the 100 degrees Fahrenheit case yields the bounding peak pressure differential of 19.2 pst. The magnitude of such reduction for initial drywell temperatures between 100 degrees Fahrenheit and 145 degrees Fahrenheit is about 0.07 psi; therefore, the calculated peak drywell pressure can be considered as independent to the initial drywell pressure. Since a lower peak drywell pressure leads to a lower maximum pool swell velocity, the generic pool swell impact load definition based on 50 ft/sec maximum velocity remains bounding.

The above evaluation concludes that the generic hydrodynamic load definitions specified in GESSAR and accepted by NUREG 0978 are not affected by the increase in drywell temperature and remain applicable for RBS.

m