GAIA1 5512
JULY 1979
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GCFR MAIN HELIUM CIRCULATOR AND ELECTRIC DRIVE
by D. D. KAPICH and C. 0. STERRETT*
This is a preprint of a paper presented a t the Helium Breeder
Associates/Department of Energy G CF R Program Technical Review
Meeting, May 31, 1979, Rancho Berpardo, California, and to be
published in the Proceedings.
GA-A15512
Contract D E-AT03-76SF71023 * Westinghouse Electric Corporation,
East Pittsburgh, Pennsylvania I
GENERAL ATOMIC PROJECT 6112 ~ w p o r t w ~ w m n d m n n n r r n i
o n t n r w n * rponaored by the United Stator Covcmmni. Nnther the
Umted Stater nor the Umtod States D e p m n t of
JULY 1979 Emrgy, nor any of their employem, nor any of thelr
anIradon, Nkontmcton, or thet employees, make8 my warmly. cxpre~ or
implred. M amms my k@ lmbillty or rnpondbillty for the accuracy,
cmpletsnstl a urfulnstl of my lnforrmtim, rppmms, pmduct or n r w r
d h l m d , or repmmts that its ur would not r N O T t C E 7
I GENERAL ATOMIC COMPANY I
GCFR M A I N HELIUM CIRCULATOR AND ELECTRIC DRIVE*
D. D. Kapich General Atomic Company
San Diego, C a l i f o r n i a
C . 0. S t e r r e t t Westinghouse E l e c t r i c Corporat
ion
Eas t P i t t sbu rgh , P,ennsylvania
INTRODUCTION
One of t h e major o b j e c t i v e s of t h e helium c i r c u l
a t o r s f o r t h e gas-cooled
f a s t breeder r e a c t o r (GCFR) is t o ach ieve t h e h ighes
t p o s s i b l e o p e r a t i o n a l
r e l i a b i l i t y . This is no simple t a s k cons ide r ing t
h e p l a n t system i n t e g r a t i o n
requirements , a u x i l i a r y suppor t systems, a l l p o s s i
b l e t r a n s i e n t requi rements ,
and r e s u l t i n g complexity i n supplying t h e d r i v i n g
power, primary coo lan t
flow c o n t r o l , and l u b r i c a t i o n and s e a l i n g .
Therefore , t h e des ign of t h e
c i r c u l a t o r i t s e l f is h ighly dependent on t h e type
of prime mover s e l e c t e d t o
d r i v e t h e c i r c u l a t o r , e . g . , s e r i e s t u r b
i n e , p a r a l l e l t u r b i n e , o r e l e c t r i c
motor.
CIRCULATOR EVOLUTION
The c i r c u l a t o r main d r i v e has evolved from t h e
series steam t u r b i n e
d r i v e i n t o t h e var iable-speed, synchronous e l e c t r i
c motor d r i v e mounted
e x t e r n a l l y t o t h e r e a c t o r and c o n t r o l l e d
by t h y r i s t o r v a r i a b l e f requency
c o n t r o l l e r . This des ign i s a r e s u l t of 18 months
of j o i n t e f f o r t by
General Atomic Company and Westinghouse E l e c t r i c Corporat
ion.
This being a t h i r d gene ra t i on of main helium c i r c u l a
t o r s developed by
General Atomic Company, i t has bene f i t ed from exper ience , bo
th p o s i t i v e and
nega t ive , ach iev ing a des ign of which t h e b a s i c phi
losophy i s maximum
s i m p l i c i t y , ruggedness, and o p e r a b i l i t y .
*Work supported by Department of Energy, Cont rac t
DE-AT03-76SF71023.
The adven t of s o l i d - s t a t e c o n v e r t e r s combined w
i t h synchronous motors
h a s pu t a power l i m i t on t h e s e machines a t t h e l e v
e l of l a r g e g e n e r a t o r s .
The e l e c t r i c motor , r a n g i n g up t o 50,000 hp, cou ld
be mounted e i t h e r
h o r i z o n t a l l y o r v e r t i c a l l y i n a d e s i g n f
o r which development r e q u i r e m e n t s
have been w e l l i d e n t i f i e d and a c o n s e r v a t i v e
manufac tu r ing p l a n h a s been
e s t a b l i s h e d . Design and a n a l y s i s e f f o r t s by
Westinghouse c o n t i n u e i n t h e
a r e a s of e x t e r n a l l y damped b e a r i n g s and s u p p
o r t s t r u c t u r e , a iming t o mini-
mize t h e r o t o r dynamic r e s p o n s e throughout t h e e n t
i r e speed range . A
two-loop 400-MW(e) p l a n t wi l l . r e q u i r e a 30,000
hp/3000 rpm (max) d r i v e
motor. A pony motor mounted ou tboard is provided a s backup t o t
h e main
d r i v e motor f o r shutdown c o o l i n g .
Design and development e f f o r t s o n . t h e c i r c u l a t o
r are w e l l under w a y ' a t
General Atomic, w i t h pr imary e f f o r t i n t h e a r e a s of
s e l f - a c t u a t e d water-
l u b r i c a t e d b e a r i n g s and c e n t r i f u g a l f l o
w compressor of a low d i a m e t e r t y p e ,
s p e c i f i c a l l y aimed a t minimizing t h e PCRV h o r i z o
n t a l i n s t a l l a t i o n problems.
DESIGN SELECTION
.Dur ing t h e d e s i g n e v o l u t i o n of t h e GCFR, i t h a
s been recognized t h a t
t h e main hel ium c i r c u l a t o r s need t o produce somewhat
h i g h e r p r e s s u r e rise
t h a n t h e i r e q u i v a l e n t s i n a t y p i c a l HTGR p
l a n t . Because of t h i s , s u b s t a n -
t i a l d r i v i n g power i s r e q u i r e d , making t h e s e
l e c t i o n of t h e t y p e of c i r c u -
l a t o r and i t s prime mover somewhat more d i f f i c u l t .
Kequl reme~~Ls a l f e c t i n g
t h e c i r c u l a t o r d e s i g n a r e l i s t e d i n T a b l
e 1 .
A s t h e GCFR p l a n t d e s i g n h a s evo lved , t h e sys tem
p r e s s u r e . d i f f e r e n t i a l
h a s changed f r n m a r e l a t i v e l y h i g h 6.0 p s i t o a
more moderate r a n g e o f abou t
35 t o 40 p s i . I n t h e c o u r s e of t h e s e s t u d i e s
, v i r t u a l l y a l l p o s s i b l e
c i r c u l a t o r d r i v e r d e s i g n a l t e r n a t i v e s
were c o n s i d e r e d . These i u c l u d e d
two-stage, a x i a l - f l o w , high-speed series t u r b i n e s
; m u l t i s t a g e p a r a l l e l ., t u r b i n e s ; and
submerged and e x t e r n a l e l e c t r i c motor d r i v e s . F
i n a l s e l e c -
t i o n was based on many f a c t o r s , a l l of which p o i n t
o u t t h e need f o r h i g h
o p e r a t i o n a l r e l i a b i l i t y and system s i m p l i
c i t y .
TABLE 1 REQUIREMENTS AFFECTING CIRCULATOR DESIGN
Primary c o o l a n t sys tem paramete rs ( a d i a b a t i c head
, f low e t c . )
NSS paramete rs ( a v a i l a b l e power f o r d r i v i n g ) .
.
P a r t load paramete rs ( f low c o n t r o l )
T r a n s i e n t c o n d i t i o n s ( l o o p t r i p , l o s s
of f o r c e d c o o l i n g , d e s i g n b a s i s d e p r e s s
u r i z a t i o n a c c i d e n t , e t c . )
Other sys tem i n t e g r a t i o n r e q u i r e m e n t s ( a u x
i l i a r y sys tems and c o n t r o l s )
Type u f prime mover s e l e c t e d ( r o t a t i n g speed , e t
c . )
Maintenance and i n - s e r v i c e i n s p e c t i o n r e q u i r
e m e n t s
Other f a c t o r s a f f e c t i n g t h e s e l e c t i o n a r e
t h e need f o r fu l l -power /
f u l l - f l o w c i r c u l a t o r t e s t s p r i o r t o i n s
t a l l a t i o n i n t h e r e a c t o r and t h e
p r e n u c l e a r fu l l -power/hot- f low t e s t s f o l l o w
i n g c i r c u l a t o r i n s t a l l a t i o n i n
t h e r e a c t o r . S e p a r a t i o n o f . t h e c i r c u l a
t o r d r i v e from t h e n u c l e a r s team
supply (NSS) sys tem added t o t h e f l e x i b i l i t y i n t h
e p l a n t sys tem i n t e g r a t i o n
and t h e o p e r a b i l i t y of t h e pr imary c o o l a n t l o
o p s .
The e x t e r n a l e l e c t r i c motor d r i v e concep t h a s
shown s e v e r a l d e f i n i t i v e
advan tages i n t h e a r e a o f c i r c u l a t o r b e a r i n g
and s e a l d e s i g n , and what is
most i m p o r t a n t , i n t h e a r e a of t h e a u x i l i a r
y sys tems r e q u i r e d t o m a i n t a i n
t h e c i r c u l a t o r l u b r i c a t i o n and s e a l i n g
under s t e a d y - s t a t e and t r a n s i e n t
c o n d i t i o n s . With rhe e x t e r u a l e l e c t r i c
drive, many v i t a l i t e m s such a s
speed p r o b e s , t h r u s t b e a r i n g , and a n t i r o t a
t i o n b r a k e have been r e l o c a t e d
o u t s i d e of t h e c i r c u l a t o r b e a r i n g c a r t r
i d g e , t h u s improving e a s e o f main-
t e n a n c e and i n c r e a s i n g p l a n t a v a i l a b i l i
t y .
ELECTRIC MOTOR DRIVE
A synchronous-type motor w i t h a s o l i d r o t o r and t h e
self-commutated
c o n v e r t e r was chosen a s t h e most promising approach f o
r t h e GCFR main
hel ium c i r c u l a t o r d r i v e . While s o l i d r o t o r
tu rbo- type machines are pre-
dominant ly uocd genera to rs ' , a s n h s t a n t i a l number
have been a p p l i e d a s
motors , e . g . , f o r compressor d r i v e s and wind t u n n e
l s . The t h y r i s t o r s .
u t i l i z e d f o r f requency c o n t r o l a r e wa te r c o o
l e d , and c o n s i d e r a b l y s m a l l e r , . .
c a b i n e t s a r e needed compared t o a i r - c o o l e d t h y
r i s t o r s . Also , a i r d u c t s
a r e e l i m i n a t e d , l e s s e n i n g t h e EM1 ( e l e c t
r o m a g n e t i c i n t e r f e r e n c e ) e f f e c t s .
The motor i t s e l f i s i n t e r n a l l y a i r c o o l e d ,
and t h e h e a t i s . r e j e c t e d t o
c o o l i n g w a t e r v i a an i n t e r n a l a i r - to -wate r
h e a t exchanger . The main char -
a c t e r i s t i c s of t h e va r iab le - speed e x t e r n a l
e l e c t r i c motor d r i v e a r e shown
i n Tab le 2 .
TABLE 2 GCFR M A I N CIRCULATOR BASIC CHARACTERISTICS
Compressor C e n t r i f u g a l , s i n g l e s t a g e
D r i v e r E x t e r n a l t o t h e PCRV, two-pole synchronous
motor , i n t e r n a l l y a i r coo led
Flow c o n t r o l
Power
Speed
V a r i a b l e s p e e d , v i a s o l i d - s t a t e a c c o n t
r o l l e r
,Approximately 30,'000 hp max
0 t o 3000 rpm
C i r c u l a t o r b e a r i n g Water l u b r i c a t e d , s e l
f - a c t u a t e d
C i r c u l a t o r hel.i.um s e a l Helium b u f f e r e d l a b y
r i n t h
C i r c u l a t o r w a t e r s e a l Three s t a g e ,
thermohydrodynamic s l i d i n g , LWR t y p e
Motor b e a r i n g s
T h r u s t bear ill8
O i l - l u b r i c a t e d t i l t i n g pad, e x t e r n a l l y
. damped
O i l - l u b r i c a t e d , l o c a t e d i n s i d e motor
Pony motor . Approximately 500 hp, f o u r - p o l e i n d u c t i
o n , so l id -coupled 'to main motor
The arrangement of the c i r c u l a t o r s i n s t a l l e d 111
the' PCKV is shown i n
F ig . . 1, and a c r o s s s e c t i o n of. t h e c i r c u l a t
o r , motor , and l o o p i s o l a t i n n
v a l v e is shown i n F i g . 2 . The pony motor s h o w n . a t t
h e l e f t o f F i g . 2 i s
s i z e d f o r 50% speed d u r i n g subatmospher ic r e f u e l i
n g , t h u s c o v e r i n g t h e 10%
speed requ i rement a s backup d u r i n g p r e s s u r i z e d
cooldown. I t is a four -po le
i n d u c t i o n motor r a t e d . a t approx imate ly 500 hp. It
i s mechan ica l ly des igned
f o r con t inuous o p e r a t i o n a t f u l l main-motor speed.
The a n t i r o t a t i o n b rake
and inboard r a d i a l and t h r u s t b e a r i n g s a r e shown
a t t h e r i g h t . The e x c i t e r
and d i o d e wheels a r e mounted between t h e main and pony
motors .
F i g u r e 3 shows t h e p r i n c i p a l d e s i g n of t h e e
x t e r n a l l y damp'ed r a d i a l
b e a r i n g s . The 1 a t e r a l . r e s p o n s e of t h e r o
t o r h a s been ana lyzed f o r a number
o f d i f f e r e n t s t i f f n e s s e s and damping c o e f f i
c i e n t s a c h i e v a b l e w i t h such a
b e a r i n g . R e s u l t s have shown lqw a m p l i t u d e s
through t h e e n t i r e speed range .
ELECTRIC MOTOR DEVELOPMENT PROGRAMS
Table 3 shows t h e development p l a n proposed by Westinghouse
Corpora t ion
l e a d i n g t o t e s t and d e l i v e r y of , t h e f i r s t
p r o t o t y p e motor . Development
requ i rements of t h e main motor a r e i n t h e a r e a of e x i
s t i n g t echnology and
have t o do mainly w i t h producing s a t i s f a c t o r y e x t
e r n a l l y damped b e a r i n g s t o
keep t h e l a t e r a l r e s p o n s e of t h e r o t o r a t a n
a b s o l u t e minimum. I n a speed
range of 0 t o 3000 rpm, and e s p e c i a l l y w i t h a h o r i
z o n t a l motor , t h i s shou ld
n o t be a problem.
TABLE 3 DEVELOPMENT PLAN FOR ELECTRIC MOTOR
Phase 2
Phase 3
Phase 4
Phase 5
Phase 6
Bear ings and s t r u c t u r e a n a l y s i s
Bear ing model test
F u l l - s c a l e b e a r i n g test
F u l l - s c a l e dynamics model
Motor d e t a i l d e s i g n
Manufacture of motor components
Cvmplete manufac tu re of p r o t o t y p e motor
T e s t and d e l i . v e r y of p r o t o t y p e motor
THE REFERENCE DESIGN CIRCULATOR
The d e s i g n approach f o r t h e main c i r c u l a t o r is p
r e s e n t e d i n T a b l e 4.
F i g u r e 4 i l l u s t r a t e s t h e r a d i a l d i f f u s e
r f o r a two-loop, 400-MW(e) c i r c u l a t o r
[o r a s ix - loop , 1200-MW(e)] . Minimum enve lope d i a m e t e
r has been o b t a i n e d
w i t h good e f f i c i e n c y , a l l e v i a t i n g t h e h o
r i z o n t a l i n s t a l l a t i o n problems r e l a -
t i v e t o t h e PCRV. The impact of t h e e x t e r n a l motor d
r i v e on t h e w a t e r
l u b r i c a t i o n s e r v i c e sys tem r e l a t i v e t o t h
e series s team t u r b i n e d r i v e sys tem
is shown i n F ig . 5 , and F ig . 6 is a f l o w diagram of t h e
b e a r i n g system.
TABLE 4 DESIGN APPROACH FOR M A I N CIRCULATOR
Maximum u t i l i z a t i o n of proven t e c h n o l o g i e
s
E a r l y i d e n t i f i c a t i o n of development r e q u i r e
m e n t s
C o n s e r v a t i v e and rugged r o t o r d e s i g n f o r c i
r c u l a t o r and d r i v e motor
U s e of known t e c h n o l o g i e s
S i m p l i c i t y of s e a l s and b e a r i n g a u x i l i a r
y s u p p o r t sys tems , independent of o t h e r p l a n t sys
tems .
Gravi ty- and backf low-actuated l o o p i s o l a t i o n v a l v
e s c a p a b l e of f uncti.nila1 tests d u r i n g power u p e r
a t i o n
Reduct ion t o a b s o l u t e minimum o r e l i m i n a t i o n of
s e r v i c e ' r equ i rements of machine assembly l o c a t e d i
n s i d e r e a c t o r c a v i t y
F i g u r e 7 shows t h e c r o s s s e c t i o n of t h e b e a r
i n g and seal assembly
w i t h s e l f - a c t u a t e d pump system mounted between t h e
two r a d i a l b e a r i n g s .
The b e a r i n g s are w a t e r - l u b r i c a t e d , h y b r i
d ( p a r t h y d r o s t a t i c / p a r t '
hydrodynamic) w i t h i n d i v i d u a l o r i f i c e compensated
pads . The b e a r i n g
s t i f f n e s s f o r t h e g iven speed r a n g e is on t h e o
r d e r of 0.9 x lo5 t o 6 6 4 .5 x lo5 N/cm ( 0 . 5 x 10 t o 2 .5
x 10 l b / i n . ) , e n s u r i n g s u b c r i t i c a l
( l a t e r a l ) speed o p e r a t i o n th rough t h e e n t i r
e speed range . The m u l t i s t a g e ,
thermohydrodynamic, s l i d i n g , h i g h - p r e s s u r e w a t
e r s e a l i s of t h e LWR pr imary
c o o l a n t pump t y p e w i t h similar s l i d i n g v e l o c
i t i e s , and a somewhat lower
wa te r p r e s s u r e compared t o t y p i c a l LWR c o o l a n
t .pump s e a l s .
Figure 8 i l l u s t r a t e s t h e two-phase helium water
scavenge pump and t h e
bu f f e r helium l a b y r i n t h , which a r e p a r t of t h e
system desc r ibed prev ious ly
(Table 4 and F ig . 4 ) . This system was f u l l y proven i n t h
e l a r g e HTGR main
c i r c u l a t o r tests conducted i n 1978 a t t h e General
Atomic c i r c u l a t o r test
f a c i l i t y .
Figure 9 shows the double shutdown s h a f t s e a l t oge the r w
i th t h e bu f f e r
flow l a b y r i n t h s e a l s . The shutdown s e a l s can be a
c t u a t e d on ly fo l lowing
t h e a c t u a t i o n of t h e e x t e r n a l brake. The
shutdvwn s e a l s , when a c t u a t e d ,
provide redundant i s o l a t i o n of t h e primary coo lan t c a
v i t y from t h e bear ing
c a r t r i d g e and t h e r e s t of t h e a u x i l i a r y bear
ing system.
CIRCULATOR DEVELOPMENT PROGRAMS
Table 5 summarizes t h e c i r cu l a to r ' deve lopmen t
programs. A major
po r t i on of t h e c i r c u l a t o r technology a l r eady e x
i s t s ; i t i s based on s e v e r a l
machines developed and t e s t e d o r ' i n s e r v i c e i n
HTGRs. One of t he .p l anned
improvements i s adopt ion of t h e s e l f - a c t u a t i n g
bear ing system, which would
g r e a t l y s imp l i fy t h e requirements placed on bear ing
and s e a l a u x i l i a r y
modules a s shown i n Tables 3 and 4 and F ig . 4 .
TABLE 5 GCFR M A I N CIRCULATOR MAJOR DEVELOPMENT PROGRAMS
Watcr l u b r i c a t e d s e l f - a c t u a t i n g bear ing
system test
One-third-scale a i r f low compressor and loop i s o l a t i o n v
a l v e t e s t
High-pressure s l i d i n g water s e a l t e s t
Fu l l - s ca l e p ro to type c i r c u l , a t o r and e l e c t
r i c d r i v e t e s t i n c i r c u l a t o r test f a c i l i t
y
F u l l power prenuc lear ho t f low test w i th c i r c u l a t o
r s i n s t a l l e d i n PCRV
The bear ing t e s t r i g (Fig. 10) is capable of t e s t i n g a
f u l l - s c a l e
bear ing assembly i n t h e 0- t o 3600-rpm speed range. The main o
b j e c t i v e of
t h i s t e s t i s t h e v e r i f i c a t i o n of t h e s e l f
- ac tua t ed pump and bear ing
performance. F igure 11 shows a c r o s s s e c t i o n through t h
e t e s t r i g . The
pump assembly can be exchanged t o a l low t e s t i n g ' a n d e
v a l u a t i o n of s e v e r a l
d i f f e r e n t pump geometr ies . The bear ings a r e equipped
wi th induc tance
probes which measure t h e a c t u a l bear ing-to-shaf t e c c e n
t r i c i t y produced by , '
t h e e x t e r n a l load on t h e housing. Rad ia l , t a n g e n
t i a l , and a x i a l load
c e l l s connect ing t h e bear ing housing t o t h e base frame
measure bea r ing
r a d i a l l oads , t o rque , and t h r u s t produced mainly by
t h e pump a c t i o n . The
r i g can supply d a t a on bear ing s t i f f n e s s , load-car
ry ing capac i ty , f r i c t i o n
t o rque , and pump hydrau l i c performance throughout t h e c i r
c u l a t o r o p e r a t i n g
regime. Based on t h e s e d a t a , t h e r o t o r dynamics can
be f u l l y v e r i f i e d
p r i o r t o pro to type c i r c u l a t o r d e t a i l de s ign
and manufacturing.
F igures 1 2 and 13, show t h e one- th i rd-sca le a i r f l o w
test r i g . I ts
primary o b j e c t i v e is t o v e r i f y . the aerodynamic
performance of t h r e e
a l t e r n a t e p'ipe d i f f u s e r geometries i n an e f f o r
t to ' minimize t h e o u t s i d e
d i f f u s e r d iameter whi le ob t a in ing maximum compressor e
f f i c i e n c y . Con-
s i d e r i n g t h e e f f e c t of t h e d i f f u s e r s i z e
on t h e PCRV c o s t on t h e one
hand and t h e c i r c u l a t o r d r i v i n g power on t h e o t
h e r hand, t h e test should I p rovide va luab le in format ion
needed t o op t imize t h i s r e l a t i o n s h i p .
Fig. 1 . 300-MW(e) GCFR nuclear steam supply system
- :q MAIN MOTOR 1 , - C , )
8 - \ CIRCULATOR ROTATING ASSEMBLY
MOTOR SUPPORT BASE VALVE ASSEMBLY DIODE WHEEL ANTI ROTATION
BRAKE
Fig. 2. GCFR main circulator horizontal installation
R E T A l F l L M P I NQ)
F I L M R O D Y N A W I C )
Fig. 3. Damped support bearing .*= 3 ,P
Fig. 4. Diffuser for GCFR main cfirculator
F i g . 5 . Impact of,motor drive on circulator service system
relarive to - series steam turbine drive system
EXTERNAL MOTOR DRIVEN
+ INTEGRAL BEARING
WATER PUMP
BEARING WATER
RECOVERY
Fig. 6. Main helium circulator bearing and seal system flow
diagram
Fig. 7 . Longitudinal section for circulator bearing assembly
Fig. 8. Jet pump system for GCFR-main circulator
Fig. 9. GCFR main circulator seals
Fig. 10. Bearing test rig for GCFR main circulator
Fig. 1 1 . Section through bearing t e s t r i g for GCFR main
circulator
TORQUE SENSOR \
1 ' I 8 <:.I- I, L. $ , , , - A
Fig. I 1 2 . One-third-scale air flow test rig for GCFR
main'-cikulator
1- --- -- 3556 MM (140 IN.) -
/ Er)l:D.. & ACCESS
Ill= DIA
., (21 IN.)
qLAN VIEW (18.5 IN.) (s4 a.1 SIMULATED STEAM WIRE MESH GEWERATOR C
A V ~ ~ Y I " '
TEST IMPELLER I DIFFUSER \-- -4 1 -.: - - 1
TORQUE i2.3IN.l / ~SOU~ON / -i TRANSDUCER TYPA PLC8. VALVE
AXIAL FLOW AIR TURBINE I BURST SHIELD SINOLE STADE . OUTPUT WAFT
BEARING HOUSING 2 m . w ~ (la65 IN.) HUB DIA ar.snnm (16x1 IN.) TIP
DIA 176.7KW (233 H.P.) AT 8800 R.P.M. (DBIGN SPEED) MAX. FLOW 8.28
KGB (13.8s LBISECI(AT 10% OVERSPEED).
2 2 4 8 h ~ (7 FT4.6 IN.)
\ \
TEST VESSEL . - . INLET
Fig. 13. One-third-scale air flow test rig for GCFR main
circulator, plan and elevation views
GENERAL ATOMIC COMPANY P. 0. BOX 81608
SAN DIEGO, CALIFORNIA 92138