sol vacuum vessel fs shield gap thickness (cm) fw gap + th. insulator winding pack plasma 4.8 2 ≥...
Post on 19-Dec-2015
220 views
TRANSCRIPT
SO
L
Vac
uu
m V
esse
l
FS
Sh
ield
Ga p
Thickness(cm)
FW
Gap
+ T
h. I
nsu
lato
r
Win
din
g P
ack
Pla
sma
4.8 2 ≥ 231 312.228
≥ 149 cm| |C
oil C
ase
& I
nsu
lato
r
Bla
nk
et(L
iPb
/FS
/He)
47
Bac
k W
all
9 1G
ap
Ext
ern
al S
tru
ctu
re
18
ARIES-CS LOCA Thermal AnalysisCarl Martin and Jake Blanchard
University of Wisconsin
LiPb/FS/He Radial Build(Water Cooled Internal VV)
Permutations
• Questions:– Which coolants are lost?– Which are present, but static?– Which are flowing naturally?– Which still have forced flow?
– Does plasma stay on?
FE Model and Boundary Conditions for Thermal Analysis
Blanket Shield Vacuum Vessel
First WallTinit = 500 C
LiPBTinit = 625 C
Back WallTinit = 450 C
ShieldTinit = 450 C
Vacuum VesselTinit = 100 C
Gap
Gap
Rad
ius
= 2
.0 m
• Adiabatic boundary at back of vacuum vessel
• Model is axisymmetric about plasma centerline and symmetric on sides
• Assumed there is no helium or water in channels
Ferretic Steel Boronated Ferretic Steel LiPb
Transient Temperature Response Without Heat Removal
Seven Day Response Thirty Day Response
Note that LiPb afterheat is underestimated!
Transient Temperatures Without Heat Removal
After 1 Hour
After 1 Day
Note that LiPb afterheat is underestimated!
Analysis with Natural Convection to Water in Vacuum Vessel
Blanket Shield Vacuum Vessel
First WallTinit = 500 C
LiPBTinit = 625 C
Back WallTinit = 450 C
ShieldTinit = 450 C
Vacuum VesselTinit = 100 C
Gap
Gap
Rad
ius
= 2
.0 m
• Natural convection to water in vacuum vessel included in model
• Heat transfer coefficient of 500 W/m2-C to 100 C water assumed
• Emissivity of 0.1 assumed in vacuum gaps
Ferretic Steel Boronated Ferretic Steel LiPb
wat
e r
wa t
e r
wa t
e r
Transient Temperature Response with Natural Convection in Vacuum Vessel
Seven Day Response
Note that LiPb afterheat is underestimated!
Side By Side Comparison
Without VV Cooling With VV Cooling
Note that LiPb afterheat is underestimated!
Sensitivity of Maximum Temperature to Gap Surface Emissivity
1000
1050
1100
1150
1200
1250
1300
1350
0 0.1 0.2 0.3 0.4 0.5 0.6
Gap emissivity
Ma
xim
um
Te
mp
era
ture
(C
)
Repeat without LiPB in Channels
Blanket Shield Vacuum Vessel
First WallTinit = 500 C
Back WallTinit = 450 C
ShieldTinit = 450 C
Vacuum VesselTinit = 100 C
Gap
Gap
Rad
ius
= 2
.0 m
Ferritic Steel Boronated Ferritic Steel
SiC liner
SiC liner
Analysis with Natural Convection to Water in Vacuum Vessel
Blanket Shield Vacuum Vessel
First WallTinit = 500 C
Back WallTinit = 450 C
ShieldTinit = 450 C
Vacuum VesselTinit = 100 C
Gap
Gap
Rad
ius
= 2
.0 m
• Natural convection to water in vacuum vessel included in model
• Heat transfer coefficient of 500 W/m2-C to 100 C water assumed
• Emissivity of 0.1 assumed in vacuum gaps and channel passages
Ferritic Steel Boronated Ferritic Steel
wat
e r
wa t
e r
wa t
e r