FIRE
Vacuum Vessel
and
Remote Handling
Overview
B. Nelson, T. Burgess, T. Brown, D. Driemeyer, H-M Fan, K. Freudenberg,
G. Jones, C. Kessel, P. Ryan, M. Sawan, M. Ulrickson, D. Strickler,
D. Williamson
FIRE Physics Validation Review
March 31, 2004
Presentation Outline
Vacuum Vessel
Design requirements
Design concept and features
Analysis to date
Status and summary
Remote Handling
Maintenance Approach & Component Classification
In-Vessel Transporter
Component Replacement Time Estimates
Balance of RH Equipment
Design and analysis are consistent with pre-conceptual
phase, but demonstrate basic feasibility of concepts
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FIRE vacuum vessel
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Vacuum vessel functions
Plasma vacuum environment
Primary tritium confinement boundary
Support for in-vessel components
Radiation shielding
Aid in plasma stabilization
conducting shell
internal control coils
Maximum access for heating/diagnostics
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Vacuum vessel parameters
Configuration: Double wall torus
Shielding water + steel with 60% packing factor
Volume of torus interior 53 m^3
Surface Area of torus interior 112 m^2
Facesheet thickness 15 mm
Rib thickness 15 - 30 mm
Weight of structure, incl ports 65 tonnes
Weight of torus shielding 100 tonnes
Coolant
Normal Operation Water, 50 ksi is in gray color
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Divertor problem fixed, we think
A few fixes around the pins and holes seems to do the trick
We also need to push the pin reaction toward the shell to reduce bending
Extended pins
through the ribs
and attached them
to the outer shell
Reinforced of pins near
connection points
Increased hole Modified rib
Diameter to 0.7” thickness to 1.5Sm = 26 ksi Stress is in psi
correct values (195 Mpa)
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Stress ksi is in gray color
Nuclear heating and thermal effects
Vacuum vessel is subject to two basic heat loads:
Direct nuclear heating from neutrons and gammas
Heating by conduction from first wall tiles (which in turn are heated by direct
nuclear heating and surface heat flux)
A range of operating scenarios is possible, but the baseline cases
for analysis assume:
150 MW fusion power
100 W/cm^2 surface heat load assumed on first wall,
45 W/cm^2 is current baseline (H-mode)
> 45 W/cm^2 for AT modes
pulse length of 20 seconds (H-mode - 10T, 7.7 MA)
Pulse length of 40-ish seconds (AT mode - 6.5T, 5 MA)
Vessel is cooled by water
Flowing in copper first wall cladding
Flowing between walls of double wall structure
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Vessel and Remote Handling
Heat loads on vessel and FEA model
Fusion power of 150 MW
Surface heat flux is variable, 0, 50,100, and 150 W/cm2 analyzed
Volumetric heating in FIRE components - new
IB OB
Be PFC 20.7 22.1
Cu Tiles 29.1 28.7
Gasket 25.2 25.2
Cooled Cu Vessel 24.9 24.9
Cladding
D C B
H2O FWCoolant 17.1 19.2
SS Inner VV Wall 21.0 19.2
A
SS VV Filler 20.4 17.7
H2O VV Coolant 9.2 9.6
SS Outer VV Wall 18.8 0.0
Double wall Cu Tile,
Vac Vessel cladding (36 mm)
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