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MELCOR LOFA Analysis. Paul Humrickhouse Brad Merrill INL Fusion Safety Program. ARIES Meeting Gaithersburg, MD. May 31 st -June 1 st , 2012. The SiC blanket input deck has been modified to reflect recent design changes - PowerPoint PPT Presentation
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MELCOR LOFA Analysis
Paul HumrickhouseBrad MerrillINL Fusion Safety Program
May 31st-June 1st, 2012
ARIES Meeting
Gaithersburg, MD
Fusion Safety Program
• The SiC blanket input deck has been modified to reflect recent design changes
• The previous vacuum vessel structure has been divided into a thin, high temperature He-cooled structure, which radiates to a low-temperature water cooled shield
• Air injection is no longer employed
• The back of the water cooled shield is now an adiabatic boundary (super-insulation)
• Modeling complicated by the fact that both PbLi and Water are used
– MELCOR can only model one liquid in a given problem
– The PbLi is actually modeled in this problem
– The water mass flow rate is taken from tabulated ITER calculations for natural convection
Status of ARIES-ACT MELCOR Model
Fusion Safety Program
Previous Model• Convection, and radial/axial radiation and/or conduction
accounted for in model• ITER-like thermal cryo-shields on outer surface of vacuum
vessel (VV)
IBHTS IBB OBB I OBB II
240
265245 250
260275
290
280
235
300 295
225
230220
200
215
205 210 285
UD
LD OTHDR
ITHDR
270
U-IBHTS
L-IBHTS
IBVV OBVVOBHTS
To VVHTS
From VVHTSTo PbLi
HTS
From PbLiHTS
290
Fusion Safety Program
Updated Model• Convection, and radial/axial radiation and/or conduction
accounted for in model
IBHTS IBB OBB I OBB II
240
265245 250
260275
290
280
235
300 295
225
230220
200
215
205 210 285
UD
LD OTHDR
ITHDR
270
U-IBHTS
L-IBHTS
IBVV OBVVOBHTS
To VVHTS
From VV HTS
To PbLiHTS
From PbLi HTS
290
Fusion Safety Program
Results for a LTSBO (LOFA)
- 500 C VV operating temperature is assumed- Room temperature water-cooled shield- Significant natural circulation of LiPb in the blankets redistributes heat between inboard and outboard.
Model overstates inboard cooling
Fusion Safety Program
• The basic structure of the model is in place; design details are now needed
• Decay heats for all structures
• Material composition of all structures (i.e. tungsten, tungsten carbide (WC), SS, etc.)
• Build details and component dimensions
• Including pipes, structures, etc.
• Desired operating temperatures of structures (flow rates will be adjusted in MELCOR to match these)
Needs
