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MELCOR LOFA Analysis

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

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MELCOR LOFA Analysis

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  1. MELCOR LOFA Analysis Paul Humrickhouse Brad Merrill INL Fusion Safety Program ARIES Meeting Gaithersburg, MD May 31st-June 1st, 2012

  2. 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

  3. Previous Model HS7023 • Convection, and radial/axial radiation and/or conduction accounted for in model • ITER-like thermal cryo-shields on outer surface of vacuum vessel (VV) CV700 CV465 HS7021 CV310 HS10126 HS10128 UD HS10299 U-IBHTS 260 240 275 To VV HTS 280 OBB I IBB OBB II OBVV OBHTS 245 IBHTS 250 265 IBVV 270 HS7001 HS7003 CV700 HS7013 HS7011 HS340 HS330 HS320 HS322 HS332 HS400 HS410 HS411 HS401 HS430 HS440 HS441 HS431 HS450 CV700 CV310 CV330 CV320 CV340 CV400 CV420 CV410 CV430 CV440 CV430 CV450 CV460 CV480 CV300 CV470 300 290 290 295 285 210 205 From VV HTS LD HS10026 HS10028 220 230 To PbLi HTS OTHDR HS10298 235 225 CV310 200 L-IBHTS HS7031 215 ITHDR CV700 HS7033 From PbLi HTS

  4. Updated Model HS7023 • Convection, and radial/axial radiation and/or conduction accounted for in model To VV HTS CV715 CV465 HS7021 CV310 HS10126 HS10128 UD HS10229 U-IBHTS 260 240 275 280 OBB I IBB OBB II OBVV OBHTS 245 IBHTS 250 265 IBVV 270 HS7001 HS7003 CV720 HS7013 HS7011 HS340 HS330 HS320 HS322 HS332 HS400 HS410 HS411 HS401 HS430 HS440 HS441 HS431 HS450 CV705 CV310 CV330 CV320 CV340 CV400 CV420 CV410 CV430 CV440 CV430 CV450 CV460 CV480 CV300 CV470 300 290 290 295 285 210 205 LD HS10026 HS10028 220 230 OTHDR HS10228 235 225 CV310 200 L-IBHTS HS7031 215 ITHDR To PbLi HTS CV700 HS7033 From VV HTS From PbLi HTS

  5. 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

  6. Needs • 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)

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