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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 1 Status of He-EFIT Design Richard – J. F Pignatel – G. Rimpault Pierre Richard – J. F Pignatel – G. Rimpault
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 2 Outline Recall of the Design Approach Main Issues Addressed since the February (Bologna) Meeting Updated Table of He-EFIT Main Characteristics Presentation of the current core design : Core, Spallation module, Power Conversion Cycle DHR Approach Conclusions – Next steps
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 3 1 – Spallation module design using the outcome of the PDS-XADS Project 2 - Define the Proton Beam Intensity (for a maximum proton energy of 800 MeV), the reactor power and the K eff (assuming the potential reactivity insertions and burn up swing which have to be checked later) 3 - Design the core taking into account the design objectives (MA burning, Keff considerations,…) and the core design constraints (Fuel composition, cladding composition, pressure drops,…) ---------------------------------------------------------------------------------- 4 - Define the approach for the DHR and design the DHR main components (blowers, HX,…) 5 - Design the primary system 6 - Design the Balance of Plant and Containment and implementation of the plant (cooling loops, confinment building, …) Steps 2 and 3 require iteration loops with neutronics, T/H and geometry considerations Required some time He-EFIT Design Approach
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 4 Evolutions since the Bologna Meeting (1/3) Proton beam characteristics : Energy changed from 600 MeV to 800 MeV which is currently considered as an upper limit : over 800 MeV, the radio-toxicity increase rapidly Need for higher proton beam intensity 18-22 mA instead of 10-20 mA Plant Efficiency : First Assessment made at CEA : with Tin/Tout = 400/550 °C AMEC/NNC : incentive to increase the Tcore from 150 °C to 200 °C Decision from the Lyon meeting (03/06) : Tin/Tout = 350/550 °C Plant efficiency increased to 43.3 % Fuel Characteristics : CERCER (MgO matrix) limit temperature at nominal conditions decreased from 1860 °C to 1380 °C CERMET (Mo matrix) considered as back up solution (decision from the Cadarache meeting in June) S/A Characteristics : S/A Outer width over flats reduced from 162 mm to 137 mm : target size corresponding to 19 S/A at the center of the core
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 5 Evolutions since the Bologna Meeting (2/3) Core Design : Core power decreased to 400 MWth (600 MWth before) 3 zones core with different pin diameters Peaking factors : Total peaking factor changed from 1.61 to 1.839 : iteration with neutronic calculations Adaptation to He-EFIT of the objectives defined by the “Specialist Meetings” (March-June 2006) : 42 Kg MA burnt par TWhth Flat Keff versus BU Reasonably low current requirement < 20 mA Low pressure drop < 1.0 bar Clad temperature limit < 1600°C (transient), < 1200°C (nominal) Coolant speed < 50 m/s Others : Wrapper Thickness, Number of grids, …
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 6 Evolutions since the Bologna Meeting (3/3) Cross-check with FzK and modifications of the correlations for Heat Exchange Coefficients, Core Pressure Drops and Fuel Conductivities (According to DM3 recommendations) : Rather good agreement : Core composition f < 0.05 % Fuel Max Temperatures T< 20 °C Cladding Max Temperatures T< 6 °C Pressure drops : incoherency in the Dh calculations but small consequences : ( P) < 0.034 bar Safety : Pressure drop limited to 1 bar for the core and 1.5 bar for the whole primary circuit Provisional value to be checked by appropriate transient calculations DHR strategy - Comparison of different two approaches : “XADS-like” approach / GCFR approach
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 7 Main Characteristics of the Gas-Cooled EFIT (1/3)
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 8 Main Characteristics of the Gas-Cooled EFIT (2/3)
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 9 Main Characteristics of the Gas-Cooled EFIT (3/3)
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 10 Current Design A three zone core has been preliminarily studied : Zone 1 (inner) : 45 MWth, 42 sub-assemblies Zone 2 (intermediate) : 165 MWth, 156 sub-assemblies Zone 3 (outer) : 191 MWth, 180 sub-assemblies The main hypothesis and/or design objectives accounted are the following : Core heigth : 125 cm External width over flat : 137 mm Fuel (fuel+matrix) fraction in the diffrent zones : 11%, 21.5 % and 35 % (for respectively zone 1, 2 and 3) Matrix volmue fraction in the fuel pellet : 50 % -The total form factor was assumed to be the same in the three zones (1.839) Remarks : 1 - Core pressure drops are not equilibrated (too many design constraints). They are respectively 0.84, 0.74 and 1 bar in zone 1, 2 and 3 some gagging will be necessary 2- The pellet diameter in zone 1 is rather small (2.3 mm). If this induces some problem, the number of pin rows per S/A can be reduced to 11 row per S/A.
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 11 Current Design – 50 MW/m 3 (1/2)
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 12 Current Design – 50 MW/m 3 (2/2)
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 13 “Cold” Window Concept (1/2)
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 14 He flow Target lower peripheral ring also in W (assume a porosity of 50% for He flow)) Target central part made of a bundle of horizontal W-rods (see detail A) Dext = 266 mm “Cold” Window Concept (2/2) Axial pitch Proton Beam Radial pitch Helium
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 15 Power Conversion Cycle – AMEC-NNC Assessment Assumptions : Keeping the indirect Supercritical CO 2 cycle with re- compression CO 2 remains super-critical : CO 2 characteristics above the Critical Point (74 bar/32 °C). This avoids the presence of water in the compressors (badly known behaviour of the components) CEA Low Heat sink Temperature considered too restrictive : 16 °C 21 °C Parametric study on the core inlet temperature : +/- 50 °C
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 16 Power Conversion Cycle Turbine Auxiliary Compressor Main Compressor 43.3 %
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 17 Decay Heat Removal - Approach Goal : Compare different strategies : Active/Passive Guard Containement/No guard Containment Background : GCFR Approach PDS-XADS (He-cooled XADS)
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 18 Schematic of DHR system (CEA initial proposal) Exchanger #2 pool Exchanger #1 core Secondary loop dedicated DHR loops H1 H2 Guard containment -3 loops of DHR -3 pools -1 guard containment
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 19 DHR (CEA studies)
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 20 GFR STRATEGY (CEA Approach) For the GFR 2400MWth -The high back-up pressure strategy (25Bar) is not kept -for GFR the intermediate back-up pressure strategy (~5 Bar) is studied -Back Up solution :The full depressurisation (1Bar) (still not studied)
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 21 PDS-XADS Basic Reactor options: Reactor power : 80MWth First core: classical FBR fuel U-PuO2 (35% Pu max) Accelerator: designed for 600MeV/6mA but can be upgraded to 800MeV/10mA Core and Target Unit designed for 600MeV/6mA Separated target: liquid Primary circuit: He No Guard Containment Full depressurization 1 Bar Integrated SCS (but only 2 MWth to be removed by each SCS) DHR Strategy :
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 22 Integrated SCS (Electric Power 55kW) PDS-XADS SCS Design
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 23 DHR for EFIT For He-EFIT: The PDS-XADS solution seems better Proton beam complexity Guard containment not keep If the full depressurization is chosen, a strategy must be defined : The blowers must work 1 to 70 Bars : Requires High Power and a complex Blower Design (or 2 systems : 1-10 bars and 10/70 bars? ) OR Blowers can work only at low pressure : Acton for fast depressurization System systematically used (safety) SIMPLIFICATION of procedures System implementation : 3 DHR loops designed for 100 % 2 Solutions : Loops integrated on the vessel/Ex-vessel loops
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 24 Conclusions (1/2) Current Design : A three zone core has been preliminarily studied : Zone 1 (inner) : 45 MWth, 42 sub-assemblies Zone 2 (intermediate) : 165 MWth, 156 sub-assemblies Zone 3 (outer) : 191 MWth, 180 sub-assemblies The main hypothesis and/or design objectives accounted are the following : Core height : 125 cm External width over flat : 137 mm Fuel (fuel+matrix) fraction in the different zones : 11%, 21.5 % and 35 % (for respectively zone 1, 2 and 3) Matrix volume fraction in the fuel pellet : 50 % -The total form factor was assumed to be the same in the three zones (1.839) DHR Approach under discussion
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WP1.5 Meeting, Lyon, October 10-11, 2006, P. Richard, J. F. Pignatel, G. Rimpault 25 Conclusions (2/2) Next steps : Detailed neutronic calculations : Neutron source behaviour by the mean of MCNPX Calculations Core neutronics by the means of MCNPX and ERANOS calculations. Even if the current core design is not fully defined, He-EFIT main characteristics (core power, main core dimensions) are sufficiently defined to go ahead with : Safety Approach/DHR strategy : Pre-sizing of the DHR loop components (AREVA ??) CATHARE/SIM-ADS modelling (CEA/FzK ???) Remontage (AREVA) Dissemination of the main He-EFIT design characteristics – Iteration with the partners
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