Arbeiter, Frederik

Gordeev, Sergej

Qiu, Yuefeng

Schwab, Florian

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KIT – The Research University in the Helmholtz AssociationThermal-mechanical analysis and design optimizationsof the IFMIF-DONES HFTMFlorian Schwab, Frederik Arbeiter, Sergej Gordeev, Yuefeng QiuInstitute for Neutron Physics and Reactor Technology (INR) Contact: Dipl.-Ing. Florian Schwab, florian.schwab@kit.eduPoster contribution P1.21430th SOFT 2018, Giardini Naxos, Sicily - ItalyConclusions:• Parametric CAD model of HFTM, including capsules is ready.• FEM analysis show low deflection away from target.• Brazing-process is working but with still some potential to improve.International Fusion Materials Irradiation Facility (IFMIF) High Flux Test (HFTM) Device to enable the irradiation of Small Scale Testing Technique (SSTT)specimens with a fusion relevant neutron flux of up to 5·1016 neutrons/s. Generation of irradiated material data for design, licensing, constructionand safe operation of future fusion reactors.Outlook (aspects that will be further investigated):• Capsule manufacturing is ongoing with focus on brazing processimprovement.• Elastic-plastic simulation of HFTM Container 8x4 planned.• Lowering the number of stiffening bars of the container mini-coolingchannels.• Na-filling tool and process under development.• Development of Multi-Connector solution for HFTM and Test Cell (TC).• FEM analysis for different operational cases and less stiffening bars.• Full stress assessment in accordance with RCC-MRx.• Development of Monitoring Capsules.IFMIF-DONES HFTM IrradiationCapsule Assembly:• Specimen Bin is combined withits bottom closure to a new part,manufactured by sinker-EDM:Avoids the failure-prone welding ofbottom closure.• Increase heater-wire lifetime byincreasing heater-wire bendingradius from 2.0 mm to 3.0 mm.• heater-wire bending radiusincrease doubles the capsulethickness and the theoreticalspecimen payload volume toroughly 46.8 cm3.• New inlet and outlet design ofheater-wire groove on SpecimenBin (no empty grooves anymore,increase of heater-wire lifetime).• NaK is replaced by Sodium (Na),because NaK produces Argon (Ar)isotopes under neutron irradiation.IFMIF-DONES HFTM Container 8x4:• HFTM Container twice as thick as inIFMIF/EVEDA: 102.2 mm (possible due to 50%nuclear heating and no other modules in Test Cell).• New container structure (Slots with integratedMini-Cooling Channels) effects higher structuralstiffness: better pressure resistance and lessdeflection.• Capsules directly inserted in Slots (without rig hull),surrounded by Helium Mini-Cooling Channels• 32 Slots per Container, 4 Slots per ContainerCompartment in beam-direction.• Helium coolant flow direction reversal causesless deflection of Attachment Adapter Assembly.• 2.0 mm thick external walls on up- and downstreamside and 10.0 mm thick reflectors on left and rightside, like in IFMIF/EVEDA.• Tool for alkali metal injection is installed onlyduring filling and replaced by Irradiation CapsuleInstrumentation Assembly, before irradiation. Thisprevents Sodium leaking during operation even ifinternal capsule pressure will rise.• Knobs on Capsule Sleeve are not needed anymore because of updated container design.• Brazing process is re-designed as well, thecapsules will be filled up now from bottom to top,supported by mini-channels in Specimen Bin andCapsule Sleeve.2. Thermal-mechanical analysisReflector on left Sidein x-direction[mm]Comp.-Stiff.-Plate No. 04in x-direction[mm]Reflector on right Sidein x-direction[mm]upstream downstream upstream downstream upstream downstream-0.13 -0.21 -0.46 -0.45 -0.77 -0.69Reflector on left Sidein y-direction[mm]Comp.-Stiff.-Plate No. 04in y-direction[mm]Reflector on right Sidein y-direction[mm]upstream downstream upstream downstream upstream downstream-0.73 -0.86 -0.63 -0.77 -0.74 -0.86Reflector on left Sidein z-direction[mm]Comp.-Stiff.-Plate No. 04in z-direction[mm]Reflector on right Sidein z-direction[mm]upstream downstream upstream downstream upstream downstream-1.53 -1.40 -1.57 -1.43 -1.52 -1.39Global Model Mesh:• Nodes: 19 687 210• Elements : 10 365 162Sub-Model Mesh:• Nodes: 8 791 873• Elements : 2 645 114• Sub-Model shows localized high stresses in the transitions of the mini-cooling channels on top and at the bottom of the Slot Section, causedmainly by primary stresses.• Maximum stress on pressure bearing wall of Container is 133 MPa. Theaveraged von Mises stress of Comp.-No. 04 is 76.62 MPa and of thewhole Container it is 44.3 MPa. So, the stresses are on acceptable level.1. Design Improvements

Thermal-mechanical analysis and design optimisation of the IFMIF-DONES HFTM

https://publikationen.bibliothek.kit.edu/1000081771/17996019

Thermal-mechanical analysis and design optimisation of the IFMIF-DONES HFTM

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