Schlindwein, Georg

English

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KIT – The Research University in the Helmholtz AssociationInstitute for Neutron Physics and Reactor TechnologyMetrology and Experimental Techniques Group   (INR-MET)Mechanical testing of the IFMIF HFTM-DC prototype during operation in the HELOKA-LP helium loopAuthor: Georg Schlindwein georg.schlindwein@kit.edu +49 721 / 608-23974Key features:• Low pressure (0.3 MPa a.) helium gas cooled pressure vessel• Low neutron attenuation in beam direction by a thin-walled container design• Effective utilisation of the limited high flux region (500 cm³ @ ≥ 20 dpa/fpy1)by the use of mini cooling channels1 displacements per atom per full power yearBackground:The IFMIF-HFTM (International Fusion Irradiation Facility) is a dedicateddevice to irradiate material specimens with neutrons having an energyspectrum peak near 14 MeV → Design database for DEMOThe High Flux Test Module - Double Compartment (HFTM DC)• Prototype design is derived from the IFMIF HFTM-Vwith a reduced number of compartments from 8 to 2• Construction at 1:1 scale→ cooling flow conditions identical to the original IFMIF-HFTM• Compartment A loaded with 3 full operational rigs(design point temperature 350 °C), compartment B with rig mock-upsStatic pressure testProof of safety at room temperature and a test pressure of 0.545 MPa (g)Nominal operation pressure: 0.3 MPa (abs.)Thermal test SCN TH-006Demonstration of the maximum possible capsule pre-heating temperatureExperimental results FEM simulation• Symmetry of the strain field εx at container centre-line (z=0) in x-direction• 1.5 mm displacement of container towards y-direction (towards IFMIF target)due to asymmetry in module design, no displacement in lateral x-direction• Pressure proportionality of measured strains and deflections• Strain measurements consistent to FEM simulation studies• Magnitude of (-)600 µm/m at 0.545 MPa (g) corresponding to 120 MPa local stress• Detected leakage rate approx. 20 PaL  s-1• No significant residuals of strain and displacement after pressure relief No indication for a plastic deformation or damageSafety of the HFTM-DC prototype successfully confirmed HFTM installation in IFMIFInstrumentation:• 12 digital dial indicators (displacement)• 40 temperature correctedstrain gage sensorsTest conditions: He mass-flow 14.6 g/s (Comp. A), 18.0 g/s (Comp. B) 50 °C compartment inlet bulk gas temperature 0.24 MPa (abs.) compartment inlet pressureExperimental Results:• Maximum container surface temperature 80.9 °C• Large deflection (8.5 mm) of container in x-directiondue to asymmetrical heating• Maximum strain at fast temperature transient: (-)175 µm/m• After capsule heater shut-down values for strain and displacementreturn to their initial, pre-heating state 1. Reproduction of IFMIF relevant cooling flow conditions 2. Possibility to operate capsule 100 K above design point (350 °C) 3. No indications for an excessive deformation of rigs or container

Mechanical testing of the IFMIF HFTM-DC prototype during operation in the HELOKA-LP helium loop

https://publikationen.bibliothek.kit.edu/1000059426/3890205

Mechanical testing of the IFMIF HFTM-DC prototype during operation in the HELOKA-LP helium loop

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