Fischer, U.

Loughlin, M.

Lu, L.

Pereslavtsev, P.

Polunovskiy, E.

Vielhaber, S.

KITopen

Modelling and Shielding Analysis of the Neutral Beam Injector Ports in ITER P. Pereslavtsev, U. Fischer, M. Loughlin*, Lei Lu, E. Polunovskiy*, S. Vielhaber  Karlsruhe Institute of Technology (KIT) Institute for Neutron Physics and Reactor Technology (INR) P.O. Box 3640, D-76021 Karlsruhe, Germany *ITER Organization, Route de Vinon-sur-Verdon, CS 90 046,  13067 St. Paul Lez Durance Cedex, France Objective   Inclusion new model of the NBI ports must be included in the available 80o MCNP model of ITER NBI sector. The following nuclear responses must be provided: • Nuclear heating distribution in the vacuum vessel • Nuclear heating in all ducts • Nuclear heating and total doses to TFC magnets • He-production and DPA distributions in VV • Biological shutdown dose rates inside cryostat out of VV 28th SOFT Conference, September 29th – October 3rd, San Sebastian, Spain, 2014   -150 -100 -50 0 50 100 150 200 2500,05,0x1051,0x1061,5x1062,0x106  1 TFC   2 TFC   3 TFC   4 TFC   Dose [Gy/year]Poloidal coordinate [cm]Insulator-150 -100 -50 0 50 100 150 200 2500,05,0x1091,0x10101,5x10102,0x10102,5x10103,0x10103,5x10104,0x1010 TFC 1 TFC 2 TFC 3 TFC 4  Neutron flux [n/cm2 s]Poloidal coordinate [cm]InsulatorCONCLUSIONS  • NBI geometry models were generated by the conversion software McCad from engineering CAD models which had been adapted to the neutronic requirements. • A high quality, detailed MCNP geometry model of ITER with the NBI ducts included was produced. • Spatial distributions were calculated for several nuclear responses: the neutron flux, the nuclear power density, He- and DPA production rates. • The dose to the insulator of the TFC magnets was shown to be lower than the ITER design radiation limits. The same applies for the nuclear loads to the TFC magnets.  • The decay gamma dose rates in the space between vacuum vessel and TF were obtained using the advanced R2Smesh-2.1 method.  • The results demonstrate a quite reliable shielding performance of the NBI ports shields assumed in the ITER design.  New NBI ports CAD model horizontal cut vertical cut Power density distribution in vacuum vessel Power density distribution in all ducts Dose rate distribution inside cryostat out of VV DPA and He-production in vacuum vessel Dose and Neutron flux in insulator of theTF coils Original CAD model Simplified CAD model Old NBI ports New NBI ports Modification of the ITER CAD model Simplification of the original CAD models MCNP ITER model with new NBI ports (McCad conversion) 

Modelling and shielding analysis of the neutral beam injector ports in ITER

https://publikationen.bibliothek.kit.edu/220097171/3816621

Modelling and shielding analysis of the neutral beam injector ports in ITER

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