Neutronics Analysis for K-DEMO Blanket Module with Helium coolant June 26, 2013 Presented by Kihak IM Prepared by Y.S. Lee Fusion Engineering Center DEMO.

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Presentation transcript:

Neutronics Analysis for K-DEMO Blanket Module with Helium coolant June 26, 2013 Presented by Kihak IM Prepared by Y.S. Lee Fusion Engineering Center DEMO Technology Division / In-Vessel Component Team PPPL-NFRI Meeting, June 26-28, 2013, at PPPL

Thickness of Blanket Layers in the Current K-DEMO  Inboard Blanket [Thickness = 1,050 mm]  Outboard Blanket [Thickness = 1,200 mm] W Li 4 SiO 4 Cooling channel Be B4CB4C Structural Material W FW – 4 mm RAFM ~ 15 mm He Channel ~ 10 mm RAFM – 2 mm Ceramic pebble breeder Manifold & Structures Shield Inb. Blanket Be 31 FW Be Manifold & Structures Shield Outb. Blanket Be 31 FW Be 50

Concept of Blanket (One Module) Cooling Channel  FW requires a dedicated cooling channel…. Maximum neutron wall load area The other 8 cooling channels, 6 mm wide each, have common inlet/outlet (Peak) 3 MW/m 2 neutron wall load + ~0.5 MW/m 2 radiation heat load (f core_rad = 0.5)

Neutronic Analysis Model for Inboard/Outboard Blanket (One Module) for Thickness Optimization between Layers Thickness of Layer (cm) Accumulated Thickness (cm) FW0.4 Cooling Channel2.7 ( ) st Breeder Cooling Channel1.2 ( ) nd Breeder Cooling Channel1.2 ( ) st Be Cooling Channel1.0 ( ) rd Breeder Cooling Channel1.0 ( ) th Breeder Cooling Channel1.0 ( ) nd Be Cooling Channel1.0 ( ) th Breeder Cooling Channel1.0 ( ) rd Be Cooling Channel0.8 ( ) MW neutron (max.) = 2.13x10 18 n/s [unit in cm] Shielding behind the breeding blanket is not included yet.

Neutronics Analysis  Accumulated TBR = (for one module) [unit in cm] Neutron Reflection B.C. at sides (Minor) Neutron penetration at back side Neutron Back-scattering at front (~10% ?) If neutron back-scattering at front is counted in, TBR could be increased by ~10% (?).  3D full sector model is required to get reliable TBR  3D sector model is under construction… NOT ENOUGH to meet global TBR >1, considering non-breeding zone, such as divertor and ports.

Generated Heat in the individual layer (for NWL = 3 MW) 3.3 MW (Energy multiplication factor = 1.1) Could be increased if back-scattered neutrons are counted in Be Li Breeder  Important data for cooling design Some heat generation in W and RAFM

Power density in the HCCB module Tungsten Li-breeder (exo-thermic reaction) Power density is higher in tungsten and Li-breeding zones

Future Work  Shielding will be added and optimized.  Model expansion is on-going to cover 3-D, 22.5 degree toroidal sector of both inboard and outboard blankets, to consider the reflected neutrons and global TBRs.  will give more reliable global TBR…  T-H analyses are on-going in parallel at the moment for appropriate cooling design.