Tritium in Molten-Salt Reactors...
Tritium produced from neutron irradiatior of Li, Be, and F, and ternary fission.
FLiBe (2LiF-BeF2) best for thermal-hydraulic and neutronic properties
Tritium production rates estimated to be similar to CANDU reactors
Enrichment in 7Li to limit tritium production (small thermal neutron cross section)
Natural 6Li (7.5%) to produce tritium (large neutron cross section)
Needed for 3He, security, and fusion plant start-up inventories
Tritium Release Pathways... Tritium is highly mobile and diffuses throughout system - major issue for safety and licensing.
Migration Pathways:
Tritium production (neutrons + Li)
Speciation/corrosion (TF vs T2)
Graphite interaction
Evolution into plenum/off-gas system
Diffusion through primary system structural materials
Diffusion into secondary coolant
Diffusion through secondary system structural materials
Release from secondary system plenum/off-gas system
Onwards into ternary system