Development of a Component-Level Hydrogen Transport Model with OpenFOAM and Application to Tritium Transport Inside a DEMO HCPB Breeder

This work continues the development of a numerical model to simulate transient tritium transport on breeder zone (BZ) level for EU helium-cooled pebble bed (HCPB) concept DEMO. The basis is open-source field operation and manipulation framework, OpenFOAM. key output quantities are concentration in purge gas coolant inventory inside BZ structure. New features briefly summarized. As first relevant application simulation single pin out KIT HCPB design DEMO presented. A variety scenarios investigates impact permeation regime (diffusion-limited vs. surface-limited), an additional hydrogen content 300 Pa H2 gas, released species (HT T2), choice species-specific rate constants (recombination constant HT set twice as T2). results indicate that plays minor role permeation. Both show considerable dependence possible addition gas. An enhanced recombination reduces steel T inventories and, diffusion-limited case, also significantly. Scenarios with 80 bar 2 pressure volumetric flow decisive