Hydrogen Permeability in VHTR Heat Exchanger Candidate Materials

摘要

In gas cooled Very High Temperature Reactor concepts tritium is produced as a tertiary fission product and by activation of graphite core contaminants, such as lithium; of the helium isotope, He-3, that is naturally present in the He gas coolant; and the boron in the B_4C burnable poison. Tritium is a radioactive isotope of hydrogen that decays by emission of a beta particle with energy of 18.6 keV with a half-life of 12.3 years.