Recycling, inventory and permeation of hydrogen isotopes and helium in the first wall of a thermonuclear fusion reactor
The behaviour of hydrogen in metals is examined. After consideration of the presence of hydrogen isotopes in fusion reactors, the main phenomena of hydrogen-metal interaction are summarised : solubility, diffusivity and trapping in material defects. The main parameter is the metal temperature. Characteristic times are also defined. The interaction between helium and metals is then considered. The various phases of the development of helium bubbles and voids inside the material are discussed and an appropriate theoretical approach outlined. Finally the main types of damage caused are listed. A model is identified which simulates the evolution of a system formed from a metal into which hydrogen and helium isotopes have been introduced. A system of algebraic differential equations is used to describe the temporal evolution of the concentrations, the recycling, the inventory and the permeation of atoms through the metal lattice, including allowance for the decay of tritium.
Bibliographic Reference: EUR 11937 EN (1990) 149 pp., MF, ECU 8
Record Number: 199010244 / Last updated on: 1994-12-01
Original language: en
Available languages: en