Radiation enhanced diffusion and permeation of hydrogen in stainless steel

Abstract

Measurements of the radiation enhanced diffusion and permeation of hydrogen in stainless steel type 4301 (s. s. 304) in the temperature range of 350 to 600 ~ are reported. As radiation source an edge position of the ASTRAreactor core was used (dose rate 0.1 to 0.5 W/g). The permeation as well as the diffusion coefficient were found to be considerably larger during irradiation than the thermal effects at the same temperatures (measured by ohmic heating with the reactor shut down). A detailed description of the apparatus is given together with a discussion of the resuhs hitherto achieved.* This research was supported in part by the "Fonds zur F6rderung der wissenschaftlichen Forschung in Osterreich", Vienna (Proj. Nr. 3423).

Hydrogen isotope population near dislocations in zirconium from molecular dynamics

“…Permeability is proportional to both solubility and diffusivity of tritium. Interestingly, radiation is often found to enhance diffusion and permeation of hydrogen isotopes in metals [ 3 ]. Solubility and diffusivity are likely to significantly change under reactor conditions due to the formation of irradiated defects such as point defects [ 4 , 5 ] and dislocations [ [6] , [7] , [8] , [9] , [10] , [11] ].…”