Hydrogen permeation through F82H tube under pressurized water

Tanigawa, Hisashi; Yoshikawa, Akira; Enoeda, Mikio

In the design of a test blanket module (TBM) being developed by JAEA, the partial pressure of tritium is controlled to be about 1 Pa using helium purge gas. The tritium diffusion coefficient in F82H steel is an important parameter for the permeation calculation. The permeation behaviour of deuterium affected by the oxide layer was observed by the in-situ experiment. In addition, it was found that hydrogen caused by the oxidative reaction can permeate through the tube. Using the apparent diffusion coefficient obtained in the study, tritium permeation in the TBM is estimated.