Tritium permeation induced by water corrosion of metals

2017 Fiscal Year Final Research Report

• Project/Area Number: 26289364
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Nuclear engineering
• Research Institution: Kindai University (2016-2017); Kyushu University (2014-2015)
• Principal Investigator: OTSUKA Teppei 近畿大学, 理工学部, 准教授 (80315118)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: トリチウム / 透過 / 腐食

Outline of Final Research Achievements

Models of transport of tritium through metal/water or water/metal interfaces are proposed as follows, (1) Tritium entry in metals by water corrosion, (2) Tritium release into water by oxidation, (3) effects of residual stress on tritium permeation behaviors (1) and (2).
A part of tritium produced by water corrosion of metals dissolves and enters in interstitials of metals. The rate of permeation of tritium is determined by fugacity of tritium dissolution and diffusivity of hydrogen in metals. Atomic tritium permeated through the metals is released into water by oxidation of atomic tritium to water form. The effects of stress or strain on tritium permeation is very small.

Free Research Field

材料科学、トリチウム理工学、材料ー水素相互作用