Diffusion of cesium in stainless steel under condition of oxygen potential controlled by Mo/MoO2 or NbO2/Nb2O5 oxygen buffer.
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概要
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The kinetic behaviors of cesium migration in SUS-316 stainless steel for a cladding material of fast breeder reactor were studied using radioactive <SUP>134</SUP>Cs as a tracer. The oxygen potential in the atmosphere surrounding the specimen was controlled by Mo/MoO<SUB>2</SUB> or NbO<SUB>2</SUB>/Nb<SUB>2</SUB>O<SUB>5</SUB> oxygen buffer, which corresponds approximately to the one in fuel-cladding gap during irradiation. The concentration profile of Cs in the specimen was analyzed on the basis of diffusion theory. The temperature dependences of diffusion coefficients of Cs in SUS-316 stainless steel were expressed in the range of 650800°C by the following equations:<BR>In the oxygen potential controlled by Mo/MoO<SUB>2</SUB> oxygen buffer, <BR><I>D</I>=0.15 exp (-63, 500/<I>RT</I>) (cm<SUP>2</SUP>/s).<BR>In the oxygen potential controlled by NbO<SUB>2</SUB>/Nb<SUB>2</SUB>O<SUB>5</SUB> oxygen buffer, <BR><I>D</I>=9.0×10<SUP>-5</SUP> exp (-50, 300/<I>RT</I>) (cm<SUP>2</SUP>/s), <BR>where the activation energy is expressed in terms of cal/mol.
- 一般社団法人 日本原子力学会の論文