| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Outline of Final Research Achievements |
Irradiation embrittlement of pressure vessel steels in a fission reactor is one of the key phenomena which may determine operation lifetime. Regulations such as JEAC4201-2013 are currently used as a powerful tool to assess the degree of vessel’s embrittlement. However, even the physically-based regulations are not appropriate to be applied to the environments given by future nuclear fusion reactors and by high-level radioactive waste vessels, because those irradiation conditions are far from that of fission reactors. The objective of this study is to develop more precise assessment tool by employing a multiscale modeling approach, where the nucleation process of CRPs (copper rich precipitates) in Fe is investigated. The rate of CRP nucleation is obtained as a function of the dose-rate and temperature. Chemical composition of precipitates is also obtained. Finally, it is confirmed that our calculations are qualitatively consistent with experiments.
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