1996 Fiscal Year Final Research Report Summary
Development of simultaneous helium generation technique during neutron irradiation
| Project/Area Number |
07458110
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear fusion studies
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| Research Institution | Tohoku University |
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Principal Investigator |
MATSUI Hideki Tohoku University Institute for Materials Research, Professor, 金属材料研究所, 教授 (50005980)
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| Co-Investigator(Kenkyū-buntansha) |
NARUI Minoru Tohoku University Institute for Materials Research, Research Associate, 金属材料研究所, 助手 (20250821)
SHIKAMA Tatsuo Tohoku University Institute for Materials Research, Associate Professor, 金属材料研究所, 助教授 (30196365)
KAYANO Hideo Tohoku University Institute for Materials Research, Professor, 金属材料研究所, 教授 (60005890)
FUKUMOTO Ken-ichi Tohoku University Institute for Materials Research, Research Associate, 金属材料研究所, 助手 (30261506)
KIMURA Akihiko Tohoku University Institute for Materials Research, Associate Professor, 金属材料研究所, 助教授 (90195355)
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| Project Period (FY) |
1995 – 1996
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| Keywords | Fusion reactor materials / helium effects / uranium / triple fission / ferritc steels |
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| Research Abstract |
Since the helium generation rate in fusion reactor environments is much greater than in fission reactors, in order to investigate irradiation effects in fusion materials some measure to generate helium must be undertaken simultaneously with neutron irradiation. The aim of this project is to develop a simultaneous helium generation technique which is applicable to materials such as ferritic steels where conventional techniques are difficult to apply.
The concept of the technique is as follows : fissionable materials, e.g.uranium generate high-energy alpha particles at a certain probability in fission reactions. Specimens placed next to such material piece are injected with helium when they are irradiated in a fission reactor. The projected range of this helium is on the order of several tens micro-meters in typical engineering materials e.g.steels. Uniform helium injection may be obtained if the specimens are sandwiched with fissionable materials from both sides provided that the thickness of the specimens are less than several tens micro-meters.
Although the principle of this method is rather simple. It has never been tested before until the present successful project. It is also very significant to note that this method provides a technique of simultaneous helium generation in engineering materials such as ferritic steels, where suitable simultaneous helium generation technique did not exist. It is very important that this technique be applied to ferritic steels using a high flux fission reactor to study the helium effects in these materials and bring to an end to the long controversy on the helium embrittlement of ferritic steels.
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