1993 Fiscal Year Final Research Report Summary
APPLICATION OF ION IRRADIATION FOR MECHANISTIC STUDY ON NEUTRON IRRADIATION EMBRITTLEMENT IN STEELS
| Project/Area Number |
04558028
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Nuclear engineering
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| Research Institution | THE UNIVERSITY OF TOKYO |
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Principal Investigator |
ISHINO Shiori TOKAI UNIVERSITY FACULTY OF ENGINEERING,PROFESSOR, 工学部, 教授 (70010733)
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| Co-Investigator(Kenkyū-buntansha) |
TUKAMOTO Tetsuo ORIGIN ELECTRIC,CO.SENIOR RESEARCHER, 研究開発本部, 主任研究員
UEDONO Akira UNIVERSITY OF TOKYO RESEARCH CENTER FOR ADVANCED SCIENCE AND TECHNOLOGY RESEARCH, 先端科学技術研究センター, 助手 (20213374)
KAWANISHI Hiroshi THE UNIVERSITY OF TOKYO,SCHOOL OF ENGINEERING,RESEARCH ASSOCIATE, 工学部, 助手 (40010970)
SEKIMURA Naoto THE UNIVERSITY OF TOKYO,SCHOOL OF ENGINEERING,ASSOCIATE PROFESSOR, 工学部, 助教授 (10183055)
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| Project Period (FY) |
1992 – 1993
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| Keywords | PRESSURE VESSELE STEEL / IRRADIATION EMBRITTLEMENT / ION IRRADIATION / LOW TEMPERATURE IRRADIATION / ELECTRIC RESISTIVITY MEARUREMENT |
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| Research Abstract |
Neutron irradiation embrittlement in pressure vessel steels in light water reactors is one of the critical issues to understand mechanisms of embrittlements and prediction of lifetime of the component. In this study, ion irradiation experiments which have excellent controllability of irradiation conditions such as temperature and ion flux are applied to establish physical models of irradiation embrittlement in steels. Specimen chamber for ion irradiation is designed and installed in the HIT facility of the University of Tokyo. This irradiation chamber technically requires temperature control between liquid N2 temperature and 573K,electric resistivity capability and ion beam profile measurements. These are completed by detailed design of the irradiation chamber and specimen size. Ion irradiation experiments are performed at liquid N2 temperature and room temperature with 1 MeV and higher energy of protons. The alignments of ion beams to the position of specimens and Faraday cups are successfully made during ion irradiation. An iron-copper model alloy irradiated with protons has radio-activity which causes difficulty to handle the irradiated specimen after irradiation. On-beam electric resistivity measurements is found to be difficult because of the noise signals from the specimen during irradiation, but electric resistivity at low temperatures can be measured by interrupting ion beam. The annealing processes of defect clusters in irradiated iron specimens are analyzed after ion irradiation, and fundamental information on defect formation and hardening behavior in steels are obtained.
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