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Journal Articles

Design and burn-up analyses of new type holder for silicon neutron transmutation doping

Komeda, Masao; Arai, Masaji; Tamai, Kazuo*; Kawasaki, Kozo*

Applied Radiation and Isotopes, 113, p.60 - 65, 2016/07

https://doi.org/10.1016/j.apradiso.2016.04.014

Times Cited Count：2 Percentile：19.71(Chemistry, Inorganic & Nuclear)

We designed and fabricated a new type holder that achieved uniform doping under long-term use at JRR-3. The new type holder uses an aluminum alloy and B $_{4}$ C particles as filter materials to ensure uniform vertical flux distribution. Although the amount of filter material decreases with long-term use, it was found that the doping distribution did not change by much until 800 h. The lifetime of the new type holder (of the order of hundreds of hours) depends mainly on the amount of trapped radioactive isotopes. This indicates that the decrease in filtering ability over the filter's lifetime is not significant. The filtering ability remains stable for a long time, and the difference in the vertical doping distribution is 1.08 at 1600 h and 1.18 at 4000 h. The irradiation efficiency is expected to increase by 1.7 times when using the new type holder.

Journal Articles

Reconstruction and criticality experiment in new JRR-3

Onishi, Nobuaki; Takahashi, Hidetake; Takayanagi, Masaji; Ichikawa, Hiroki; Kawasaki, Minoru

Nihon Genshiryoku Gakkai-Shi, 32(10), p.962 - 969, 1990/10

https://doi.org/10.3327/jaesj.32.962

Times Cited Count：4 Percentile：47.14(Nuclear Science & Technology)

no abstracts in English

Oral presentation

The Electric installation at environment of nuclear fusion, 48; Development of penetration part processing industrial method in radiation controlled area

Izumi, Keisuke*; Iguchi, Masayuki*; Kawasaki, Masaji*; Okawa, Yoshinao*; Oka, Kiyoshi; Yamagata, Ryohei; Koyanaka, Akihiro*

no journal, ,

At penetration parts in radiation controlled areas, such as walls and floors where cables go through, the high-airtight performance is required in order to control the negative pressure of air-conditioning. Moreover, since the cables get deteriorated by radiation, the easy replacement works are indispensable. However, the materials in general use have neither resistance, nor any sheltering performance against radiation. In this research, we have developed radiation-proof materials, to meet both an airtight and a sheltering performance.

Oral presentation