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Journal Articles

Selection of borosilicate glass composition for neutron irradiation test

Nagai, Takayuki; Uehara, Akihiro*; Fujii, Toshiyuki*

KURRI Progress Report 2017, P. 128, 2018/08

https://www.rri.kyoto-u.ac.jp/PUB/report/PR/ProgRep2017/CO4.pdf

In this study, to understand the structural change of a borosilicate glass by a neutron irradiation in detail, the neutron irradiation test was carried out for 50 min in the Pn-2 of the Kyoto University Research Reactor (KUR). The structural change of glass sample after the irradiation will be estimated in 2018FY. Before the irradiation test, the glass composition was selected to estimate a structural change accurately by Raman spectrometry and 2 kinds of Li free borosilicate glass for the irradiation test samples were prepared.

Journal Articles

Study on neutron beam pulse width dependence in the nuclear fuel measurement by the neutron resonance transmission analysis

Kitatani, Fumito; Tsuchiya, Harufumi; Toh, Yosuke; Hori, Junichi*; Sano, Tadafumi*; Takahashi, Yoshiyuki*; Nakajima, Ken*

KURRI Progress Report 2017, P. 99, 2018/08

https://www.rri.kyoto-u.ac.jp/PUB/report/PR/ProgRep2017/CO2.pdf

Journal Articles

Measurement of MA reaction rates using spallation neutron source

Oizumi, Akito; Fukushima, Masahiro; Tsujimoto, Kazufumi; Yamanaka, Masao*; Sano, Tadafumi*; Pyeon, C. H.*

KURRI Progress Report 2017, P. 50, 2018/08

http://www.rri.kyoto-u.ac.jp/PUB/report/PR/ProgRep2017/PR9.pdf

In the nuclear transmutation system such as ADS, the nuclear data validation of MA is required to reduce the uncertainty caused by the nuclear data of MA. This study aims to measure the reaction rates of Neptunium-237 ($$^{237}$$Np) and Americium-241 ($$^{241}$$Am) using the nuclear spallation neutron source in the KUCA for 3 hours. The observed distributions of pulse-height of $$^{237}$$Np and $$^{241}$$Am fission reactions were significantly different from the ones generally observed in critical and pulsed neutron source (PNS) experiments because of the influence of the $$gamma$$-ray generated by the nuclear spallation reaction. On the other hand, the capture reaction rate of $$^{237}$$Np was measured in this experiment. The capture reaction rate of the critical experiment which was available to be measured the fission reaction rate of $$^{237}$$Np and $$^{241}$$Am was almost 8 times larger than that of this experiment. Consequently, reducing the influence of the $$gamma$$ generated by the nuclear spallation reaction and extending the duration of the irradiation to 24 or more hours would be necessary for detecting signals of fission reactions under the spallation neutron source.

Journal Articles

Neutron irradiation effect of high-density MoO$$_{3}$$ pellets for Mo-99 production

Fujita, Yoshitaka; Nishikata, Kaori; Namekawa, Yoji*; Kimura, Akihiro; Shibata, Akira; Sayato, Natsuki; Tsuchiya, Kunihiko; Sano, Tadafumi*; Fujihara, Yasuyuki*; Zhang, J.*

KURRI Progress Report 2017, P. 126, 2018/08

http://www.rri.kyoto-u.ac.jp/PUB/report/PR/ProgRep2017/Progress_Report2017_web.pdf#page=139

no abstracts in English

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