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Cs washoff from bare land in FukushimaIgarashi, Yasunori*; Onda, Yuichi*; Wakiyama, Yoshifumi*; Yoshimura, Kazuya; Kato, Hiroaki*; Kozuka, Shohei*; Manome, Ryo*
Science of the Total Environment, 769, p.144706_1 - 144706_9, 2021/05
Times Cited Count：4 Percentile：20.23(Environmental Sciences)Segawa, Tomoomi; Kawaguchi, Koichi; Kato, Yoshiyuki; Ishii, Katsunori; Suzuki, Masahiro; Fujita, Shunya*; Kobayashi, Shohei*; Abe, Yutaka*; Kaneko, Akiko*; Yuasa, Tomohisa*
Proceedings of 2019 International Congress on Advances in Nuclear Power Plants (ICAPP 2019) (Internet), 9 Pages, 2019/05
A solution of plutonium nitrate and uranyl nitrate is converted into a mixed oxide by microwave heating denitration method. In the present study, for improving the efficiency of microwave heating and achieving high-temperature uniformity to produce homogeneous UO
powder, the microwave heating test of potassium chloride and uranyl nitrate solution, and numerical simulation analysis were conducted. The potassium chloride agar was adjusted to the dielectric loss, which is close to that of the uranyl nitrate solution and the optimum support table height was estimated to be 50 mm for denitration of the uranyl nitrate solution by microwave heating. The adiabator improved the efficiency of microwave heating denitration. Moreover, the powder yield was improved by using the adiabator owing to ease of scraping of the denitration product from the bottom of the denitration vessel.
Ueta, Shohei; Aihara, Jun; Yasuda, Atsushi; Izumiya, Toru*; Takahashi, Masashi*; Kato, Shigeru*; Sawa, Kazuhiro
Koon Gakkai-Shi, 32(1), p.27 - 35, 2006/01
In the high temperature gas-cooled reactors (HTGRs), refractory coated fuel particles are employed as fuel to permit high outlet coolant temperature. The High Temperature Engineering Test Reactor (HTTR) employs Tri-isotropic (Triso) coated fuel particles in the prismatic fuel assembly. Research and development on the HTTR fuel has been carried out spread over about 30 years, in fuel fabrication technologies, fuel performance, and so on. Furthermore, for upgrading of HTGR technologies, an extended burnup TRISO-coated fuel particle and an advanced type of coated fuel particle, ZrC-coated fuel particle in order to keep the integrity at higher operating temperatures has been developed. The present paper provides experiences and status of research and development works for the HTGR fuel in the HTTR Project.
Sawa, Kazuhiro; Sumita, Junya; Ueta, Shohei; Takahashi, Masashi; Tobita, Tsutomu*; Hayashi, Kimio; Saito, Takashi; Suzuki, Shuichi*; Yoshimuta, Shigeharu*; Kato, Shigeru*
JAERI-Research 2002-012, 39 Pages, 2002/06
JAERI-Research-2002-012.pdf:3.12MB
no abstracts in English
Kinouchi, Nobuyuki; Oishi, Tetsuya; Noguchi, Hiroshi; Yoshida, Makoto; Kato, Shohei; Ito, Katsuhito*
Radioisotopes, 51(2), p.71 - 77, 2002/02
We have developed an air monitor which is possible to measure rapidly and sensitively the concentration of plutonium for the environmental monitoring at an accident of a nuclear reprocessing plant. The monitor is designed to collect airborne plutonium by drawing the ambient air through a filter and to detect the activity by alpha spectroscopy. The following two methods are equipped with the monitor: continuous measurement at atomospheric pressure and batch measurement at vacuum. The description of the air monitor and the results of performance test are reported.
Takahashi, Masashi; Ueta, Shohei; Yasuda, Atsushi*; Yoshimuta, Shigeharu*; Kato, Shigeru*; Sawa, Kazuhiro
JAERI-Tech 2001-091, 29 Pages, 2002/01
JAERI-Tech-2001-091.pdf:2.38MB
no abstracts in English
Kinouchi, Nobuyuki; Oishi, Tetsuya; Noguchi, Hiroshi; Kato, Shohei; Ishizawa, Masato*
Radioisotopes, 50(9), p.403 - 407, 2001/09
no abstracts in English
Kato, Shohei
Hoken Butsuri, 36(2), p.159 - 160, 2001/06
no abstracts in English
Kato, Shohei
Hokeikyo Nyusu, (27), p.2 - 3, 2001/03
no abstracts in English
Kato, Shohei
Nihon Hoken Butsuri Gakkai Wakushoppu Houbunshu, p.7 - 8, 2001/00
Professor Clake proposed a darstic change of radiation protection system of 1990 ICRP recommendation in 1999. The change is expected to affect current radiation protection system. The background of the propsal and the changes are introduced. Opposition, questions and requests to the new proposal are introduced.
Nakayama, Teruyuki; Kato, Shohei
Radiation Risk Assessment Workshop Proceedings, p.140 - 150, 2001/00
no abstracts in English
Kato, Shohei; Inoue, Yasushi*; Kaneko, Masato*; Kai, Michiaki*; Fujimoto, Kenzo*; Suzuki, Seishiro*; Takaue, Tamiji*; Kumagai, Tetsuyuki*
Hoken Butsuri, 35(3), p.319 - 326, 2000/09
no abstracts in English
Kinouchi, Nobuyuki; Oishi, Tetsuya; Noguchi, Hiroshi; Kato, Shohei; Ishizawa, Masato*
Proceedings of 10th International Congress of the International Radiation Protection Association (IRPA-10) (CD-ROM), 4 Pages, 2000/05
no abstracts in English
Saito, Seiko; Kato, Shohei
Proceedings of 10th International Congress of the International Radiation Protection Association (IRPA-10) (CD-ROM), 7 Pages, 2000/05
no abstracts in English
Kato, Shohei
Hoken Butsuri, 35(1), p.96 - 98, 2000/01
no abstracts in English
Soda, Kunihisa; Kato, Shohei; Ishii, Tamotsu*
Nihon Genshiryoku Gakkai-Shi, 41(12), p.1234 - 1235, 1999/12
no abstracts in English
Fujine, Sachio; Murata, Mikio; Abe, Hitoshi; Takada, Junichi; Tsukamoto, Michio; Miyata, Teijiro*; Ida, Masaaki*; Watanabe, Makio; Uchiyama, Gunzo; Asakura, Toshihide; et al.
JAERI-Research 99-056, p.278 - 0, 1999/09
JAERI-Research-99-056.pdf:22.73MB
no abstracts in English
Yokoyama, Sumi; Noguchi, Hiroshi; Kinouchi, Nobuyuki; Yamamoto, Hideaki; Kato, Shohei; ;
Hoken Butsuri, 34(1), p.57 - 66, 1999/00
no abstracts in English
Kato, Shohei
Hoken Butsuri, 33(3), p.355 - 357, 1998/09
no abstracts in English
Kinouchi, Nobuyuki; Kato, Shohei
KURRI-KR-30, p.12 - 19, 1998/00
no abstracts in English
