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Journal Articles

Impacts of freeze-thaw processes and subsequent runoff on $$^{137}$$Cs washoff from bare land in Fukushima

Igarashi, 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:1 Percentile:29.38(Environmental Sciences)

Journal Articles

Study on optimizing microwave heating denitration method and powder characteristics of uranium trioxide

Segawa, Tomomi; 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$$_{3}$$ 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.

Journal Articles

Research and development on HTGR fuel

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.

JAEA Reports

Acceleration irradiation test of first-loading fuel of High Temperature Engineering Test Reactor (HTTR) up to high burnup (Joint research)

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

Journal Articles

Development of a plutonium air monitor for emergency environmental monitoring

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.

JAEA Reports

Improvement of fuel fabrication process for High Temperature Engineering Test Reactor; Countermeasures to criticality accident

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

Journal Articles

Selection of filter media used for monitoring airbone alpha-emitting particles in a radiological emergency

Kinouchi, Nobuyuki; Oishi, Tetsuya; Noguchi, Hiroshi; Kato, Shohei; Ishizawa, Masato*

Radioisotopes, 50(9), p.403 - 407, 2001/09

no abstracts in English

Journal Articles

Establishment of the Asian and Oceanic Association for Radiation Protection (AOARP)

Kato, Shohei

Hoken Butsuri, 36(2), p.159 - 160, 2001/06

no abstracts in English

Journal Articles

Journal Articles

Does a new radiation protection system proposed by Prof. Clarke bring a paradigm shift?, 3; Radiation protection system and the principle

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.

Journal Articles

Effects of baseline on uncertainty of radiation risk models

Nakayama, Teruyuki; Kato, Shohei

Radiation Risk Assessment Workshop Proceedings, p.140 - 150, 2001/00

no abstracts in English

Journal Articles

Preparation of IRPA-10

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

Journal Articles

Selection of filter media in alpha air monitors for emergency environmental monitoring

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

Journal Articles

A Model of risk perception; A Model of "Subjective Detriment"

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

Journal Articles

Coment to Controllable Dose

Kato, Shohei

Hoken Butsuri, 35(1), p.96 - 98, 2000/01

no abstracts in English

Journal Articles

Report on the special session of JCO criticality accident at 1999 ANS Winter Meeting

Soda, Kunihisa; Kato, Shohei; Ishii, Tamotsu*

Nihon Genshiryoku Gakkai-Shi, 41(12), p.1234 - 1235, 1999/12

no abstracts in English

JAEA Reports

Cause finding experiments and environmental analysis on the accident of the fire and explosion in TRP bituminization facility

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

Journal Articles

Measurement of HTO permeability parameters of materials for protective appliances

Yokoyama, Sumi; Noguchi, Hiroshi; Kinouchi, Nobuyuki; Yamamoto, Hideaki; Kato, Shohei; *; *

Hoken Butsuri, 34(1), p.57 - 66, 1999/00

no abstracts in English

Journal Articles

Journal Articles

Test of dust scattering caused by dumping of concrete materials

Kinouchi, Nobuyuki; Kato, Shohei

KURRI-KR-30, p.12 - 19, 1998/00

no abstracts in English

37 (Records 1-20 displayed on this page)