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Journal Articles

Dosimetry for 110 keV electron beam processing

Seito, Hajime; Matsui, Shinjiro*; Hakoda, Teruyuki; Ishikawa, Masayoshi*; Haruyama, Yasuyuki; Kaneko, Hirohisa; Kimura, Jun*; Kojima, Takuji

Zairyo Gijutsu, 30(1), p.10 - 16, 2012/01

The dosimetry of a 110 keV electron beam (EB) irradiation field is studied using a calorimeter, film dosimeter, and Monte Carlo simulation. This is important base for dose control in practical processing to guarantee the process reproducibility and product reliability. The simulation results are validated on the measurement of the energy fluence obtained by the calorimeter at one position in the air plane at different distances from a beam exit window. The spatial dose distribution obtained from the simulation is compared to that obtained by the film dosimeter. They show good agreement within $$pm$$5.0%. The precision of $$pm$$5.0% is sufficient to control the surface modification of polymers and the development of semiconductor devices in practical radiation processing. These results suggest that film dosimetry results at just one position in the air plane are sufficient to determine the irradiation characteristics of the low energy EB, and to provide a base of quality control measures in practical radiation processing.

JAEA Reports

Information basis for developing comprehensive waste management system; US-Japan Joint Nuclear Energy Action Plan Waste Management Working Group Phase I report (Joint research)

Yui, Mikazu; Ishikawa, Hirohisa; Watanabe, Atsuo*; Yoshino, Kyoji*; Umeki, Hiroyuki; Hioki, Kazumasa; Naito, Morimasa; Seo, Toshihiro; Makino, Hitoshi; Oda, Chie; et al.

JAEA-Research 2010-015, 106 Pages, 2010/05

JAEA-Research-2010-015.pdf:13.58MB

This report summarizes the activity of Phase I of Waste Management Working Group of the United States - Japan Joint Nuclear Energy Action Plan started in 2007. The working group focused on consolidation of the existing technical basis between the U.S. and Japan and the joint development of a plan for future collaborative activities. Firstly, the political/regulatory frameworks related to nuclear fuel cycles in both countries were reviewed. The various advanced fuel cycle scenarios in both countries were surveyed and summarized. Secondly, the waste management/disposal system optimization was discussed. Repository system concepts for the various classifications of nuclear waste were reviewed and summarized, then disposal system optimization processes and techniques were reviewed, and factors to consider in future repository design optimization activities were also discussed. Finally the potential collaboration areas and activities related to the optimization problem were extracted.

Journal Articles

Research and development of high-level radioactive waste management

Ishikawa, Hirohisa

Genshiryoku Handobukku, p.756 - 762, 2007/11

Based on the rivision of the Handbook titled "Genshiryoku Handbook", we submitted the outline of Research and Development of High-level waste management. This chapter consists of the history of R&D of geological disposal, R&D situations of major coutries and Japanese current R&D status related geological disposal.

Journal Articles

Progress of R&D on geological disposal of high-level radioactive waste (HLW) in Japan

Ishikawa, Hirohisa; Igarashi, Hiroshi; Umeki, Hiroyuki; Shimizu, Kazuhiko; Miyahara, Kaname; Ishimaru, Tsuneari; Mitsui, Seiichiro

Proceedings of 6th Pacific Rim Conference on Ceramic and Glass Technology (PacRim6) (CD-ROM), 17 Pages, 2006/09

Final disposal of high-level radioactive waste is essential issue to utilize nuclear energy. JNC has promoted the research and development on disposal technology to contribute to the implementation and safety regulation in the implementation phase after the legislation of the Act on final disposal. The field of the R&D covers geological environment, engineering of geological disposal and performance assessment. As to the two underground laboratories (URLs), surface-based investigations have been carried out and the constructions of both have already started. On the basis of these investigations, geologic environmental models have been developed. The study on natural phenomena such as volcanism and faulting has been conducted. In the above ground research facilities, the development of advanced models, databases for the long-term evolution of the near-field and engineering technologies has been carried out. In terms of safety assessment methodologies, development of relevant databases and advanced safety assessment models and techniques has been carried out. The H17 report will be published in autumn 2005 for the studies conducted in the surface-based investigation phase at the URLs.

Journal Articles

Enhancing the reliability of the technical basis supporting the HLW disposal program in Japan

Ishikawa, Hirohisa; Umeki, Hiroyuki; Naito, Morimasa; Kitamura, Akira; Shimizu, Kazuhiko; Miyahara, Kaname

Proceedings of International Conference on Nuclear Energy System for Future Generation and Global Sustainability (GLOBAL 2005) (CD-ROM), 6 Pages, 2005/10

This paper overviews the current status of R&D activities of JNC and integration of their technical achievements, including the progress of two off-site URL (underground research laboratory) projects, in which the surface-based investigation stage is almost complete.

JAEA Reports

None

Ishikawa, Hirohisa; Sakamaki, Masanori*; Takeda, Seietsu; Yui, Mikazu; Mckinley, I. G.*

JNC TN1400 2004-015, 119 Pages, 2005/03

JNC-TN1400-2004-015.pdf:46.52MB

no abstracts in English

JAEA Reports

ENTRY 2003 - The International Workshop on Reliable Performance Assessment through Laboratory Experiments and Ground Surface Investigations - 10th Anniversary of ENTRY

Ishikawa, Hirohisa; Yui, Mikazu; Uchida, Masahiro; Kamei, Gento

JNC TN8200 2003-004, 151 Pages, 2004/03

JNC-TN8200-2003-004.pdf:1.89MB

To commemorate the 10th anniversary of the ENTRY, a laboratory in JNC Tokai for R&D in the field of geological disposal of radioactive waste, an international workshop was held in JNC Tokai, during the term of Sept 22 to 24, 2003. A technical tour for the Horonobe Underground Research Laboratory site was also done before the workshop, on October 20 to 21, to deepen understanding the background of discussion in the workshop.The workshop contained two sessions. The topic of each session was 1. long-term transition of the near-field and 2. cooperation among the performance assessment, in-situ experiment, and laboratory experiment, respectively. In the session 1, we mainly discussed the thermal-hydrological-mechanical-chemical (THMC) coupled processes for the near-field performance assessment, especially focusing on chemical degradation effects by cement materials and the status of mechanistic understanding radionuclide migration. Silicate dissolution kinetic model, including smectite dissolution in a hyper alkaline solution, was also discussed. Then, we discussed a relevant linkage among laboratory experiments, model (simulation experiment) and database development, in-situ experiment and natural analogue.In the session 2, we discussed (1) methodology for understanding the site based on the surface and boreholes investigations, (2) identification of remained uncertainty after the surface and boreholes investigations, (3) the critical measurement at the surface and boreholes investigations, (4) feedback items from performance assessment to site characterization and (5) required data besides the site investigation. This report contains the minutes of discussion in the workshop. Presented materials were also appended with permission from the speakers.

JAEA Reports

FY 2003 JNC R&D on HLW disposal technology

Fukushima, Isao; Takeda, Seietsu; Yamazaki, Shinichi; Ishikawa, Hirohisa

JNC TN1400 2003-014, 65 Pages, 2004/02

JNC-TN1400-2003-014.pdf:47.43MB

none

Journal Articles

None

Kamei, Gento; Ishikawa, Hirohisa; Yui, Mikazu; Uchida, Masahiro; Aoki, Kazuhiro

Saikuru Kiko Giho, (21), p.95 - 98, 2003/12

None

JAEA Reports

None

; ; ; ; Ishikawa, Hirohisa; *

JNC TN1400 2002-019, 36 Pages, 2003/02

JNC-TN1400-2002-019.pdf:11.59MB

no abstracts in English

Journal Articles

JAEA Reports

None

Yoshikawa, Hideki; Ishikawa, Hirohisa;

JNC TN8200 2001-004, 160 Pages, 2001/06

JNC-TN8200-2001-004.pdf:129.13MB

None

Journal Articles

None

; Ishikawa, Hirohisa

Saikuru Kiko Giho, (11), p.139 - 142, 2001/06

None

Journal Articles

None

Ishikawa, Hirohisa

Saikuru Kiko Giho, (9), p.41 - 48, 2000/12

None

Journal Articles

An Overview of High-Level Radioactive Waste Disposal in Japan

Ishikawa, Hirohisa

The 2000 Joint Workshop on High-level Waste Management between Korea and Japan, 0 Pages, 2000/00

None

Journal Articles

An Overview of R&D for High-level Radioactive Waste Disposal in Japan

Ishikawa, Hirohisa

The 2000 Joint Workshop on High-level Waste Management between Korea and Japan, 0 Pages, 2000/00

None

Journal Articles

A Modeling Study of General Corrosion of Copper Overpack for Geological Isolation of High-Level Radioactive Waste

; Taniguchi, Naoki; Ishikawa, Hirohisa

Materials Research Society Symposium Proceedings, Vol.556, p.911 - 918, 1999/00

None

Journal Articles

None

Ishikawa, Hirohisa; Honda, Akira; Taniguchi, Naoki

MRS '98Fall Meeting Syposium QQ Scientific for Nuc, 0 Pages, 1998/11

None

Journal Articles

Entry project: Bridging gaps between existing laboratory and field studies for performance

Ishikawa, Hirohisa; ; Umeki, Hiroyuki; Miyahara, Kaname;

Proceedings of 1998 International High-Level Radioactive Waste Management Conference, 0 Pages, 1998/01

None

Journal Articles

Status of the high-level radioactive waste disposal programme in Japan

Umeki, Hiroyuki; ; ; Yamakawa, Minoru; Ishikawa, Hirohisa

Proceedings of 19th Annual Conference of the Canadian Nuclear Society, p.74 - 81, 1998/00

None

98 (Records 1-20 displayed on this page)