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Iketani, Shotaro; Yokobori, Tomohiko; Ishikawa, Joji; Yasuhara, Toshiyuki*; Kozawa, Toshiyuki*; Takaizumi, Hirohide*; Momma, Takeshi*; Kurosawa, Shingo*; Iseda, Hirokatsu; Kishimoto, Katsumi; et al.
JAEA-Review 2018-016, 46 Pages, 2018/12
JAEA-Review-2018-016.pdf:12.79MB
Japan Atomic Energy Agency (JAEA) adopts melting process for the waste processing and packaging method of radioactive miscellaneous solid waste in NSRI because melting process is effective in radioactivity evaluation, volume reduction, and stabilization treatment. Metal melting processing facilities, Incinerator, and Nonmetal melting processing facilities (hereinafter referred to as melting process facilities) have taken lots of safety measures, including measures for preventing the recurrence of the fire accidents. To exchange opinions and discuss the validity of these measures and so on with internal personnel and external experts, "Discussions on Melting Process Facilities" was held. As a document collection, this paper summarizes presentation materials of discussion meetings. Presentation materials describe "Outline of AVRF", "Safety measures in the melting facilities in WVRF", "Operation management of the melting facilities in WVRF", "Comparison of the past accident cases between facilities in and outside Japan and WVRF", and "Introduction of past accident cases and safety measures in other facilities from each committee".
Nakashio, Nobuyuki; Osugi, Takeshi; Iseda, Hirokatsu; Tohei, Toshio; Sudo, Tomoyuki; Ishikawa, Joji; Mitsuda, Motoyuki; Yokobori, Tomohiko; Kozawa, Kazushige; Momma, Toshiyuki; et al.
Journal of Nuclear Science and Technology, 53(1), p.139 - 145, 2016/01
Times Cited Count：1 Percentile：10.51(Nuclear Science & Technology)no abstracts in English
Uesaka, Takahiro; Kozawa, Masachiyo; Matsumoto, Junko; Endo, Masayuki; Kinoshita, Junichi; Suzuki, Takeshi; Suzuki, Hisao; Morishita, Satoru; Sakamoto, Yu
JAEA-Technology 2012-015, 29 Pages, 2012/06
JAEA-Technology-2012-015.pdf:3.22MB
In Japan Atomic Energy Agency Nuclear Science Research Institute waste treatment building No.2 treat intermediate-level solid waste. Solid wastes are reduced in volume by compaction. They are then canned in stainless can, which are subsequently put in 200-liter concrete-lined drums or 1-m
concrete containers, filled with concrete. To prepare for disposal in future, be able to make fit with the technical standard of waste package, we were asked to change the lid type shielded container. Therefore due to the change of lid type shielded container, we confirmed integrity of it with evaluation of close volt by drop analysis, evaluation of shielding, and drop test with a prototype model.
Sudo, Tomoyuki; Nakashio, Nobuyuki; Osugi, Takeshi; Mimura, Ryuji; Ishihara, Keisuke; Satomi, Shinichi; Myodo, Masato; Momma, Toshiyuki; Kozawa, Kazushige
JAEA-Technology 2010-041, 38 Pages, 2011/01
JAEA-Technology-2010-041.pdf:4.73MB
The super compactor in the AVRF treats compactible metal wastes mainly generated from research reactors in the Nuclear Science Research Institute of JAEA. Those wastes are compacted with the maximum about 2,000-ton force. The supercompacted wastes are packed into the container and then immobilized with cementitious materials. The solidified wastes (containing supercompacted wastes) become an object for near surface disposal with artificial barrier. For disposal, the solidified wastes must be satisfied the technical criteria. One of the important indicators is the void ratio in the solidified wastes. In this report, we manufactured the supercompacted wastes with the ordinary treatment method for actual wastes treated in the AVRF and immobilized with a mortar grout. The void ratio of the solidified wastes were evaluated in consideration for concrete vault disposal. As a result, We confirmed the integrity of the solidified wastes from a point of view of void ratio.
Tohei, Toshio; Nakashio, Nobuyuki; Osugi, Takeshi; Ishikawa, Joji; Mizoguchi, Takafumi; Hanawa, Ritsu; Someya, Keita*; Takahashi, Kenji*; Iseda, Hirokatsu; Kozawa, Kazushige; et al.
JAEA-Technology 2010-008, 28 Pages, 2010/06
JAEA-Technology-2010-008.pdf:5.0MB
The Waste Volume Reduction Facility (WVRF) was constructed for volume reduction and the chemical stabilization of the low level radioactive waste in the Nuclear Science Research Institute of JAEA. The metal melting system in the WVRF treats radioactive metal waste. From the experience of trial operations, the improvement has conducted on the casting process in the metal melting system. The performance of the improved casting process was verified through the trial operations from Oct. 2008. In this report, we describe the reduction of the processing time, of the utilities consumption, of the load of maintenance on the improved casting process.
Higuchi, Hidekazu; Osugi, Takeshi; Nakashio, Nobuyuki; Momma, Toshiyuki; Tohei, Toshio; Ishikawa, Joji; Iseda, Hirokatsu; Mitsuda, Motoyuki; Ishihara, Keisuke; Sudo, Tomoyuki; et al.
JAEA-Technology 2007-038, 189 Pages, 2007/07
JAEA-Technology-2007-038-01.pdf:15.13MBJAEA-Technology-2007-038-02.pdf:38.95MBJAEA-Technology-2007-038-03.pdf:48.42MBJAEA-Technology-2007-038-04.pdf:20.53MBJAEA-Technology-2007-038-05.pdf:10.44MB
The Advanced Volume Reduction Facilities (AVRF) is constructed to manufacture the waste packages of radioactive waste for disposal in the Nuclear Science Research Institute of the Japan Atomic Energy Agency. The AVRF is constituted from two facilities. The one is the Waste Size Reduction and Storage Facility (WSRSF) which is for reducing waste size, sorting into each material and storing the waste package. The other is the Waste Volume Reduction Facility (WVRF) which is for manufacturing the waste package by volume reducing treatment and stabilizing treatment. WVRF has an induction melting furnace, a plasma melting furnace, an incinerator, and a super compactor for treatment. In this report, we summarized about the basic concept of constructing AVRF, the constitution of facilities, the specifications of machineries and the state of trial operation until March of 2006.
Higashinaka, Motonori*; Sano, Yukiko*; Kozawa, Takeshi*
JNC TJ5410 2005-009, 96 Pages, 2005/08
JNC-TJ5410-2005-009.pdf:36.66MB
This document is to report the result of existing seismic data reprocessing around Horonobe town, Hokkaido, Japan, which is a part of the Horonbe Undergounrd Research Project. The main purpose of the re-processing is to recognize the subsurface structure of Omagari Fault and fold sysytem around Omagari Fault. The seismic lines fore re-processing are TYHR-A3 and SHRB-2line, which is surceyed in 1975. Applying weathering static correction using refraction analysis and noise suprression procedure, we have much enhanced sesmic prifile.
Yokobori, Tomohiko; Osugi, Takeshi; Hanawa, Ritsu; Ito, Keisuke; Kozawa, Kazushige; Akabori, Mitsuo; Okamoto, Yoshihiro; Okoshi, Minoru
no journal, ,
no abstracts in English
Osugi, Takeshi; Hanawa, Ritsu; Ito, Keisuke; Yokobori, Tomohiko; Kozawa, Kazushige; Akabori, Mitsuo; Okamoto, Yoshihiro; Meguro, Yoshihiro; Okoshi, Minoru
no journal, ,
By the addition of clay minerals during the incineration plant residues, indicating that the Cs concentration in the fly ash and fly ash amount is suppressed.
Osugi, Takeshi; Hanawa, Ritsu; Ito, Keisuke; Kozawa, Kazushige; Okamoto, Yoshihiro; Akabori, Mitsuo; Okoshi, Minoru
no journal, ,
no abstracts in English
in soilOsugi, Takeshi; Hanawa, Ritsu; Ito, Keisuke; Kozawa, Kazushige; Akabori, Mitsuo; Okamoto, Yoshihiro; Okoshi, Minoru; Nakashima, Kunihiko*; Saito, Noritaka*
no journal, ,
no abstracts in English
Osugi, Takeshi; Nakashio, Nobuyuki; Iseda, Hirokatsu; Hanawa, Ritsu; Kozawa, Kazushige; Momma, Toshiyuki
no journal, ,
no abstracts in English
Ishikawa, Joji; Nakashio, Nobuyuki; Osugi, Takeshi; Iseda, Hirokatsu; Mizoguchi, Takafumi; Kozawa, Kazushige; Momma, Toshiyuki
no journal, ,
no abstracts in English
Nakashio, Nobuyuki; Osugi, Takeshi; Iseda, Hirokatsu; Sudo, Tomoyuki; Kozawa, Kazushige; Momma, Toshiyuki
no journal, ,
no abstracts in English
Kuwahara, Akira; Osugi, Takeshi; Hanawa, Ritsu; Ito, Keisuke; Nakashio, Nobuyuki; Kozawa, Kazushige; Meguro, Yoshihiro; Akabori, Mitsuo; Okamoto, Yoshihiro; Nakashima, Kunihiko*; et al.
no journal, ,
In order to obtain the knowledge about cesium accumulations into the refractory in ash melting of decontamination waste, the immersion test was worked by immersing the refractory into melting slug including cesium, and cesium chemical forms in the refractory were analyzed.
Osugi, Takeshi; Hanawa, Ritsu; Yokobori, Tomohiko; Kozawa, Kazushige; Akabori, Mitsuo; Okamoto, Yoshihiro; Okoshi, Minoru
no journal, ,
The number and distribution of exhaust particles from incineration process of a plant body were investigated for the purpose of carring out volume reduction of decontamination wastes such as a plant matter.
Osugi, Takeshi; Hanawa, Ritsu; Ito, Keisuke; Kuwahara, Akira; Nakashio, Nobuyuki; Kozawa, Kazushige; Nakashima, Kunihiko*; Saito, Noritaka*; Okoshi, Minoru
no journal, ,
no abstracts in English
