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Journal Articles

Development of calculation methodology for estimation of radionuclide composition in wastes generated at Fukushima Daiichi Nuclear Power Station

Sugiyama, Daisuke*; Nakabayashi, Ryo*; Koma, Yoshikazu; Takahatake, Yoko; Tsukamoto, Masaki*

Journal of Nuclear Science and Technology, 56(9-10), p.881 - 890, 2019/09

 Times Cited Count:4 Percentile:35.01(Nuclear Science & Technology)

Journal Articles

Introduction to radioactive waste; Management of radioactive waste from operation and decommissioning of nuclear and other facilities, 2; Perspective radioactive waste management

Akiyama, Kazuki; Takahashi, Masanori; Tsukamoto, Masaki*; Miyauchi, Yoshihiro*; Wada, Hiroshi*

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 56(10), p.656 - 660, 2014/10

This report shows the yield of low-level radioactive wastes and high-level radioactive wastes at the nuclear power plant and reprocessing plant, and those detailed managements are reported.

Journal Articles

Progress in Japan's TRU waste disposal technologies on the generic research and development ophase

Shiotsuki, Masao; Kuroda, Shigeki*; ; Honda, Akira; Mihara, Morihiro; Ono, Fumihiko*; Kozawa, Takashi*; Tsukamoto, Masaki*

IAEA-CN-135/59, p.229 - 232, 2005/10


JAEA Reports

An Estimation of microorganisms impacts on geological disposal system for TRU waste.

Kato, Takashi; Honda, Akira; Nakanishi, Hiroshi; Inagaki, Manabu; Tsukamoto, Masaki*

JNC TN8400 2005-022, 52 Pages, 2005/09


(1) The denitrifying bacteria, the sulfate restoration bacteria, the methanation bacteria and the organic substrate (the cement admixture, the cellulose and the asphalt, TBP) decomposing bacteria were extracted as the important microbes which can be active on the basis of both previous studies on the microbes in deep underground and coexisting substrate. (2) The total amount of calcium hydrate in the repository exceeded the equivalent amount of that for reacting the total Co$$_{2}$$ generated from microbial decomposition of organic substrate and phosphate generated from the microbial decomposition of TBP. Therefore, the impacts of lowering pH by the metabolic products was not considered to be significant. Furthermore, impacts of alteration of both bentonite and cementitious materials and metal corrosion due to the drop of pH are not considered to be significant. (3) The N$$_{2}$$ gas evolution rate due to the denitrifying reaction by microorganisms dominated the total gas evolution rate, if time dependent reduction of corrosion rate was employed. However, the H$$_{2}$$ gas evolution rate in the case is similar to those of N$$_{2}$$ gas due to the denitrifying reaction mentioned above, if time dependent reduction of corrosion rate was neglected. (4) The information of the impacts of the complex formation between nuclides and metabolic products of microbes, colloid formation (including the colloidal behavior of microbes) and $$^{14}$$CH$$_{4}$$ formation due to microbial activities is limited. The impacts are also considered to depend on the site character. Therefore the limited availability of information and site dependency prevent us from assessing the previous impacts at present. The further accumulation of knowledge is necessary for the assessments.

Journal Articles

Report on investigation of unexpected reactor shutdown of the TRACY facility; Cause and countermeasures

Sono, Hiroki; Tsukamoto, Michio; Aizawa, Eiju; Takeuchi, Masaki; Fukaya, Yuji; Iseda, Hirokatsu*; Ogawa, Kazuhiko; Sakuraba, Koichi; Tonoike, Kotaro

UTNL-R-0446, p.3_1 - 3_10, 2005/03

This report describes an investigation and countermeasures of the unexpected reactor shutdown of the TRACY facility at the Japan Atomic Energy Research Institute on June 17, 2004, caused by a malfunction of a safety rod of the facility. As a result of the investigation, the principal cause of the malfunction was ascribed to a drop in attraction of a binding magnet for the safety rod by a small piece of a foreign material. The following countermeasures were taken against its recurrence: prevention of incidence of foreign materials, reduction of the chance of intrusion of foreign materials into devices, and certain detection of foreign materials. This lesson learned through the experience is expected to be shared with the staffs concerned in reactor operation and maintenance.

JAEA Reports

Report of TRACY operation

Aizawa, Eiju; Ogawa, Kazuhiko; Sakuraba, Koichi; Tsukamoto, Michio; Sugawara, Susumu; Takeuchi, Masaki*; Miyauchi, Masakatsu; Yanagisawa, Hiroshi; Ono, Akio

JAERI-Tech 2002-031, 120 Pages, 2002/03


TRACY (Transient Experiment Critical Facility) in NUCEF (Nuclear Safety Research Facility) is the pulse-type critical facility using uranyl nitrate solution which can carry out various supercritical experiments changing reactivity addition up to 3$.TRACY achieved its first criticality on 20th December 1995,and transient operations have been conducted Since1996.This report summarizes the operation data of 176 experiments from the first criticality to FY2000.

Journal Articles

Outline of the Progress Report on Disposal Concept for TRU Waste in Japan

Hara, Keiji; Oda, Hideki*; Fujiwara, Hiroshi*; Tsukamoto, Masaki*; Mano, Tadashi

Genshiryoku Bakkuendo Kenkyu, 6(2), p.233 - 253, 2000/05


JAEA Reports

Cost Estimation for the Geological Disposal System of High Level Radioactive Waste (for 1989); The Improvement of Cost Integration System

Yoshiki, Nobuya*; Oe, Toshiaki*; Tsukamoto, Masaki*; Tanaka, Hiroshi*

JNC TJ1400 2005-003, 149 Pages, 1990/03



Oral presentation

Development of inventory evaluation methods for the radioactive wastes of Fukushima Daiichi Nuclear Power Station, 7; Comparison of inventory estimation methods for secondary wastes from contaminated water treatment system

Meguro, Yoshihiro; Kato, Jun; Oi, Takao; Koma, Yoshikazu; Ashida, Takashi; Sugiyama, Daisuke*; Nakabayashi, Ryo*; Fujita, Tomonari*; Tsukamoto, Masaki*; Uchiyama, Hideaki*; et al.

no journal, , 

Inventory evaluation results obtained by analytical results of contaminated water was compared with that obtained on the basis of an analytically-calculated method for the secondary wastes generated from the water treatment system such as the cesium adsorption device, the second cesium adsorption device and the coagulating sedimentation device in the Fukushima Daiichi Nuclear Power Station.

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