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Sugaya, Atsushi; Tanaka, Kenji; Akutsu, Shigeru
Proceedings of International Waste Management Symposia 2011 (WM2011) (CD-ROM), 11 Pages, 2011/02
The main component of the liquid wastes is sodium nitrate. Nitrate ion decomposition technology is under development to conserve a circumference environment of a disposal site. To investigate the methods for decomposing nitrate ion, several small-scale trials were performed using reductants and a catalyst in sodium nitrate solutions. It will be reported that the cement based encapsulation trials to immobilize the sodium carbonate based liquid waste, which was performed under non-radioactive condition at both small and full scale to investigate the optimum cement formulation.
Horiguchi, Kenichi; Sugaya, Atsushi; Saito, Yasuo; Tanaka, Kenji; Akutsu, Shigeru; Hirata, Toshiaki
Proceedings of 2009 International Congress on Advances in Nuclear Power Plants (ICAPP '09) (CD-ROM), p.9411_1 - 9411_9, 2009/05
The low-level radioactive Waste treatment Facility (LWTF) was constructed at the Tokai Reprocessing Plant (TRP) and cold test has been carried out since 2006. The waste which is treated in the LWTF is combustible/incombustible solid waste and liquid waste. In the LWTF, The combustible/incombustible solid waste will be incinerated. The liquid waste will be treated by the radio-nuclides removal process subsequently solidified by cement materials. This report describes the essential technologies of the LWTF and results of R&D work for the nitrate-ion decomposition technology for the liquid waste.
Kobayashi, Kentaro; Akutsu, Shigeru; Sasayama, Yasuo; Nakanishi, Masahiro; Ozone, Takashi; Tomomi, Terunuma,; Mogaki, Isao*
JNC TN8440 2005-007, 138 Pages, 2005/07
JNC-TN8440-2005-007.pdf:7.47MB
This document is announced about the task of Waste Management Section of Waste Management Division in 2003. Mainly, our tasks are fractionating, incinerating and storing low active solid waste and storing high active solid waste. In addition, we are performing required correspondence about management program of low level waste. We had treated and stored waste safely according to our plan. As a result, we have achieved following outcomes. 1. We incinerated the combustible low active solid waste that is generated by the operation of Tokai Reprocessing Plant and the recovery operation of incident at Low Active Liquid Waste Asphalt Solidification Facility. Waste of this recovery operation is stored in the 2nd Low Active Liquid Waste Asphalt Solidification Storage Facility. We incinerated 58 ton of wastes. 2. We stored low active solid waste 854 drums that accommodate 200L. According to the time of Low-Level Waste Treatment Facility completion, we will be able to avoid full of storage. 3. We stored high active solid waste of 148 drums that accommodate 200L. For the time being, there is no problem as regards the administration of storage facility. 4. We carried out the management program of low level solid waste according to plan.
Sakakibara, Tetsuro; Tsutomu, Tanabe,; Takahashi, Kuniaki; Akutsu, Shigeru; Kojima, Hiroshi; Sakashita, Akira*; Kuroda, Kazuhiko*
Proceedings of International Waste Management Symposium 2005 (WM 2005), 0 Pages, 2005/00
Focusing on the cover layer materials (as the Radon Barrier Materials), which could have the effect to restrain the radon from scattering into the air and the effect of the radiation shielding, we produced the radon barrier materials with crude bentonite on an experimental basis, using the rotary type comprehensive unit for grinding and mixing, through which we carried out the evaluation of the characteristics thereof.
Kobayashi, Kentaro; Isozaki, Koei; Akutsu, Shigeru; Nakanishi, Masahiro; Ozone, Takashi; Mogaki, Isao*; Aizawa, Shuichi*
JNC TN8440 2004-001, 151 Pages, 2004/05
JNC-TN8440-2004-001.pdf:88.84MB
This document is announced about task of Waste Management Section in the 2003 fiscal year.
; ; Akutsu, Shigeru; Nakanishi, Masahiro
Proceedings of 8th International Conference on Radioactive Waste Management and Environmental Remediation (ICEM '01) (CD-ROM), P. 57, 2001/00
None
*; Miyo, Hiroaki*; Ouchi, Jin; *; *; Akutsu, Shigeru*
PNC TN841 76-53, 19 Pages, 1976/08
(IAEA/NEA Internatisnal symposium on the management of radioactive waster from the nuclear fuel cycle Vienne from 22 to 26 March 1976 *757) A summary is presented concerning the experiene in the management of Pu contaminated wastes at the plutonium fuel facilities of the power reactor and nuclear fuel development corporation (P.N.C). Description are given of waste generation, current handling techniques, Pu measurement techniques and process techniques now under research and development such as incineration system and a closed cycle liquid waste treatment by using decomposition of ammonium nitrate contined in the liquid.
Akutsu, Shigeru*; *; *;
PNC TN841 76-51, 10 Pages, 1975/06
It must be provided for the mass criticality control to keep accurate materialaccountancy and control in facility where signlficant amounts of fissile materials are processed. The computerized accountancy and control system was applied into the plutonium facility of PNC and has been improved according to the accumulation of fabrication experience. This system is being operated on realtime basis and alsois very useful for the safeguards requirements. The cource data for MUF analysis activities are obtained by processing the PIT data. The requirements, structures and operational method of this system will be described in this paper.
Sakakibara, Tetsuro; Kohanawa, Osamu; Akutsu, Shigeru; Kojima, Hiroshi; Sakashita, Akira*; Kuroda, Kazuhiko*; Kino, Kenichiro*; Saigusa, Moriyuki*
no journal, ,
no abstracts in English
Kino, Kenichiro*; Saigusa, Moriyuki*; Sakashita, Akira*; Kuroda, Kazuhiko*; Sakakibara, Tetsuro; Kohanawa, Osamu; Akutsu, Shigeru; Kojima, Hiroshi
no journal, ,
no abstracts in English
Sugaya, Atsushi; Horiguchi, Kenichi; Tanaka, Kenji; Akutsu, Shigeru; Yamaguchi, Takashi*
no journal, ,
The chemical species which may have an influence on cement based encapsulation is included in low-radioactive effluent occurring from the Tokai reprocessing plant as a major ingredient or minor spices. In this matter, the results of the encapsulation trials at the 200L size that were carried out to confirm influence of minor spices in the slurry effluent which includes nitric acid as a major ingredient and sodium dihydrogen phosphate in the phosphate effluent is reported.
Horiguchi, Kenichi; Sugaya, Atsushi; Tanaka, Kenji; Akutsu, Shigeru
no journal, ,
no abstracts in English
Takano, Masato; Sugaya, Atsushi; Tanaka, Kenji; Akutsu, Shigeru; Egami, Hikari*
no journal, ,
no abstracts in English
Sugaya, Atsushi; Horiguchi, Kenichi; Saito, Yasuo; Tanaka, Kenji; Akutsu, Shigeru; Hirata, Toshiaki
no journal, ,
The Low-level radioactive Waste Treatment Facility (LWTF) was constructed at the Tokai Reprocessing Plant and cold testing has been performed since 2006. The aims of this facility are to provide safe, effective and economic treatment of the Waste. The wastes treated in the LWTF are combustible and incombustible solid waste and liquid waste. The problem of burning up incombustible waste is to generate chlorine gas which causes corrosion. The incinerator is made of corrosion resistant metal and uses cooling water to prevent corrosion. The radio-nuclides separation process is newly-introduced for low-level radioactive liquid waste to reduce the deep geological disposal cost. A large amount of nitrate in the liquid waste might cause the environmental pollution. Nitrate ion decomposition technology is under development. A cement based encapsulation method to immobilize those liquid wastes has been developed. The results of these R&D work will be adopted in the LWTF in the near future.
Sugaya, Atsushi; Horiguchi, Kenichi; Akutsu, Shigeru; Sasaki, Tadashi*
no journal, ,
A large amount of nitrate in the effluent occurring from the Tokai Reprocessing Plant might cause the environmental pollution. The effluent is planning to be encapsulated by cement after treated in the nitrate ion decomposition process using a reductant and catalyst. Cement based encapsulation trials for low-radioactive effluent from the nitrate decomposition process is reported.
Sugaya, Atsushi; Horiguchi, Kenichi; Akutsu, Shigeru
no journal, ,
A large amount of nitrate in the effluent occurring from the Tokai reprocessing plant might cause the environmental pollution. The effluent is planning to be encapsulated by cement after treated in the nitrate ion decomposition process using a reductant and catalyst. Cement based encapsulation trials for low-radioactive effluent from the nitrate decomposition process is reported.
Sugaya, Atsushi; Horiguchi, Kenichi; Akutsu, Shigeru; Sato, Junya; Nakayama, Takuya; Kawato, Yoshimi; Meguro, Yoshihiro
no journal, ,
Cement solidification of sludge produced from contaminated water treatment by a coagulating sedimentation device was studied. Effect of water-to-cement ratio, loading rate, and components in the sludge on curing was investigated using simulated sludge. We have performed R&D work to apply cement solidification to the sludge and evaluated characteristics of solidification process with an eye towards the disposal as a basic study of waste treatment technology to prepare for the case if the sludge storage ability is not completely under safe conditions based on the results of long-term storage measure study. The results from these studies demonstrate that the simulated sludge can be successfully encapsulated by ordinary cement. We will investigate an allowance against variation of sludge constituents and characteristics and study a dissolution behavior of cesium and hazardous component from the waste form in the future.
Sato, Junya; Nakayama, Takuya; Suzuki, Shinji; Tomioka, Osamu; Kawato, Yoshimi; Sugaya, Atsushi; Horiguchi, Kenichi; Akutsu, Shigeru; Meguro, Yoshihiro
no journal, ,
no abstracts in English
Nakayama, Takuya; Sato, Junya; Suzuki, Shinji; Tomioka, Osamu; Kawato, Yoshimi; Sugaya, Atsushi; Horiguchi, Kenichi; Akutsu, Shigeru; Meguro, Yoshihiro
no journal, ,
no abstracts in English
