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Journal Articles

Reclamation of highly radioactive contaminated soil by a combination of chemical interface controlled dispersion and high-speed shearing washing

Ishiyama, Shintaro; Mamitani, Masataka*; Kondo, Mitsunori*; Hiki, Akinori*

Kagaku Kogaku Rombunshu, 39(6), p.545 - 552, 2013/11

 Times Cited Count:3 Percentile:15.82(Engineering, Chemical)

Chemical interface controlled dispersion and high speed shearing (CDS) washing verification test of high level radioactive contaminated soil over 570,000 Bq/kg was conducted using three kinds of radioactive contaminated soils of school ground, moor and road in Fukushima and the following results was obtained. (1) Washing rate of three kinds of contaminated soils reached up to 60-98% after 60 minutes CDS water washing. (2) Recovered amounts of reclamation soils of three type of soils(less than 8,000 Bq/kg) were 60-82 wt.%. Especially, 506 Bq/kg $$times$$ 33wt.% was achieved in the case of contaminated soil of moor. (3) Volume reductions of 60-85wt.% were achieved in every case of contaminated soils. (4) Contain recoverable quantities of total radioactive sources contained in soils was over 90%. (5) Main FP trapping minerals contained in contaminated soil of school ground is lamellar silicate and that of moor and road is mordenite.

Journal Articles

Volume reduction effect of radioactive contaminated soil by high temperature heating process

Ishiyama, Shintaro; Mamitani, Masataka*; Kondo, Mitsunori*; Hiki, Akinori*

Nihon Kikai Gakkai Rombunshu, A, 79(806), p.1504 - 1516, 2013/10

For the purpose of removal of $$^{137}$$Cs from highly densified contaminate soil produced after contaminated soil washing process, reclamation soil techniques of contaminated soil through use of structural instability of mordenite contained in contaminated soil under high temperature heating was testified and the following results were obtained; (1) Structural instability of Cs-typed typical native mordinite yielding in Tohoku area in Japan was observed and dissociation of $$^{137}$$Cs from this mordenite was found after heat annealing at 1173 K. (2) Remarkable dissociation rate in the early stages was observed and then was slowed down afterword. Dissociation rate of $$^{137}$$Cs reached up to 65% after 1173 K $$times$$ 1 hr annealing. (3) 100% recovery of Cs from vaporized Cs gas was achieved by technology combination of electric precipitation FP filter newly developed and cold trap.

Journal Articles

Chemical interface controlled dispersion and high-speed shearing washing techniques for radioactive contaminated soil; 4th report of field test in Fukushima

Ishiyama, Shintaro; Mamitani, Masataka*; Kondo, Mitsunori*

Nihon Kikai Gakkai 2013-Nendo Nenji Taikai Koen Rombunshu (DVD-ROM), 5 Pages, 2013/09

Chemical interface controlled dispersion and high speed shearing (CDS) washing verification test of high level radioactive contaminated soil over 570,000 Bq/kg was conducted using three kinds of radioactive contaminated soils of school ground, moor and road in FUKUSHIMA and the following results was obtained. (1) Washing rate of three kinds of contaminated soils reached up to 60$$sim$$98% after 60minitues CDS water washing. (2) Recovered amounts of reclamation soils of three type of soils ($$<$$ 8,000Bq/kg) were 60$$sim$$82wt.%. Especially, 506 Bq/kg $$times$$33wt.% was achieved in the case of contaminated soil of moor. (3) Volume reductions of 60$$sim$$85wt% were achieved in every case of contaminated soils. (4) Contain recoverable quantities of total radioactive sources contained in soils was over 90%. (5) Main FP trapping minerals contained in contaminated soil of school ground is lamellar silicate and that of moor and road is mordenite.

Journal Articles

Decontamination of soil washing machines in high level radioactive contaminated soil processing by ceramic thin coating with ion plating technique

Ishiyama, Shintaro; Mamitani, Masataka*; Kondo, Mitsunori*; Hiki, Akinori*

Kagaku Kogaku Rombunshu, 39(4), p.405 - 410, 2013/07

 Times Cited Count:3 Percentile:15.82(Engineering, Chemical)

Ion plating ceramic coating technique was applied for prevention of radioactive contamination and attrition of chemical interface controlled dispersion and high speed shearing washing machine during water washing with high level radioactive contaminated soil over 570,000 Bq/kg and the following results were obtained. (1) No contamination of Al$$_{2}$$O$$_{3}$$ courted coupon with 5 $$mu$$m thickness installed in plunger was found after 3 hours water washing process of slurry contained 50% contaminated soil and uniformed attrition of the coating surface was observed, whereas contamination of SUS coupon due to FP particle attack and implantation during washing was observed. This contamination source is attached to SUS surface and not removable. (2) Attrition rate of surface of coated coupon during washing was estimated as 0.14 $$mu$$m/hr in the case of installation on rotor of plunger and attrition of SUS exhibits 7 times higher than that of coated coupon in initial stage of washing process.

Journal Articles

New combination washing approach of chemical interface controlled dispersion and high-speed shearing washing techniques for radioactive contaminated soil; 1st report of field test in Fukushima

Ishiyama, Shintaro; Mamitani, Masataka*; Kondo, Mitsunori*

Nihon Kikai Gakkai Rombunshu, B, 79(802), p.1106 - 1121, 2013/06

Contaminated soil washing test was implemented in Fukushima for the purpose of performance verification and set-up of engineering database for construction of contaminated soil washing plant. Chemical interface controlled dispersion approach and high-speed shearing washing techniques were applied to wash the contaminated soil over 10000 Bq/kg and the following results were obtained in this first field test (1) Remarkable washing performance was achieved under the combination of dispersion and high-speed shearing washing conditions with bead cracking technique in the particle grain size group over 0.5 mm and enhanced by ceramic bead addition. (2) Well-ordered structural refinement and cumulation of the contaminated soil particle groups with strong FP confinement were observed at the particle size of 0.5 to 10 $$mu$$m after washing the contaminated soil particle group under 0.5 mm, and sieve classification technique can be applied for elective elimination of this soil particle groups.

JAEA Reports

Development of fabrication technology for ITER vacuum vessel

Nakahira, Masataka; Shibanuma, Kiyoshi; Kajiura, Soji*; Shibui, Masanao*; Koizumi, Koichi; Takeda, Nobukazu; Kakudate, Satoshi; Taguchi, Ko*; Oka, Kiyoshi; Obara, Kenjiro; et al.

JAERI-Tech 2002-029, 27 Pages, 2002/03

JAERI-Tech-2002-029.pdf:2.04MB

The ITER vacuum vessel (VV) R&D has progressed with the international collaborative efforts by the Japan, Russia and US Parties during the Engineering Design Activities (EDA). Fabrication and testing of a full-scale VV sector model and a port extension have yielded critical information on the fabrication and assembly technologies of the vacuum vessel, magnitude of welding distortions, dimensional accuracy and achievable tolerances during sector fabrication and field assembly. In particular, the dimensional tolerances of $$pm$$3 mm for VV sector fabrication and $$pm$$10 mm for VV sector field assembly have been achieved and satisfied the requirements of $$pm$$5 mm and $$pm$$20 mm, respectively. Also, the basic feasibility of the remote welding robot has been demonstrated. This report presents detailed fabrication and assembly technologies such as welding technology applicable to the thick wall without large distortion, field joint welding technology between sectors and remote welding technology through the VV R&D project.

Oral presentation

Rationalization of remote maintenance equipment for ITER blanket

Takeda, Nobukazu; Kakudate, Satoshi; Shibanuma, Kiyoshi; Tsuji, Koichi*; Kubo, Tomomi*; Maruyama, Kensuke*; Kondo, Mitsunori*

no journal, , 

no abstracts in English

Oral presentation

Reclanation technique of radiation contaminated soil

Ishiyama, Shintaro; Mamitani, Masataka*; Kondo, Mitsunori*; Hiki, Akinori*

no journal, , 

Contaminated soil washing test was implemented in Fukushima for the purpose of performance verification and set up of engineering database for construction of contaminated soil washing plant and the following results were obtained in this first field test. (1) Dispersion of the radioactive contaminated soil over 10,000 Bq/kg was enhanced in alkalized washing solution at base equilibrium point of pH=10.1$$sim$$10.5. (2) Remarkable washing performance was achieved under the combination of dispersion and high speed shearing washing conditions. (3) Remarkable well ordered structural refinement and cumulation of the contaminated soil particle groups with strong FP confinement were observed at the particle size of 0.5$$sim$$10 $$mu$$m after washing the contaminated soil particle grain size under 0.5 mm, and sieve classification technique can be applied for elective elimination of this soil particle groups.

Oral presentation

Chemical interface controlled dispersion and high-speed shearing washing techniques for radioactive contaminated soil

Ishiyama, Shintaro; Mamitani, Masataka*; Kondo, Mitsunori*

no journal, , 

Chemical interface controlled dispersion and high-speed shearing water washing tests were carried out with highly radioactive contaminated soil of over 570,000 Bq/kg in Fukushima. In present experiment, ion plating Al$$_{2}$$O$$_{3}$$ ceramic coating was applied to SUS304 substrate material for prevention of radioactive contamination, and its erosion and decontamination performance were assessed. The following results were obtained. (1) Adhesion of fission product (FP) contained in refined soil particles was observed on the surface of SUS304 test coupons coated with 5 $$mu$$m of Al$$_{2}$$O$$_{3}$$. In wipe-out tests, contaminated soil particles were easily removed from the surface of Al2O3 coated test coupon, whereas contaminated soil particles were tightly bound to the surface of uncoated SUS coupons.

Oral presentation

Reclamation of irradiation contaminated soil by supercritical fluid washing technique

Ishiyama, Shintaro; Mamitani, Masataka*; Kondo, Mitsunori*

no journal, , 

Contaminated soil washing verification test was planted on the base of engineering database obtained by our previous report and implemented in Fukushima for the purpose of performance verification of irradiation contaminated soil washing scale-down plant. Chemical interface controlled dispersion approach and high-speed shearing water washing and supercritical CO$$_{2}$$ washing techniques were applied to wash highly contaminated soil over 10,000 Bq/kg at moor and the following results were obtained. (1) Over 85% volume reduction of contaminated soil and condensation up to 37,000 Bq/kg were achieved in the volume reduction process. (2) The collection rate of reclamation soil under 500 Bq/kg after washing process reached up to 30% and to be enhanced through the improvement of retention of soil in the process. (3) Mineral mordenite contained in contaminated soil is one of main contaminant source.

10 (Records 1-10 displayed on this page)
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