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Journal Articles

Precipitation of minerals on rock kept in water with different calcium ion concentrations

Nara, Yoshitaka*; Kuwatani, Ryuta*; Kono, Masanori*; Sato, Toshinori; Kashiwaya, Koki*

Zairyo, 67(7), p.730 - 737, 2018/07

Information of confining ability of rock is important for the geological disposal of radioactive wastes. To maintain or improve the confining ability of rocks, it is important to seal pores and cracks. In this study, we investigated the precipitation of minerals on the rock surface. As rock samples, we used Berea sandstone and Toki granite in this study. It was shown that precipitation occurred on the surface of rock specimens kept in calcium hydroxide solution for 1 month if the concentration was high. Specifically, if the concentration of calcium hydroxide solution was higher than 300 mg/l, the precipitation occurred obviously. After keeping rock specimens in calcium hydroxide solution, the weight of the rock samples increased and the concentration of calcium ion decreased by the precipitation. It is considered that the calcium ion in water was used for the precipitation on rock surfaces. Since the precipitation has been recognized for rock surfaces, it is possible to seal pores and cracks in rocks. Therefore, it is also possible to keep or decrease the permeability of rocks by the precipitation of calcium compounds.

JAEA Reports

Stabilization of MOX dissolving solution at STACY

Kobayashi, Fuyumi; Sumiya, Masato; Kida, Takashi; Kokusen, Junya; Uchida, Shoji; Kaminaga, Jota; Oki, Keiichi; Fukaya, Hiroyuki; Sono, Hiroki

JAEA-Technology 2016-025, 42 Pages, 2016/11

JAEA-Technology-2016-025.pdf:17.88MB

A preliminary test on MOX fuel dissolution for the STACY critical experiments had been conducted in 2000 through 2003 at Nuclear Science Research Institute of JAEA. Accordingly, the uranyl / plutonium nitrate solution should be reconverted into oxide powder to store the fuel for a long period. For this storage, the moisture content in the oxide powder should be controlled from the viewpoint of criticality safety. The stabilization of uranium / plutonium solution was carried out under a precipitation process using ammonia or oxalic acid solution, and a calcination process using a sintering furnace. As a result of the stabilization operation, recovery rate was 95.6% for uranium and 95.0% for plutonium. Further, the recovered oxide powder was calcined again in nitrogen atmosphere and sealed immediately with a plastic bag to keep its moisture content low and to prevent from reabsorbing atmospheric moisture.

Journal Articles

Development of a simple reprocessing process using selective precipitant for uranyl ions; Precipitation behaviors of plutonium and other transuranium elements

Morita, Yasuji; Kawata, Yoshihisa*; Mineo, Hideaki; Koshino, Nobuyoshi*; Asanuma, Noriko*; Ikeda, Yasuhisa*; Yamasaki, Kazuhiko*; Chikazawa, Takahiro*; Tamaki, Yoshihisa*; Kikuchi, Toshiaki*

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

N-cyclohexyl-2-pyrrolidone (NCP) can selectively precipitate U(VI) ions in aqueous nitric acid solutions. Utilizing this property, we have been developing a simple reprocessing process of spent nuclear fuel based only on precipitation method. In the first precipitation step, only U is separated by precipitation in a yield of about 70%, and in the second precipitation step both U and Pu are recovered and separated from fission products (FP) and other transuranium elements (TRU). In JAERI, precipitation behaviors of Pu and other TRU were examined experimentally, and the results showed the feasibility of the process establishement.

Journal Articles

Development of a simple reprocessing process using selective precipitant for uranyl ions; Engineering studies for precipitating and separating systems

Yamasaki, Kazuhiko*; Chikazawa, Takahiro*; Tamaki, Yoshihisa*; Kikuchi, Toshiaki*; Morita, Yasuji; Kawata, Yoshihisa*; Mineo, Hideaki; Koshino, Nobuyoshi*; Asanuma, Noriko*; Harada, Masayuki*; et al.

Proceedings of International Conference on Nuclear Energy System for Future Generation and Global Sustainability (GLOBAL 2005) (CD-ROM), 4 Pages, 2005/10

N-cyclohexyl-2-pyrrolidone (NCP), can selectively precipitate U(VI) ions in aqueous nitric acid solutions. Utilizing this property, we have been developing a simple reprocessing process of spent nuclear fuel based only on precipitation method. In the first precipitation step, only U is separated by precipitation in a yield of about 70%, and in the second precipitation step both U and Pu are recovered and separated from fission products (FP) and other transuranium elements (TRU). In the present study, a precipitator and a precipitate separator were designed and built up, and were tested with aspets of operationability and system performance.

JAEA Reports

Research and development on partitioning in JAERI; Review of the research activities until the development of 4-group partitioning process

Morita, Yasuji; Kubota, Masumitsu*

JAERI-Review 2005-041, 35 Pages, 2005/09

JAERI-Review-2005-041.pdf:2.24MB

Research and development on Partitioning in JAERI are reviewed in the present report from the beginning to the development of the 4-Group Partitioning Process and its test with real high-level liquid waste (HLLW). In the 3-Group Partitioning Process established in around 1980, elements in HLLW are separated into 3 groups of transuranium element group, Sr-Cs group and the other element group. The 4-Group Partitioning Process subsequently developed contains the separation of Tc-platinum group metals additionally. The process was tested to demonstrate its performance with real concentrated HLLW. Until then, various separation methods for various elements were studied and selection and optimization of the separation methods were carried out to establish the process. Review of the experience, findings and results is very important and valuable for future study on partitioning. The present report is prepared from this point of view.

Journal Articles

Improvement of Worldwide version of System for Prediction of Environmental Emergency Dose Information (WSPEEDI), 2; Evaluation of numerical models by $$^{137}$$Cs deposition due to the Chernobyl nuclear accident

Terada, Hiroaki; Chino, Masamichi

Journal of Nuclear Science and Technology, 42(7), p.651 - 660, 2005/07

 Times Cited Count:13 Percentile:28.49(Nuclear Science & Technology)

The prediction performance of WSPEEDI (Worldwide version of System for Prediction of Environmental Emergency Dose Information), which consists of the atmospheric dynamic model MM5 and the Lagrangian particle dispersion model GEARN-new, is evaluated by measurements of precipitation and surface deposition of $$^{137}$$Cs over Europe during the Chernobyl accident. It is concluded that MM5/GEARN-new can predict $$^{137}$$Cs deposition distribution with good accuracy when accurate precipitation is predicted by using a explicit scheme on cloud microphysics with ice phase processes. High-resolutional calculation is also conducted for the area surrounding Chernobyl by a nesting method. MM5/GEARN-new can predict quite a realistic distribution of $$^{137}$$Cs deposition around Chernobyl which was not calculated by the previous version.

Journal Articles

Hardening of Fe-Cu alloys by swift heavy ion irradiation

Iwase, Akihiro; Hasegawa, Tadayuki*; Chimi, Yasuhiro; Tobita, Toru; Ishikawa, Norito; Suzuki, Masahide; Kambara, Tadashi*; Ishino, Shiori*

Nuclear Instruments and Methods in Physics Research B, 195(3-4), p.309 - 314, 2002/10

 Times Cited Count:12 Percentile:34.09

no abstracts in English

Journal Articles

Hardening of Fe-Cu alloys at elevated temperatures by electron and neutron irradiations

Tobita, Toru; Suzuki, Masahide; Iwase, Akihiro; Aizawa, Kazuya

Journal of Nuclear Materials, 299(3), p.267 - 270, 2001/12

 Times Cited Count:19 Percentile:15.12

no abstracts in English

Journal Articles

Ion beam analysis of precipitation process in immiscible system prepared by ion implantation

Naramoto, Hiroshi; Yamamoto, Shunya; Narumi, Kazumasa

JAERI-Review 99-025, TIARA Annual Report 1998, p.191 - 192, 1999/10

no abstracts in English

Journal Articles

Development of a moist atmospheric dynamic model for nuclear emergency response

Furuno, Akiko; Yamazawa, Hiromi

Mathematics and Computation, Reactor Physics and Environmental Analysis in Nuclear Applications, 2, p.1699 - 1704, 1999/00

no abstracts in English

Journal Articles

Nonuniformity effect on reactivity of fuel in slurry

; *

Nuclear Technology, 122(3), p.265 - 275, 1998/00

 Times Cited Count:1 Percentile:83.29(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Quantitative performance allocation of multi-barrier system for high-level radioactive waste disposal

*; *; *; *; Sakamoto, Yoshiaki; *; *; ; Nagasaki, Shinya*; *; et al.

Nippon Genshiryoku Gakkai-Shi, 37(1), p.59 - 77, 1995/00

 Times Cited Count:12 Percentile:23.33(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Application of an advanced incineration technique to spent solvent treatment for improving the waste management

Uchiyama, Gunzo; Maeda, Mitsuru; *; Fujine, Sachio; *; *

Proceedings of 4th International Conference on Nuclear Fuel Reprocessing and Waste Management; RECOD '94, Vol.3, 0, p.1 - 15, 1994/00

no abstracts in English

Journal Articles

Applications of photoacoustic spectroscopy to speciation of lanthanide elements in aqueous solutions and of solid phase

; Kimura, Takaumi

Journal of Nuclear Science and Technology, 28(8), p.780 - 783, 1991/08

no abstracts in English

Journal Articles

Coprecipitation of plutonium with magnetite and ferrite

Radioisotopes, 35(11), p.571 - 576, 1986/11

no abstracts in English

Journal Articles

Hybrid-Log-Normal distribution and its applications

Kumazawa, Shigeru; *

Oyo Tokeigaku, 15(1), p.1 - 14, 1986/00

no abstracts in English

JAEA Reports

Meteorological Statistics at the Site of Tokai Research Establishment (1964$$sim$$1982)

; ; ; ;

JAERI-M 83-201, 40 Pages, 1983/11

JAERI-M-83-201.pdf:1.07MB

no abstracts in English

Journal Articles

Precipitation of thorium or uranium(VI)complex ion with cobalt(III)or chromium(III)complex cation, 5; Precipitation of uranium(VI)malato and edta complex ion

;

Journal of Nuclear Science and Technology, 17(5), p.370 - 376, 1980/00

 Percentile:100(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Coprecipitation of the lanthanide and actinide elements with some carbonato and sulfato complexes

*; *;

Radiochem.Radioanal.Lett., 43(4), p.203 - 214, 1980/00

no abstracts in English

JAEA Reports

Glass Apparatuses for the Production of Processed Radioisotopes

JAERI-M 6390, 27 Pages, 1976/02

JAERI-M-6390.pdf:1.13MB

no abstracts in English

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