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Journal Articles

Solvent extraction behaviors of minor nuclides in nuclear fuel reprocessing process

Uchiyama, Gunzo; Asakura, Toshihide; Hotoku, Shinobu; Mineo, Hideaki; Kamei, Kazushige; Watanabe, Makio; Fujine, Sachio

Journal of Radioanalytical and Nuclear Chemistry, 246(3), p.683 - 688, 2000/12

 Times Cited Count:9 Percentile:41.96(Chemistry, Analytical)

no abstracts in English

JAEA Reports

Study on the nuclide behavior in nuclear fuel recycling system

Fujii, Toshiyuki*; *

JNC-TJ9400 2000-003, 36 Pages, 2000/02

JNC-TJ9400-2000-003.pdf:1.36MB

For establishing a recycling system based on low-decontamination, the distribution behaviors of radionuclides in the process are essential information for the design of the system. Molybdenum and palladium are less radioactive fission products, but attention should be paid to them because they are likely to extremely affect the performance of the recycled fuels. In this context, in this study, the extraction behaviors of molybdenum and palladium under conditions of PUREX and TRUEX extraction process were experimentally studied, and their chemical mechanisms were discussed. In cojunction with the extraction experiments, absorption spectrometry was applied to identify the related species and the extraction mechanism. As a result, knowledge for the distribution characteristics of molybdenum and palladium in PUREX and TRUEX process was reinforced.

JAEA Reports

Study of assessing aqueous reprocessing process for the pipeless reprocessing plant

*; *; *; *; *

JNC-TJ9400 2000-001, 112 Pages, 2000/02

JNC-TJ9400-2000-001.pdf:6.67MB

The purpose of this study is to investigate the possibility of new reprocessing process for the purpose of introducing pipeless plant concept, where aqueous separation methods other than solvent extraction method are adopted in order to develop more economical FBR fuel (MOX fuel) reprocessing process. At it's first stage, literature survey on precipitation method, crystallization method and ion-exchange method was performed. Based on the results, following processes were candidated for pipeless reprocessing plant. (1)The process adopting crystallization method and peroxide precipitation method (2)The process adopting oxalate precipitation method (3)The process under mild aqueous conditions (crystallization method and precipitation method) (4)The process adopting crystallization method and ion-exchange method (5)The process adopting crystallization method and solvent extraction method The processes (1)$$sim$$(5) were compared with each others in terms of competitiveness to the conventional reference process, and merits and demerits were evaluated from the viewpoint of applicability to pipeless reprocessing plant, safety, economy, Efficiencies in consumption of Resources, non-proliferation, and, Operation and Maintenance. As a result, (1)The process adopting crystallization method and peroxide precipitation method was selected as the most reasonable process to pipeless plant. Preliminary criticality safety analyses, main process chemical flowsheet, main equipment list and layout of mobile vessels and stations were reported for the (1) process.

JAEA Reports

The Research on the behavior of the minor products in the PUREX Process

Koga, Jiro*; Shinzato, Takushi*

JNC-TJ8400 2000-054, 48 Pages, 2000/02

JNC-TJ8400-2000-054.pdf:1.23MB

The "STELLA" which is a tool for simulation of dynamical systems applied to the numerical simulation of the behavior of minor constituent, such as hydrazoic acid, forming and extinguishing on the operation of reprocessing process. The concentration of hydrazoic acid forming by the reaction of nitrite and hydrazine were determined by use of STELLA after the determination of concentration of main constituents by MIXSET-X. The results from simulation is shown that the STELLA is applicable to the numerical simulation of the behavior of minor constituent.

JAEA Reports

None

PNC-TN1000 98-004, 21 Pages, 1998/07

PNC-TN1000-98-004.pdf:0.86MB

no abstracts in English

JAEA Reports

None

Matsumoto, Shiro*; Tajima, Yasunori*; Koga, Jiro*; Miyahara, Yukari*

PNC-TJ1609 98-001, 26 Pages, 1998/02

PNC-TJ1609-98-001.pdf:0.7MB

no abstracts in English

JAEA Reports

None

; Ojima, Hisao

PNC-TN8410 97-220, 33 Pages, 1997/12

PNC-TN8410-97-220.pdf:1.63MB

None

JAEA Reports

None

PNC-TN8410 97-216, 305 Pages, 1997/03

PNC-TN8410-97-216.pdf:15.27MB

None

JAEA Reports

None

PNC-TN1100 97-003, 114 Pages, 1997/03

PNC-TN1100-97-003.pdf:6.97MB

no abstracts in English

JAEA Reports

None

*

PNC-TJ8211 97-002, 145 Pages, 1997/03

PNC-TJ8211-97-002.pdf:8.95MB

no abstracts in English

JAEA Reports

None

*

PNC-TJ8010 97-001, 81 Pages, 1997/03

PNC-TJ8010-97-001.pdf:3.18MB

no abstracts in English

JAEA Reports

None

; ; Nomura, Kazunori; Koyama, Tomozo; *;

PNC-TN8410 96-258, 46 Pages, 1996/09

PNC-TN8410-96-258.pdf:1.9MB

None

JAEA Reports

None

Nomura, Kazunori; *; *; Koyama, Tomozo; *; *; *

PNC-TN8410 96-206, 36 Pages, 1996/07

PNC-TN8410-96-206.pdf:1.4MB

None

JAEA Reports

None

PNC-TN8410 96-284, 245 Pages, 1996/03

PNC-TN8410-96-284.pdf:6.26MB

None

JAEA Reports

None

PNC-TJ1609 96-001, 36 Pages, 1996/02

PNC-TJ1609-96-001.pdf:0.89MB

no abstracts in English

JAEA Reports

None

; ; ;

PNC-TN8410 94-254, 158 Pages, 1994/06

PNC-TN8410-94-254.pdf:2.34MB

None

JAEA Reports

None

; *; ; ; *; *;

PNC-TN8410 93-283, 86 Pages, 1993/11

PNC-TN8410-93-283.pdf:2.38MB

None

JAEA Reports

None

; ; ; *; *;

PNC-TN8410 93-282, 69 Pages, 1993/11

PNC-TN8410-93-282.pdf:1.23MB

None

JAEA Reports

Electrolytic Extraction of platinum group metals from Purex process solutions.(2)

; ;

PNC-TN8410 93-006, 38 Pages, 1992/12

PNC-TN8410-93-006.pdf:0.7MB

Elimination of the ionic platinum group metals (palladium, rhodium, ruthenium) and technetium from dissolver solution seems to be an effective method to improve the stability, reliability and operability of the extraction process in spent nuclear fuel reprocessing. Some fundamental experiments were conducted for the purpose of establishing this new method. A method of electrolytic extraction to separate and recover such metals from Purex process solutions was investigated. Potentiostatic investigations of platinum group metals were carried out to identify deposition starting potential and rate in a nitric acid condition. As the results, it was found that the deposition rate depended on the electrode material, temperature, nitric acid concentration and coexistence ions. The deposition rate were found to be related to the polalization potential, and the optimum deposition potential was specified for each of platinum group metals.

JAEA Reports

None

; ; *; Nomura, Kazunori; *;

PNC-TN8410 92-267, 41 Pages, 1992/07

PNC-TN8410-92-267.pdf:0.9MB

None

34 (Records 1-20 displayed on this page)