Fluorex reprocessing system for the thermal reactors cycle and future thermal/fast reactors (coexistence) cycle

Kobayashi, Hiroaki; Amano, Osamu; Kawamura, Fumio; Aoi, Masakatsu; Hoshino, K.; Sasahira, Akira; Kani, Yuko

doi:10.1016/j.pnucene.2005.05.037

Cited by 12 publications

(11 citation statements)

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“…U(VI) values were measured in HNO 3 Figure 2, the plots give a good linear relationship. This means that the precipitation reaction of U(VI) with DMPU occurs almost stoichiometrically.…”

Section: Measurement Of Dfs Of Simulated Fpsmentioning

confidence: 73%

“…Nitric acid solutions containing U(VI) (1.50 M) were prepared by dissolving UO 2 (NO 3 ) 2 Á 6H 2 O into HNO 3 solution. After addition of DMPU, NBP, or NCP (the concentration of added precipitant is expressed as [Precipitant]) to HNO 3 solutions containing U(VI), the solutions were shaken vigorously, followed by standing for 1 h at room temperature and centrifuging for 5 min.…”

Section: Precipitation Experiments For U(vi)mentioning

confidence: 99%

“…After addition of appropriate amounts of DMPU, NBP, or NCP, and shaking for 0.5 or 5.0 min at 2500 rpm, the precipitates were filtered and washed three times by using 1.0 mL of 3.0 M HNO 3 [22]. Under this condition, the P.R.…”

Section: Measurement Of Dfs Of Simulated Fpsmentioning

confidence: 99%

“…These matters result in complexity of processes and an increase in products of radioactive wastes. In order to overcome such disadvantages, some innovative reprocessing methods for spent nuclear fuels have been developed, e.g., Fluorex [3,4], NEXT [5], Super-Direx [6], Urexþ [7], and pyrochemical methods [8].…”

Section: Introductionmentioning

confidence: 99%

“…In order to develop the proposed reprocessing system, we have studied precipitation ability of NRPs to U(VI), Pu(IV), and Pu(VI) species in HNO 3 solutions, decontamination ability to fission products (FPs), and radiation-and heat-resistances of NRPs [16]. As a result, N-n-butyl-2-pyrrolidone (NBP) and N-neopentyl-2-pyrrolidone were selected as the precipitants for the first and second precipitation processes, respectively.…”

Section: Introductionmentioning

confidence: 99%

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A study on selective precipitation ability of cyclic urea to U(VI) for developing reprocessing system based on precipitation method

Suzuki¹,

Kawasaki²,

Kohara³

et al. 2012

Journal of Nuclear Science and Technology

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We have proposed a new reprocessing system based on precipitation method. In order to find out precipitants with high selectivity to U(VI) and to investigate factors controlling precipitation ability to U(VI) and U(IV), properties of 3,4,5,6-tetrahydro-1,3-dimethyl-2(1H)-pyrimidinone (DMPU) as a precipitant have been examined by using U(VI), U(IV) as a simulant of Pu(IV), and simulated fission products (FPs). We have evaluated precipitation ratios (P.R.) for U(VI) and U(IV), solubility of U(VI) precipitates to 3.0 mol dm 73 (M) HNO 3 solution, melting points (MPs) of U(VI) precipitates, log P (distribution ratio of a substance in 1-octanol/water biphasic system, a measure of hydrophobicity) of precipitants, and decontamination factors (DFs) of FPs. The properties of DMPU were compared with those in systems using N-n-butyl-2-pyrrolidone (NBP), N-cyclohexyl-2-pyrrolidone (NCP), and other pyrrolidone derivatives as the precipitant. The P.R. values of DMPU to U(VI) and U(IV) in 3. , and Sm(III)] used in the present study were found to be more than 100. Even in U(VI)-U(IV) coexisting system, the selectivity of DMPU to U(VI) was higher than those of NBP and NCP. This selective precipitation ability of DMPU to U(VI) was evaluated by the solubility of U(VI) precipitates on the basis of their MPs and the log P values of precipitants. As a result, it was found that the precipitants having low hydrophobicity and forming the U(VI) precipitates with high MPs have highly selective precipitation ability to U(VI).

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“…U(VI) values were measured in HNO 3 Figure 2, the plots give a good linear relationship. This means that the precipitation reaction of U(VI) with DMPU occurs almost stoichiometrically.…”

Section: Measurement Of Dfs Of Simulated Fpsmentioning

confidence: 73%

Section: Precipitation Experiments For U(vi)mentioning

confidence: 99%