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JAEA Reports

Influence of naturally-occurring heterogeneous complex-forming materials on the migration behavior of actinides in the geosphere (III)

Tochiyama, Osamu*

JNC TJ8400 2000-044, 53 Pages, 2000/02

JNC-TJ8400-2000-044.pdf:1.41MB

To estimate the polyelectrolyte effect and the effect of the heterogeneous composition of humic acids, the complex formation constants of Eu(III) and Ca(II) with Aldrich humic acid and polyacrylic acid were obtained, for Eu(10 $^{-8}$ to 10 $^{-5}$ M) by solvent extraction with TTA and TBP in xylene, for Ca (10 $^{-10}$ M) with TTA and TOPO in cyclohexane and for Ca(10 $^{-4}$ M) by using ion-selective electrode. By defining the apparent formation as $beta_{alpha}$ = [MR $_{m}$ ]/([M][R]), where [R] denotes the concentration of dissociated functional group, [M] and [MR $_{m}$ ] denote the concentration of free and bound metal ion and pcH is defined as-log[H], the values of log $beta_{alpha}$ have been obtained at pcH 4.8 - 5.5 in 0.1 - 1.0M NaClO $_{4}$ and NaCl. Log $beta_{alpha}$ of Eu-humate varied from 5.0 to 9.3 and that of Ca-humate from 2.0 to 3.4..For both humate and polyacrylate, log $beta_{alpha}$ increased with pcH or with the degree of dissociation. The increase in the ionic strength O.1 to 1.0 M decreased the log $beta_{alpha}$ , the decrease in log $beta_{alpha}$ of Eu(III)-humate is 1.6, that of Eu(III), polyacrylate 0.7, that of Ca(II)-humate 1.9 and that of Ca(II)-polyacrylate 1.2. While the increase in the metal ion produced no effect on log $beta_{alpha}$ of polyacrylate, log $beta_{alpha}$ of humate decreased. Depending on the concentration of Eu(III), the coexistence of Ca(II) reduced log $beta_{alpha}$ of humate by 0 to 0.8. The dependence of log $beta_{alpha}$ of humate on the metal ion concentration suggests the coexistence of strong and weak binding sites in the hmnic acid.

JAEA Reports

Tests on decisive proof for the incinerating and melting facility using the in-can type high frequency induction heating

; ; Kato, Noriyoshi; Miyazaki, Hitoshi; Tanimoto, Kenichi

JNC TN9410 2000-002, 149 Pages, 1999/12

JNC-TN9410-2000-002.pdf:23.51MB

LEDF (Large Equipment Dismantling Facility) is the solid waste processing technology development facility that carries out high-volume reduction and low dosage processing. The high-volume reduction processing of the high dose -waste configured with combustible waste, pvc & rubber, spent ion exchange resin, and noncombustible waste have been planned the incinerating and melting facility using the in-can type high frequency induction heating in LEDF. This test is intended to clarify the design data. It was confirmed that the incinerating and melting performance, molten solid properties and exhaust gas processing performance with pilot testing equipment and bench scale equipment. The result of this test are as follows. (1)Processing speed is 6.7kg/h for the combustible waste, 13.0kg/h for the ion exchange resin, and 30.0kg/h for the noncombustible waste. For above optimum processing conditions are as follows. (a)Operating temperature is 1000 $^{circ}$ C for the combustible waste, 1300 $^{circ}$ C for the ion exchange resin, 1500 $^{circ}$ C for the noncombustible waste. (b)Air flow is 90Nm $^{3}$ /h. Air temperature is 300 $^{circ}$ C. Air velocity is 20m/s. (2)Incineration time per day is 5h. Warm-up time and incineration time from the stop of waste charging is 0.5h. Melting time per day is 5h inconsideration of heating hold time of incinerated ash and melting of quartz. Warm-up time is 0.5h. (3)The system decontamination factor in Co, Cs and Ce with pilot testing equipment is 10 $^{5}$ or more. (4)Design data of the iron doped silica gel judged to be have a applicability as RuO $_{4}$ gas absorber is as follows. (a)Its diameter distribute in the range of 0.8-1.7mm. (b)To have a decontamination factor of 10 $^{3}$ can achieve for retention time of 3 seconds and its life time is about 1 year. (5)In terms of the distribution of the nuclear species in molten solid is evenly distributed. It was also confirmed that the distribution of main elements in ceramic layer is ...

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