Radiation Damage to TBP/Kerosene Solvent, (II)

Abstract

Radiation damage to 30;.·,:; TBP/kerosene was investigated to determine changes in the extraction behavior of uranium and thorium with the solvent irradiated up to 10 9 R in nitrate system and similarly in the stripping behavior with 0.01 N nitric acid.The effect on uranium and thorium was discernible only with irradiations reaching 109 R.Changes in the behavior of fission products present in company with uranium or thorium were found to be the similar to the case where they existed free of uranium or thorium, At irradiations below 10 7 R, uranium and thorium manifested loading efFect, but it disappeared when irradiation reached 10 8 R.Calculation of one stage decontamination factors of fission products from uranium and thorium confirmed deterioration of the power of separation with irradiation, and the degree of deterioration was determined quantitatively. The decontamination factor for 95 Nb was decreased to l/2,000 by irradiation to lOB R, while the same dosage of irradiation had little effect for t06Ru-'o•Rh.Physical properties such as density, viscosity, emulsification tendency and phase separation time were also observed to be effected by irradiation to lOB R.

Empirical Correlations for Radiolytic Degradation of n-Dodecane Density, Viscosity and Phase Separation Time.

“…The dose range was based on the dose in one pass through a reference high active column in Purex process 16) from a serious damage at 10 to 240 Wh/dm 3 in which TBP began to form polymer. 11) (2) Measurement Each sample was experimented severally three times under the same condition at 25 • C, and the average value was adopted.…”

“…The chemical species based on diluent degradation were discussed in several papers. 7,[10][11][12][13][14][15] Radiolytic degradation products of 30 vol% TBP/undecane-3M HNO 3 in the presence and absence of uranyl nitrate were studied by Adamov et al 7) The main degradation yields in their liquid system were determined for products of radiolysis of n-undecane: undecanoles, undecanones, undecyl nitrates, nitroundecanes and dimers of undecane molecule. They observed the yields of the chemical product rose with increasing in the absorbed dose.…”

Determination of Di-n-Butyl Phosphate in Organic Streams of FBTR Mixed Carbide Fuel Reprocessing Solution by Gas Chromatographic Technique

“…During the solvent extraction process the solvent TBP undergoes degradation by hydrolysis and radiolysis yielding mainly Di -n-butyl phosphate (DBP) ((C 4 H 9 O) 2 P = O-(OH)), to a lesser extent monobutylphosphate (MBP) ((C 4 H 9 O)P = O-(OH) 2 ), phosphoric acid and butanol [2]. The DBP complexes with Zr, Pu and other metal ions [3] which leads to loss of heavy metals to lean organic stream. Hence the quality of PUREX solvent is generally measured in terms of the concentration of DBP.…”

Radiolysis of n-dodecane and Its Physical Property Change Based on the Dose in One Pass through a Reference HA Column

“…Huggard and Warner proposed a possible reaction scheme in kerosene degradation based on known chemistry of the detectable groupings(lO). Tsujino and Ishiwara observed a radiation effect of degraded kerosene on physical properties such as density, viscosity, emulsification tendency and phase separation time in the range of 0.18 kGy to 1.75 MGy (11). Bellido and Rubenich(12) studied the influence of the several diluents, n-dodecane, Varsol, benzene, toluene and dodecane-toluene mixtures on the radiolytic degradation of TBP in 30 vol% TBP-diluent and 30 vol% TBPdiluent-HNOs systems.…”