[en] Efficient radioactive waste management calls for maximum volume reduction and selective separation of elements from a radioactive waste solution. Ethylenimine (EI) oligomer mixture (Mn = 423), a known complexing agent for strontium and Nanofiltration (NF) membrane (GE Osmonics HL1812T) has been used for selective strontium separation from an aqueous synthetic nuclear waste solution. NF membrane with MWCO of 100-300 Daltons and 0.4 m² area have the advantages of high retention, low operating pressure and higher permeate flux since their properties lie between RO and UF membranes

[en] Reprocessing of spent fuel from future metallic fuelled FBRs is proposed to be carried out by Pyroprocessing method. The process is carried out in an electro refiner. The LiCI-KCI salt in the High Temperature Electro refiner (HTER) is maintained at 500°C .The furnace provided at the outer surface is the heat source for electro refiner. Heat transfer analysis was carried out in COMSOL 4.3a software to estimate the furnace power and the height of furnace to achieve a uniform temperature in the salt phase. From the analysis, the salt temperature, power of the furnace and the height of the furnace were estimated. (author)

[en] Experiments were undertaken to study the feasibility of using weakly basic anion exchange resin for enrichment of isotopes of boron by ion exchange chromatography and water as eluent. The results of experiments carried out to determine total chloride capacity (TCC), strong base capacity (SBC) of the resin at different concentrations of boric acid and enrichment profiles are reported in this paper. (author)

[en] Waste generated during reprocessing of spent fuel from fast reactor contains lanthanoids along with other fission products R and D experiments were carried out to study the feasibility of separation of individual lanthanoids by ion exchange chromatography using strong acid cation exchange fine resin in nitric acid medium with concentration ranging from 0 to 4N. The values of distribution coefficient (K_d values) for individual lanthanoid were determined by batch method at 30 deg C using water bath. A feed solution was prepared with known volume of individual lanthanoid added to a known concentration of nitric acid. This solution was then taken in centrifuge tubes and placed in water bath for equilibration time of 3 h. Samples were filtered and analyzed using ICPMS. The plots of K_d, vs HNO₃ concentration has shown the adsorption behaviour of lanthanoids on cation exchange resin with maximum adsorption in nitric acid concentration range of 0.1N to 0.5N. Beyond this concentration range, the adsorption was reduced. Column experiments were also carried out using HIBA eluent under isocratic elution conditions and the results are shown