Selective removal of uranium and evaluation of N,N,N',N' tetra octyl diglycolamide (TODGA) for actinide-partitioning from high-level waste (HLW)

In the present paper, an attempt has been to optimise the conditions for the selective extraction of U over Pu, Np, Am and fission products from simulated high-level waste (SHLW) employing TBP as extractant. Reductants such as hydroxylamine nitrate (HAN), N,N-diethyl hydroxylamine nitrate (DEHAN) and hydrazine nitrate (HN) were evaluated in the present work as they are incinerable and may help in waste volume reduction. The SHLW solution was prepared by taking only those ions, which were present in significant concentration after the reprocessing of Al-clad natural uranium research reactor spent fuel. (orig.)