As shown in the previous section, in the course of the UNEX process the only end products formed are a high-level strip product (a concentrate of all the recovered radionuclides) and a low-level raffinate; the spent UNEX­extractant withdrawn after its use from the process could be considered as a third product of the process.

The most important condition for evaluating the suitability of a HLW treatment technology is the effective and safe management of end (second­ary) products of such a treatment. Therefore, methods for management of the strip product, raffinate and spent extractant were tested to assess the suitability of the UNEX process.