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The aim of the project is development of verified modular technology, altogether with testing of its individual parts (sorbent module, related membrane processes) that could be used for effective treatment of large volumes of radioactive wastes, originating from potential VVER 440/1000 NPP severe accident. The technology would also aim to minimize the final radioactive wastes when ensuring radiation safety during waste management (transport and storage).

Material provider: Renecol limited (Eksorb)

Provided material(s):

• NIKET (E112)

• NIKET-K (E116) - F kompozit

• NIKET-K (E116) - S kompozit

• NIKET-K (E516) kompozit

• UNIKET (E212)

• UNIKET (E213) kompozit

• UNIKET (E214) kompozit

Analysis and experiments:

• Sorption efficiency Cs, determination of distribution coefficient Kd,

• Sorption efficiency Sr, determination of distribution coefficient Kd,

• Influence of model solution matrix on material integrity.


This contribution is giving the insight into the current situation of sorption material suitable for liquid radioactive waste treatment. It is a crucial responsibility of NPP operators to ensure the high level of nuclear safety. Broadening the scope of readiness for all possible scenarios contributes to the improvement of nuclear safety and influences the public image of nuclear energy. The background of presented project is readiness of NPP operators for non-project scenarios. However, the results are applicable in the whole scope of liquid radioactive waste treatment.

The topic of the presented project is an efficient treatment of a large volume of liquid radioactive waste resulted from a severe accident of NPP. After the reactor cool-down a large volume (10,000 m3) of radioactive waste would need to be cleaned.
The presented work describes evaluation of both commercial and novel materials and approaches to address the topic of large volume of radioactive waste treatment. The emphasis was given mainly to the sorption process. However, the membrane technologies were investigated as well. Various sorption materials were compared based on their properties, commercial availability and the results of stability and sorption efficiency tests. The equilibrium and kinetic parameters were evaluated in order to rank the sorption materials. The samples of sorbents were exposed to the model solution of boric acid simulating the post-accident solution. Sorption efficiency was tested on radioisotopes of Cs and Sr.