Resin extraction and treatment

Resin extraction and treatment

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Status: ongoing 
Period: 2016- 2025 

The purification of radioactive liquids produced spent ion exchange resins (filters) during the operation period of the plant (reactor cooling water, fuel pool, radioactive discharges); moreover, resins also resulted from the 2004 decommissioning activities of steam generators in the primary circuit. About 100 cubic metres of ion exchange resins are contained in 106 stainless-steel purifiers stored within interim storage facility n.1; these resins constitute the largest amount of radiological material within the plant . 

Wet Oxidation Plant

The treatment of radioactive resins is carried out by Wet Oxidation Technology – WOT, in a specific plant which will be installed in the former waste disposal building. This technique, usually applied to organic waste, has a low environmental impact and it may be easily reused to treat similar waste in other plants.
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Wet Oxidation Plant
 
 
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Oxidation aims at reducing size and organic load of the resins through three main steps: 
  • Pre-treatment, recovery of spent resins from purifiers and separation into homogeneous groups; 
  • Treatment, wet oxidation turning organic substance to water and carbon dioxide, and inorganic substance to a residue made of insoluble oxides and soluble salts; 
  • Post-treatment, collection of treated residues and shipment to the conditioning plant. 
 Modular waste conditioning station (SiCoMoR)

The residue obtained after treatment will be sent to the SiCoMoR cementation modular station to be conditioned in cementitious matrix and stored in 440-litres stainless-steel tanks. The station, 20x17 metres, with a low environmental impact modular structure, may be easily carried to other sites to perform the oxidation process .
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