App Rx503 - Decontamination from radionuclides of condensates of evaporators at K503 nuclear power plant - Case Study
Processing of radioactive wastes leads to the formation of radioactive condensates of evaporators (debalance water) containing ammonia as the basic compound in the concentration of 7 - 25 mg/dm3 and having a pH value ranging 7.0 - 8.5. Besides, oils and other organic compounds are usually present in the water.
RAXORB3/5, a granular (0.4 - 1.0 mm spheres) selective ion-exchanger, chemically composed of ferrocyanide of divalent metals fixed on inorganic carrier, was used as sorbents in the construction of a filter system for the decontamination of debalance water at K503 nuclear power plants.
Because the radioactivity of debalance water was essentially due to radionuclides of Cesium (40-3700 Bq/l), RAXORB3/5 was chosen since its selectivity towards 137Cesium which absorption ratio is:
- from debalance water > 1x104 cm3/g
- from 0.01 mole/dm3 of NH4Cl > 1x104 cm3/g
- from 0.5 mole/dm3 of NH4Cl > 1x104 cm3/g
Debalance water of K503 nuclear power station was filtered at rate of 30 times the volume of RAXORB3/5. After filtering 46,000 times the volume of sorbent it was noticed that the RAXORB3/5 was far from being exhausted.