Abstract
Borate ion exchange capacity of Purolite NRW600 strong base anion resin in hydroxide form and mixed bed NRW600+NRW100 ion exchange was investigated with static experiments. Anion exchange resin was saturated with 0.1–45 g/dm3 concentration boric acid solution in a static mixer at 20, 30, 40 and 50 °C at 150 rpm for 24 hours. Remaining borate content of saturation solutions was deter-mined with ion chromatography and ICP-OES. The amount of fixed borate as borate anions increased with the saturation borate concentration as well as in case of simple anion exchange as in case of mixed bed.Column sorption-elution study was carried out by using strong base anion exchange resins (Purolite NRW600 and Amberlite IRN78). Resins in hydroxide and in chloride forms were saturated in column with 5–40 g/dm3 boric acid solution in excess. The resin was then eluted with 200 cm3 salt free water with 5 cm3/min at 25 °C and then eluted by 1 mol/dm3 sodium-sulfate solution with 5 cm3/min. The effluent was collected and analyzed for borate content by titrimetric method. In chloride form the resin adsorbed and released much less borate. Effective borate and polyborate sorption needs hydroxide ions in resin phase.
Highlights
Boron as the soluble boric acid is used as a neutron absorbent in the primary circuit of PWR NPP (Pressurized Water Reactor Nuclear Power Plant) to control the neutron flux
Borate ion exchange capacity of Purolite NRW600 strong base anion resin in hydroxide form and mixed bed NRW600+NRW100 ion exchange was investigated with static experiments
We investigated the borate sorption capacity and elution of strong base anion exchanger Amberlite IRN78 in hydroxide and chloride forms. 3 cm3 Amberlite IRN78 strong base anion exchange resin either in hydroxide or chloride form were saturated in a glass column with 3, 5, 15, 20 and 40 g/dm3 boric acid solution in excess
Summary
Boron as the soluble boric acid is used as a neutron absorbent in the primary circuit of PWR NPP (Pressurized Water Reactor Nuclear Power Plant) to control the neutron flux. Adjusting the boron concentration in the coolant provides compensation for reactor reactivity and control of power generation [1, 2]. It assures reactor safety during reactor startup, power changes, shutdown, as well as refueling and maintenance operations. The anion resins are usually borate saturated and the boric acid in the waste stream passes through with little change. Most of the ionic radionuclides in the waste stream can be removed and retained on the resins
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