System and method for treating fluid containing radiological material

A system for treating fluid comprising water, radioactive particulate, dissolved ions, and a neutron absorber, the fluid received from a reactor cutting zone, the system comprising:

• at least one heat exchanger for cooling the fluid containing the radioactive particulate;
• at least one pump configured to pump the fluid at a velocity greater than a deposition threshold through the at least one heat exchanger;
• a crystallisation unit configured to cool the fluid initially cooled by the at least one heat exchanger to a temperature below a freezing point of the fluid to form a first crystal comprising the water and to form a second crystal comprising the neutron absorber, the crystallisation unit comprising a mechanical device for removing the first crystal from the crystallisation unit and an outlet for discharging cooled fluid, the second crystal, radioactive particulate, and the dissolved ions;
• at least one scraper for removing at least one of the first and second ice crystals formed from the fluid in the crystallization unit;
• a wash system configured to reduce small particles entrained on the first ice crystal with surface water;
• and
• a melter configured to melt the washed ice crystals into a fluid to be returned to the reactor cutting zone.