OPERATING GUIDE FOR RADIOCHEMICAL LABORATORIES AT VARIOUS ACTIVITY LEVELS
Abstract
volumes. Development work for this process had indicated a useful capacity of about 2000 bed volumes, however, and the plant has routinely operated using this value. Resin samples showed that the static volumetric distribution coefficient (DC) for cesium had dropped from 3900 for new resin to about 475 for used resin. Also, the DC for strontium dropped from 20,000 to about 5500. The optimum loading of cesium was found at pH 11.9. No clear-cut cause could be established for the occasional incomplete calcium precipitation. Even using exhausted resin, however, the exit stream is below the permissible concentration for all radionuclides in public streams. Recommendations from this study are immediate replacement of all three resin columns, relocation of the pH-sensing electrode in the precipitation step, use of a more dilute caustic solution for regeneration, institution of a sampling routine to determine more promptly the breakthrough of cesium from the resin, and relocation and possible modification of the gamma detector in the exit stream.
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