overheating of resin occurs:

A number of changes are possible if overheating of resin occurs.  The Reactor coolant Cl^- levels would probably rise as an output of thermal breakdown and following release. Ion exchanger efficiency would be greatly decreased for same purpose.  Radioactivity stages of the reactor coolant would increase since of the release of impurities collected and later released from the resin. pH would likely decrease since of the release of H⁺ ions from the cation resin complex and might cause acidic conditions of the reactor coolant  if  the  temperature  were  enough  (>250ºF). Since the anion resin decomposes at lower temperatures, pH might increase as a result of the release of TMA and be accompanied through a dead fish odor.  Because of the cost of overheated resin, stringent temperature limitations are essential.  The ion exchanger should be taken out of service instantly and the cause rectified if overheating occurs.  The resin must be replaced prior to placing the ion exchanger back in service after overheating.