Study on The Operation of Ion Exchange Resin in The Purification System of PWR Primary Water

Study on the operation of ion exchange resin in the purification system of PWR primary water has been done. Reactor cooling water, which in the beginning a stable with the required condition, but after reactor operation its quality often changes so it must be purified. Impurity substances in PWR primary water are corrosion, the radioactive contaminants of fission product (Cs137, Co90, C14, Tc99) and the leached from ion exchange resins. Water which is not satisfied for operation must be purified using ion exchange resins. The resins used to remove unwanted impurities, such as radioactive materials or other contaminants that could potentially harm the equipment or corrode reactor fuel rods. Resins which are recommended used in PWR (commercial) purification were as follow: cation exchanges IRC-50, 200-H, and 650-C, anion exchanges A-550 and 900-OH, mixture of cation and anion exchange was 21H (E codex P-202-H). Those ion exchange resins are synthetic organic polymer having matrix polystyrene (PS)and cross linking divinylbenzene (DVB). As an ion exchanges, resin of polystyrene - divinylbenzene (PSDVB) has an advantage properties such as good exchange capacity, selectivity,particle size compatibility, high stability at pH condition, fast flow rate of ion exchange, and the least waste volume produced. (author)