Distribution of Plutonium Isotopes in Cooling Water from a PWR.

概要

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An investigation of plutonium isotopes in the primary cooling system of the Ringhals unit 2 (PWR) during normal operation has shown average concentrations of 0.03 Bq•l-1 of 238pu and 0.02 Bq•l-1 of 239+240Pu. A major fraction of plutonium is associated with particles in contrast to dissolved plutonium in ionic form. The observed concentrations of plutonium isotopes in cooling water are characterized by log-normal distributions. The overall efficiency of the ion-exchange cleaning system with respect to plutonium in the primary circuit has been estimated as approximately 60 %. During normal operation the ion-exchange cleaning system annually collects about 3 MBq of 238Pu and 2 MBq of 239+240Pu. The cleaning system efficiently removes plutonium particles with sizes in the range 0.05 to 0.15 prn from the primary cooling water. Particles with sizes outside this range are removed less efficiently.
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