Consideration of the Effect of Iodine Plateout on Containment Post-Loss-of-Coolant Accident Doses

The effect of halogen plateout sources on containment post-loss-of-coolant accident dose rates has been evaluated. The main approach utilized has been to compare the dose rates due to halogen plateout and halogen immersion (or atmospheric) sources, assuming each is comprised of an equal inventory of radioiodines. Based on the parameters chosen, including the use of only the primary ¹³¹I photon, 0.36 MeV, for all calculations, the gamma-ray dose rate from the atmospheric component will always dominate over the plateout component for full containment configurations. However, for small chambers within the containment, the atmospheric and plateout dose rates are relatively comparable, so that determining which is greater depends on the location of the dose point.