Radionuclide release in vapor tests by means of thin-film flow~*

摘要

Tests examining the reaction of two types of spent fuel with saturated water vapor have been in progress at 90 deg C for over four years.The experimental setup and data for these unsaturated tests have been reported elsewhere [1].In the vapor tests about 8 g of spent fuel in large fragments sits in a Zircaloy holder under saturated water vapor conditions.The base of the holder contains 10- um m holes in a foil to permit condensed liquid to be colloected in the base of the stainless steel vessel in which the holder is suspended.In the vapor tests,several radionuclides (Tc,U and Sr) have been found in the collected liquid.