Technical development of the filter system for dissolver off gas cleanup

PASSAT System: All operating data necessary for implementation of the experiments were set with the PASSAT system. The test cycles, which ran continuously over a period of four weeks, proceeded without any incidents. The performance data measured corresponded to the design data, except for the electric output of the trace heating. The overall pressure losses of the system at design data were lower than the differential pressure generated by the blower, which is in accordance with the design. Iodine Filter and Remote Operating Systems: The filters and remote operating systems were mechanically ready for use throughout the experiment. The filter exchanges performed and bagging-out of the spent filter elements together with the attachment of the screw lid of the waste drum (approx. 20 times) proceeded according to expectations and corroborated the correctness of the concept chosen. The required tightness of the iodine filter, which is to be < 10-3 Torr 1/s (external leak and tightness between the filter drum with the filter housing, i.e., on the polluted and clean air sides), was always checked after filter exchanges and during operation. It always corresponded to the level referred to above. (orig./RW)