A system for the precise study of the nuclear decays of short-lived nuclei produced by neutron irradiation is described. The system as envisioned will employ continuous introduction of irradiated material into the ion source of an electromagnetic isotope separator and subsequent "on-line" operation of the separator in connection with nuclear decay analysis apparatus. The results of an empirical study are presented regarding the characteristics of a vapor transport line used for the extraction of irradiated material from the vicinity of the reactor core and transport to the isotope separator ion source. Of particular interest in this study are the transit times achieved with the system and properties of the system associated with the presence of electrical discharge in the vapor transport line. Extensions of the results of this study to an actual system are discussed.