The purpose of this analysis is to determine the probability of occurrence of the unavailability of the nuclear heating, ventilation, and air-conditioning (HVAC) systems in the primary confinement areas of the Dry Transfer Facilities (DTFs) and Fuel Handling Facility (FHF) due to equipment failure. In addition, this analysis summarizes the results of the overall reliability of the HVAC systems in the primary confinement areas of the DTFs and FHF. Because the designs of the nuclear HVAC for the DTFs and the FHF are conceptual in nature, the intended use of this analysis is to provide estimates of HVAC reliability and develop solutions to support conceptual and preliminary design activities to provide reasonable assurance that the unavailability requirement can be achieved. The scope of this analysis is limited to evaluating the reliability of the HVAC systems in the primary confinement areas of the DTFs and the FHF.