Yucca Mountain, Nevada is designated as the proposed geological repository for disposal of spent nuclear fuel (SNF) and high-level radioactive waste (HLW). The U.S. Department of Energy (DOE) is preparing a license application to be submitted to the U.S. Regulatory Committee (USNRC). The Waste Package Closure System (WPCS) project, as summarized in this report, addresses control-related subsystems needed to perform waste package closure-related operations. It includes technical requirements for the WPCS, including component design descriptions for the Welding and Inspection System, and Control and Data Management System. It also includes control functions and associated performance requirements for the Welding Process.