[en] This document reports the technical accomplishments of the High Temperature Gas-Cooled Reactor (HTGR) Technology Program at GA Technologies Inc. during the first half of FY-84. The activities during this period included development in the following areas: systems engineering, reactor, reactor vessel, heat transport system, auxiliary heat removal system, plant protection system, plant control system, fresh fuel, metallic materials, graphite materials, advanced fuels, and advanced materials. In addition, technology transfer and exchange activities were undertaken with the Federal Republic of Germany, with the Fort St. Vrain program, and with programs sponsored by the Electric Power Research Institute. The activities are necessary to support the design of a steam cycle/cogeneration version of the HTGR