Tungsten is one of the primary material choices in the upcoming International Tokamak Experiment Reactor (ITER) to be built in in Cadarache, France.  As a plasma-facing material in the divertor region, tungsten and its ability to withstand > 1-5 MW/m² heat-flux and particle-flux deposition will be a major technological for future plasma-burning devices. Although tungsten has a high erosion threshold, helium products will be a pre-dominant impurity in burning plasmas.  Therefore, tungsten will be exposed to helium fluences > 10¹⁸ cm², which is known to induce helium bubbles and cavities in the tungsten surface structure. This can lead to enhanced surface erosion and generation of particle dust, a serious issue for ITER and other future burning plasma fusion device. As a possible solution to this problem, fine, ultrafine and nanocrystalline grained tungsten can be of higher radiation tolerance. In this project, Micro-powders of tungsten (average size of 1µm) were sintered using Spark Plasma Sintering (SPS) at different sintering conditions. High relative density of low impurity and high Vickers Hardness of the consolidated samples were obtained. The samples showed a multi-modal distribution, and the average grain size increased as the sintering temperature increased. The samples are irradiated with helium ions at high fluencies (≥ 10¹⁸ ions/cm²) for radiation tolerance investigation. In addition, tungsten powders with a core-shell structure (tungsten-tungsten carbide) are prepared via carburization of tungsten powders. These powders are believed to lead higher densities at low average grain size upon sintering with SPS at high temperatures.