Environmental and economical assessment of various fusion reactors by the calculation of CO2 emission amount

We compared several fusion rectors from the view point of CO2 emission amount. Magnetic confinement systems we evaluated are Tokamak Reactor (TR), Helical Reactor (HR) and Spherical Tokamak reactor (ST). These models are calculated by Physics Engineering Cost (PEC) code. Parameters of Inertial confinement fusion Reactor (IR) is simply calculated by given pellet gains. In addition, different blanket modules and fuels are considered in TR designs. To calculate CO2 emission amount of fusion reactor defined by plasma parameters and radial build, we used basic unit for CO2 weights (k-t-CO2/t-material). Calculation results indicate that CO2 is the most emitted from the construction stage of coil systems for magnetic confinement fusion reactors. For the IR design, the construction stage of driver system and pellet purification stages involve much CO2 emission. By comparing fusion reactors with other power generation systems from the view point of CO2 emission amount, we confirmed that fusion reactor emits less CO2. Therefore, there is little influence on economics of fusion reactors by introducing carbon tax. (author)