Radiation levels in the ITER tokamak complex during and after plasma operation

Results of on-load simulations of activated water show photon biological dose rates approaching 3.2 kSv/h near the upper cooling pipes, and dose rates on the B2 level of the tokamak complex are typically of the order of 0.1 μSv/h or less inside the diagnostics and tritium handling buildings. On-load neutron dose rates are calculated to be less than 1 Sv/h inside the port cells. The dose rate resulting from activated steel pipe chases, 106 s after shutdown was typically a few μSv/h. Simulations of integrated dose to electronics for multiple divertor cask transfers show a dose to silicon inside the north-east electronics cubicle of 9.8 × 10−5 Gy and inside the tritium handling building is shown to be of the order of 1 × 10−7 Gy.