ESTIMATION OF NEUTRON AND PROMPT PHOTON DOSE RATE DISTRIBUTION IN TMSR-500 USING MCNP6

Thorium Molten Salt Reactor-500 (TMSR-500), one of the Generation IV nuclear reactors, is designed by Thorcon International, Pte. Ltd, which projected to be built in Indonesia. The reactor core radially surrounded B4C shielding, but not upper part. As silo hall sits above and accessible personnel, dose rate must calculated area ensure workers receive an annual below acceptable limit. from neutrons photons as result fission reactions are only sources this research, without taking source products into account. This research aims obtain distribution prompt using Monte Carlo code MCNP6. was assumed operate at a nominal thermal power 557 MWth. Dose calculation obtained flux Tally F4 converted Energy Function (DEDF) factor. Conversion factors were based on ICRP-21 ANSI/ANS-6.1.1 1977. calculations showed that neutron photon fluxes does reach hall.