Monte Carlo / thermal-fluids coupled calculations for MHTGR-350MW benchmark

- This paper presents coupled neutronics/thermal-fluid results for the steady-state exercise Phase 1 Exercise 3 (P1-Ex3) of the MHTGR-350MW (Modular High-Temperature Gas-Cooled Reactor) benchmark sponsored by the Nuclear Energy Agency of the Organization for Economic Cooperation and Development (OECD/NEA). The results were obtained with the Monte Carlo code MCS developed at UNIST (Ulsan National Institute of Science and Technology) and the thermal-fluid and system transient GAMMA+ code developed by KAERI (Korean Atomic Energy Research Institute). Comparisons between different solutions obtained by benchmark participants, including this solution, will be conducted by the benchmark organizers and first comparison results are expected to be available by end of 2017. The detailed analysis of benchmark solutions is expected to improve the simulation methods for modular prismatic reactors. (authors)