Shutdown Dose Rate Analysis for the long-pulse D-D Operation Phase in KSTAR

¹ Center for Advance Research in Fusion Reactor Engineering (CARFRE), Seoul National University, Seoul, 08826, Korea
² Department of Nuclear Engineering, Seoul National University, Seoul, 08826, Korea
³ Department of Physics, Myongji University, Yongin, 17058, Korea

^* Corresponding author: junghoonhan@snu.ac.kr

Published online: 25 September 2017

Abstract

KSTAR is a medium size fully superconducting tokamak. The deuterium-deuterium (D-D) reaction in the KSTAR tokamak generates neutrons with a peak yield of 3.5x10¹⁶ per second through a pulse operation of 100 seconds. The effect of neutron generation from full D-D high power KSTAR operation mode to the machine, such as activation, shutdown dose rate, and nuclear heating, are estimated for an assurance of safety during operation, maintenance, and machine upgrade. The nuclear heating of the in-vessel components, and neutron activation of the surrounding materials have been investigated. The dose rates during operation and after shutdown of KSTAR have been calculated by a 3D CAD model of KSTAR with the Monte Carlo code MCNP5 (neutron flux and decay photon), the inventory code FISPACT (activation and decay photon) and the FENDL 2.1 nuclear data library.