Influence of materials choice on occupational radiation exposure in ITER

In fission reactor plant,the radiation doses associated with inspection and maintenance of the primary cooling circuit account for a substantial fract ion of the collective occupational radiation exposure (ORE). Similarly, it is anticipated that much of the ORE occurring during normal operation of IT ER will arise from active deposits in the cooling loop. Using a number of c alculation steps ranging from neutron activation analysis, mobilisation and transport modelling and Monte Carlo simulation, estimates for the gamma ph oton flux and radiation dose fields around a typical 'hot-leg' cooling pipe have been made taking SS316,OPTSTAB, MANET-II and F-82H steels as alternat ive candidate loop materials. (C) 1998 UKAEA. Published by Elsevier Science B.V. All rights reserved.