Evaluating the gamma dose rate for the liquid waste treatment facility in Fukushima site with Attila radiation transport code

Abstract

A decontamination system was co-developed by AREVA a and Veolia Water b for the Fukushima Daiichi nuclear plant. This system is designed to reduce the water radioactivity level by a factor of 10 000 and to treat up to 50 tons of contaminated waters per hour. The ambient gamma dose rate (DER) is calculated in the Radioactive Waste Treatment Facility by using the 3D-Sn ATTILA © 7.1 code in the aim of planning maintenance. Especially, DER iso-curves allow defining quickly the ways which minimize radiological exposure of the maintenance teams.