Estimation of the radiation doses during the dismantling of the equipment in Building 117/1 at the Ignalina NPP

The Ignalina NPP was operating two RBMK-1500 reactors which are under decommissioning now. Building 117/1 was the first dismantling project at the Ignalina NPP. The DECRAD computer code was used to plan dismantling and decontamination (D&D) activities in Building 117/1. The D&D activities in Building 117/1 were finished at the end of 2011. In this paper, collective doses, duration of the dismantling activities and other parameters defined during the planning of the D&D activities for Building 117/1 are compared with the real dismantling data and also with updated modelling results.