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Science and Technology of Nuclear Installations
Volume 2014 (2014), Article ID 293158, 8 pages
http://dx.doi.org/10.1155/2014/293158
Research Article

Modelling of the Radiological Contamination of the RBMK-1500 Reactor Water Purification and Cooling System

1Nuclear Engineering Laboratory, Lithuanian Energy Institute, 3 Breslaujos Street, 44403 Kaunas, Lithuania
2Department of Thermal and Nuclear Energy, Kaunas University of Technology, 73 K. Donelaicio Street, 44029 Kaunas, Lithuania

Received 5 February 2014; Accepted 21 August 2014; Published 31 August 2014

Academic Editor: Ali Hainoun

Copyright © 2014 G. Poskas et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper presents modelling results on the RBMK-1500 reactor water purification and cooling system (PCS) components contamination at Ignalina NPP Unit 1. The modelling was performed using a computer code LLWAA-DECOM (Tractebel Energy Engineering, Belgium), taking into consideration PCS components characteristics, parameters of the water flowing in circuits, system work regimes, and so forth. During the modelling, results on activity of PCS subsystems and components’ deposits and nuclide composition of deposits at the moment of the final shutdown of the reactor, as well as activity decay of the most contaminated PCS components’ deposits and dose rates after the final shutdown of the reactor, were obtained. Significant difference of contamination levels was revealed among PCS subsystems and subsystems components. The subsystem of nonpurified water is the most contaminated in PCS, and the activity of the least contaminated component in this subsystem is only 1.42% compared to the activity of the most contaminated component. The most contaminated and the least contaminated components of the purified water subsystem comprise 28.33% and 0.86% of activity, respectively, compared to the activity of the most contaminated PCS component.