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Science and Technology of Nuclear Installations
Volume 2015 (2015), Article ID 650810, 11 pages
http://dx.doi.org/10.1155/2015/650810
Research Article

Safety Assessment of Low-Contaminated Equipment Dismantling at Nuclear Power Plants

Lithuanian Energy Institute, Breslaujos Street 3, LT-44403 Kaunas, Lithuania

Received 9 September 2014; Revised 16 January 2015; Accepted 16 January 2015

Academic Editor: Leon Cizelj

Copyright © 2015 Egidijus Babilas 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

The decommissioning of nuclear facilities requires adequate planning and demonstration that dismantling and decontamination activities can be conducted safely. Existing safety standards require that an appropriate safety assessment be performed to support the decommissioning plan for each facility (International Atomic Energy Agency, 2006). This paper presents safety assessment approach used in Lithuania during the development of the first dismantling and decontamination project for Ignalina NPP. The paper will mainly focus on the identification and assessment of the hazards raised due to dismantling and decontamination activities at Ignalina Nuclear Power Plant and on the assessment of the nonradiological and radiological consequences of the indicated most dangerous initiating event. The drop of heavy item was indicated as one of most dangerous initiating events for the discussed Ignalina Nuclear Power Plant dismantling and decontamination project. For the analysis of the nonradiological impact the finite element model for the load drop force calculation was developed. The radiological impact was evaluated in those accident cases which would lead to the worst radiological consequences. The assessments results show that structural integrity of the building and supporting columns of building structures will be maintained and radiological consequences are lower than the annual regulatory operator dose limit.