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Decommissioning of the A-1 NPP Heavy Water Evaporator Facility

[+] Author Affiliations
Jan Medved

VUJE, a.s., Trnava, Slovakia

Ladislav Vargovcik

ZTS VVU Košice, a.s., Kosice, Slovakia

Paper No. ICEM2011-59225, pp. 301-307; 7 pages
  • ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management
  • ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management, Parts A and B
  • Reims, France, September 25–29, 2011
  • Conference Sponsors: Nuclear Engineering Division and Environmental Engineering Division
  • ISBN: 978-0-7918-5498-3
  • Copyright © 2011 by ASME


The paper deals with experience and techniques in the application of remotely controlled robotic devices for the dismantling of the A-1 NPP technological equipment during undergoing decommissioning process of the A-1 NPP, which is characterized by high level of radioactivity and contamination. For liquidation of the heavy water evaporator has been applied a mobile robotic system MT 80, which had been developed, designed and constructed as a general-purpose decommissioning equipment. The heavy water evaporator as a part of the NPP heavy water system is located inside the main production unit building in Room No. 220 where the inner surface contamination is from 101 Bq/cm2 to the level of 103 Bq/cm2 , dose rate up to 1.5 mGy/h and the feeding pipeline contained LRAW with high tritium content. The first step was the development of a work procedure with special focus on the elimination of activity and aerosols leaking into the environment. Special tooling was developed for application with the robot, such as hydraulic shears, circular saw, reciprocating saw, circular pipe cutter and a system for quick tool-change without direct intervention of the operators. Then, civil engineering modifications were made to the workplace and new technology was installed, including an efficient exhaust system. After draining-off the remains of LRAW and rinsing the pipeline, fragmentation of the pieces of equipment was started. The fragments are being deposited into drums which are transported in shielded containers to the decontamination facility, where their activity is reduced prior to their storage or further use. All operations are remotely controlled on basis of visual information from four cameras, with consistent radiation protection of the operators. This experience will be exploited in the continuation of work in Room No. 219, where the second identical heavy water evaporator is located. Nuclear Power Plant A-1 is situated in the locality of Jaslovské Bohunice. The A-1 NPP decommissioning has been organized according to distinctively licensed phases, which allows collecting input data for next stage during the running decommissioning stage. Since 2009 the Stage II of the A-1 NPP decommissioning has been in process.

Copyright © 2011 by ASME



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