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International Journal of Corrosion
Volume 2012 (2012), Article ID 643727, 6 pages
http://dx.doi.org/10.1155/2012/643727
Research Article

Analysis of Steam Generators Corrosion Products from Slovak NPP Bohunice

1Nuclear Research and Consultancy Group, Westerduinweg 3, 1755 ZG Petten, The Netherlands
2Institute of Nuclear and Physical Engineering, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology in Bratislava, Ilkovicova 3, 812 19 Bratislava, Slovakia
3Faculty of Physics, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
4NPP Jaslovské Bohunice, SE, a.s., 821 09 Bratislava, Slovakia
5AREVA NP Controls, S.R.O., Vajnorská 13, 831 04 Bratislava, Slovakia

Received 9 February 2012; Accepted 28 April 2012

Academic Editor: W. Ke

Copyright © 2012 Jarmila Degmová 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

One of the main goals of the nuclear industry is to increase the nuclear safety and reliability of nuclear power plants (NPPs). As the steam generator (SG) is the most corrosion sensitive component of NPPs, it is important to analyze the corrosion process and optimize its construction materials to avoid damages like corrosion cracking. For this purpose two different kinds of SGs and its feed water distributing systems from the NPP Jaslovske Bohunice were studied by nondestructive Mössbauer spectroscopy. The samples were scraped from the surface and analyzed in transmission geometry. Magnetite and hematite were found to be the main components in the corrosion layers of both SGs. Dependant of the material the SG consisted of, and the location in the system where the samples were taken, the ratios between magnetite and hematite and the paramagnetic components were different. The obtained results can be used to improve corrosion safety of the VVER-440 secondary circuit as well as to optimize its water chemistry regime.