Identification of the chemical inventory of different paint types applied in nuclear facilities
- PDF / 2,034,013 Bytes
- 19 Pages / 595.276 x 790.866 pts Page_size
- 75 Downloads / 163 Views
Identification of the chemical inventory of different paint types applied in nuclear facilities Sabrina Tietze • Mark R. St J. Foreman • Christian H. Ekberg • Bart E. van Dongen
Received: 8 August 2012 / Published online: 29 November 2012 Ó Akade´miai Kiado´, Budapest, Hungary 2012
Abstract The floors, concrete walls and many of the metal surfaces in nuclear power plant containments are coated with zinc primers or paint films to preserve the metal surfaces and simplify decontamination in the containment after the occurrence of a severe nuclear incident or accident. A chemical examination of paint films from different nuclear installations out of operation, as well as current operating ones, reveals that different types of paints are used whose composition can vary significantly. Results obtained for one type of paint at a certain nuclear site are in most cases unlikely to be comparable with sites painted with another type of paint. During normal operation and particularly during nuclear accidents, the paints will degrade under the high temperature, steam and irradiation influence. As paint and its degradation products can act as sources and depots for volatile iodine compounds, the type and aging conditions of the paint films will have a significant impact on the source term of the volatile fission product iodine. Thus, great care should be taken when extrapolating any results obtained for the interaction of radioactive iodine with one paint product to a different paint product. The main focus of the study is a
S. Tietze (&) C. H. Ekberg Nuclear Chemistry, Chalmers University of Technology, Chemical and Biological Engineering, Research Building 2, Kemiva¨gen 10, 412 96 Go¨teborg, Sweden e-mail: [email protected] M. R. St J. Foreman C. H. Ekberg Industrial Materials Recycling, Chalmers University of Technology, Chemical and Biological Engineering, 412 96 Go¨teborg, Sweden B. E. van Dongen School of Earth, Atmospheric and Environmental Sciences and Williamson Research Centre for Molecular Environmental Science, University of Manchester, Manchester M13 9 PL, UK
comparison of the chemical profile of paint films applied in Swedish nuclear power plants. Teknopox Aqua V A, an epoxy paint recently used at Ringhals 2, and an emulsion paint used in the scrubber buildings of Ringhals 1–4 are compared with a paint film from Barseba¨ck nuclear power plant unit 1 that had been aged under real reactor conditions for 20 years. In addition, two paint films, an emulsion and a gloss paint, used in an international nuclear fuel reprocessing facility, are compared with the paints from the Swedish nuclear power plants. Keywords Epoxy paint Containment Severe nuclear accidents Iodine Organic iodides Methyl iodide Volatile iodine source term
Introduction During a severe nuclear reactor accident, iodine can be released in larger amounts from damaged fuel and the damaged fuel cladding in the case of a core meltdown [1]. During the clean-up after the Three Mile Island accident, it was found that the paint films re
Data Loading...
