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Journal of Sensors
Volume 2012, Article ID 369375, 9 pages
http://dx.doi.org/10.1155/2012/369375
Research Article

Industrial Qualification Process for Optical Fibers Distributed Strain and Temperature Sensing in Nuclear Waste Repositories

1National Radioactive Waste Management Agency (Andra), 1-7 rue Jean Monnet, Parc de la Croix blanche, 92298 Chatenay-Malabry, France
2LabHC, UMR CNRS 5516, Université de Saint-Etienne, 42023 Saint-Etienne, France
3iXFIber, 22300 Lannion, France
4National Institute for Laser, Plasma and Radiation Physics, Magurele, Romania
5Cementys, 27 Villa Daviel, 75013 Paris, France

Received 20 July 2012; Accepted 8 October 2012

Academic Editor: Qiang Wu

Copyright © 2012 S. Delepine-Lesoille 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

Temperature and strain monitoring will be implemented in the envisioned French geological repository for high- and intermediate-level long-lived nuclear wastes. Raman and Brillouin scatterings in optical fibers are efficient industrial methods to provide distributed temperature and strain measurements. Gamma radiation and hydrogen release from nuclear wastes can however affect the measurements. An industrial qualification process is successfully proposed and implemented. Induced measurement uncertainties and their physical origins are quantified. The optical fiber composition influence is assessed. Based on radiation-hard fibers and carbon-primary coatings, we showed that the proposed system can provide accurate temperature and strain measurements up to 0.5 MGy and 100% hydrogen concentration in the atmosphere, over 200 m distance range. The selected system was successfully implemented in the Andra underground laboratory, in one-to-one scale mockup of future cells, into concrete liners. We demonstrated the efficiency of simultaneous Raman and Brillouin scattering measurements to provide both strain and temperature distributed measurements. We showed that 1.3 μm working wavelength is in favor of hazardous environment monitoring.