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Real time monitoring of water level and temperature in storage fuel pools through optical fibre sensors

Rizzolo, Serena and Périsse, Jocelyn and Boukenter, Aziz and Ouerdane, Youcef and Marin, Emmanuel and Macé, Jean Reynald and Cannas, Marco and Girard, Sylvain Real time monitoring of water level and temperature in storage fuel pools through optical fibre sensors. (2017) Scientific Reports, 7 (1). ISSN 2045-2322

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Official URL: https://doi.org/10.1038/s41598-017-08853-7

Abstract

We present an innovative architecture of a Rayleigh-based optical fibre sensor for the monitoring of water level and temperature inside storage nuclear fuel pools. This sensor, able to withstand the harsh constraints encountered under accidental conditions such as those pointed-out during the Fukushima-Daiichi event (temperature up to 100 °C and radiation dose level up to ~20 kGy), exploits the Optical Frequency Domain Reflectometry technique to remotely monitor a radiation resistant silica-based optical fibre i.e. its sensing probe. We validate the efficiency and the robustness of water level measurements, which are extrapolated from the temperature profile along the fibre length, in a dedicated test bench allowing the simulation of the environmental operating and accidental conditions. The conceived prototype ensures an easy, practical and no invasive integration into existing nuclear facilities. The obtained results represent a significant breakthrough and comfort the ability of the developed system to overcome both operating and accidental constraints providing the distributed profiles of the water level (0–to–5 m) and temperature (20–to–100 °C) with a resolution that in accidental condition is better than 3 cm and of ~0.5 °C respectively. These new sensors will be able, as safeguards, to contribute and reinforce the safety in existing and future nuclear power plants.

Item Type:Article
HAL Id:hal-02093133
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > AREVA (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Institut d'optique Graduate School - IOGS (FRANCE)
Other partners > Université Jean Monnet - St Etienne (FRANCE)
Other partners > Università degli studi di Palermo (ITALY)
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Deposited On:08 Apr 2019 14:30

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