Radiation resilient fiber Bragg grating sensors for sensing applications in nuclear reactor cores

M. Zaghloul; M. Wang; S. Huang; C. Hnatovsky; D. Grobnic; S. Mihailov; M.-J. Li; D. Carpenter; L.-W. Hu; J. Dow; K. Chen

doi:10.1117/12.2296458

10 January 2018 Radiation resilient fiber Bragg grating sensors for sensing applications in nuclear reactor cores

M. Zaghloul, M. Wang, S. Huang, C. Hnatovsky, D. Grobnic, S. Mihailov, M.-J. Li, D. Carpenter, L.-W. Hu, J. Dow, K. Chen

Author Affiliations +

Proceedings Volume 10618, 2017 International Conference on Optical Instruments and Technology: Advanced Optical Sensors and Applications; 106180C (2018) https://doi.org/10.1117/12.2296458
Event: International Conference on Optical Instruments and Technology 2017, 2017, Beijing, China

Abstract

This paper reports testing results of radiation resilient fiber Bragg grating (FBG) in radiation resistant fibers in the nuclear reactor core at MIT Research Reactor Lab. FBGs were fabricated by 140-fs ultrafast laser pulse using a phase mask approach. In-core test of fiber Bragg gratings was carried out in the core region of a 6-MW research reactor at temperature > 600°C and an average fast neutron (>1 MeV) flux >1×10¹⁴n/s/cm². First 100-day tests of FBG sensors shows less than 5 dB reduction in FBG peak strength after over 1×10²⁰ n/cm² of accumulated fast neutron dosage. To test temporal responses of FBG sensors, a number of reactor anomaly events were artificially created to abruptly change reactor power, temperature, and neutron flux over short periods of time. The thermal optical coefficients and temporal responses of FBG sensors are determined at different accumulated dosages of neutron flux. Results presented in this paper reveals that temperature-stable Type-II FBGs fabricated in radiation-hardened fibers could be used as sensors to perform in-pile measurements to improve safety and efficiency of existing and next generation nuclear reactors.

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M. Zaghloul, M. Wang, S. Huang, C. Hnatovsky, D. Grobnic, S. Mihailov, M.-J. Li, D. Carpenter, L.-W. Hu, J. Dow, and K. Chen "Radiation resilient fiber Bragg grating sensors for sensing applications in nuclear reactor cores", Proc. SPIE 10618, 2017 International Conference on Optical Instruments and Technology: Advanced Optical Sensors and Applications, 106180C (10 January 2018); https://doi.org/10.1117/12.2296458

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KEYWORDS

Fiber Bragg gratings

Sensors

Medium wave

Fiber optics sensors

Temperature metrology

Silica

Optical fibers

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