FIBER SENSORS

Temperature monitoring of nuclear reactor cores with multiplexed fiber Bragg grating sensors

[+] Author Affiliations
Alberto Fernandez Fernandez

SCK-CEN, Belgian Nuclear Research Centre, Boeretang 200, B-2400?Mol, Belgium

Universite´ libre de Bruxelles, CP 165/41, 50 av. F.D. Roosevelt, B-1050?Brussel, Belgium

Andrei I. Gusarov

Faculte´ Polytechnique de Mons, 31 Boulevard Dolez, B-7000?Mons, Belgium

Benoı⁁t Brichard, Serge Bodart, Koen Lammens

SCK-CEN, Belgian Nuclear Research Centre, Boeretang 200, B-2400?Mol, Belgium

Francis Berghmans

SCK-CEN, Belgian Nuclear Research Centre, Boeretang 200, B-2400?Mol, Belgium

Vrije Universiteit Brussel, Pleinlaan 2, B-1050, Brussel, Belgium

Marc Decre´ton

SCK-CEN, Belgian Nuclear Research Centre, Boeretang 200, B-2400?Mol, Belgium

Patrice Me´gret, Michel Blondel

Faculte´ Polytechnique de Mons, 31 Boulevard Dolez, B-7000?Mons, Belgium

Alain Delchambre

Universite´ libre de Bruxelles, CP 165/41, 50 av. F.D. Roosevelt, B-1050?Brussel, Belgium

Opt. Eng. 41(6), 1246-1254 (Jun 01, 2002). doi:10.1117/1.1475739
History: Received Feb. 26, 2001; Revised Oct. 31, 2001; Accepted Nov. 16, 2001; Online May 22, 2002
Text Size: A A A

In-core temperature measurement is a critical issue for the safe operation of nuclear reactors. Classical thermocouples require shielded connections and are known to drift under high neutron fluence. As an alternative, we propose to take advantage of the multiplexing capabilities of fiber Bragg grating (FBG) temperature sensors. Our experiments show that sensitivity to radiation depends on both the radiation field and the grating characteristics. For some FBGs installed in an air-cooled graphite-moderated nuclear reactor the difference between the measurements and the readings of calibrated backup thermocouples was within the measurement uncertainty. In the worst case, the difference saturated after 30 h of reactor operation at about 5°C. To reach megagray per hour level gamma-dose rates and 1019neutron/cm2 fluences, we irradiated multiplexed FBG sensors in a material testing nuclear reactor. At room temperature, FBG temperature sensors can survive in such radiation conditions, but at 90°C a severe degradation is observed. We evidence the possibility to use FBG sensing technology for in-core monitoring of nuclear reactors with specific care under well-specified conditions. © 2002 Society of Photo-Optical Instrumentation Engineers.

© 2002 Society of Photo-Optical Instrumentation Engineers

Citation

Alberto Fernandez Fernandez ; Andrei I. Gusarov ; Benoı⁁t Brichard ; Serge Bodart ; Koen Lammens, et al.
"Temperature monitoring of nuclear reactor cores with multiplexed fiber Bragg grating sensors", Opt. Eng. 41(6), 1246-1254 (Jun 01, 2002). ; http://dx.doi.org/10.1117/1.1475739


Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

PubMed Articles
Advertisement
  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.