Fiber-coupled nuclearized raman probe for remote gas monitoring in nuclear containment: proof-of-concept for h2-risk management of design & beyond-design accidents
Résumé
During the course of a severe accident (SA) in a Light Water Reactor (LWR), large amounts of hydrogen (H2) gas are likely to be generated and released into the containment during core degradation, potentially raising a combustion hazard. Additional burnable gases (H2 and CO) may be released into the containment volume in case of Molten Corium/Concrete Interaction (MCCI). Within the extension period of the MITHYGENE Project, CEA LIST, IRSN and ARCYS have designed, assembled and tested a fiber-coupled nuclearized gas prototype probe, based on optical Raman technology, and complying with the specifications of a severe accident. This monitoring technique conveys many decisive advantages such as chemical-selective, distributed and local gas measurement (cm 3 ). It aims at providing in situ accurate information on gas mixture (H2, O2, N2, steam, CO, CO2) in quasi real-time and in several locations inside the containment and the annulus. Compared to the previous Raman probe developed within the first period of the MITHYGENE Project, this new Raman probe is more efficient and includes improved functionalities such as polarization-diversity Raman measurements and anti-fogging anti-aerosol device with the aim to prevent both water condensation and aerosol deposition. Two algorithms are evaluated to compensate for Cerenkov perturbations (background subtraction and polarization correction). We describe experimental qualifications performed in the NC2V gas cell (CNRS-ICARE) and in the IRMA irradiation cell (IRSN). The MITHYGENE Project ends up with a proof-of-concept of Raman probe dedicated to H2/MCCI-risk management. The Technological Readiness Level (TRL) of the prototype probe is between 5 and 6.
Mots clés
Optical Fiber Sensor
hydrogen
mcci
monitoring
Raman
samgs
severe accident
instrumentation
nuclear instrumentation
fiber-coupled nuclearized gas prototype probe
detector
harsh environment
Distributed and Quasi-distributed sensing
anti-fogging
anti-aerosol
signal processing
Cerenkov perturbations
background subtraction
polarization correction
Raman probe
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