Irradiation campaign in the EOLE critical facility of fiber optic Bragg gratings dedicated to the online temperature measurement in zero power research reactors
Résumé
The control of temperature during operation of zero power research reactors participates to the overall control of experimentation conditions and reveals itself of a major importance more especially when measuring small multiplication factor variations. Within the framework of the refurbishment of the MASURCA facility, the development of a new temperature measurement system based on the optical fiber Bragg grating (FBG) technology is under consideration.
In a first step, a series of FBGs is irradiated in the EOLE critical facility with the aim to select the most appropriate. Online temperature measurements are performed during a set of irradiations that should allow reaching a fast neutron fluence nearly 5-1014 n.cm-2 and a total gamma dose less than 4 kGy. The results obtained, especially the Bragg wavelength shifts during the irradiation campaign, are discussed in this paper and compared to data from standard PT100 temperature sensors to highlight possible radiation effects on sensor performances. Work to be conducted during the second step of the project, aiming to a feasibility demonstration using a MASURCA assembly, is also presented.
Mots clés
Fiber gratings
Inductors
Temperature sensors
Uncertainty
Bragg gratings
fibre optic sensors
fission reactor instrumentation
fission research reactors
radiation effects
temperature measurement
EOLE critical facility
online temperature measurement system
zero power research reactor operation
temperature control
multiplication factor variations
MASURCA facility refurbishment
optical fiber Bragg grating technology
fast neutron fluence
total gamma dose
Bragg wavelength shifts
irradiation campaign
standard PT100 temperature sensors
sensor performances
MASURCA assembly