Abstract
This paper concerns experimental and numerical works on a new differential calorimeter called CALORRE and validated recently under irradiation conditions in MARIA reactor at low nuclear absorbed dose rate level. Works focus on a specific configuration of CALORRE which was designed especially for the measurement of high nuclear energy deposition rates inside Material Testing Reactors. Due to the high level, a new calibration system was fabricated in order to determine the response of the new configuration under laboratory conditions for a very wide range of electrical power never applied in the literature. The response of the new configuration can be considered linear for this very wide range of electrical power. An analytical calculation shows the contribution of each heat transfer in specific zones. 3D thermal simulations performed by means of COMSOL Multiphysics under irradiation conditions give the predictions of the calorimeter behavior under real conditions (up to 20W.g−1).
Highlights
Research in the nuclear field lacks some experimental data essential for numerical simulations in harsh conditions and to better understand the behavior of inert materials or nuclear fuels under irradiations: understanding important for safety challenges, longevity of existing nuclear power plants (NPPs) and development of new concepts of NPPs
The nuclear absorbed dose rate is quantified inside a dedicated reactor channel thanks to temperature measurements and the use of calibration curves achieved preliminary, under laboratory conditions from steady thermal states when heating elements are integrated inside the calorimeter or from non-stationary thermal states for a single-cell calorimeter without heater
Research works coupling experiments with thermal numerical works (1D calculations and 3D simulations) allow the design, the characterization, the calibration, the qualification and the miniaturization of various calorimeters owning different metrological advantages. This approach led to the design of a new compact calorimetric cell called CALORRE characterized under laboratory conditions and to a first prototype validated under irradiations condition in the MARIA reactor at low nuclear absorbed dose rates (
Summary
Research in the nuclear field lacks some experimental data essential for numerical simulations in harsh conditions (including intense neutron and photon fluxes and high displacement per atom per year) and to better understand the behavior of inert materials or nuclear fuels under irradiations: understanding important for safety challenges, longevity of existing nuclear power plants (NPPs) and development of new concepts of NPPs. Research works coupling experiments (under laboratory and real conditions) with thermal numerical works (1D calculations and 3D simulations) allow the design, the characterization, the calibration, the qualification and the miniaturization of various calorimeters owning different metrological advantages (sensitivity, range, size...) This approach led to the design of a new compact calorimetric cell called CALORRE characterized under laboratory conditions and to a first prototype validated under irradiations condition in the MARIA reactor at low nuclear absorbed dose rates (
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