EPJ Web Conf.
Volume 247, 2021PHYSOR2020 – International Conference on Physics of Reactors: Transition to a Scalable Nuclear Future
|Number of page(s)
|Research Reactors and Facilities
|22 February 2021
DOSIMETRY MODELING AND EXPERIMENTAL VALIDATION FOR THE PETALE PROGRAM IN THE CROCUS REACTOR
1 Laboratory for Reactor Physics and Systems behaviour (LRS) Ecole Polytechnique F´ed´erale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
2 Laboratory for Reactor Physics and Thermal Hydraulics (LRT), Paul Scherrer Institut (PSI) CH-5232 Villigen, Switzerland
3 CEA/DEN, Experimental Physics, Safety & Instrumentation Division (SPESI) 13108 St-Paul-Lez-Durance, France
4 Nuclear Energy and Safety Research Division (NES), Paul Scherrer Institut (PSI) CH-5232 Villigen, Switzerland
Published online: 22 February 2021
The PETALE experimental program in the CROCUS reactor intends to provide integral measurements on reactivity worth and dosimetry measurement to constrain nuclear data relative to stainless steel heavy reflectors. The experimental setup consists in eight successive plates of pure iron, pure nickel, pure chromium, or nuclear-grade stainless steel set at the close periphery of the core. The plates are interleaved with up to nine dosimeters that consist of thin activation foils with different possible materials to be sensitive to different ranges of the neutron spectrum. A precise measurement with a good estimation of the uncertainties and correlations is required, especially when comparing reaction rates, e.g. transmission measurement and/or spectral indices.
The present work focuses on the validation of the dosimetry technics developed in preparation of this experimental program. Different aspects are discussed: monitors, efficiency calibration, self-absorption correction, self-shielding and nuclear data uncertainties. The different sources of uncertainties for the experiment-calculation comparisons are characterized, taking into account all the correlation between the different dosimeters. These correlations are a mandatory element for the aimed Bayesian assimilation in order to avoir overfitting when considering dosimeter providing a similar information.
Key words: Integral experiment / dosimetry / uncertainty propagation / PETALE experimental program
© The Authors, published by EDP Sciences, 2021
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