Towards the validation of neutron noise simulators: Qualification of data acquisition systems
Paper in proceedings, 2019

This paper deals with the processes involved in the generation of reliable experimental data for the validation of computer simulations. In the field of neutron noise, the analysis of results is based on spectral features of the detector signals in the frequency domain. Neutron noise simulators also produce estimates that are subjected to studies in the same domain. The validation process of such simulations begins with the generation of reliable experimental data. In this work, we analyze results from two neutron noise experimental campaigns. The focus is placed upon de comparison of results obtained by different data acquisition systems (DAQs) that were used to record the data in parallel. The goal is to verify whether results obtained by the different DAQs are consistent, and thus reliable. The neutron noise-dedicated experiments were carried out in the AKR-2 reactor at the Technische Universität Dresden and in the CROCUS reactor at the École polytechnique fédérale de Lausanne. The experiments consisted in introducing different types of periodic reactivity perturbations: a rotating neutron absorber with a varying absorption crosssection with respect to the rotation angle; a linearly vibrating absorber that is moved back and forth inside the reactor core; and a fuel rods oscillator that allows to vibrate a set of fuel rods.

CROCUS reactor

AKR-2 reactor

CORTEX

neutron noise

Author

Aldolfo Rais

EPFL

Vincent Lamirand

EPFL

Oskari Pakari

EPFL

Axel Laureau

EPFL

Joachim Pohlus

ISTec

ISTec

Christoph Pohl

TIS

Sebastian Hübner

Technische Universität Dresden

Mathieu Hursin

EPFL

Christophe Demaziere

Chalmers, Physics, Subatomic and Plasma Physics

Andreas Pautz

EPFL

Int. Conf. Mathematics & Computational Methods Applied to Nuclear Science & Engineering (M&C 2019)
Portland, USA,

Core monitoring techniques and experimental validation and demonstration (CORTEX)

European Commission (Horizon 2020), 2017-09-01 -- 2021-08-31.

Areas of Advance

Energy

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9/2/2019 3