Validation of axial void profile measured by neutron noise techniques in crocus
Paper i proceeding, 2020

Recently a joint project has been carried out between the Paul Scherrer Institut, the Ecole Polytechnique Federale de Lausanne and swissnuclear, an industrial partner, in order to determine the axial void distribution in a channel installed in the reflector of the zero power research reactor CROCUS, using neutron noise techniques. The main objective of the present paper is to report on the validation of the results against an alternative measurement technique using gamma-ray attenuation and simulations with the TRACE code. For the gamma-ray attenuation experiments, the channel used in CROCUS is installed out of the core in a Plexiglass water tank. The source and detector are fixed and the channel is moved axially to keep the geometry of the source/detector arrangement untouched. This is key to measure the void effect by gamma attenuation due to the low contrast of this technique. The paper compares the experimental results obtained with both techniques, with the outcomes of simulations carried out with the TRACE code. Even though the quantitative void fraction estimations are not consistent, the trends obtained with the simulation and experimental techniques are the same. The discrepancies between the various experimental techniques and the simulation outcomes are related to the heterogeneous distribution of the water-air mixture in the radial sections of the channel.

Void measurements

Attenuation measurements

Two-phase flow

Författare

Mathieu Hursin

Ecole Polytechnique Federale de Lausanne (EPFL)

Paul Scherrer Institut

Oskari Pakari

Ecole Polytechnique Federale de Lausanne (EPFL)

Gregory Perret

Paul Scherrer Institut

Pavel Frajtag

Ecole Polytechnique Federale de Lausanne (EPFL)

Vincent Lamirand

Paul Scherrer Institut

Ecole Polytechnique Federale de Lausanne (EPFL)

Imre Pazsit

Chalmers, Fysik, Subatomär fysik och plasmafysik

Victor Dykin

Chalmers, Fysik, Subatomär fysik och plasmafysik

Gábor Pór

Budapesti Muszaki es Gazdasagtudomanyi Egyetem

Henrik Nylén

Ringhals AB

Andreas Pautz

Ecole Polytechnique Federale de Lausanne (EPFL)

Paul Scherrer Institut

International Conference on Physics of Reactors: Transition to a Scalable Nuclear Future, PHYSOR 2020

Vol. 2020-March 1586-1593

2020 International Conference on Physics of Reactors: Transition to a Scalable Nuclear Future, PHYSOR 2020
Cambridge, United Kingdom,

Ämneskategorier

Acceleratorfysik och instrumentering

Strömningsmekanik och akustik

Signalbehandling

DOI

10.1051/epjconf/202124708004

Mer information

Senast uppdaterat

2021-06-29