Measurement of the gas velocity in a water-air mixture in crocus by neutron noise technique
Paper i proceeding, 2019

© 2019 American Nuclear Society. All rights reserved. The possibility to measure the gas phase velocity in a two-component mixture with neutron noise techniques is demonstrated in the zero-power reactor CROCUS of the Ecole Polytechnique Federale de Lausanne. It is the first step toward the experimental validation of a theoretical method aiming at the reconstruction of the void profile in a BWR channel. For this experiment, a channel is installed in the water reflector of CROCUS and two-component mixtures are generated inside the channel through injection of air at various flow rates. The signal fluctuations of two neutron detectors located at different elevations next to the channel are recorded and their Cross Power Spectral Density analyzed with various techniques to determine the transit time of the gas phase and its velocity. Experimental results are compared with predictions obtained with the TRACE thermal-hydraulic code. Results disagree in their magnitudes but the evolution of the gas velocity with the air injection rate are similar.

Neutron noise measurement

Two-component flow

Gas velocity measurement

Författare

Mathieu Hursin

Paul Scherrer Institut

Ecole Polytechnique Federale De Lausanne

Oskari Pakari

Ecole Polytechnique Federale De Lausanne

Gregory Perret

Paul Scherrer Institut

Pavel Frajtag

Ecole Polytechnique Federale De Lausanne

Vincent Lamirand

Ecole Polytechnique Federale De Lausanne

Paul Scherrer Institut

Imre Pazsit

Chalmers, Fysik, Subatomär fysik och plasmafysik

Victor Dykin

Chalmers, Fysik, Subatomär fysik och plasmafysik

Gábor Pór

Budapesti Muszaki es Gazdasagtudomanyi Egyetem

Andreas Pautz

Ecole Polytechnique Federale De Lausanne

Paul Scherrer Institut

International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering, M and C 2019

2696-2703

2019 International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering, M and C 2019
Portland, USA,

Ämneskategorier

Energiteknik

Annan fysik

Strömningsmekanik och akustik

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Senast uppdaterat

2020-06-04