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Neutron noise measurements in the YALINA-Booster experiments
KTH, School of Engineering Sciences (SCI), Physics, Reactor Physics.
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2009 (English)In: Proceedings of International Topical Meeting on Nuclear Research Applications and Utilization of Accelerators: 4-8 May 2009, Vienna, International Atomic Energy Agency, 2009Conference paper (Refereed)
Abstract [en]

In addition to the pulsed neutron source measurements and the continuous source beam-trip and current-to-flux measurements performed in the YALINA-Booster facility, also presented in this conference, a set of neutron noise measurements has been performed to achieve a complete characterization of the core. The neutron noise measurements have been performed in three different configurations covering a subcriticality range from 0.85 to 0.977. The Rossi-α neutron noise technique has been applied to detector counts from two channels in the thermal part of the core. The Rossi-α results are compared to the experimental prompt neutron decay constants obtained from the pulsed neutron source measurements. A first approach fitting procedure reveals a need of three exponentials to describe the Rossi-α histograms. It has been found that at deep subcriticality, the fundamental mode decay may coincide with or be close to a higher eigenmode, thus making it difficult to determine the prompt neutron decay constant correctly.

Place, publisher, year, edition, pages
International Atomic Energy Agency, 2009.
, Proceedings series (International Atomic Energy Agency), ISSN 0074-1884 ; 173
Keyword [en]
Detector counts, Eigen modes, Exponentials, Fitting procedure, Flux measurements, Fundamental modes, Neutron noise, Prompt neutron decay constant, Pulsed neutron sources, Subcriticality, Two channel, Neutron emission, Neutron sources, Nuclear engineering, Reactivity (nuclear), Acoustic noise measurement
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-152442ScopusID: 2-s2.0-79952782621ISBN: 978-920150410-4OAI: diva2:750148
IAEA International Topical Meeting on Nuclear Research Applications and Utilization of Accelerators, 4 May 2009 through 8 May 2009, Vienna, Austria

QC 20140926

Available from: 2014-09-26 Created: 2014-09-26 Last updated: 2014-09-26Bibliographically approved

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Berglöf, Carl
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