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Reactivity monitoring with imposed beam trips and pulsed mode detectors in the subcritical experiment YALINA-Booster
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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, Published paper (Refereed)
Abstract [en]

Reactivity monitoring is one of the urgent problems that require a solution in order to achieve a license for a future full-scale ADS. As a part of the EUROTRANS experiments at the YALINA-Booster facility, presented in this conference, a set of measurements with imposed beam-trips has been performed. Traditionally, the source jerk method has been used in subcritical systems to obtain the reactivity by comparing the total neutron flux before the neutron source removal to the semi-stable delayed neutron flux after the source removal. The deuterium-tritium neutron source of the YALINA-Booster facility can, in addition to pulsed mode operation, operate with continuous beam with short imposed millisecond-scale interruptions, thus providing the possibility to monitor the reactivity at each beam trip in the source jerk manner. In order to test the validity of the beam-trip reactivity values determined by using detectors operating in current-mode (also presented in this conference), the reactivity values of the YALINA-Booster assembly obtained through the beam-trip technique using pulsed-mode detectors is presented in this work. In these experiments, a beam-trip frequency of 1 Hz and an interruption time of ∼20 ms have been chosen and two different core loadings with effective multiplication factor around 0.95 have been investigated. These two different loadings with close to equal reactivity but different source multiplication characteristics make it possible to explore the effect of the different source multiplications. In addition, the response of the imposed beam-trip reactivity monitoring technique to reactivity insertions and removals has been studied through control rod movements. Experimental data from fission chambers have been acquired from all three zones of the core: the fast booster zone, the thermal zone and the reflector.

Place, publisher, year, edition, pages
International Atomic Energy Agency, 2009.
Series
International Atomic Energy Agency. Proceedings Series, ISSN 0074-1884 ; 173
Keyword [en]
Beam trip, Continuous beams, Current mode, Delayed neutrons, Deuterium-tritium, Effective multiplication factor, Experimental data, Fission chambers, Pulsed mode, Pulsed-mode operation, Reactivity insertion, Reactivity monitoring, Source multiplication, Subcritical experiments, Subcritical systems, Thermal zones, Three zones, Urgent problems, Detectors, Deuterium, Monitoring, Neutron beams, Neutron flux, Neutron sources, Nuclear engineering, Removal, Tritium, Experiments
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-152416Scopus ID: 2-s2.0-79952809688ISBN: 978-920150410-4 (print)OAI: oai:DiVA.org:kth-152416DiVA: diva2:750791
Conference
IAEA International Topical Meeting on Nuclear Research Applications and Utilization of Accelerators, 4 May 2009 through 8 May 2009, Vienna, Austria
Note

QC 20140930

Available from: 2014-09-30 Created: 2014-09-26 Last updated: 2014-09-30Bibliographically approved

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