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Auto-correlation and variance-to-mean measurements in a subcritical core obeying multiple alpha-modes
KTH, School of Engineering Sciences (SCI), Physics, Reactor Physics.
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2011 (English)In: Annals of Nuclear Energy, ISSN 0306-4549, E-ISSN 1873-2100, Vol. 38, no 2-3, 194-202 p.Article in journal (Refereed) Published
Abstract [en]

Neutron noise measurements based on the Rossi-alpha and Feynman-alpha methodologies have been performed in a heterogeneous subcritical system. It is shown that the traditional single alpha-mode formulations of the Rossi-alpha and Feynman-alpha methods are not applicable due to the presence of higher alpha-modes. Formalisms taking into account multiple alpha-modes are applied resulting in satisfactory results. Three alpha-modes could be identified using the Rossi-alpha method, whereas only two could be obtained using the Feynman-alpha method. In the Feynman-alpha case, the possibility to obtain the fastest decaying alpha-mode was diminished due to detector dead time effects. It was found that the slowest decaying alpha-mode does not exactly correspond to the prompt decay found in pulsed neutron source measurements, which confirms the results of previous studies. Strengths and weaknesses of the multiple alpha-mode Rossi-alpha and Feynman-alpha methods observed in this study are pointed out.

Place, publisher, year, edition, pages
2011. Vol. 38, no 2-3, 194-202 p.
Keyword [en]
Neutron noise experiment, Auto-correlation, Rossi-alpha, Variance-to-mean, Feynman-alpha, Reactivity determination
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-13583DOI: 10.1016/j.anucene.2010.11.009ISI: 000287571100004Scopus ID: 2-s2.0-78751615182OAI: oai:DiVA.org:kth-13583DiVA: diva2:326029
Note
QC 20100621 Uppdaterad från submitted till published (20110315).Available from: 2010-06-21 Created: 2010-06-21 Last updated: 2017-12-12Bibliographically approved
In thesis
1. On measurement and monitoring of reactivity in subcritical reactor systems
Open this publication in new window or tab >>On measurement and monitoring of reactivity in subcritical reactor systems
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Accelerator-driven systems have been proposed for incineration of transuranic elements from spent nuclear fuel. For safe operation of such facilities, a robust method for reactivity monitoring is required. Experience has shown that the performance of reactivity measurement methods in terms of accuracy and applicability is highly system dependent. Further investigations are needed to increase the knowledge data bank before applying the methods to an industrial facility and to achieve license to operate such a facility. In this thesis, two systems have been subject to investigation of various reactivity measurement methods. Conditions for successful utilization of the methods are presented, based on the experimental experience. In contrast to previous studies in this field, the reactivity has not only been determined, but also monitored based on the so called beam trip methodology which is applicable also to non-zero power systems. The results of this work constitute a part of the knowledge base for the definition of a validated online reactivity monitoring methodology for facilities currently being under development in Europe (XT-ADS and EFIT).

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. 72 p.
Series
Trita-FYS, ISSN 0280-316X ; 2010:18
Keyword
reactor, ADS, accelerator-driven systems, subcriticality determination, noise techniques, pulsed neutron source, reactivity monitoring
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-12483 (URN)978-91-7415-623-2 (ISBN)
Public defence
2010-05-12, FA32, Albanova University Center, Roslagstullsbacken 21, Stockholm, 14:00 (English)
Opponent
Supervisors
Note
QC 20100621Available from: 2010-05-06 Created: 2010-04-29 Last updated: 2011-06-09Bibliographically approved

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