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Reactivity Assessment in Subcritical Systems
KTH, School of Engineering Sciences (SCI), Physics.
2007 (English)Licentiate thesis, comprehensive summary (Other scientific)
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. In this thesis, the most important existing reactivity determination methods have been evaluated experimentally in the subcritical YALINA-experiments in Belarus. It is concluded that the existing methods are sufficient for calibration purposes, but not for reactivity monitoring during regular operation of an accelerator-driven system. Conditions for successful utilization of the various methods are presented, based on the experimental experience.

Place, publisher, year, edition, pages
Stockholm: KTH , 2007. , 85 p.
Series
Trita-FYS, ISSN 0280-316X ; 2007:13
Keyword [en]
Reactor Physics
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-4363ISBN: 978-91-7178-611-1 (print)OAI: oai:DiVA.org:kth-4363DiVA: diva2:11963
Presentation
2007-05-25, FA31, Albanova Universitetscentrum, Roslagstullsbacken 21, Stockholm, 14:00
Opponent
Supervisors
Note
QC 20101115Available from: 2007-05-10 Created: 2007-05-10 Last updated: 2010-11-15Bibliographically approved
List of papers
1. Analysis of reactivity determination methods in the subcritical experiment Yalina
Open this publication in new window or tab >>Analysis of reactivity determination methods in the subcritical experiment Yalina
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2005 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 554, no 1-3, 374-383 p.Article in journal (Refereed) Published
Abstract [en]

Different reactivity determination methods have been investigated, based on experiments performed at the subcritical assembly Yalina in Minsk, Belarus. The development of techniques for on-line monitoring of the reactivity level in a future accelerator-driven system (ADS) is of major importance for safe operation. Since an ADS is operating in a subcritical mode, the safety margin to criticality must be sufficiently large. The investigated methods are the Slope Fit Method, the Sjostrand Method and the Source Jerk Method. The results are compared with Monte Carlo simulations performed with different nuclear data libraries. The results of the Slope Fit Method are in good agreement with the Monte Carlo simulation results, whereas the Sjostrand Method appears to underestimate the criticality somewhat. The Source Jerk Method is subject to inadequate statistical accuracy.

Keyword
Yalina, reactivity determination, subcritical, MCNP, ADS, ACCELERATOR-DRIVEN SYSTEMS, KINETICS
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-12677 (URN)10.1016/j.nima.2005.07.058 (DOI)000233978500033 ()2-s2.0-27844541305 (Scopus ID)
Note
QC 20100621Available from: 2010-05-05 Created: 2010-05-05 Last updated: 2017-12-12Bibliographically approved
2. Pulsed neutron source measurements in the subcritical ADS experiment YALINA-Booster
Open this publication in new window or tab >>Pulsed neutron source measurements in the subcritical ADS experiment YALINA-Booster
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2008 (English)In: Annals of Nuclear Energy, ISSN 0306-4549, E-ISSN 1873-2100, Vol. 35, no 12, 2357-2364 p.Article in journal (Refereed) Published
Abstract [en]

A subcritical zero-power source-driven coupled core, the YALINA-Booster. has been constructed for experimental investigations of neutron kinetics of source-driven systems. In this study, the reactivity of two subcritical configurations has been determined by the area ratio method. The prompt neutron decay constants have been evaluated through slope fitting of the prompt neutron decay as well as through the pulsed Rossi-alpha method. It is shown that the slope fitting method and the pulsed Rossi-alpha method give stable results whereas the area ratio method results show spatial dependence. The reasons for the spatial spread are addressed.

Keyword
REACTIVITY DETERMINATION
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-12370 (URN)10.1016/j.anucene.2008.07.011 (DOI)000261729300023 ()2-s2.0-55949092840 (Scopus ID)
Note
QC 20101115Available from: 2010-04-12 Created: 2010-04-12 Last updated: 2017-12-12Bibliographically approved

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