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Spatial and Source Multiplication Effects on the Area Ratio Reactivity Determination Method in a Strongly Heterogeneous Subcritical System
KTH, School of Engineering Sciences (SCI), Physics, Reactor Physics.
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2010 (English)In: Nuclear science and engineering, ISSN 0029-5639, E-ISSN 1943-748X, Vol. 166, no 2, 134-144 p.Article in journal (Refereed) Published
Abstract [en]

The area ratio method of Sjostrand is generally considered one of the most reliable reactivity determination methods and thus is a major candidate for off-line calibration purposes in future accelerator-driven systems for high-level waste incineration. In this work, the Sjostrand area ratio method has been evaluated experimentally under thorough conditions in the strongly heterogeneous subcritical facility YALINA-Booster. Both strengths and weaknesses of the method have been identified. Most surprisingly, it has been found that the area ratio reactivity estimates may differ a factor of 2 depending on detector position. It is also shown that this strong spatial dependence can be explained based on a simple two-region point-kinetics model and corrected by means of correction factors obtained through Monte Carlo simulations. A new Monte Carlo correction method is proposed that includes, at the same time, the spatial disturbance and the effective delayed neutron fraction. In that way, the value of the effective multiplication factor is obtained from the measured dollar reactivity without the need of calculating the effective delayed neutron fraction explicitly, and thereby, the delayed neutron transport is performed only once. Further, it has been found that the Sjostrand area ratio method is not sensitive to perturbations of the source multiplication factor.

Place, publisher, year, edition, pages
2010. Vol. 166, no 2, 134-144 p.
Keyword [en]
Accelerator driven system, Area ratios, Correction factors, Correction method, Delayed neutrons, Detector positions, Effective delayed neutron fraction, Effective multiplication factor, MONTE CARLO, Monte Carlo Simulation, Point-kinetics models, Reactivity determination, Source multiplication, Spatial dependence, Subcritical systems, Computer simulation, Neutrons, Reactivity (nuclear), Waste incineration
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-13581ISI: 000282239100004Scopus ID: 2-s2.0-77958063824OAI: oai:DiVA.org:kth-13581DiVA: diva2:326023
Note
QC 20100621. Uppdaterad från accepted till published (20101203).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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