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Lee, Deokjung
Computational Reactor physics & Experiment Lab.
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Application of advanced Rossi-alpha technique to reactivity measurements at Kyoto University Critical Assembly

Author(s)
Kong, ChidongChoe, JiwonYum, SeongpilJang, JaerimLee, WoongheeKim, HanjooKim, WonkyeongNguyen, Kjang Hoang NhatNguyen, Tung Dong CaoDos, VutheamLee, DeokjungShin, Ho CheolYamanaka, MasaoPyeon, Cheol Ho
Issued Date
2018-08
DOI
10.1016/j.anucene.2018.04.009
URI
https://scholarworks.unist.ac.kr/handle/201301/24252
Fulltext
https://www.sciencedirect.com/science/article/pii/S0306454918301889?via%3Dihub
Citation
ANNALS OF NUCLEAR ENERGY, v.118, pp.92 - 98
Abstract
This study presents the first application of the advanced Rossi-alpha method (theoretically introduced by Kong et al., 2014) on the reactivity measurements in a research reactor: detector count signals at the Kyoto University Critical Assembly (KUCA) facility. The detector signals in the KUCA A-type core are analyzed by three subcriticality measurement methods: (1) Feynman-alpha (F-α) method, (2) Rossi-alpha (R-α) method, and (3) advanced Rossi-alpha (advanced R-α) method. Four cases are analyzed for two different subcritical states of the core and two different neutron source locations. Two different negative reactivity ρ values are obtained by the measurements of control rod worth and regarded as the reference reactivity values, comparing the results by the four methods. The F-α shows reactivity errors ranging between 7.1 and 7.3% due to its use of variance-to-mean ratios of detector count signals, which are not very sensitive to neutron background noise. However, the fitting uncertainties associated to the F-α results are large, ranging between 5.4 and 12.8% at one standard deviation. The R-α shows small fitting uncertainties ranging between 2.8 and 3.8%, although reactivity errors are in the range of 3.5-26.5% due to the neutron background noise. Finally, the advanced R-α that explicitly models the neutron background noise contrary to the previous methods shows the reactivity errors in the range of 1.0-11.8%, and provides the lowest uncertainties of the measured ρ in the range of 0.4-0.9%. In conclusion, among the four methods applied to the reactivity measurements at KUCA, the advanced R-α reveals the best accuracy with the lowest uncertainties.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
ISSN
0306-4549
Keyword (Author)
Advanced Rossi-alphaDetector count signalsFyenman-alphaNuclear research reactorRossi-alpha
Keyword
ACCELERATOR-DRIVEN SYSTEMREACTORSUBCRITICALITYBENCHMARKSFEASIBILITY

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