Dependence of post-drop reactivity on data analysis model for rod drop experiment in a subcritical reactor with external source

Conference · Sat Jul 01 04:00:00 EDT 2006

OSTI ID:22039718

Taninaka, H ^[1]; Hashimoto, K ^[2]

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1. Interdisciplinary Graduate School of Science and Technology, Kinki Univ., 3-4-1, Kowakae, Higashi-Osaka, 577-8502 (Japan)
2. Atomic Energy Research Inst., Kinki Univ., 3-4-1, Kowakae, Higashi-Osaka, 577-8502 (Japan)

This paper presents an improved rod-drop reactivity and source strength measurement by the inverse kinetics method in subcritical reactor system. The inverse kinetics method extended to be applicable to subcritical system, which is referred to as least squares inverse kinetics method (LSIKM), can estimate both the reactivity and the external source strength by applying least square approximation. However, the application of the conventional fitting model of the LSIKM to fluctuating data leads to serious errors in the estimation. In this study, a specific fitting model proposed by Itagaki and Kitano is used for the LSIKM and the effectiveness for fluctuating data is demonstrated experimentally. Furthermore, the spatial dependence of the estimated results is investigated and the reduction method is proposed. (authors)

• Research Organization: American Nuclear Society, 555 North Kensington Avenue, La Grange Park, IL 60526 (United States)
• OSTI ID: 22039718
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
97 MATHEMATICS AND COMPUTING
DATA ANALYSIS
ERRORS
LEAST SQUARE FIT
NEUTRON SOURCES
REACTIVITY
REACTOR KINETICS
ROD DROP ACCIDENTS
SPACE DEPENDENCE
SUBCRITICAL ASSEMBLIES