NDLI: Application of the Modified Source Multiplication (MSM) technique to subcritical reactivity worth measurements in thermal and fast reactor systems

Content Provider	IEEE Xplore Digital Library
Author	Blaise, P. Mellier, F. Fougeras, P.
Copyright Year	2009
Description	Author affiliation: CEA, DEN-CAD/DER, Experimental Physics Service (SPEx), 13108 Saint Paul lez Durance, France (Mellier, F.) \|\| CEA, DEN-CAD/DER, Reactor Physics and Cycle Service (SPRC), 13108 Saint Paul lez Durance, France (Blaise, P.; Fougeras, P.)
Abstract	The Amplified Source Multiplication (ASM) method and its improved Modified Source Multiplication (MSM) method have been widely used in the CEA's EOLE and MASURCA critical facilities over the past decades for the determination of reactivity worths by using fission chambers in subcritical configurations. They have been successfully applied to absorber (single or clusters) worth measurement in both thermal and fast spectra, or for (sodium or water) void reactivity worths. The ASM methodology, which is the basic technique to estimate a reactivity worth, uses relatively simple relationships between count rates of efficient miniature fission chambers located in slightly subcritical reference and perturbed configurations. If this method works quite well for small reactivity variation (a few effective delayed neutron fraction), its raw results needs to be corrected to take into account the flux perturbation in the fission chamber. This is performed by applying to the measurement a correction factor called MSM. Its characteristics is to take into account the local space and energy variation of the spectrum in the fission chamber, through standard perturbation theory applied to neutron transport calculation in the perturbed configuration. The proposed paper describes in details both methodologies, with their associated uncertainties. Applications on absorber cluster worth in the MISTRAL-4 full MOX mock-up core and the last core loaded in MASURCA show the importance of the MSM correction on raw data.
Starting Page	1
Ending Page	9
File Size	966278
Page Count	9
File Format	PDF
ISBN	9781424452071
DOI	10.1109/ANIMMA.2009.5503677
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-07
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Performance evaluation Delay effects Measurements MSM Neutrons Calibration Perturbation Inductors Physics Density estimation robust algorithm Boron Detectors Kinetic theory ASM Subcritical
Content Type	Text
Resource Type	Article

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