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Science and Technology of Nuclear Installations
Volume 2012 (2012), Article ID 629039, 13 pages
Research Article

Interpretation of Local Flux Measurements in Subcritical Systems and Reactivity Determination

Dipartimento Energia, Politecnico Di Torino, Corso Duca degli Abruzzi, 24-10129 Torino, Italy

Received 9 January 2012; Accepted 28 February 2012

Academic Editor: Alberto Talamo

Copyright © 2012 S. Dulla and P. Ravetto. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The determination of the subcriticality level constitutes an important issue in the assessment of the accelerator-driven system technology. For this purpose, the interpretation of flux measurements requires a lumped-parameter model employed in an inverse fashion. This papers addresses the drawbacks of point kinetics in performing such a task. In particular, the problem of the generation of integral parameters is considered, in connection with the use of a shape function and of a projection weight tailored to the neutron flux detector. Furthermore, the question of the generation of the effective source is analysed, and some proposals to modify the time dependence of such a function to account for the time delay at the flux detector are presented and discussed.