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research article

Determination of adjusted neutron spectra in different MUSE configurations by unfolding techniques

Plaschy, M.
•
Destouches, C.
•
Chawla, R.  
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2006
Journal of ASTM International

Investigations of spectrum adjustment by unfolding techniques for different locations of critical and driven subcritical MUSE4 configurations are presented. The current analysis is based on the recent accomplishment of specific foil activation measurements and on the use of the unfolding code STAY'SL in conjunction with IRDF-90 and IRDF-2002 dosimetry libraries. Specific developments have been conducted to consider the uncertainties associated with the determination of the experimental absolute reaction rates and the initial calculated spectrum in the most realistic manner. In this context, the iterative adjustment process for the neutron spectrum is established on the basis of variance/covariance matrices defined for the three types of input parameters, i.e., the experimental reaction rates, the initial spectrum, and the dosimetry nuclear data files. The results highlight the spectral variations between different locations of the MUSE4 cores, in particular the characteristic behavior of a subcritical configuration driven by an external T(d,n)He 4 (14 MeV neutrons) source. Copyright 2006 by ASTM International.

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Type
research article
DOI
10.1520/JAI13443
Author(s)
Plaschy, M.
Destouches, C.
Chawla, R.  
Beretz, D.
Mellier, F.
Serviere, H.
Fougeras, P.
Chaussonnet, P.
Domergue, C.
Laurens, J. M.
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Date Issued

2006

Publisher

American Society for Testing and Materials

Published in
Journal of ASTM International
Volume

3

Issue

3

Subjects

Neutrons

•

Activation analysis

•

Dosimetry

•

Neutron sources

•

Nuclear reactor accidents

•

Parameter estimation

•

Spectrum analysis

Note

Laboratory for Reactor Physics and Systems Behaviour (LRS), Paul Scherrer Institute (PSI), CH-5232 Villigen-PSI, Switzerland

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LRS  
Available on Infoscience
September 17, 2010
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/53882
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