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Title: Epithermal Inverse Kinetic Measurements and Their Interpretation Using a Two-Group Point-Kinetic Model

Abstract

Two of the methods that can be used for the measurement of the subcriticality of a multiplying system are the inverse kinetic (IK) and the pulsed neutron source (PNS) techniques. These methods depend considerably on correction factors and/or kinetic parameters, which usually need to be calculated using the same neutronic codes as those being validated via the experiments. The use of epithermal detectors to reduce the dependence of area-ratio PNS measurements on calculated correction factors was reported previously. In the current work, for the first time, epithermal detectors have been used for IK measurements. As in the case of the PNS experiments, these were carried out in core/reflector configurations with large spatial effects, systematic comparisons with thermal measurements clearly bringing out the considerably lower sensitivity of the epithermal IK results to calculational corrections. A new two-group point-kinetic model has currently been developed as an extension of the usual theoretical basis (employing a single energy group) for analyzing kinetic experiments. This has been essential for justifying the analysis methodology employed for the epithermal IK measurements.

Authors:
 [1];  [1];  [2]
  1. Swiss Federal Institute of Technology (Switzerland)
  2. Paul Scherrer Institute (Switzerland)
Publication Date:
OSTI Identifier:
20804633
Resource Type:
Journal Article
Journal Name:
Nuclear Science and Engineering
Additional Journal Information:
Journal Volume: 135; Journal Issue: 1; Other Information: Copyright (c) 2006 American Nuclear Society (ANS), United States, All rights reserved. http://epubs.ans.org/; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0029-5639
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; COMPARATIVE EVALUATIONS; CONFIGURATION; CORRECTIONS; CRITICALITY; NEUTRON SOURCES; NEUTRON TRANSPORT; SENSITIVITY

Citation Formats

Rosselet, Marc, Chawla, Rakesh, and Williams, Tony. Epithermal Inverse Kinetic Measurements and Their Interpretation Using a Two-Group Point-Kinetic Model. United States: N. p., 2000. Web. doi:10.13182/NSE99-33.
Rosselet, Marc, Chawla, Rakesh, & Williams, Tony. Epithermal Inverse Kinetic Measurements and Their Interpretation Using a Two-Group Point-Kinetic Model. United States. doi:10.13182/NSE99-33.
Rosselet, Marc, Chawla, Rakesh, and Williams, Tony. Mon . "Epithermal Inverse Kinetic Measurements and Their Interpretation Using a Two-Group Point-Kinetic Model". United States. doi:10.13182/NSE99-33.
@article{osti_20804633,
title = {Epithermal Inverse Kinetic Measurements and Their Interpretation Using a Two-Group Point-Kinetic Model},
author = {Rosselet, Marc and Chawla, Rakesh and Williams, Tony},
abstractNote = {Two of the methods that can be used for the measurement of the subcriticality of a multiplying system are the inverse kinetic (IK) and the pulsed neutron source (PNS) techniques. These methods depend considerably on correction factors and/or kinetic parameters, which usually need to be calculated using the same neutronic codes as those being validated via the experiments. The use of epithermal detectors to reduce the dependence of area-ratio PNS measurements on calculated correction factors was reported previously. In the current work, for the first time, epithermal detectors have been used for IK measurements. As in the case of the PNS experiments, these were carried out in core/reflector configurations with large spatial effects, systematic comparisons with thermal measurements clearly bringing out the considerably lower sensitivity of the epithermal IK results to calculational corrections. A new two-group point-kinetic model has currently been developed as an extension of the usual theoretical basis (employing a single energy group) for analyzing kinetic experiments. This has been essential for justifying the analysis methodology employed for the epithermal IK measurements.},
doi = {10.13182/NSE99-33},
journal = {Nuclear Science and Engineering},
issn = {0029-5639},
number = 1,
volume = 135,
place = {United States},
year = {2000},
month = {5}
}