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Theoretical and Experimental Analysis of Fast Neutron Spectra

Conference:

Abstract

The reactor physics division of the Inter-Academic Reactor Institute at Delft is concentrating its efforts in the field of fast reactor physics on problems of a more fundamental nature. The object of the programme is to determine experimentally a number of microscopic reactor physics parameters such as conversion potentials, fission ratios and Doppler coefficients for simple geometries and material compositions. Because of the extreme importance of knowledge of the neutron spectrum for the interpretation of the results, attention has initially been concentrated on both the measurement and the calculation of fast neutron spectra. The transport of neutrons in absorbing and non-absorbing heavy atom materials is studied by solving the Boltzmann equation. Both isotropic and anisotropic scattering are considered. Anisotropic scattering is treated by the P{sub n}-approximation, while flux-anisotropy is handled with the S{sub N}-method. In the code FAST-DELFT, scattering is treated up to the P{sub 4} component, a further extension of which is useless because of the lack of available cross-section data. By using this method, the effect of scattering anisotropy on the spectrum formation has been studied. In addition the influence of group cross-section inaccuracies was determined. The experimental work has been concentrated on methods to determine in-core spectra.  More>>
Authors:
Van Dam, H.; Kleijn, H. R. [1] 
  1. Reactor Instituut, Delft (Netherlands)
Publication Date:
Apr 15, 1968
Product Type:
Conference
Report Number:
IAEA-SM-101/4
Resource Relation:
Conference: Symposium on Fast Reactor Physics and Related Safety Problems, Karlsruhe (Germany), 30 Oct - 3 Nov 1967; Other Information: 7 refs., 6 figs., 1 tab.; Related Information: In: Fast Reactor Physics Vol. I. Proceedings of a Symposium on Fast Reactor Physics and Related Safety Problems| 566 p.
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; ANISOTROPY; BOLTZMANN EQUATION; CROSS SECTIONS; DISCRETE ORDINATE METHOD; DOPPLER COEFFICIENT; EXPERIMENTAL DATA; F CODES; FAST NEUTRONS; FAST REACTORS; FISSION RATIO; NEUTRON FLUX; NEUTRON SPECTRA; NEUTRON TRANSPORT; PROPORTIONAL COUNTERS; SCATTERING; SPHERICAL HARMONICS METHOD
OSTI ID:
22109569
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA13M0960067214
Submitting Site:
INIS
Size:
page(s) 377-387
Announcement Date:
Jul 04, 2013

Conference:

Citation Formats

Van Dam, H., and Kleijn, H. R. Theoretical and Experimental Analysis of Fast Neutron Spectra. IAEA: N. p., 1968. Web.
Van Dam, H., & Kleijn, H. R. Theoretical and Experimental Analysis of Fast Neutron Spectra. IAEA.
Van Dam, H., and Kleijn, H. R. 1968. "Theoretical and Experimental Analysis of Fast Neutron Spectra." IAEA.
@misc{etde_22109569,
title = {Theoretical and Experimental Analysis of Fast Neutron Spectra}
author = {Van Dam, H., and Kleijn, H. R.}
abstractNote = {The reactor physics division of the Inter-Academic Reactor Institute at Delft is concentrating its efforts in the field of fast reactor physics on problems of a more fundamental nature. The object of the programme is to determine experimentally a number of microscopic reactor physics parameters such as conversion potentials, fission ratios and Doppler coefficients for simple geometries and material compositions. Because of the extreme importance of knowledge of the neutron spectrum for the interpretation of the results, attention has initially been concentrated on both the measurement and the calculation of fast neutron spectra. The transport of neutrons in absorbing and non-absorbing heavy atom materials is studied by solving the Boltzmann equation. Both isotropic and anisotropic scattering are considered. Anisotropic scattering is treated by the P{sub n}-approximation, while flux-anisotropy is handled with the S{sub N}-method. In the code FAST-DELFT, scattering is treated up to the P{sub 4} component, a further extension of which is useless because of the lack of available cross-section data. By using this method, the effect of scattering anisotropy on the spectrum formation has been studied. In addition the influence of group cross-section inaccuracies was determined. The experimental work has been concentrated on methods to determine in-core spectra. Using home-made proportional counters with gamma-ray discrimination provisions fast neutron spectra have been measured in simple geometries. These experiments were complemented by foil measurements in the lower energy region. The results of this work are presented in this paper. (author)}
place = {IAEA}
year = {1968}
month = {Apr}
}