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Studies of the Reactivity Effect of Polythene in the Fast Reactor FR0

Abstract

Measurements of the reactivity effect of polythene (CH{sub 2}){sub n} have been made in two FR0 assemblies having neutron spectra broadly similar to those of current steam cooled fast reactor concepts. The experiments include studies of the axial and radial distributions of the reactivity coefficient. The reactivity contributions from small polythene samples were found to be approximately additive. No large effects of heterogeneity or interaction between samples were observed. Comparisons with calculations using a homogeneous model are therefore relevant. The experimental results are largely in reasonable agreement with calculated values. The latter are very sensitive to moderate changes in the cross sections at low neutron energies. The agreement with experiment is improved if transport rather than diffusion theory is used. Although the geometrical size of FR0 is probably adequate for studies of steam coefficients in fast power reactors, Pu isotopes and fission products should be included in the core composition in order to obtain information of direct use in such studies.
Publication Date:
Dec 15, 1967
Product Type:
Technical Report
Report Number:
AE-305
Resource Relation:
Other Information: 11 refs., 7 figs.
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; POLYETHYLENES; REACTIVITY; FR-0 REACTOR; REACTIVITY COEFFICIENTS
OSTI ID:
20956291
Research Organizations:
AB Atomenergi, Nykoeping (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
TRN: SE0708725
Availability:
Commercial reproduction prohibited; OSTI as DE20956291
Submitting Site:
SWDN
Size:
30 pages
Announcement Date:
Dec 29, 2007

Citation Formats

Tiren, I, and Haakansson, R. Studies of the Reactivity Effect of Polythene in the Fast Reactor FR0. Sweden: N. p., 1967. Web.
Tiren, I, & Haakansson, R. Studies of the Reactivity Effect of Polythene in the Fast Reactor FR0. Sweden.
Tiren, I, and Haakansson, R. 1967. "Studies of the Reactivity Effect of Polythene in the Fast Reactor FR0." Sweden.
@misc{etde_20956291,
title = {Studies of the Reactivity Effect of Polythene in the Fast Reactor FR0}
author = {Tiren, I, and Haakansson, R}
abstractNote = {Measurements of the reactivity effect of polythene (CH{sub 2}){sub n} have been made in two FR0 assemblies having neutron spectra broadly similar to those of current steam cooled fast reactor concepts. The experiments include studies of the axial and radial distributions of the reactivity coefficient. The reactivity contributions from small polythene samples were found to be approximately additive. No large effects of heterogeneity or interaction between samples were observed. Comparisons with calculations using a homogeneous model are therefore relevant. The experimental results are largely in reasonable agreement with calculated values. The latter are very sensitive to moderate changes in the cross sections at low neutron energies. The agreement with experiment is improved if transport rather than diffusion theory is used. Although the geometrical size of FR0 is probably adequate for studies of steam coefficients in fast power reactors, Pu isotopes and fission products should be included in the core composition in order to obtain information of direct use in such studies.}
place = {Sweden}
year = {1967}
month = {Dec}
}