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Comparisons of Measured and Calculated Neutron Fluxes in Laminated iron and Heavy Water

Abstract

Measurements of neutron fluxes have been performed in configurations depicting the regions extending radially and axially outwards from the core of a PHWR reactor in order to test the accuracy of the available methods in shield design on thin alternating laminae of Fe and D{sub 2}O. A 'dry' experimental set-up was constructed, i.e. the D{sub 2}O was contained in flat tanks made of Al. The first set of measurements was performed through solid Fe and D{sub 2}O layers, and only the results of these experiments are described in this report. The set-up allowed measurements also in a mock-up of a reactor top penetrated by D{sub 2}O or air-filled channels (to be reported later). The results are compared to fluxes calculated by the British 18-group removal-diffusion method and by the NRN method developed at AE. The results show that the values predicted may be expected to be within a factor of 2 from the true values in most cases. The predicted relative flux distributions follow the observed ones with a very good accuracy in spite of the apparent misuse of diffusion theory for the thin regions in question. Finally, it is shown that the predicted change in the fast spectrum while  More>>
Authors:
Publication Date:
Oct 15, 1964
Product Type:
Technical Report
Report Number:
AE-161
Resource Relation:
Other Information: 62 refs., 37 figs., 29 tab.
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; SHIELDING; CONCRETES; ATTENUATION; GAMMA RADIATION; ACCURACY; NEUTRON TRANSPORT THEORY; PHWR TYPE REACTORS; NEUTRON FLUX; IRON
OSTI ID:
20931025
Research Organizations:
AB Atomenergi, Nykoeping (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
TRN: SE0708417
Availability:
Commercial reproduction prohibited; OSTI as DE20931025
Submitting Site:
SWDN
Size:
20 pages
Announcement Date:
Sep 29, 2007

Citation Formats

Aalto, E. Comparisons of Measured and Calculated Neutron Fluxes in Laminated iron and Heavy Water. Sweden: N. p., 1964. Web.
Aalto, E. Comparisons of Measured and Calculated Neutron Fluxes in Laminated iron and Heavy Water. Sweden.
Aalto, E. 1964. "Comparisons of Measured and Calculated Neutron Fluxes in Laminated iron and Heavy Water." Sweden.
@misc{etde_20931025,
title = {Comparisons of Measured and Calculated Neutron Fluxes in Laminated iron and Heavy Water}
author = {Aalto, E}
abstractNote = {Measurements of neutron fluxes have been performed in configurations depicting the regions extending radially and axially outwards from the core of a PHWR reactor in order to test the accuracy of the available methods in shield design on thin alternating laminae of Fe and D{sub 2}O. A 'dry' experimental set-up was constructed, i.e. the D{sub 2}O was contained in flat tanks made of Al. The first set of measurements was performed through solid Fe and D{sub 2}O layers, and only the results of these experiments are described in this report. The set-up allowed measurements also in a mock-up of a reactor top penetrated by D{sub 2}O or air-filled channels (to be reported later). The results are compared to fluxes calculated by the British 18-group removal-diffusion method and by the NRN method developed at AE. The results show that the values predicted may be expected to be within a factor of 2 from the true values in most cases. The predicted relative flux distributions follow the observed ones with a very good accuracy in spite of the apparent misuse of diffusion theory for the thin regions in question. Finally, it is shown that the predicted change in the fast spectrum while penetrating these set-ups should be confirmable with certain threshold detectors.}
place = {Sweden}
year = {1964}
month = {Oct}
}