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Measurement of the Effective Delayed Neutron Fraction in Three Different FR0-cores

Abstract

The effective delayed neutron fraction, beta{sub eff}, has been measured in the three cores 3, 5 and 8 of the fast zero-power reactor FR0. The variance-to-mean method, in which the statistical fluctuations of the neutron density in the reactor is studied, was used. A 3He-gas scintillator was placed in the reflector and used as a neutron detector. It was made more sensitive to fast neutrons by surrounding it with polythene. Its efficiency, expressed as the number of counts per fission in the reactor, was determined using fission chambers with known efficiency placed in the core. The space distribution of the fission rate in the core was determined by foil activation technique. The experimental results were compared with theoretical beta{sub eff}-values calculated with perturbation theory. The difference was about 3 % which is of the same order as the accuracy in the experimental values
Publication Date:
Jun 15, 1972
Product Type:
Technical Report
Report Number:
AE-456
Resource Relation:
Other Information: 22 refs., 9 figs., 14 tabs.
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; DELAYED NEUTRON FRACTION; HE-3 COUNTERS; ACCURACY; FR-0 REACTOR; REACTIVITY
OSTI ID:
922513
Research Organizations:
AB Atomenergi, Nykoeping (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
TRN: SE0808058
Availability:
Commercial reproduction prohibited; OSTI as DE00922513
Submitting Site:
SWDN
Size:
44 pages
Announcement Date:
Jan 25, 2008

Citation Formats

Moberg, L, and Kockum, J. Measurement of the Effective Delayed Neutron Fraction in Three Different FR0-cores. Sweden: N. p., 1972. Web.
Moberg, L, & Kockum, J. Measurement of the Effective Delayed Neutron Fraction in Three Different FR0-cores. Sweden.
Moberg, L, and Kockum, J. 1972. "Measurement of the Effective Delayed Neutron Fraction in Three Different FR0-cores." Sweden.
@misc{etde_922513,
title = {Measurement of the Effective Delayed Neutron Fraction in Three Different FR0-cores}
author = {Moberg, L, and Kockum, J}
abstractNote = {The effective delayed neutron fraction, beta{sub eff}, has been measured in the three cores 3, 5 and 8 of the fast zero-power reactor FR0. The variance-to-mean method, in which the statistical fluctuations of the neutron density in the reactor is studied, was used. A 3He-gas scintillator was placed in the reflector and used as a neutron detector. It was made more sensitive to fast neutrons by surrounding it with polythene. Its efficiency, expressed as the number of counts per fission in the reactor, was determined using fission chambers with known efficiency placed in the core. The space distribution of the fission rate in the core was determined by foil activation technique. The experimental results were compared with theoretical beta{sub eff}-values calculated with perturbation theory. The difference was about 3 % which is of the same order as the accuracy in the experimental values}
place = {Sweden}
year = {1972}
month = {Jun}
}