Vol. XVII, No. 12, Pp. 182
December 2002
UDC 621.039+614.876:504.06
YU ISSN 14513994
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Pages: 1926
Author: Ljiljana Kostić
Abstract
Feynmanalpha and Rossialpha methods are used in traditional nuclear reactors to determine the subcritical reactivity of a system. The methods are based on the measurement of the mean value, variance and the covariance of detector counts for different measurement times. Such methods attracted renewed attention recently with the advent of the socalled accelerator driven reactors (ADS) proposed some time ago. The ADS systems, intended to be used either in energy generation or transuranium transmutation, will use a subcritical core with a strong spallation source. A spallation source has statistical properties that are different from those traditionally used by radioactive sources. In such reactors the monitoring of the subcritical reactivity is very important, and a statistical method, such as the Feynmanalpha method, is capable of resolving this problem.
Key words: neutron fluctuations, reactor noise, Feynmanalpha method, variancetomean ratio, modified variance, subcritical systems, reactivity determination, statistical methods, neutron source, stochastically pulsed source
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