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**Harvard**

Sunde, C., Demazière, C. och Pázsit, I. (2007) *Investigation of the validity of the point-kinetic approximation and of the break-frequency method in 2-D subcritical systems*.

** BibTeX **

@conference{

Sunde2007,

author={Sunde, Carl and Demazière, Christophe and Pázsit, Imre},

title={Investigation of the validity of the point-kinetic approximation and of the break-frequency method in 2-D subcritical systems},

booktitle={Joint International Topical Meeting on Mathematics & Computation and Supercomputing in Nuclear Applications, Monterey April 15-19, 2007},

abstract={The accuracy and applicability of the break-frequency method for estimating the reactivity in a
subcritical 2-D, 2-group reflected system with a distributed source is investigated for two different
system sizes. The source is distributed according to the static thermal flux. This method could be useful
in power reactor cores during loading conditions for determining the subcriticality. The validity of the
point-kinetic approximation in the same systems is also tested. A neutron noise simulator is used to
calculate the actual neutron noise induced by fluctuations of the source which is compared with the
analytically calculated point-kinetic term. The break-frequency method is used to estimate the
reactivity from the neutron noise calculated by the simulator. The conclusion of this work is that the
point-kinetic approximation in general is not valid in 2-D, 2-group reflected systems and hence the
break-frequency method is not valid either.},

year={2007},

keywords={point-kinetic, break-frequency, reactivity, reflected system, subcritical system},

}

** RefWorks **

RT Conference Proceedings

SR Print

ID 40029

A1 Sunde, Carl

A1 Demazière, Christophe

A1 Pázsit, Imre

T1 Investigation of the validity of the point-kinetic approximation and of the break-frequency method in 2-D subcritical systems

YR 2007

T2 Joint International Topical Meeting on Mathematics & Computation and Supercomputing in Nuclear Applications, Monterey April 15-19, 2007

AB The accuracy and applicability of the break-frequency method for estimating the reactivity in a
subcritical 2-D, 2-group reflected system with a distributed source is investigated for two different
system sizes. The source is distributed according to the static thermal flux. This method could be useful
in power reactor cores during loading conditions for determining the subcriticality. The validity of the
point-kinetic approximation in the same systems is also tested. A neutron noise simulator is used to
calculate the actual neutron noise induced by fluctuations of the source which is compared with the
analytically calculated point-kinetic term. The break-frequency method is used to estimate the
reactivity from the neutron noise calculated by the simulator. The conclusion of this work is that the
point-kinetic approximation in general is not valid in 2-D, 2-group reflected systems and hence the
break-frequency method is not valid either.

LA eng

OL 30