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**Harvard**

Demazière, C. och Pázsit, I. (2009) *Numerical tools applied to power reactor noise analysis*.

** BibTeX **

@article{

Demazière2009,

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

title={Numerical tools applied to power reactor noise analysis},

journal={Progress in nuclear energy},

issn={0149-1970},

volume={51},

issue={1},

pages={67 - 81},

abstract={In order to be able to calculate the space- and frequency-dependent neutron noise in real inhomogeneous systems in
two-group theory, a code was developed for the calculation of the Greens function (dynamic transfer function) of such systems. This paper reports on the development as well as the test and application of the numerical tools employed. The code developed yields the space-dependence of the fluctuations of the neutron flux induced by fluctuating properties of the medium in the 2-group diffusion approximation and in a two-dimensional representation of heterogeneous systems, for both critical systems
and non-critical systems with an external source. Some
applications of these tools to power reactor noise analysis are then described, including the unfolding of the parameters of the noise source from the induced neutron noise, measured at a few discrete locations throughout the core. Other concrete applications concern the study of the space-dependence of the Decay Ratio in Boiling Water Reactors, the noise-based estimation of the Moderator Temperature Coefficient of reactivity in Pressurized Water Reactors, the modeling of the beam- and shell-mode core-barrel vibrations in Pressurized Water Reactors, and the investigation of the validity of the point-kinetic approximation in subcritical systems driven by an external source.
In most of these applications, calculations performed using the
code are compared with at-power plant measurements. Power reactor
noise analysis applications of the above type, i.e. core
monitoring without disturbing plant operation, is of particular
interest in the framework of the extensive program of power
uprates worldwide.},

year={2009},

keywords={Neutron noise, noise diagnostics, numerical methods, noise simulator, Green's function},

}

** RefWorks **

RT Journal Article

SR Electronic

ID 79836

A1 Demazière, Christophe

A1 Pázsit, Imre

T1 Numerical tools applied to power reactor noise analysis

YR 2009

JF Progress in nuclear energy

SN 0149-1970

VO 51

IS 1

SP 67

OP 81

AB In order to be able to calculate the space- and frequency-dependent neutron noise in real inhomogeneous systems in
two-group theory, a code was developed for the calculation of the Greens function (dynamic transfer function) of such systems. This paper reports on the development as well as the test and application of the numerical tools employed. The code developed yields the space-dependence of the fluctuations of the neutron flux induced by fluctuating properties of the medium in the 2-group diffusion approximation and in a two-dimensional representation of heterogeneous systems, for both critical systems
and non-critical systems with an external source. Some
applications of these tools to power reactor noise analysis are then described, including the unfolding of the parameters of the noise source from the induced neutron noise, measured at a few discrete locations throughout the core. Other concrete applications concern the study of the space-dependence of the Decay Ratio in Boiling Water Reactors, the noise-based estimation of the Moderator Temperature Coefficient of reactivity in Pressurized Water Reactors, the modeling of the beam- and shell-mode core-barrel vibrations in Pressurized Water Reactors, and the investigation of the validity of the point-kinetic approximation in subcritical systems driven by an external source.
In most of these applications, calculations performed using the
code are compared with at-power plant measurements. Power reactor
noise analysis applications of the above type, i.e. core
monitoring without disturbing plant operation, is of particular
interest in the framework of the extensive program of power
uprates worldwide.

LA eng

DO 10.1016/j.pnucene.2008.01.010

LK http://dx.doi.org/10.1016/j.pnucene.2008.01.010

OL 30