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**Harvard**

Demazière, C. och Glöckler, O. (2004) *On-line determination of the prompt fraction of in-core neutron detectors in CANDU reactors*. : External organization

** BibTeX **

@conference{

Demazière2004,

author={Demazière, Christophe and Glöckler, Oszvald},

title={On-line determination of the prompt fraction of in-core neutron detectors in CANDU reactors},

booktitle={Proc. Int. Mtg. The Physics of Fuel Cycles and Advanced Nuclear Systems: Global Developments (PHYSOR2004)},

isbn={0-89448-683-7},

abstract={This paper describes a new method for determining the prompt fraction of in-core neutron detectors in CANDU reactors. The method is based on noise analysis, and thus does not require any perturbation of the reactor operation. This method is therefore very well suited to on-line monitoring, and could detect early detector degradation as the detectors age. The prompt fraction estimation of the in-core neutron detectors is of prime importance in CANDU reactors, since these detectors are used by the reactor shutdown systems, and should consequently respond very quickly to any flux change. This new method is based on the fluctuations of the light water levels in the water compartments at a frequency of roughly 0.25 Hz. These fluctuations are due to the control cycle of the regulating system of the reactor, and are equivalent to a spatially-distributed noise source of variable strength. The induced neutron noise can be monitored by the in-core neutron detectors, but only the prompt component of these detectors is able to follow these fluctuations at 0.25 Hz. Comparing the measured detector signals to the neutron noise estimated by core calculations allow determining the prompt fraction of the detectors.},

publisher={External organization},

year={2004},

keywords={prompt fraction, neutron detector, noise analysis, dynamic reactor transfer function, core calculations},

}

** RefWorks **

RT Conference Proceedings

SR Print

ID 1737

A1 Demazière, Christophe

A1 Glöckler, Oszvald

T1 On-line determination of the prompt fraction of in-core neutron detectors in CANDU reactors

YR 2004

T2 Proc. Int. Mtg. The Physics of Fuel Cycles and Advanced Nuclear Systems: Global Developments (PHYSOR2004)

SN 0-89448-683-7

AB This paper describes a new method for determining the prompt fraction of in-core neutron detectors in CANDU reactors. The method is based on noise analysis, and thus does not require any perturbation of the reactor operation. This method is therefore very well suited to on-line monitoring, and could detect early detector degradation as the detectors age. The prompt fraction estimation of the in-core neutron detectors is of prime importance in CANDU reactors, since these detectors are used by the reactor shutdown systems, and should consequently respond very quickly to any flux change. This new method is based on the fluctuations of the light water levels in the water compartments at a frequency of roughly 0.25 Hz. These fluctuations are due to the control cycle of the regulating system of the reactor, and are equivalent to a spatially-distributed noise source of variable strength. The induced neutron noise can be monitored by the in-core neutron detectors, but only the prompt component of these detectors is able to follow these fluctuations at 0.25 Hz. Comparing the measured detector signals to the neutron noise estimated by core calculations allow determining the prompt fraction of the detectors.

PB External organization

LA eng

OL 30