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**Harvard**

Demazière, C. och Pázsit, I. (2005) *On the possibility of the space-dependence of the stability indicator (decay ratio) of a BWR*.

** BibTeX **

@article{

Demazière2005,

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

title={On the possibility of the space-dependence of the stability indicator (decay ratio) of a BWR},

journal={Annals of Nuclear Energy},

issn={0306-4549},

volume={32},

issue={12},

pages={1305-1322},

abstract={A model is proposed for the explanation of the space-dependence of the so-called decay ratio (DR) which is used to quantify the stability properties of boiling water reactors (BWRs). The study was prompted by the observation of a strongly space-dependent decay ratio in an instability event at the Swedish Forsmark-1 BWR. Prior to that event, the space-dependence of the DR was neither observed, nor assumed possible in the theoretical models of instability. The model proposed here is based on a previous suggestion by one of the authors on how to model the estimation of the DR in case of two different types of oscillations (instabilities) being present in the core simultaneously. The model was earlier only used in a space-independent form, but here its applicability is extended such that space-dependence of the oscillations is also accounted for, by using a noise simulator. The investigations show that the DR, as determined by the individual LPRMs (neutron detectors) at different positions, can be strongly space-dependent if at least two different oscillations with differing DR and space-dependence exist in the core simultaneously. The observed space-dependence of the DR in the Forsmark case can be reconstructed by the model.},

year={2005},

keywords={BWR stability, noise analysis, decay ratio, space-dependence, core calculations},

}

** RefWorks **

RT Journal Article

SR Electronic

ID 6067

A1 Demazière, Christophe

A1 Pázsit, Imre

T1 On the possibility of the space-dependence of the stability indicator (decay ratio) of a BWR

YR 2005

JF Annals of Nuclear Energy

SN 0306-4549

VO 32

IS 12

SP 1305

OP 1322

AB A model is proposed for the explanation of the space-dependence of the so-called decay ratio (DR) which is used to quantify the stability properties of boiling water reactors (BWRs). The study was prompted by the observation of a strongly space-dependent decay ratio in an instability event at the Swedish Forsmark-1 BWR. Prior to that event, the space-dependence of the DR was neither observed, nor assumed possible in the theoretical models of instability. The model proposed here is based on a previous suggestion by one of the authors on how to model the estimation of the DR in case of two different types of oscillations (instabilities) being present in the core simultaneously. The model was earlier only used in a space-independent form, but here its applicability is extended such that space-dependence of the oscillations is also accounted for, by using a noise simulator. The investigations show that the DR, as determined by the individual LPRMs (neutron detectors) at different positions, can be strongly space-dependent if at least two different oscillations with differing DR and space-dependence exist in the core simultaneously. The observed space-dependence of the DR in the Forsmark case can be reconstructed by the model.

LA eng

DO 10.1016/j.anucene.2005.04.007

LK http://dx.doi.org/10.1016/j.anucene.2005.04.007

OL 30