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**Harvard**

Zylbersztejn, F., Tran, H., Pázsit, I., Demazière, C. och Nylén, H. (2013) *On the dependence of the noise amplitude on the correlation length of inlet temperature fluctuations in PWRs*.

** BibTeX **

@article{

Zylbersztejn2013,

author={Zylbersztejn, Florian and Tran, Hoai Nam and Pázsit, Imre and Demazière, Christophe and Nylén, Henrik},

title={On the dependence of the noise amplitude on the correlation length of inlet temperature fluctuations in PWRs},

journal={Annals of Nuclear Energy},

issn={0306-4549},

volume={57},

pages={134-141},

abstract={The dependence of the amplitude of the neutron noise in PWRs on the radial correlation length of the noise source, that is the inlet temperature fluctuations, is investigated. The motivation for this work comes from the recent observation that the noise amplitude has increased significantly in certain Spanish PWRs. The reason of this increase has not yet been satisfactorily identified, although there are a few assumptions. One new hypothesis, put forward in this paper, is that a coolant ow with more coherent characteristics, which has actually been observed, could explain the increase of the noise amplitude. A more coherent ow leads to a longer spatial (radial) correlation length of the inlet temperature fluctuations, which in turn, in case the APSD of the temperature noise is unchanged, will lead to the increase of the neutron noise APSD. The mechanism behind this phenomenon is the same as the reason of the failure of the traditional noise based method for the determination of the Moderator Temperature Coeficient (MTC), and is related to the characteristics of the spatially randomly distributed noise sources. In this paper the relationship between the radial correlation length of the inlet temperature fluctuations and the neutron noise amplitude is investigated quantitatively and the increase of the noise amplitude with the increased spatial correlation of the inlet temperature fluctuations is demonstrated.},

year={2013},

keywords={Correlation length effect; Noise amplitude; Moderator temperature fluctuation; PWRs },

}

** RefWorks **

RT Journal Article

SR Electronic

ID 173766

A1 Zylbersztejn, Florian

A1 Tran, Hoai Nam

A1 Pázsit, Imre

A1 Demazière, Christophe

A1 Nylén, Henrik

T1 On the dependence of the noise amplitude on the correlation length of inlet temperature fluctuations in PWRs

YR 2013

JF Annals of Nuclear Energy

SN 0306-4549

VO 57

SP 134

OP 141

AB The dependence of the amplitude of the neutron noise in PWRs on the radial correlation length of the noise source, that is the inlet temperature fluctuations, is investigated. The motivation for this work comes from the recent observation that the noise amplitude has increased significantly in certain Spanish PWRs. The reason of this increase has not yet been satisfactorily identified, although there are a few assumptions. One new hypothesis, put forward in this paper, is that a coolant ow with more coherent characteristics, which has actually been observed, could explain the increase of the noise amplitude. A more coherent ow leads to a longer spatial (radial) correlation length of the inlet temperature fluctuations, which in turn, in case the APSD of the temperature noise is unchanged, will lead to the increase of the neutron noise APSD. The mechanism behind this phenomenon is the same as the reason of the failure of the traditional noise based method for the determination of the Moderator Temperature Coeficient (MTC), and is related to the characteristics of the spatially randomly distributed noise sources. In this paper the relationship between the radial correlation length of the inlet temperature fluctuations and the neutron noise amplitude is investigated quantitatively and the increase of the noise amplitude with the increased spatial correlation of the inlet temperature fluctuations is demonstrated.

LA eng

DO 10.1016/j.anucene.2013.01.057

LK http://dx.doi.org/10.1016/j.anucene.2013.01.057

OL 30