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A COMPARISON BETWEEN TIME DOMAIN AND FREQUENCY DOMAIN CALCULATIONS OF STATIONARY NEUTRON FLUCTUATIONS

Viebach M., Lange C., Kliem S., Demazière C., Rohde U., Hennig D. and Hurtado A.


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        <foaf:name>Viebach M., Lange C., Kliem S., Demazière C., Rohde U., Hennig D. and Hurtado A.</foaf:name>
        <foaf:givenName>Lange C., Kliem S., Demazière C., Rohde U., Hennig D. and Hurtado A.</foaf:givenName>
        <foaf:familyName>Viebach M.</foaf:familyName>
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    <dct:title>A COMPARISON BETWEEN TIME DOMAIN AND FREQUENCY DOMAIN CALCULATIONS OF STATIONARY NEUTRON FLUCTUATIONS</dct:title>
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    <dcat:keyword>neutron noise, DYN3D, CORE SIM</dcat:keyword>
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    <dct:description>&lt;p&gt;Unexplained neutron flux fluctuation patterns observed in some reactors were recently&lt;br&gt; investigated by various European institutions. The time-domain code DYN3D is one of&lt;br&gt; the tools used for simulating these fluctuations. Though, the applicability of time-domain&lt;br&gt; codes for modelling small stationary fluctuations remains a discussed question.&lt;br&gt; Aiming at a confirmation that these codes may be applied for neutron noise calculations,&lt;br&gt; two special cases of neutron flux oscillations have been simulated with DYN3D and with&lt;br&gt; CORE SIM, the latter one being validated for the context here. The comparison between&lt;br&gt; the results of these two codes is the subject of this paper.&lt;br&gt; This study demonstrates that time- and frequency-dependent calculations can give qualitatively&lt;br&gt; equivalent results but substantial quantitative deviations may occur. Nevertheless,&lt;br&gt; DYN3D may be considered as qualified for neutron-noise calculations as the deviations&lt;br&gt; are smaller than 20 %. The optimization of the DYN3D setup is a matter of future research.&lt;/p&gt;</dct:description>
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    <dct:title>Core monitoring techniques and experimental validation and demonstration</dct:title>
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