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Plaige, Yves; Dessus, Bernard; Vaux, Christian.
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France)1981
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France)1981
AbstractAbstract
[en] In the reactivity meter described in this report, the input signal is a level signal in logarithmic scale, while conventionnel reactivity meter use linear signal; this feature limits the utilisation to physical measurements or particular applications. The aim of this new instrument is to be set up in control equipments of nuclear reactors, in order to make easier the control and to increase the safety. This report shows that it is possible to design a good instrument without sophisticated circuits. A prototype was built with analogical circuits, but it is possible to use a digital technology. The accuracy is not so good than that of conventional reactivity meters, but yet sufficient for control operations. Laboratory and reactor tests have confirmed the validity of this solution and the quality of measurements
[fr]
Le reactimetre etudie dans ce rapport utilise comme signal d'entree une mesure de puissance en echelle logarithmique, contrairement aux reactimetres developpes jusqu'a present qui utilisent des signaux en echelle lineaire, ce qui limite leur emploi aux mesures physiques du reacteur ou a quelques applications particulieres. L'objectif de ce nouveau reactimetre est d'etre installe dans les tableaux de controle des nouveaux reacteurs pour en simplifier la conduite et leur assurer une meilleure protection. On montre dans cette etude qu'il est possible d'utiliser un signal logarithmique a l'entree sans exiger de circuits compliques et sans commutation, en disposant d'une dynamique de controle de 8 decades, en technologie analogique ou numerique. La precision, un peu moins bonne que celle d'un reactimetre conventionnel, reste cependant tout-a-fait acceptable. Des essais en laboratoire et sur reacteur ont confirme la validite de cette solution et la qualite des mesuresOriginal Title
Reactimetre logarithmique pour la conduite et la protection des reacteurs
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Dec 1981; 64 p
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AbstractAbstract
No abstract available
Original Title
Reactimetre de mesure, de conduite et de securite des reacteurs
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Journal Article
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Bull. Inf. Sci. Tech. (Paris); (no.195); p. 25-28
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No abstract available
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American Nuclear Society 1975 winter meeting; San Francisco, CA, USA; 16 Nov 1975; Published in Summary Form Only.
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Journal Article
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Transactions of the American Nuclear Society; v. 22 p. 558-559
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Gauthier, J.C.
CEA Centre d'Etudes Nucleaires de Cadarache, 13 - Saint-Paul-les-Durance (France). Dept. des Reacteurs a Neutrons Rapides1980
CEA Centre d'Etudes Nucleaires de Cadarache, 13 - Saint-Paul-les-Durance (France). Dept. des Reacteurs a Neutrons Rapides1980
AbstractAbstract
[en] The principle of the reactivity balance meter built at Phenix is presented and the results obtained in feed-back effect measurements are discussed
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Sep 1980; 10 p; Nippon European American core reactor physics annual meeting; Idaho Falls, ID, USA; 22 - 24 Sep 1980
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No abstract available
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Annual meeting of the American Nuclear Society; Philadelphia, PA; 23 Jun 1974; Published in summary form only.
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Trans. Amer. Nucl. Soc; v. 18 p. 343-344
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AbstractAbstract
[en] Three methods for measuring the reactivity of a system in sub-critical state in the presence of a neutron source are described, namely the method of ''shooting source'', the method of dumping of unknown absorber, and the method of introducing the calibrated absorber. The described methods do not require additional equipment, except for an analogue reactometer with a possibility of adjusting the source component in the computing block. The methods are universal since they cover not only the critical assemblies but also any high-intensity reactors in sub-critical stage and permit the temperature effect, the poisoning effects, etc. to be measured. Besides that, the methods may be applied both in the absence and in the presence of a strong neutron background in the reactor
Original Title
Kontrol' reaktivnosti gluboko podkriticheskikh reaktorov s pomoshch'yu reaktimetrov i korrektirovka analoga istochnika
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5 refs.; for English translation see the journal Sov. At. Energy.
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Journal Article
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Atomnaya Ehnergiya; v. 41(4); p. 238-241
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[en] The method of modified-source-multiplication (MSM) for following the subcriticality of a fast power reactor has been tested in measurements of reactivity changes in a conventional assembly built in Zebra as part of the BIZET programme. Correction factors for the departure of detector responses from the point-model approximation were obtained and good agreement was found for the results from detectors in various positions in the assembly. Detectors outside the core performed as well as those in the core. Measurements for a few configurations using a pulsed source technique were found to be in satisfactory agreement with those from MSM. The influence of source changes on the MSM method was studied by the introduction of a strong 252Cf source. The results showed that changes in subcritical flux levels and distributions were well predicted. (UK)
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UKAEA Atomic Energy Establishment, Winfrith; p. 37-52; Apr 1979; p. 37-52; International symposium on fast reactor physics; Aix-en-Provence, France; 24 - 28 Sep 1979
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[en] Published in summary form only
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Anon.; Atominstitut der Oesterreichischen Universitaeten, Vienna; 47 p; 1988; p. 10; 10th European TRIGA users conference; Vienna (Austria); 14-16 Sep 1988
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Miscellaneous
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Baranyai, A.; Zsido, J.
Hungarian Academy of Sciences, Budapest. Central Research Inst. for Physics1983
Hungarian Academy of Sciences, Budapest. Central Research Inst. for Physics1983
AbstractAbstract
[en] The accuracy of reactivity meters is usually checked with a reactor kinetic simulator operating to an accuracy exceeding the expected accuracy of the measuring device. The present report describes a method to evaluate accuracy by comparing the response R(t) of the reactivity meter to a given function n(t) with the value of the reactivity function r(t) calculated from the same input function instead of using the input reference signal r(t) to the simulator with the output signal R(t) from the reactivity meter. This method has been successfully used by applying sawtooth and exponential input signals for the determination of the accuracy of reactivity meters developed in the Central Research Institute for Physics. (author)
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Feb 1983; 10 p; ISBN 963 372 040 0;
; 8 refs.

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AbstractAbstract
No abstract available
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American Nuclear Society 1975 winter meeting; San Francisco, CA, USA; 16 Nov 1975; Published in Summary Form Only.
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Journal Article
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Transactions of the American Nuclear Society; v. 22 p. 555-556
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