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Auto-correlation and variance-to-mean measurements in a subcritical core obeying multiple alpha-modes
KTH, Skolan för teknikvetenskap (SCI), Fysik, Reaktorfysik.
Visa övriga samt affilieringar
2011 (Engelska)Ingår i: Annals of Nuclear Energy, ISSN 0306-4549, E-ISSN 1873-2100, Vol. 38, nr 2-3, s. 194-202Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Neutron noise measurements based on the Rossi-alpha and Feynman-alpha methodologies have been performed in a heterogeneous subcritical system. It is shown that the traditional single alpha-mode formulations of the Rossi-alpha and Feynman-alpha methods are not applicable due to the presence of higher alpha-modes. Formalisms taking into account multiple alpha-modes are applied resulting in satisfactory results. Three alpha-modes could be identified using the Rossi-alpha method, whereas only two could be obtained using the Feynman-alpha method. In the Feynman-alpha case, the possibility to obtain the fastest decaying alpha-mode was diminished due to detector dead time effects. It was found that the slowest decaying alpha-mode does not exactly correspond to the prompt decay found in pulsed neutron source measurements, which confirms the results of previous studies. Strengths and weaknesses of the multiple alpha-mode Rossi-alpha and Feynman-alpha methods observed in this study are pointed out.

Ort, förlag, år, upplaga, sidor
2011. Vol. 38, nr 2-3, s. 194-202
Nyckelord [en]
Neutron noise experiment, Auto-correlation, Rossi-alpha, Variance-to-mean, Feynman-alpha, Reactivity determination
Nationell ämneskategori
Subatomär fysik
Identifikatorer
URN: urn:nbn:se:kth:diva-13583DOI: 10.1016/j.anucene.2010.11.009ISI: 000287571100004Scopus ID: 2-s2.0-78751615182OAI: oai:DiVA.org:kth-13583DiVA, id: diva2:326029
Anmärkning
QC 20100621 Uppdaterad från submitted till published (20110315).Tillgänglig från: 2010-06-21 Skapad: 2010-06-21 Senast uppdaterad: 2017-12-12Bibliografiskt granskad
Ingår i avhandling
1. On measurement and monitoring of reactivity in subcritical reactor systems
Öppna denna publikation i ny flik eller fönster >>On measurement and monitoring of reactivity in subcritical reactor systems
2010 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Accelerator-driven systems have been proposed for incineration of transuranic elements from spent nuclear fuel. For safe operation of such facilities, a robust method for reactivity monitoring is required. Experience has shown that the performance of reactivity measurement methods in terms of accuracy and applicability is highly system dependent. Further investigations are needed to increase the knowledge data bank before applying the methods to an industrial facility and to achieve license to operate such a facility. In this thesis, two systems have been subject to investigation of various reactivity measurement methods. Conditions for successful utilization of the methods are presented, based on the experimental experience. In contrast to previous studies in this field, the reactivity has not only been determined, but also monitored based on the so called beam trip methodology which is applicable also to non-zero power systems. The results of this work constitute a part of the knowledge base for the definition of a validated online reactivity monitoring methodology for facilities currently being under development in Europe (XT-ADS and EFIT).

Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2010. s. 72
Serie
Trita-FYS, ISSN 0280-316X ; 2010:18
Nyckelord
reactor, ADS, accelerator-driven systems, subcriticality determination, noise techniques, pulsed neutron source, reactivity monitoring
Nationell ämneskategori
Subatomär fysik
Identifikatorer
urn:nbn:se:kth:diva-12483 (URN)978-91-7415-623-2 (ISBN)
Disputation
2010-05-12, FA32, Albanova University Center, Roslagstullsbacken 21, Stockholm, 14:00 (Engelska)
Opponent
Handledare
Anmärkning
QC 20100621Tillgänglig från: 2010-05-06 Skapad: 2010-04-29 Senast uppdaterad: 2011-06-09Bibliografiskt granskad

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