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Feynman-alpha and Rossi-alpha formulas with spatial and modal effects
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. 590-600Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Feynman-alpha and Rossi-alpha formulas including multiple alpha-modes are derived for stochastic and continuous neutron sources. The presented formalism is further developed to achieve spatial correction factors for the single alpha-mode point kinetics representations of the Feynman-alpha and Rossi-alpha formulas. As a natural extension of the multiple alpha-mode formalism, delayed neutrons are included in the Feynman-alpha formula. The obtained formulas are validated experimentally in a strongly heterogeneous system obeying multiple alpha-modes, resulting in good agreement with the presented theoretical framework.

Ort, förlag, år, upplaga, sidor
2011. Vol. 38, nr 2-3, s. 590-600
Nyckelord [en]
Feynman-alpha, Rossi-alpha, Stochastic transport theory, Reactivity determination
Nationell ämneskategori
Subatomär fysik
Identifikatorer
URN: urn:nbn:se:kth:diva-13586DOI: 10.1016/j.anucene.2010.09.027ISI: 000287571100047Scopus ID: 2-s2.0-78751608739OAI: oai:DiVA.org:kth-13586DiVA, id: diva2:326036
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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Berglöf, Carl
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Totalt: 313 träffar
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