A new solution approach for the nonlinear dynamic model of molten salt reactors
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Date
2019-12
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Turkish Atomic Energy Authority
Abstract
Erimiş Tuz Reaktörlerinin reaktör dinamik modellemesi, birinci çevrimde dolaşmakta
olan sıvı yakıt nedeniyle çok önemlidir. Çekirdekte üretilen gecikmiş nötronlar kritiklik
açısından düşük önemdeki bölgelerde ve hatta kor dışında bozulabilir. Bu nedenle, ani ve
gecikmiş nötronlar ile reaktivite geri besleme miktarının belirlenmesi reaktör kontrolü
açısından oldukça önemlidir. Bu çalışmada, bu kritik parametreler ile diğer reaktör
parametrelerini ve sistemin zamana bağlı davranışını belirlemek için yeni bir reaktör dinamiği
modeli önerilmiştir. Termal-hidrolik model, literatürde bulunanlardan farklı olarak
oluşturulmuştur. Doğrusal olmayan formdaki nokta kinetik denklemler doğrusallaştırılmış ve
durum-uzay formunda ifade edilmiştir. Ergimiş tuz reaktörlerinin lineer olmayan dinamik
modeli için yeni bir yaklaşım ve MATLAB-Simulink modeli elde edilmiştir.
The reactor dynamic modeling of the Molten Salt Reactors is very important due to the circulating liquid fuel in the primary loop. The delayed neutron precursors generated in the core may decay in locations of low importance for criticality and even out of the core. Therefore, determining the amount of the prompt and delayed neutrons, and reactivity feedback are very important for the reactor control. In this study, a new reactor dynamics model is proposed to determine these crucial parameters along with other reactor parameters and transient behavior of the system. The thermal-hydraulic model is adopted differently from the ones available in literature. Point kinetic equations in nonlinear form are linearized and derived in state-space form. A new solution approach for the nonlinear dynamic model of molten salt reactors was achieved in addition to a MATLAB-Simulink model.
The reactor dynamic modeling of the Molten Salt Reactors is very important due to the circulating liquid fuel in the primary loop. The delayed neutron precursors generated in the core may decay in locations of low importance for criticality and even out of the core. Therefore, determining the amount of the prompt and delayed neutrons, and reactivity feedback are very important for the reactor control. In this study, a new reactor dynamics model is proposed to determine these crucial parameters along with other reactor parameters and transient behavior of the system. The thermal-hydraulic model is adopted differently from the ones available in literature. Point kinetic equations in nonlinear form are linearized and derived in state-space form. A new solution approach for the nonlinear dynamic model of molten salt reactors was achieved in addition to a MATLAB-Simulink model.
Description
Keywords
Molten Salt Reactor (MSR), Ergimiş Tuz Reaktörü (ETR), Reactor dynamics, Reaktör dinamiği, Point kinetics, Nokta kinetik, State-space form, Durum-uzay formu, Linearization, Lineerleştirme
Citation
Yeşil, S. (2019). Evacuation planning and evacuation time estimate analyses methods for nuclear power plants. Turkish Journal of Nuclear Sciences, 31(2), 80-92.