A NEW SOLUTION APPROACH FOR THE NONLINEAR DYNAMIC MODEL OF MOLTEN SALT REACTORS

Year 2019, Volume: 31 Issue: 2, 93 - 104, 31.12.2019

Hüseyin Ayhan

Abstract

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 is very important for the reactor control. In this study, a new reactor dynamics model is proposed to determine these important 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 obtained in addition to a MATLAB-Simulink model.

Keywords

Molten Salt Reactor (MSR), Reactor dynamics, Point kinetics

References

• Y. Shimazu, “Nuclear Safety Analysis of a Molten Salt Breeder Reactor,” J. Nucl. Sci. Technol., vol. 522, no. July, pp. 514–522, 1978.
• B. M. El-Sheikh, “Kinetic Analysis of Molten Salt Reactors,” Arab J. Nucl. Sci. Appl., vol. 50, no. 4, pp. 201–212, 2017.
• A. Cammi and V. Di Marcello, “Transfer Function Modeling of Zero-Power Dynamics of Circulating Fuel Reactors,” J. Eng. Gas Turbines Power, vol. 133, pp. 1–8, 2011.
• M. Zarei, “A refined time-delay modeling of the molten salt reactor dynamics,” Prog. Nucl. Energy, vol. 117, p. 103102, 2019.
• V. Singh et al., “Dynamic Modeling and Performance Analysis of a Two-Fluid Molten Salt Breeder Reactor System,” Nucl. Technol., pp. 1–24, 2018.
• D. Zhang, S. Qiu, and G. Su, “Development of a safety analysis code for molten salt reactors,” Nucl. Eng. Des., vol. 239, pp. 2778–2785, 2009.
• J. Serp et al., “The molten salt reactor (MSR) in Generation IV: Overview and perspectives,” Prog. Nucl. Energy, vol. 77, pp. 308–319, 2014.
• A. Cammi, V. Di Marcello, L. Luzzi, V. Memoli, and M. E. Ricotti, “A multi-physics modelling approach to the dynamics of Molten Salt Reactors,” Ann. Nucl. Energy, vol. 38, no. 6, pp. 1356–1372, 2011.
• MATLAB-Simulink User’s Guide R2019b. The MathWorks Inc., 2019.
• E. Merle-Lucotte et al., “Preliminary Design Assessment of the Molten Salt Fast Reactor,” in ECN-2012: Transactions Advanced Reactors, 2012, pp. 17–26.
• M. Aufiero et al., “Development of an OpenFOAM model for the Molten Salt Fast Reactor transient analysis, 2019.,” Chem. Eng. Sci., vol. 111, pp. 390–401, 2014.
• C. Fiorina et al., “Modelling and analysis of the MSFR transient behaviour,” Ann. Nucl. Energy, vol. 64, pp. 485–498, 2014.
• F. Di Lecce, “Neutronic and thermal-hydraulic simulations for Molten Salt Fast Reactor safety assessment,” Politecnico Di Torino, 2018.
• U. Köse, U. Koç, L. B. Erbay, E. Öğüt, and H. Ayhan, “Heat exchanger design studies for Molten Salt Fast Reactor,” EPJ Nucl. Sci. Technol., 2019.