Authors & Affiliations
Ashraf O.1,2, Tikhomirov G.V.1
1 Institute of Nuclear Physics and Engineering, National Research Nuclear University MEPhI, Moscow, Russia
2 Department of Physics, Faculty of Education, Ain Shams University, Cairo, Egypt
Nikanorov O.L. – Head of Group, Cand. Sci. (Techn.).
Salyaev A.V. – Head of Group.
Kirilov I.N. – Design Engineer, category 2.
Kuznetsov D.V. – Design Engineer, category 2.
The current work introduces a reliable safety system based on control rods in addition to the online feed system reactivity control in the Single-fluid Double-zone Thorium-based Molten Salt Reactor
(SD-TMSR). The reactivity of the SD-TMSR core is controlled through two systems of control assemblies: (1) the control safety devices (CSD) and (2) the diverse safety devices (DSD). In the present work, the control rods are natural B4C and B4C-90 (with 90% weight content of the main absorbing 10B isotope). Since the numbers and distribution of control assemblies in SD-TMSR have not been studied previously, we proposed a unique distribution as a starting point for this analysis. The distribution of these 25 fuel assemblies with control rods in the SD-TMSR core and their numbering scheme were presented in this paper. Additionally, excess reactivity, control rod worth, and shutdown margin were calculated using Monte Carlo code Serpent2. Analysis results showed that the proposed placement of the control rods will make it possible to compensate for excess reactivity during fuel burnout and emergency shutdown of the reactor.
molten salt reactor, SD-TMSR, safety, excess reactivity, control rod worth, shutdown margin
Ashraf O., Rykhlevskii A., Tikhomirov G.V., Huff K.D. Whole core analysis of the single-fluid double-zone thorium molten salt reactor (SD-TMSR). Annals of Nuclear Energy, 2020, vol. 137, pp. 107115.
Zhuang K., Cao L. Numerical analysis on the dynamic behaviors of a graphite-moderated molten salt reactor based on MOREL2.0 code. Annals of Nuclear Energy, 2018, vol. 117, pp. 3–11.
Girardin G., Rimpault G., Coddington P., Chawla R. Control rod shadowing and anti-shadowing effects in a large gas-cooled fast reactor. Proc. of the Int. Congr. Adv. Nucl. Power Plants – ICAPP 2007, The Nucl. Renaiss. Work. 2007, vol. 3, pp. 1858–1865.
Pioro I.L. Handbook of Generation IV Nuclear Reactors. Sawston, Cambridge “Woodhead Publishing”, 2016. Pp. 152–180.
Ashraf O., Rykhlevskii A., Tikhomirov G.V., Huff K.D. Strategies for thorium fuel cycle transition in the SD-TMSR. Annals of Nuclear Energy, 2020, vol. 148, pp. 107656.
Rykhlevskii A., Bae J.W., Huff K.D. Modeling and simulation of online reprocessing in the thorium-fueled molten salt breeder reactor. Annals of Nuclear Energy, 2019, vol. 128, pp. 366–379.
Li G.C. et al. Optimization of Th-U fuel breeding based on a single-fluid double-zone thorium molten salt reactor. Progress of Nuclear Energy, 2018, vol. 108, pp.144–151.
Ashraf O., Smirnov A.D., Tikhomirov G.V. Nuclear fuel optimization for molten salt fast reactor. Journal of Physics: Conference Series, 2018, vol. 1133, pp. 012026.
Ashraf O., Smirnov A.D., Tikhomirov G.V. Modeling and criticality calculation of the Molten Salt Fast Reactor using Serpent code. Journal of Physics: Conference Series, 2019, vol. 1189, pp. 012007.
Ashraf O., Tikhomirov G.V. Preliminary study on the online reprocessing and refueling scheme for
SD-TMS reactor. Journal of Physics: Conference Series, 2019, vol. 1439, pp. 012005.
Ashraf O., Tikhomirov G.V. Thermal-and fast-spectrum molten salt reactors for minor actinides transmutation. Annals of Nuclear Energy, 2020, vol. 148, pp. 107751.
Leppanen J., Pusa M., Viitanen T., Valtavirta V., Kaltiaisenaho T. The Serpent Monte Carlo code: Status, development and applications in 2013. Annals of Nuclear Energy, 2015, vol. 82, pp.142–150.