Rindi Wulandari(1), Sutanto Sutanto(2), Asril Pramutadi Andi Mustari(3),

(1) Polytechnic Institute of Nuclear Technology, National Nuclear Energy Agency
(2) Polytechnic Institute of Nuclear Technology, National Nuclear Energy Agency
(3) Faculty of Mathematics and Nature Science, Bandung Institute of Technology
Corresponding Author


INTERACTION OF MOLTEN URANIUM WITH ELECTRICAL PENETRATING TUBE OF A BOILING WATER REACTOR DURING SEVERE ACCIDENT. Fukushima accident was the first severe accident of a BWR type which the core was melted leading to RPV failure at the bottom head. Regarding its complex structures of the bottom head, the scheme of failure is different from that of previous reactor severe accidents that ever happened (i.e. TMI-2 and Chernobyl accidents). There is a lot of penetration tubes through the bottom head leading to a complex interaction between corium and the structures. Eutectic reaction is possible to happen due to high temperature leading to a rapid failure of the RPV. Therefore, it is important to understand the phenomenon of interaction between corium and the structures. In this study, an interaction between molten uranium and structure of electrical tube, one of the penetration tubes, was analyzed by using MPS-LER method. Fluid dynamics of the MPS-LER simulation was validated by experiments of fluid flow by using water and oil.Calculation results of the fluid flow showed a good agreement with that of experiments.The MPS-LER was applied to calculate the penetration rate of molten uranium which flowed through the wall of the electrical tube at the bottom head of a BWR. The penetration rate was high due to eutectic reaction. The rate achieved 555.56 µm/s. Conservatively, it took less than 1 minute of time for the molten uranium to melt the tube wall with a thickness of 1.232 cm.


Molten uranium; electrical tube; penetration rate


[1] T.G. Theofanous , “The cooldown aspects of the TMI-2 accident”, J. Nucl. Eng. Design, Vol. 105, p. 373-391, 1988.

[2] E.L. Tolman, P. Kuan, J.M. Brouhton, “TMI-2 accident scenario update”, J. Nucl. Eng. Design, Vol. 108, p. 45-54, 1988.

[3] B.R. Seghal, “Nuclear safety in Light Water Reactors: Severe accident phenomenology”, Academic press, Amstermdam, The Netherlands, 2012.

[4] The US. Nuclear Regulatory Commision (NRC), “R-800-Perspective in nuclear safety course”, NU REG/CR-6042 Rev. 2, 2012.

[5] S. Koshizuka, Y. Oka, “Moving-Particle Semi-implicit method for fragmentation of incompressible fluid”, J. Nucl. Sci. and Eng. Vol. 123, p. 421-434, 1996.

[6] Y.U. Kuznetsova, S.V. Rempel, I.D. Popov, E.Y. Gerasimov, A.A. Rempel, “Stabilization of Ag2S nanoparticles in aqueous solution by MPS”, J. Colloids ans Surfaces A: Physiccochem. Eng. Aspects, Vol. 520, p. 369-377, 2017.

[7] R. Chen, Y. Oka, G. Li, T. Matsuura, “Numerical investigation on melt freezing behavior in a tube by MPS method”, J. Nucl. Eng. And Design, Vol. 273, p. 440-448, 2014.

[8] G. Li, Y. Oka, M. Furuya, “Experimental and numerical study of stratification and solidification/melting behaviors”, J. Nuc. Eng. and Design, Vol. 272, p. 109-117, 2014.

[9] A.P. Andi Mustari, Y. Oka, “Molten uranium eutectic interaction on iron-alloy by MPS method, J. Nucl. Eng. and Design”, Vol. 278, p. 387-394, 2014.

[10] A.P. Andi Mustari, Y. Oka, M. Furuya, W. Takeo, R. Chen, “3D simulation of eutectic interaction of Pb–Sn system using MovingParticle Semi-implicit (MPS) method”, J. An. of Nucl. Energy, Vol. 81, p. 26-33, 2015.

[11] A.P. Andi Mustari, A. Yamaji, D. Irwanto, “Melting Penetration Simulation of Fe-U System at HighTemperature Using MPS_LER”, J. Of Physics: Conference Series Vol. 739, 2016.

[12] A.P. Andi Mustari, Iksal, Sumiati, Syeilendra, D. Irwanto, N.A. Aprianti, “Prediction of Melting Penetration of Armco Iron by Liquid Uranium Using MPS_LER”, J. Of Physics: Conference Series, Vol 799, 2017.

[13] R. Chen, L. Chen, K. Guo, A. Yamaji, M. Furuya, W. Tian, G.H. Su, S. Qiu, “Numerical analysis of the melt behavior in a fuel support piece of the BWR by MPS”, J. Annals of Nucl. Energy, Vol. 102, p.422-439, 2017.

[14] G. Li, P. Wen, H. Feng, J. Zhang, J. Yan, “Study on melt stratification and migration in debris bed using the moving semi-implicit method”, J. Nucl. Eng. and Design, Vol. 360, p. 110459, 2020.

[15] D. Wang, Y. Zhang, R. Chen, G.H. Su, S. Qiu, W. Tian, “Numerical simulation of zircaloy-water reaction based on the moving particle semi-implicit method and combined analysis with the MIDAC code for the nuclear-reactor core melting process”, J. Progress in Nucl. Energy, Vol. 118, p. 103083, 2020.

[16] Z. Xiong, S. Cheng, R. Xu, Y. Tan, H. Zhang, Y. Xu, “Experimental study on eutectic reaction between fuel debris and reactor structure using simulant materials”, J. Annals of Nucl. Energy, Vol. 139, p. 107284, 2020.

[17] S.A. Hodge, L.J. Ott, “BWR lower plenum debris bed models for MELCOR”, Conference, Oak Ridge National Laboratory, 1992.

Full Text: PDF (Bahasa Indonesia)

DOI: 10.17146/gnd.2020.23.2.5816

Copyright (c) 2020

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.