Acknowledgement
The simulations presented in this paper were performed at the Swierk Computing Centre in the Department of Complex Systems at the National Centre for Nuclear Research, Poland. This work is part of the studies in the strategic Polish program of scientific research and development work "Social and economic development of Poland in the conditions of globalizing markets GOSPOSTRATEG", part of "Preparation of legal, organizational and technical instruments for the HTR implementation" financed by the National Centre for Research and Development (NCBiR) in Poland. M.J. is a recipient of scholarships within the framework of the project New Reactor Concepts and Safety Analyses for the Polish Nuclear Energy Program (POWR.03.02.00-00- I005/17) implemented under the Operational Programme Knowledge Education Development 2014-2020 co-financed by the European Social Fund.
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