SPREADING ANALYSIS OF SPILL SALT IN MSR USING ANSYS FLUENT

R.J. Park; S.M. An; H.T. Kim; S. Kim

doi:10.6112/kscfe.2026.31.2.073

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Original Article

SPREADING ANALYSIS OF SPILL SALT IN MSR USING ANSYS FLUENT ANSYS Fluent를 이용한 용융염 원자로의 누출 용융염 퍼짐 해석

30 June 2026. pp. 73-83

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Abstract

As a part of small reactor developments for the GEN-IV (Generation IV) reactors, a MSR (Molten Salt Reactor) is selected for reactor technology and safety aspects worldwide. In a safety of the MSR, the most important thing is a loss of the molten fuel salt in the primary system. The spreading and heat transfer behavior of radionuclide-bearing molten salt directly and indirectly affect the distribution of radionuclides during and after a salt spill accident. For this reason, the spreading and cooling process of the spill molten salt is very important for MSR safety. Analysis on spreading distance of the spill molten salt as salt composition of KCl-NaCl-UCl₃ for marine MSR or KCl-UCl₃ for very small MSR has been performed using the ANSYS-Fluent computer code. In addition, effect of mass increase on spreading distance has been analyzed in spill molten salt accident. As the temperature of the leaked molten salt decreases due to heat transfer to the surroundings and reaches its solidification temperature, the liquid molten salt solidifies. It can be seen that KCl-NaCl- UCl₃ with a solidification temperature of 724 K spreads more than KCl-UCl₃ with a solidification temperature of 809 K. It can be seen that an increase in the flow rate of the leaking molten salt leads to increase in the spreading distance, but the increase is not proportional. The spreading distance is longer when a larger amount of the same mass leaks initially.

Keywords

Molten Salt Reactor, MSR

Spill molten salt

Spreading distance

Solidification

Temperature distribution

키워드

용융염 원자로

용융염 누출

퍼짐 거리

고화

온도 분포

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Information

Publisher :Korean Society for Computational Fluids Engineering
Publisher(Ko) :한국전산유체공학회
Journal Title :Journal of Computational Fluids Engineering
Journal Title(Ko) :한국전산유체공학회지
Volume : 31
No :2
Pages :73-83
Received Date : 2026-03-04
Revised Date : 2026-06-01
Accepted Date : 2026-06-15
DOI :https://doi.org/10.6112/kscfe.2026.31.2.073

Journal of Computational Fluids Engineering ISSN:1598-6071(Print) 3022-6252(Online) 한국전산유체공학회지

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