NUMERICAL INVESTIGATION OF MOLTEN SALT SCATTERING UNDER AN INTERNAL TNT EXPLOSION SCENARIO IN A MICRO MOLTEN SALT REACTOR

H.T. Kim; S.I. Kim; S.M. Chang

doi:10.6112/kscfe.2026.31.2.058

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Original Article

NUMERICAL INVESTIGATION OF MOLTEN SALT SCATTERING UNDER AN INTERNAL TNT EXPLOSION SCENARIO IN A MICRO MOLTEN SALT REACTOR 초소형 용융염 원자로의 폭발 시나리오에서 용융염 완화입자의 비산 수치 해석

30 June 2026. pp. 58-72

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Abstract

This study numerically investigates molten salt dispersion induced by an internal TNT explosion in a truck-mounted micro molten salt reactor (MSR). An ALE-SPH coupled framework implemented in LS-DYNA was used to simulate blast wave propagation and the initial acceleration of molten salt for TNT charges up to 200 kg. The blast model was validated against the Sedov-Taylor similarity solution, demonstrating accurate self-similar scaling of shock radius and pressure decay. To enhance computational efficiency in predicting long-range transport, a hybrid strategy was adopted: the blast-dominated phase was resolved in LS-DYNA, while the subsequent ballistic phase was calculated using a Python-based solver incorporating gravity, aerodynamic drag, and wind effects. The results indicate that wind significantly increases the maximum scattering distance and modifies the spatial mass distribution; for the 200 kg TNT case at a 45° penetration angle, the maximum distance increased from 899 m under no-wind conditions to 982 m with a 5 m/s wind.

Keywords

Molten Salt Reactor, MSR

SPH

Sedov similarity theory

Blast modeling

Scattering distance

키워드

용융염 원자로

완화 입자

Sedov 상사 이론

폭발 모델링

비산 거리

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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 :58-72
Received Date : 2026-02-25
Revised Date : 2026-06-08
Accepted Date : 2026-06-12
DOI :https://doi.org/10.6112/kscfe.2026.31.2.058

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

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