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Full-resolution model reproduces key MSRE flow and neutron data

Interior of a submarine or vessel control room with multiple analog clock instruments, gauges, monitoring displays, control panels, metal fixtures, and equipment mounted on gray walls, with two cushioned seats visible in the cramped space.
Research area:Nuclear engineeringNuclear reactor physics and engineeringMonte Carlo method

What the study found

A full-resolution multiphysics model of the Molten Salt Reactor Experiment (MSRE, a Molten Salt Reactor Experiment from the 1960s) matched key benchmark data and reproduced major experimental flow trends. The model also revealed three-dimensional flow structures that simplified axisymmetric models did not capture.

Why the authors say this matters

The authors say the model can help infer missing design data from experiments where parameters are uncertain. They also state that high-fidelity simulation may support reactor start-up procedures and digital-twin applications, and that resolving geometric detail is important for MSR design and analysis.

What the researchers tested

The researchers built a full-resolution model of the entire reactor vessel and internal structures without porous-media or axisymmetric approximations. They coupled Monte Carlo neutron–photon transport (Serpent 2, a simulation code for particle transport) with conjugate heat transfer and turbulent flow simulation (GeN-Foam within the foamForNuclear platform) on unstructured meshes, and iterated the model to convergence with temperature and density feedback.

What worked and what didn't

Predicted effective multiplication factor and power fractions showed good agreement with benchmark data. Velocity profiles in the volute, annulus, and core passages were compatible with experimental measurements and previous simulations within known uncertainties in geometry and operating conditions. Some discrepancies remained, largely because of input uncertainties and limits of Reynolds-averaged Navier–Stokes (RANS, a turbulence modeling approach) under strong adverse pressure gradients; the authors suggest future extensions to large-eddy simulation (LES, a more detailed turbulence approach).

What to keep in mind

The abstract notes that some inputs were uncertain, including geometry and operating conditions. It also states that the remaining discrepancies are tied to those uncertainties and to RANS limitations, but it does not provide a full list of limitations beyond this.

Key points

  • The model matched key benchmark data for effective multiplication factor and power fractions.
  • It reproduced major experimental flow trends in the lower plenum and revealed three-dimensional structures missed by axisymmetric models.
  • The study used coupled neutron–photon transport and heat-transfer/flow simulation on unstructured meshes.
  • Some discrepancies remained because of input uncertainties and limits of RANS turbulence modeling.
  • The authors say the model may support reactor start-up procedures and digital-twin applications.

Disclosure

Research title:
Full-resolution model reproduces key MSRE flow and neutron data
Authors:
Rok Krpan, Cole Gentry, Jean C. Ragusa, Kevin Clarno, Carlo Fiorina
Institutions:
Texas A&M University, The University of Texas at Austin
Publication date:
2026-04-06
DOI:
10.1016/j.anucene.2026.112314
OpenAlex record:
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AI provenance: This post was generated by OpenAI. The original authors did not write or review this post.

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