Advancements in PARCS/TRACE Coupling and Simulation of Rod Ejection Accident in VVER-1000 Nuclear Reactor

Gianluca Nesti, Guido Mazzini (), Antonio Dambrosio and Matteo D’Onorio
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Gianluca Nesti: Department of Astronautical, Electrical and Energy Engineering (DIAEE)—Nuclear Section, Sapienza University of Rome, C.so Vittorio Emanuele II 244, 00186 Rome, Italy
Guido Mazzini: SURO—National Radiation Protection Institute, Prague, Bartoškova 28, 140 00 Praha, Czech Republic
Antonio Dambrosio: CVR—Research Center Řež, 130, Řež, 250 68 Husinec, Czech Republic
Matteo D’Onorio: Department of Astronautical, Electrical and Energy Engineering (DIAEE)—Nuclear Section, Sapienza University of Rome, C.so Vittorio Emanuele II 244, 00186 Rome, Italy

Energies, 2025, vol. 18, issue 20, 1-18

Abstract: As the global energy demand continues to grow and the pursuit of clean and sustainable resources intensifies, nuclear energy stands out as a secure, reliable, and low-emission solution. The complexity of nuclear power plant behavior under various operating conditions necessitates advanced simulation tools capable of capturing the interplay between multiple physical phenomena. Among these, multi-physics coupling, particularly between neutronics and thermal hydraulics, is a well-established approach for accurately modeling transient scenarios with strong feedback effects. In this context, PARCS and TRACE codes, developed by the U.S. Nuclear Regulatory Commission, are widely used for coupled neutronic/thermal-hydraulic analyses and can be operated via the SNAP graphical interface. However, the current version of SNAP does not support automatic coupling for hexagonal core geometries, such as those found in VVER-type reactors. To address this limitation, a dedicated tool was developed to facilitate the coupling process between PARCS and TRACE for hexagonal cores. The proposed methodology was tested through the simulation of a rod ejection accident in a VVER-1000 reactor, demonstrating the validity of the methodology and confirming that the multi-physics approach provides more accurate, best-estimate results.

Keywords: multi-physics; coupling; PARCS; TRACE; VVER-1000; safety (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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