Department of Reactor Safety
Research
Neutron physics and reactor dynamics
Plant dynamics and severe accident analysis
Monte-Carlo simulations (n- / γ-field calculations)
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Latest publication
Analysis of loss of flow without scram test in the FFTF reactor: Coupled 3D neutronics and thermal hydraulics analysis with DYN3D/ATHLET code system
Nikitin, E.; Ponomarev, A.; Fridman, E.
Abstract
The coupled code system DYN3D/ATHLET is continuously developed and validated for transient analyses of sodium-cooled fast reactors (SFRs). In this study, the system was applied to model the loss of flow without scram (LOFWOS) test conducted at the Fast Flux Test Facility (FFTF), with the aim of further assessing the coupled 3D neutronics and system-level thermal hydraulics analysis capabilities. Two simulation approaches were employed. The first approach utilized the point kinetics module of ATHLET for neutron physics. The second relied on the 3D spatial kinetics solver of DYN3D. In both cases, the thermal hydraulics of the system was handled by ATHLET, while neutronics data was generated by the Serpent Monte Carlo code. The performance of both approaches was evaluated by comparing their results with experimental data. Additionally, the feasibility of using the adaptive decay heat model, a recent enhancement in DYN3D, was demonstrated. This paper concludes the FFTF LOFWOS study, extending the validation base for the DYN3D/ATHLET system in comprehensive SFR modeling.
Keywords: SFR; Serpent; DYN3D; ATHLET; coupled calculations; point kinetics; spatial kinetics; decay heat
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Nuclear Engineering and Design 433(2025), 113833
DOI: 10.1016/j.nucengdes.2025.113833
Permalink: https://www.hzdr.de/publications/Publ-37347
Team
Head | |||||
Name | Bld./Office | +49 351 260 | |||
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Dr. Sören Kliem | 250/108 | 2318 | s.kliem![]() | ||
Employees | |||||
Name | Bld./Office | +49 351 260 | |||
Dr. Yurii Bilodid | 250/209 | 2020 | y.bilodid![]() | ||
Dr. Emil Fridman | 250/209 | 2167 | e.fridman![]() | ||
Jörg Konheiser | 250/109 | 2416 | j.konheiser![]() | ||
Kerstin Kurde | 250/107 | 3025 | k.kurde![]() | ||
Dr. Evgeny Nikitin | 250/207 | 2906 | e.nikitin![]() | ||
Dr. Frank Schäfer | 250/117 | 2069 | f.schaefer![]() |