TAG 2.1 Thermal hydraulics and severe accidents

ALISA – Analytical and experimental investigation of severe accident phenomena, VTT

Research reports: 

Sevón, T. 2023. Modelling steel oxidation in steam with MELCOR. VTT Research Report, VTT-R-00689-23. 29 p.

Pasi, A-E. 2023. Release of VOCs from painted surfaces. VTT Research Report, VTT-R-00840-23, 17 p.

 

CeReSa – CFD for Reactor Safety, VTT

Research reports: 

Kapanen, J. 2025. Modelling of hydrogen deflagration with OpenFOAM XiFluid solver. VTT Research Report, VTT-R-00113-25. 24 p.

Rämä, T. 2025. Simulation of a selected PNL experiment. Fortum report. 17 p.

Peltonen, P., Peltola, J., Niemi, T., Hovi, V. 2024. Further calibration of OpenFOAM polydisperse flow models. VTT Research Report, VTT-R-00699-24. 12 p.

Syrjänen, J., Niemi, T., Hovi, V. 2024. Validation of a CFD model for PWR containment analysis. VTT Research Report, VTT-R-00338-24. 38 p.

Peltonen, P., Niemi, T., Hovi, V. 2023. On modelling of turbulent dispersion in polydisperse flows. VTT Research Report, VTT-R-00808-23, 21 p.

Syrjänen, J., Hovi, V. 2023. Validation of a surface condensation model for PWR containment analysis. VTT Research Report, VTT-R-00884-23, 19 p.

Rämä, T. 2023. CeReSa subproject simulations of the selected Conan experiment with ANSYS fluent. Fortum report, 13 p.

 

C-FLOW – Critical Flow Separate-Effect-Test Facility & Experiments, LUT

Research reports: 

Pyy, L., Kotro, E., Karppinen, J., Räsänen, A & Kouhia, V. 2023. General description of CRAFTY – first edition. Technical Report, LUT University, Nuclear Engineering. 28 p. + app. 35 p.

Theses:

Singh, S. 2024. CFD modelling of two-phase critical flow with different length-to-diameter ratio horizontal tubes. Master‘s Thesis, LUT University. 119 p. + app. 4 p. https://urn.fi/URN:NBN:fi-fe2024061753534

Zaitsev, A. 2023. Modelling of two-phase critical flow in steam generator tube guillotine rupture scenario with Apros for the C-FLOW separate-effect-test facility. Master’s thesis, Lappeenranta-Lahti University of Technology LUT. 90 p. https://lutpub.lut.fi/handle/10024/166460

 

ESPO – Analysis of Passive Safety Systems’ Operations and Modelling, VTT

Research reports:

Alblouwy, F. 2025. Analysis of APSARA Test Facility Data with Apros and CATHARE-3 Codes – 2 (Two Phase Cases). VTT Research Report, VTT-R-00028-25. 38 p.

Alblouwy, F. 2024. Analysis of APSARA Test Facility Data with Apros and CATHARE-3 Codes. VTT Research Report, VTT-R-00068-24, 28 p.

 

GRAF – Gravity driven flow experiments, LUT

Conference papers and journal articles:

Riikonen, V., Kouhia, V., Puustinen, M., Patel, G., Räsänen, A., Kotro, E., Hyvärinen, J. 2025. Experimental studies on nitrogen’s effect on reactor core cooling during a hot leg SBLOCA in a scaled EPR model. Nuclear Engineering and Design, Volume 434, April 2025, 113916. https://doi.org/10.1016/j.nucengdes.2025.113916.

Hyvärinen, J., Riikonen, V., Telkkä, J., Hujala, E., Kouhia, V., Puustinen, M., Patel, G., Pyy, L., Vihavainen, J., Suikkanen, H., Rintala, V. 2024. Creating the foundation for safe nuclear power in Finland – Thermal hydraulics, safety analyses, safety justification methods research at the LUT University, 2000-2023. Nuclear Engineering and Design, Volume 419, April 2024. https://doi.org/10.1016/j.nucengdes.2024.112935

Riikonen, V., Telkkä, J., Kouhia, V., Puustinen, M., Giteshkumar, P., Pyy, L., Räsänen, A., Kotro, E., Hyvärinen, J., Murad, A. 2024. Helical coil steam generator stability experiments with the MOTEL test facility. Nuclear Engineering and Design, Volume 429, 1 December 2024, 113566. https://doi.org/10.1016/j.nucengdes.2024.113566

Telkkä, J., Riikonen, V., Kouhia, V., Puustinen, M., Pyy, L., Räsänen, A., Kotro, E., Hyvärinen, J. 2024. Experiments on open loop passive cooling of nuclear reactor containment: Quasi-steady-state heat removal, dynamic loads, and feasibility of practical periodic testing, Nuclear Engineering and Design, Volume 424, August 2024.  https://doi.org/10.1016/j.nucengdes.2024.113317 

Theses:

Toleukaiyr, T. 2023. Modelling of helical coil steam generator of MOTEL facility with Computational Fluid Dynamics (CFD) code. Master’s thesis, Lappeenranta-Lahti University of Technology LUT. 59 p. https://urn.fi/URN:NBN:fi-fe20231002138218

 

THEME – Computational Modeling of Thermal-Hydraulic Phenomena, VTT

Research reports: 

Leskinen, J., Kouhia, V. 2025. System code simulation of the PWR PACTEL Nitrogen Experiment NCG-32R. VTT Research Report, VTT-R-00071-25. 23 p.