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Juhani Hyvärinen

LUT University

Lappeenranta

Finland

SCHOLARLY PAPERS

7

DOWNLOADS

320

TOTAL CITATIONS

4

Scholarly Papers (7)

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1.

Global Sensitivity Analysis of Nuclear District Heating Reactor Primary Heat Exchanger Optimization

Number of pages: 27 Posted: 04 Apr 2024
Jussi Saari, Mariia Kozlova, Heikki Suikkanen, Ekaterina Sermyagina, Juhani Hyvärinen and Julian Scott Yeomans
affiliation not provided to SSRN, LUT University, affiliation not provided to SSRN, LUT University, LUT University and affiliation not provided to SSRN
Downloads 117 (608,822)

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district heating, Small modular reactors, heat exchanger optimization, cuckoo search, variance-based sensitivity analysis, uncertainty analysis

2.

Helical Coil Steam Generator Stability Experiments with the Motel Test Facility

Number of pages: 14 Posted: 04 Jun 2024
Vesa Riikonen, Joonas Telkkä, Virpi Kouhia, Markku Puustinen, Giteshkumar Patel, Lauri Pyy, Antti Räsänen, Eetu Kotro, Juhani Hyvärinen and Afeef Murad
LUT University, LUT University, LUT University, LUT University, LUT University, LUT University, LUT University, LUT University, LUT University and LUT University
Downloads 70 (883,195)
Citation 1

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Small modular reactor, helical coil steam generator, flow stability, MOTEL test facility

3.

CRAFTY – a new separate-effect-test facility at LUT University for two-phase critical flow studies in transient nature

Number of pages: 24 Posted: 08 Nov 2025
Lauri Pyy, Giteshkumar Patel, Eero Karola, Hovi Tatu, Juhani Hyvärinen, Eetu Kotro, Juha Karppinen and Antti Räsänen
LUT University, LUT University, VTT Technical Research Centre of Finland, VTT Technical Research Centre of Finland, LUT University, LUT University, LUT University and LUT University
Downloads 41 (1,170,409)

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Two-phase critical flow (TPCF), steam generator tube rupture (SGTR), Separate-effect-test (SET) facility, primary-to-secondary (PRISE) leak, length-to-diameter (L/D) ratio, simulation model

4.

Flow Oscillation Fade-Out and Pool Water Level Effect Experiments on Open Loop Passive Cooling System

Number of pages: 32 Posted: 31 Dec 2024
Joonas Telkkä, Vesa Riikonen, Antti Räsänen, Eetu Kotro and Juhani Hyvärinen
LUT University, LUT University, LUT University, LUT University and LUT University
Downloads 35 (1,249,711)

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Passive containment heat removal, Open loop natural circulation, Oscillation fade-out, Countercurrent flow limitation, PASI test facility

5.

Contribution of Transient Heat Transfer to Overpressure Protection in a Passive Boiling Water Reactor

Number of pages: 21 Posted: 24 May 2024
Aleksandr Pomogaev, Juhani Hyvärinen and Juhani Vihavainen
LUT University, LUT University and LUT University
Downloads 26 (1,372,601)

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ICS, BWRX-300, Passive safety system analysis, massive metal structures, Small Modular Reactors

6.

Experiments on Open Loop Passive Cooling of Nuclear Reactor Containment: Quasi-Steady-State Heat Removal, Dynamic Loads, and Feasibility of Practical Periodic Testing

Number of pages: 35 Posted: 17 Apr 2024
Joonas Telkkä, Vesa Riikonen, Virpi Kouhia, Markku Puustinen, Lauri Pyy, Antti Räsänen, Eetu Kotro and Juhani Hyvärinen
LUT University, LUT University, LUT University, LUT University, LUT University, LUT University, LUT University and LUT University
Downloads 20 (1,448,301)
Citation 3

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passive containment heat removal, open loop natural circulation, two-phase flow oscillations, PASI test facility

7.

Design and Analysis of a Bedrock-Coupled Passive Heat Removal System for a Small Modular Reactor

Number of pages: 25 Posted: 29 Apr 2026
Aleksandr Pomogaev, Juhani Hyvärinen, Giteshkumar Patel and Juhani Vihavainen
LUT University, LUT University, LUT University and LUT University
Downloads 11 (1,548,648)

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Passive Safety Systems, SMR, district heating, natural circulation, condensation