Creating the foundations for safe nuclear power in Finland – Thermal hydraulics, safety analyses, safety justification methods research at the LUT University, 2000–2023 | 2024 Publication type A1 Journal article (refereed), original research Author(s) Hyvärinen Juhani, Riikonen Vesa, Telkkä Joonas, Hujala Elina, Kouhia Virpi, Puustinen Markku, Patel Giteshkumar, Pyy Lauri, Vihavainen Juhani, Suikkanen Heikki, Rintala Ville Energy - Transition to carbon-neutral world Nuclear Energy and Engineering LUT School of Energy Systems
Experiments on open loop passive cooling of nuclear reactor containment: Quasi-steady-state heat removal, dynamic loads, and feasibility of practical periodic testing | 2024 Publication type A1 Journal article (refereed), original research Author(s) Telkkä Joonas, Riikonen Vesa, Kouhia Virpi, Puustinen Markku, Pyy Lauri, Räsänen Antti, Kotro Eetu, Hyvärinen Juhani Energy - Transition to carbon-neutral world Nuclear Energy and Engineering LUT School of Energy Systems
Frequency and amplitude of flashing-induced instability in an open natural circulation loop | 2024 Publication type A1 Journal article (refereed), original research Author(s) Dené Paul, Montout Michael, Garcia Eric, Telkkä Joonas, Riikonen Vesa, David Franck Energy - Transition to carbon-neutral world Nuclear Energy and Engineering LUT School of Energy Systems
Helical coil steam generator stability experiments with the MOTEL test facility | 2024 Publication type A1 Journal article (refereed), original research Author(s) Riikonen Vesa, Telkkä Joonas, Kouhia Virpi, Puustinen Markku, Patel Giteshkumar, Pyy Lauri, Räsänen Antti, Kotro Eetu, Hyvärinen Juhani, Murad Afeef Energy - Transition to carbon-neutral world Nuclear Energy and Engineering LUT School of Energy Systems
Efficiency of Passive Open Loop Heat Removal over Wide Range of Loop Flow Resistances -- PASI Loop Tests in the EU-PASTELS Project | 2023 Publication type A4 Conference proceedings Author(s) Telkkä Joonas, Riikonen Vesa, Räsänen Antti, Kotro Eetu, Hyvärinen Juhani Energy - Transition to carbon-neutral world Nuclear Energy and Engineering LUT School of Energy Systems
Passive heat exchanger experiments (PAHE) | 2023 Publication type D2 Article in a professional research book (incl. editor’s introduction) Author(s) Riikonen Vesa, Kouhia Virpi, Telkkä Joonas, Pyy Lauri Energy - Transition to carbon-neutral world Nuclear Energy and Engineering LUT School of Energy Systems
PWR PACTEL tests (PATE) | 2023 Publication type D2 Article in a professional research book (incl. editor’s introduction) Author(s) Riikonen Vesa, Kouhia Virpi, Telkkä Joonas, Pyy Lauri, Räsänen Antti, Kotro Eetu Energy - Transition to carbon-neutral world Nuclear Energy and Engineering LUT School of Energy Systems
Natural circulation experiment with the PASI facility – observations on phenomena with an open passive heat removal loop | 2022 Publication type A4 Conference proceedings Author(s) Riikonen Vesa, Kouhia Virpi, Telkkä Joonas, Hyvärinen Juhani Other Focus Area Energy - Transition to carbon-neutral world Nuclear Energy and Engineering LUT School of Energy Systems
PWR PACTEL SBLOCA experiments with common-cause failures of cold side SIS check valves | 2022 Publication type Other Author(s) Riikonen Vesa Nuclear Energy and Engineering LUT School of Energy Systems
Supplementary PWR PACTEL SBLOCA experiments with common-cause failures of cold side SIS check valves | 2022 Publication type Other Author(s) Riikonen Vesa Nuclear Energy and Engineering LUT School of Energy Systems
PASI – A test facility for research on passive heat removal | 2021 Publication type A4 Conference proceedings Author(s) Kouhia Virpi, Riikonen Vesa, Kauppinen Otso-Pekka, Telkkä Joonas, Hyvärinen Juhani Nuclear Energy and Engineering LUT School of Energy Systems
PASI – A test facility for research on passive heat removal | 2021 Publication type A1 Journal article (refereed), original research Author(s) Kouhia Virpi, Riikonen Vesa, Kauppinen Otso-Pekka, Telkkä Joonas, Hyvärinen Juhani Nuclear Energy and Engineering LUT School of Energy Systems
PASI facility description for PASTELS | 2021 Publication type Other Author(s) Telkkä J, Kouhia V, Riikonen V, Karppinen J, Räsänen A, Kotro E Energy - Transition to carbon-neutral world Nuclear Energy and Engineering LUT School of Energy Systems
Passive heat exchanger experiments (PAHE) | 2021 Publication type D2 Article in a professional research book (incl. editor’s introduction) Author(s) Riikonen Vesa, Kouhia Virpi, Telkkä Joonas, Pyy Lauri Energy - Transition to carbon-neutral world Nuclear Energy and Engineering LUT School of Energy Systems
PWR PACTEL tests (PATE) | 2021 Publication type D2 Article in a professional research book (incl. editor’s introduction) Author(s) Riikonen Vesa, Kouhia Virpi, Pyy Lauri Energy - Transition to carbon-neutral world Nuclear Energy and Engineering LUT School of Energy Systems
PASI tests for VTT projects | 2020 Publication type Other Author(s) Telkkä Joonas, Pyy Lauri, Riikonen Vesa Nuclear Energy and Engineering LUT School of Energy Systems
PWR PACTEL Nitrogen Experiment NCG-30 | 2020 Publication type Other Author(s) Kouhia Virpi, Riikonen Vesa Nuclear Energy and Engineering LUT School of Energy Systems
General description of the PWR PACTEL test facility – fourth edition | 2019 Publication type Other Author(s) Kouhia Virpi, Riikonen Vesa, Partanen Harri, Räsänen Antti, Kauppinen Otso-Pekka, Telkkä Joonas, Pyy Lauri, Tielinen Kimmo Nuclear Energy and Engineering Energy LUT School of Energy Systems
Integral and separate effects tests on thermal-hydraulic problems in reactors (INTEGRA) | 2019 Publication type D2 Article in a professional research book (incl. editor’s introduction) Author(s) Riikonen Vesa, Kouhia Virpi, Kauppinen Otso-Pekka, Telkkä Joonas Nuclear Energy and Engineering LUT School of Energy Systems
PASI - a test facility for research on passive heat removal | 2019 Publication type Other Author(s) Kouhia Virpi, Riikonen Vesa, Kauppinen Otso-Pekka, Telkkä Joonas, Hyvärinen Juhani Nuclear Energy and Engineering LUT School of Energy Systems
PASI Natural Circulation Test NC-03 | 2019 Publication type Other Author(s) Telkkä Joonas, Riikonen Vesa Nuclear Energy and Engineering LUT School of Energy Systems
PASI test plans | 2019 Publication type Other Author(s) Riikonen Vesa, Purhonen Heikki, Kauppinen Otso-Pekka, Kouhia Virpi, Telkkä Joonas, Räsänen Antti, Kotro Eetu, Tielinen Kimmo
Plans for the PWR PACTEL inadvertent opening of SV and MSRT tests | 2019 Publication type Other Author(s) Riikonen Vesa, Pyy Lauri
Plans for the PWR PACTEL nitrogen effect tests, PATE 4/2019 | 2019 Publication type Other Author(s) Riikonen Vesa, Kouhia Virpi Nuclear Energy and Engineering Energy LUT School of Energy Systems
System code analysis of accumulator nitrogen discharge during LOCA experiment at PWR PACTEL test facility | 2019 Publication type A1 Journal article (refereed), original research Author(s) Kauppinen Otso-Pekka, Kouhia Virpi, Riikonen Vesa, Hyvärinen Juhani
The PWR PACTEL nitrogen experiments in the OECD/NEA PKL Phase 4 project | 2019 Publication type Other Author(s) Riikonen Vesa
Experimental observation of adverse and beneficial effects of nitrogen on reactor core cooling | 2018 Publication type A1 Journal article (refereed), original research Author(s) Riikonen Vesa, Kouhia Virpi, Kauppinen Otso-Pekka, Sjövall Heikki, Hyvärinen Juhani
General description of the PASI test facility, second edition | 2018 Publication type Other Author(s) Kouhia Virpi, Riikonen Vesa, Telkkä Joonas, Partanen Harri, Räsänen Antti, Kauppinen Otso-Pekka, Kotro Eetu, Saure Ilkka, Tielinen Kimmo, Karppinen Juha Nuclear Energy and Engineering Energy LUT School of Energy Systems
PASI facility – characterizing experiments | 2018 Publication type Other Author(s) Kouhia Virpi, Riikonen Vesa Nuclear Energy and Engineering Energy LUT School of Energy Systems
PWR PACTEL pump trip experiments | 2018 Publication type Other Author(s) Riikonen Vesa, Kouhia Virpi, Kauppinen Otso-Pekka Nuclear Energy and Engineering Energy LUT School of Energy Systems
Quick look report of the PWR PACTEL nitrogen reference experiment in the OECD/NEA PKL phase 4 project | 2018 Publication type Other Author(s) Riikonen Vesa Nuclear Energy and Engineering Energy LUT School of Energy Systems
Integral and separate effects tests on thermal-hydraulic problems in reactors (INTEGRA) | 2017 Publication type D2 Article in a professional research book (incl. editor’s introduction) Author(s) Riikonen Vesa, Kouhia Virpi, Kauppinen Otso-Pekka, Telkkä Joonas Nuclear Energy and Engineering Energy LUT School of Energy Systems
Coupled one-dimensional and CFD models for the simulation of steam generators | 2016 Publication type A1 Journal article (refereed), original research Author(s) Hovi Ville, Pättikangas Timo, Riikonen Vesa Engineering LUT School of Energy Systems
PWR PACTEL nitrogen experiments | 2016 Publication type Other Author(s) Riikonen Vesa, Kouhia Virpi, Kauppinen Otso-Pekka
PWR PACTEL typpikokeiden alustava koesuunnitelma | 2016 Publication type Other Author(s) Riikonen Vesa, Kouhia Virpi Nuclear Energy and Engineering LUT School of Energy Systems
ANALYSIS OF REVERSE FLOW IN LOW-RISE INVERTED U-TUBE STEAM GENERATOR OF PWR PACTEL FACILITY | 2015 Publication type A4 Conference proceedings Author(s) Kauppinen Otso-Pekka, Riikonen Vesa, Kouhia Virpi, Hyvärinen Juhani Energy Engineering LUT School of Energy Systems
Computer analyses on loop seal clearing experiment at PWR PACTEL | 2015 Publication type A1 Journal article (refereed), original research Author(s) Kauppinen Otso-Pekka, Kouhia Virpi, Riikonen Vesa, Hyvärinen Juhani, Sjövall Heikki Nuclear Energy and Engineering LUT School of Energy Systems
PWR PACTEL experiments (PAX) | 2015 Publication type D3 Professional conference proceedings Author(s) Riikonen Vesa, Kouhia Virpi, Kauppinen Otso-Pekka, Telkkä Joonas, Purhonen Heikki Nuclear Energy and Engineering LUT School of Energy Systems
PWR PACTEL flow reversal experiments | 2015 Publication type Other Author(s) Riikonen Vesa, Kouhia Virpi, Kauppinen Otso-Pekka Nuclear Energy and Engineering LUT School of Energy Systems
General description of the PWR PACTEL test facility - third edition, Technical report, PAX 2/2014 | 2014 Publication type D4 Published development or research report or study Author(s) Kouhia Virpi, Riikonen Vesa, Partanen Harri, Räsänen Antti, Kauppinen Otso-Pekka, Telkkä Joonas, Pyy Lauri Nuclear Energy and Engineering LUT School of Energy Systems
Simulations on PWR PACTEL CNC and SBO experiments, Research Report, PAX 3/2014 | 2014 Publication type D4 Published development or research report or study Author(s) Kouhia Virpi, Kauppinen Otso-Pekka, Riikonen Vesa Nuclear Energy and Engineering LUT School of Energy Systems
Station blackout experiments, Research Report, PAX 1/2014 | 2014 Publication type D4 Published development or research report or study Author(s) Riikonen Vesa, Kouhia Virpi, Kauppinen Otso-Pekka Nuclear Energy and Engineering LUT School of Energy Systems
Benchmark exercise on SBLOCA experiment of PWR PACTEL facility | 2013 Publication type A1 Journal article (refereed), original research Author(s) Kouhia Virpi, Riikonen Vesa, Kauppinen Otso-Pekka, Purhonen Heikki, Austregesilo Henrique, Bánáti József, Cherubini Marco, D'Auria Francesco, Inkinen Pasi, Karppinen Ismo, Kral Pavel, Peltokorpi Lauri, Peltonen Joanna, Weber Sebastian Nuclear Energy and Engineering LUT School of Energy Systems
BWR Suppression Pool Studies with POOLEX and PPOOLEX Test Facilities at LUT | 2013 Publication type A4 Conference proceedings Author(s) Puustinen Markku, Kyrki-Rajamäki Riitta, Tanskanen Vesa, Räsänen Antti, Purhonen Heikki, Riikonen Vesa, Laine Jani, Hujala Elina Nuclear Energy and Engineering Energy Engineering LUT School of Energy Systems
Cool down under Natural Circulation Conditions in Presence of Secondary side Isolated Steam Generators, Research Report, PAX 1/2013 | 2013 Publication type D4 Published development or research report or study Author(s) Riikonen Vesa, Kouhia Virpi, Kauppinen Otso-Pekka Nuclear Energy and Engineering LUT School of Energy Systems
General description of the PWR PACTEL test facility, the second edition, Technical report, PAX 2/2013 | 2013 Publication type D4 Published development or research report or study Author(s) Kouhia Virpi, Riikonen Vesa, Partanen Harri, Räsänen Antti, Kauppinen Otso-Pekka, Telkkä Joonas, Pyy Lauri Nuclear Energy and Engineering LUT School of Energy Systems
PWR PACTEL experiments (PAX) | 2013 Publication type D3 Professional conference proceedings Author(s) Riikonen Vesa, Kouhia Virpi Nuclear Energy and Engineering LUT School of Energy Systems
Three-dimensional CFD model of a NPP steam generator | 2013 Publication type A4 Conference proceedings Author(s) Pättikangas Timo, Hovi Ville, Niemi Jarto, Riikonen Vesa, Kouhia Virpi, Purhonen Heikki Nuclear Energy and Engineering LUT School of Energy Systems
Validation of RELAP5/mod3.3 against the PACTEL SBL-50 benchmark transient | 2013 Publication type A4 Conference proceedings Author(s) Bánáti József, Riikonen Vesa, Kouhia Virpi, Purhonen Heikki Nuclear Energy and Engineering LUT School of Energy Systems
Loop seal experiments with PWR PACTEL, Research Report, PAX 1/2012 | 2012 Publication type D4 Published development or research report or study Author(s) Riikonen Vesa, Kouhia Virpi, Kauppinen Otso-Pekka Nuclear Energy and Engineering LUT School of Energy Systems
PACTEL and PWR PACTEL Test Facilities for Versatile LWR Applications | 2012 Publication type A1 Journal article (refereed), original research Author(s) Kouhia Virpi, Purhonen Heikki, Riikonen Vesa, Puustinen Markku, Kyrki-Rajamäki Riitta, Vihavainen Juhani Nuclear Energy and Engineering LUT School of Energy Systems
Modeling of the PACTEL Facility and Simulation of a Small Break LOCA Experiment With the TRACE V5.0 Code | 2011 Publication type A4 Conference proceedings Author(s) Vihavainen Juhani, Riikonen Vesa, Puustinen Markku, Kyrki-Rajamäki Riitta Nuclear Energy and Engineering LUT School of Energy Systems
PWR PACTEL experiments at low pressures, Research Report, PAX 3/2011 | 2011 Publication type D4 Published development or research report or study Author(s) Riikonen Vesa, Kouhia Virpi Nuclear Energy and Engineering LUT School of Energy Systems
Study of flow reversing in vertical heat exchange tubes, PAX 4/2011 | 2011 Publication type D4 Published development or research report or study Author(s) Riikonen Vesa, Kouhia Virpi, Vihavainen Juhani Nuclear Energy and Engineering LUT School of Energy Systems
Summary Report OF PWR PACTEL Benchmark Experiment Blind Calculations, Research report, PAX 1/2011 | 2011 Publication type D4 Published development or research report or study Author(s) Riikonen Vesa, Kouhia Virpi Nuclear Energy and Engineering LUT School of Energy Systems
Summary Report of PWR PACTEL Benchmark Experiment Open Calculations, Research report, PAX 2/2011 | 2011 Publication type D4 Published development or research report or study Author(s) Riikonen Vesa, Kouhia Virpi Nuclear Energy and Engineering LUT School of Energy Systems
A New Integral Facility PWR PACTEL for Vertical Steam Generator Simulation | 2010 Publication type A4 Conference proceedings Author(s) Rantakaulio Antti, Kouhia Virpi, Riikonen Vesa, Räsänen Antti, Purhonen Heikki, Kyrki-Rajamäki Riitta Nuclear Energy and Engineering LUT School of Energy Systems
Cathare Assessment of PACTEL LOCA Experiments with Accident Management | 2010 Publication type A1 Journal article (refereed), original research Author(s) Sabotinov Luben, Purhonen Heikki, Riikonen Vesa Nuclear Energy and Engineering Energy Engineering (miscellaneous) LUT School of Energy Systems
New possibilities to simulate vertical steam generators with integral facility PWR PACTEL | 2010 Publication type A4 Conference proceedings Author(s) Kouhia Virpi, Kyrki-Rajamäki Riitta, Purhonen Heikki, Rantakaulio Antti, Riikonen Vesa, Räsänen Antti Nuclear Energy and Engineering LUT School of Energy Systems
TRACE code modeling of the horizontal steam generator of the PACTEL facility and calculation of a loss-of-feedwater experiment | 2010 Publication type A1 Journal article (refereed), original research Author(s) Vihavainen Juhani, Riikonen Vesa, Kyrki-Rajamäki Riitta Nuclear Energy and Engineering LUT School of Energy Systems
General description of the PWR PACTEL test facility, Research Report, YTY 1/2009 | 2009 Publication type D4 Published development or research report or study Author(s) Riikonen Vesa, Kouhia Virpi, Räsänen Antti, Partanen Harri Nuclear Energy and Engineering LUT School of Energy Systems
PACTEL integral test facility - Description of versatile applications | 2006 Publication type A1 Journal article (refereed), original research Author(s) Purhonen Heikki, Puustinen Markku, Riikonen Vesa, Kyrki-Rajamäki Riitta, Vihavainen Juhani
PACTEL – A VERSATILE FACILITY FOR RESEARCH OF THERMAL HYDRAULICS | 2005 Publication type A4 Conference proceedings Author(s) Purhonen Heikki, Puustinen Markku, Riikonen Vesa, Kyrki-Rajamäki Riitta, Vihavainen Juhani
Steam Blowdown Experiments with the Condensation Pool Test Rig | 2005 Publication type A4 Conference proceedings Author(s) Purhonen Heikki, Puustinen Markku, Riikonen Vesa, Kyrki-Rajamäki Riitta, Vihavainen Juhani, Räsänen Antti
Thermal Stratification Experiments with Circulation Flow in the Condensation Pool Test Rig. Lappeenranta: Lappeenranta University of Technology, Nuclear Safety Research Unit, Research Report, 2005, 23 p. + app. 13 p. (STRA 2/2005) | 2005 Publication type Other Author(s) Riikonen Vesa, Laine Jani Nuclear Energy and Engineering LUT School of Energy Systems
Suppression Pool Experiments with Non-Condensable Gas. Confidential. | 2004 Publication type Other Author(s) Riikonen Vesa, Laine Jani Nuclear Energy and Engineering LUT School of Energy Systems
Analyses of PACTEL passive safety injection experiments GDE-21 through GDE-25 | 1998 Publication type A1 Journal article (refereed), original research Author(s) Tuunanen Jari, Riikonen Vesa, Kouhia Jyrki, Vihavainen Juhani Engineering LUT School of Energy Systems
RELAP5 Analysis of Gravity-Driven Core-Cooling Experiments with PACTEL | 1997 Publication type A1 Journal article (refereed), original research Author(s) Munther Reijo, Vihavainen Juhani, Kalli Heikki, Kouhia Jyrki, Riikonen Vesa Engineering LUT School of Energy Systems