Proceedings

Tuesday, October 21, 2025


Opening Plenary Session

Harri Varjonen, Chair of the SYP2025 organizing committee
Opening of SYP2025

Sakari Puisto, Minister of Economic Affairs
Opening words

Carl Berglöf, Ministry of Climate and Enterprise, Sweden
Preparations for New Nuclear Power in Sweden

Kim Dahlbacka, Westinghouse
New Nuclear Energy in Nordics – Repeating the success story from the seventies

Jussi Heinonen, STUK
Legislative Reform and Its Effects on Nuclear Energy in Finland

Plenary Session

Petra Lundström, Fortum
Nuclear Future Outlook and Fortum

Veli-Pekka Nurmi, TVO
Nuclear safety and overall safety for a nuclear operator under current safety conditions 

Philip von Segebaden and Katherine Dunne, Novatron Fusion Group
Novatron Fusion Group - in preparation for industrialization of fusion energy

Antti Hakola, Vice Chair of Finnish Nuclear Society
Awarding the Pekka Jauho prize 2025

SMR and Gen IV

Paula Keto, VTT
Lessons Learned from SAFER2028 SMR Siting and Waste Management Project (SMRSiMa)

Sami Naumer (VTT):
Characterisation and Transport Modelling of Spent Nuclear Fuel from LWR SMRs
- Paper
- Presentation

Timothy Schatz (VTT):
Small and Advanced Modular Reactor Waste Generation and Management in EURAD-2 WP4 FORSAFF

Pyry-Pekka Koistinen (Fortum):
Operational Maturity of GEN IV Reactor Designs

Jenna Järvenpää (VTT):
Comparison of Gaussian Plume models for SMRs in urban areas

Jyri Rökman (VTT):
Strategic Optionality and Flexibility in SMR Investments for Process Industry, District Heating, and Data Centers: A Scenario and Real Options Approach

Nuclear Fusion Technology

Tomas Lindén (Helsinki Institute of Physics):
An overview of recent fusion developments

Samuli Saari (VTT):
ERO2.0 modelling of divertor marker erosion in ASDEX Upgrade L-mode experiments

Aaro Järvinen (VTT):
Accelerating Fusion Science and Technology Development with AI

Karoliina Salminen (VTT):
DEMO breeding blanket remote maintenance concepts and challenges

Changyang Li (LUT University):
Remote Maintenance Strategies and Equipment for DEMO Port Systems

Markus Airila (VTT):
Nordic site selection pre-study for Novatron 3 fusion demonstration facility

Nuclear Fuel and Reactor Materials

Michael Lewis (Westinghouse):
Performance of Fuel Technology on AP1000™ Reactors

Björn Andersson (Westinghouse):
TRITON11 fuel performance evaluation

Jan Höglund (Westinghouse): 
Westinghouse VVER-440 design upgrade

Innovative Solutions and Future Technologies

Antti Räty (VTT):
Applying digital twins and ontology for robot assisted decommissioning operations (Euratom project DORADO)

Pyry Aho (Fortum):
Utilizing Large Language Models to Improve Requirements Tracing in the Nuclear Energy Domain
- Paper

Björn Andersson (Westinghouse):
Westinghouse AI application for visual inspections

Thor Lindberg (AFRY Sweden):
Novel features of the AFRY Intelligent Scenario Modelling (AISM) tool including PSA studies and sensitivity calculations of radionuclide transport and doses

Wednesday, October 22, 2025


Plenary Session

Mika Finska, Business Finland
Nuclear IPCEI meaning for Finland

Johanna Hansen, R&D Coordinator, Posiva
Commissioning phase of the world’s first SNF repository in Olkiluoto

Hannu Tuulensuu, Head of Nuclear Safety Design, Steady Energy
Status of LDR-50 Safety Demonstration

Society and Safety Culture

Timo Hakulinen (CERN):
Experience and future perspectives of application of different safety norms in the Personnel Protection Systems of CERN particle accelerators

Kaupo Viitanen (VTT):
Implementing Internal Independent Nuclear Safety Oversight (INSO) in the Nordic Nuclear Industry

Sami Karadeniz (VTT):
Organizational Lessons Learned from the Olkiluoto 3 Commissioning Project

Maria Nordlund (Platom):
The Finnish Nuclear Licensing Process – General Description

Kirsi Hassinen (Platom):
Government's proposal for the new Nuclear Energy Act in Finland, some of its main impacts

Roope Marttila (SEATOM Technologies):
Public Perception of Nuclear-Powered Ships in Finland, Germany, and the Netherland

Jussi-Pekka Ikonen (VTT):
The Potential Impact of Nuclear Energy on Data Centers

Nadezhda Gotcheva (VTT):
“Make-it-work”: Developing operational and organizational concepts for SMRs

Nuclear Waste Management

Riina Rimppi (Radiation and Nuclear Safety Authority):
Non-Destructive Assay of Spent Nuclear Fuel Prior to Geological Disposal in Finland
- Paper
- Presentation

Erik Brücken (University of Helsinki):
On Improving Nuclear Fuel Imaging Using Position Sensitive Detectors
- Paper
- Presentation

Weronika Wojnicka (Fortum):
Applicability of NURES® Ion Exchange Materials for Holistic Radioactive Liquid Waste Treatment

Joseph Ridao (Karlsruhe Institute of Technology):
Decommissioning of Nuclear Buildings: German Knowledge at European Level

Leena Torpo (Cyclife – EDF Group):
A new treatment facility for contaminated metals in Sweden

Juho Rasmus (University of Oulu):
Nuclear Safety and How Geopolymers can be a Part of Solution?

Ville Oinonen (Fortum):
Final Disposal of Nuclear Waste in Finland and Special Challenges

Wade Karlsen (VTT):
Considering decommissioning waste in new reactor materials selection

Nuclear Fuel and Reactor Materials

Lukasz Kurpaska (National Center for Nuclear Research, PL):
Developing a new class of materials resistant to radiation, temperature, and corrosion - NOMATEN Center of Excellence initiative.

Jenna Järvenpää (VTT):
Impact via international scientific collaboration - Examples from VTT-NOMATEN activities

Jussi Peltonen (Westinghouse):
Development and licencing of STAV8 fuel performance code

Miika Wallius (TVO):
Determination of Recovery Time Distributions for Water Supply Systems for Level 2 PRA
- Paper
- Presentation

Markus Olin (VTT):
HTGR fuel and graphite back-end – GEMINI 4.0 results

Joona Saira (TVO):
Load Follow Operation Capability of Olkiluoto 1 & 2: A Fuel Performance Perspective

William Cleary (Westinghouse):
Specialized use of additive manufacturing techniques to prototype and evaluate next generation spacer grids

Shanrandeet Singh (LUT University):
Advancing the Understanding of Non-Condensable Gases in Reactor Coolant Systems: Summary of the NCGDENSE Program
- Paper
- Presentation