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International Cooperation


  • OECD-ATLAS project has been successfully completed from April 2014 to March 2017;
  • 19 organizations from 16 countries have joined the OECD-ATLAS project.
  • OECD-ATLAS project has contributed to;
  • Investigation on Design Extension Conditions focusing on multiple high-risk failures
  • Validation of the safety analysis codes especially for multi-dimensional behaviors and advanced passive safety features
  • Resolution of scaling issues in the field of integral effect test application
  • The second OECD-ATLAS project (OECD-ATLAS-II) will be launched at October 2017;
  • 8 tests on 5 topics are identified by considering safety importance and relevance.


  • The general objective is to address the state-of-art simulation capability of 3-dimensional (3D) phenomena relevant to nuclear safety with system-scale(SYS) thermal-hydraulic (TH) codes.
  • This program was launched with the period of three years (January 2016 ~December 2018)
  • The leading organizations are France (IRSN, CEA) and Korea (KAERI) and the participants include
  • Belgium (BelV), Canada (CNSC), France (EdF, CEA, IRSN), Germany (GRS), Hungary (MTA-EK), Italy (NINE, ENEA), Korea (KINS, PNU, KAERI).

IRSN (France): Collaboration for core coolability in the loss of coolant accident

  • Specific topic of co-operation (STC no. 3): coolability of deformed fuel assembly during LOCA
  • Coolability of deformed fuel with fuel relocation (for Large Break LOCA)
  • Coolability of deformed fuel in medium and high pressure conditions (for Small Break LOCA)
  • Programs and codes
  • IRSN program & code: COAL program and DRACCAR code
  • KAERI program & code: ATHER program and SPACE code
  • Types of collaborations
  • Exchange of technical information and experimental data for core coolability
  • Exchange of code execution files required to code coupling
  • Validation of multi-physics codes by bench mark problems

European Project IVMR (In-Vessel Melt Retention)

  • Research and Innovation Action of the HORIZON 2020 Program funded by the European Commission
  • Objective: IVMR research for high power nuclear reactors of PWR, BWR, VVER
  • Leading Organization: IRSN in France (Dr. Florian Fichot)
  • Project Period: June 30, 2015 – May 31, 2019
  • Main Tasks
  • Methodology, Modelling and Reactor Calculation under ERVC (External Reactor Vessel Cooling)
  • Experiments of Thermal Load to Reactor Vessel Wall under ERVC
  • Experiments on Vessel External Cooling and Long Term Stabilization
  • New Ideas for IVMR

ISAMM (International Severe Accident Management Meeting)

  • Objective: International Seminar on SAM (Severe Accident Management) for 3-4 days
  • Lead Organizations: CNSC in Canada, KAERI, IRSN in France (Approved by PRG/CSNI)
  • Milestones
  • Develop outline of Seminar Program: October 2017
  • Hold the Seminar: Fall 2018
  • Issue the Seminar Report: Fall 2019


  • FONESYS: Forum & Network of System Thermal-Hydraulic Codes in Nuclear Reactor Safety
  • An international network among system thermal hydraulics code developers to create a common ground for discussing envisaged improvements in various areas of system thermal hydraulics, promoting cooperation aimed at the improvement and the application of the system thermal hydraulics codes and sharing the experimental data for code validation.
  • SILENCE: Network of Significant Light and heavy Water Reactor Thermal-Hydraulic Experiments for the Consistent Exploitation of the Data
  • SILENCE network promotes and fosters the establishment of a common ground for cooperation and discussion, so as to drive the prioritization and decision-making processes related to
  • development of new experiments and optimized utilization of existing data.