Conference timetable

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Tuesday February 23rd 2021

Registration8:00 – 8:30
Conference opening and welcome speech8:30 – 8:45
General session on DBA and SA long-term management strategies8:45 – 10:00
Coffee break10:00 – 10:30
General session on DBA and SA long-term management strategies10:30 – 12:00
Lunch12:00 – 13:00
Technical session 1: Debris generation and transport13:00 – 14:30
Coffee break14:30 – 15:00
Technical session 1: Debris generation and transport15:00 – 16:30
Festive dinner19:00 – 22:00

Wednesday February 24th 2021

Technical session 2: Filtration systems performance, clogging issues8:30 – 10:00
Coffee break10:00 – 10:30
Technical session 2: Filtration systems performance, clogging issues10:30 – 12:00
Lunch12:00 – 13:00
Technical session 3: Operational conditions, including severe accidents and systems reliability13:00 – 14:30
Coffee break14:30 – 15:00
Technical session 3: Operational conditions, including severe accidents and systems reliability15:00 – 16:30

—Thursday February 25th 2021

Concluding session: Synthesis of technical discussions and needs for further research8:30 – 10:00
Coffee break10:00 – 10:30
Concluding session: Synthesis of technical discussions and needs for further research10:30 – 12:00
Lunch12:00 – 13:00
Visit of VUEZ facilities13:00 – 15:00

General session on DBA and SA long-term management strategies:

The general session will tentatively be organized with four invited speakers with the objective to provide background on:

  • Standards and safety requirements/expectations for core and containment cooling
  • Long term management strategies of core and containment cooling  during accidents
  • Core and containment cooling issues for Design Basis Accident (DBA) and for Severe Accident (SA).
  • Review of the R&D research in the fields and remaining open issues
  • Status of implementation of Fukushima Daïchi lessons learnt
  • Approaches for new small and large reactor design incorporating the Fukushima Daïchi lessons

Technical session 1: Debris generation and transport

This session will cover both experimental, modeling and reactor application related to the following topics:

  • Debris generation in both DBA and SA conditions (coating material degradation, concrete, corrosion productsy…)
  • Influence of jet shifts on the release of debris for a pipe break
  • Characterization of generated debris (composition, size, fragmentation,…)
  • Debris transport mechanisms
  • Fukushima lessons learnt (large amount of debris and sediments that affect long term management)

Technical session 2: Filtration systems performance, clogging issues

This session will cover both experimental, modeling and reactor application related to the following topics:

  • ECCS performance in long term accident conditions
  • Effect of solid debris as well as chemical effects, which can cause gelatinous material, on filtration system performance
  • Influence of the thin bed effect on head loss across the screen
  • Influence of large amount of debris and sediments on long term accident – Fukushima lessons learnt
  • System improvement
  • Accident management measures (In vessel Melt Retention, mobile water cooling system)
  • Fukushima lessons learnt (Filtration systems upgrade in existing reactors)
  • Status of filtration system implementation in the new small and large reactor design

Technical session 3: Operational conditions, including severe accidents, and systems reliability

This session will cover both experimental, modeling and reactor application related to the following topics:

  • Long term behavior
  • Pressure drop
  • Material corrosion
  • Chemical reaction, allowing the debris bed to be packed more densely
  • Debris and fibers interaction,…
  • System improvement (passive cooling system,…)
  • Accident management measures (IVR, mobile water cooling systems,…)
  • Fukushima lessons learnt (system upgrade)
  • Innovative systems and strategies implementation in new small and large reactor design

Concluding session: Synthesis of technical discussions and needs for further research