This OECD Nuclear Energy Agency (NEA) workshop will promote international exchange of information and practices related to maintaining the cooling function in a long term accident in a NPP including new design. Considering the outcomes from the previous related NEA projects and activities (as the working group on the long term management of a severe accident and the task group on sump clogging) as well as those resulting from the ongoing Fukushima-Daiichi-related actions and projects, the workshop objective is to carry out a comprehensive review to identify remaining knowledge gaps linked to the behavior of material, components and systems that are critical for maintaining cooling in the long term after an accident in a NPP. The workshop will offer the possibility to discuss the best way to address the identified gaps with additional experimental research and with consolidation of existing and/or new assessment methods and analytical tools.

Major topics of interest:

– Management strategies, for different NPP designs, of core and containment cooling on the long-term during accidents;
– Differences and similarities for Design Basis Accident (DBA) and for Severe Accident (SA);
– Debris sources and generation – with a focus on SA – and transport characterization;
– The filtration systems performance and clogging issues in general;
– SA conditions and erosion/corrosion phenomena.

The last day of the workshop, a visit of VUEZ experimental facility will be organized.

Viktoria experimental equipment built in VUEZ work place in Tlmace, Slovak republic