This report presents the status of the In-Vessel Core Retention Strategy Concerted Action (IVCRS CA) carried out within the frame of the 4th Framework Program funded by the European commission (after 6 months duration). The progress realized in WP1, Definition of Technical Requirements and Safety Approach, shows that the proposed approach fit well the existing safety requirements for future LWRs. In WP2, State of the Art for In-Vessel Retention, literature surveys on different topics have been carried out: corium pools, thermal-hydraulics of a gap, reactor pit flooding etc÷÷.. In WP3, Research of Prevention and Mitigation Means, proposals have been made for the research of alternative in-fuel and in-core structure, in order to prevent core fusion. On the other hand, different concepts of in-vessel core retention have been identified by the partners of the project. Finally in WP4, a preliminary assessment of the DIVER concept by the mean of computer code calculations has just started.
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