On the cover: Color-enhanced satellite image of the Fukushima Daiichi nuclear power plant (Japan), September 2013. An IRSN expert at the Cruas-Meysse nuclear power plant (Ardèche department, France) during the Complementary Safety Assessments in 2011. Measuring radioactivity using a Safecast device in the Fukushima region. Estimating post-accident zoning during an exercise in Chinon (Indre-et-Loire department, France), December 2020. P.4 JAPAN 2011 The accident at Fukushima Daiichi What happened? P.6 irsn.fr/R48-EN Online WEBMAG READ JAPAN 2021 © EDF Contents Ten years later What is the state of affairs? P.8 SAFETY Extreme risks Enhanced protection for nuclear facilities Station blackout diesel generator Safety Local emergency centers to stand firm during extreme situations Assessments made during design READ Severe accidents Ultimate heat sink performance Tricastin nuclear power plant Dike reinforcements follow assessment Research Innovative materials P.14 EMERGENCY Research Understanding and modeling the accident Emergency management and recovery READ Defining new zoning P.18 HEALTH Population protection What progress has been made in ten years? P.20 ENVIRONMENT Environmental contamination Emergency Three questions for Patricia Dupuy on IRSN's Emergency Center Models are progressing 2011-2021 IRSN's actions © France 3 Normandie P.22 IRSN READ Emergency Post-accident management should include social consequences Page 2 - Repères No. 48 - March 2021https://www.irsn.fr/R48-EN https://www.irsn.fr/FR/IRSN/Publications/Magazine-Reperes/Pages/S_abonner.aspx