On March 11th 2011, an earthquake of magnitude 9.0 occurred
off northeastern Japan, causing a tsunami and damaging the
Fukushima Daiichi Nuclear Power Plant (FNPP1). As a result,
radioactive products were released in the atmosphere. During
the emergency phase, the Institute of Radiation Protection and
Nuclear Safety (IRSN) was asked to provide its expertise in
support of the French authorities. Since then, the institute has