日本原子力研究開発機構
Early during the Fukushima Daiichi nuclear disaster, the ASN stated that they believed the events unfolding should be rated a 5 or even a 6 on the International Nuclear Event Scale when the Japan Atomic Energy Agency had listed them a day before as a level 4 event. Later on they said they believed the situation had surpassed that of a level 5 event and moved to a level 6. Their opinion was shared by the Finnish nuclear authorities.