Ka cika wannan jumla: A ranar 11 ga Maris, 2011, girgizar ƙasa da tsunami da aka yi a Tōhoku sun jawo haɗarin nukiliya dabam-dabam, wanda ya fi muni shi ne hadarin nukiliya na Fukushima Daiichi. A kimanin minti tamanin bayan da
Tsunami ya buge, yanayin zafin jiki a cikin Unit 1 na Fukushima Daiichi Nuclear Power Plant ya kai sama da 2,300 ̊C, yana haifar da tsarin tattara man fetur, sandunan sarrafawa da man fetur na nukiliya don narkewa da samar da corium. (Ba a tantance yanayin yanayin man fetur da ya lalace ba amma ana zaton ya zama mai narkewa.) An sami nasarar kunna tsarin sanyaya na tsakiya na reactor (RCIC) don Unit 3; duk da haka, Unit 3 RCIC daga baya ya kasa, kuma a kusan 09:00 a ranar 13 ga Maris, man fetur na nukiliya ya narke cikin corium. Unit 2 ya ci gaba da ayyukan RCIC dan kadan kuma ba a yi imani da corium ya fara tattarawa a kan matattarar matattarar ba har zuwa kusan 18:00 a ranar 14 ga Maris. TEPCO ta yi imanin cewa matattarar man fetur ta fadi daga cikin jirgin ruwa mai matsin lamba zuwa kasa na jirgin ruwa na farko, kuma ta sami ragowar man fetur a kasa na jirgin ruwa na farko.