Cika wannan jumla:
Tsibirin Mile Uku a cikin 1979 an lasafta shi a matsayin haɗarin Mataki na 5 a kan sikelin INES saboda "mummunan lalacewar tsakiya na reactor" da kuma kwararar radiation da abin ya faru. Tsibirin Mile Uku shi ne hatsari mafi muni a tarihin cibiyoyin wutar lantarki na nukiliya na Amurka, duk da haka sakamakon ya bambanta da na hadarin Chernobyl. Wani binciken da Hukumar Kula da Nukiliya ta yi bayan faruwar lamarin ya nuna cewa kusan mutane miliyan 2 da ke kewaye da tsire-tsire na Three Mile Island <unk>an kiyasta sun sami matsakaicin adadin radiation na millirem 1 kawai sama da na yau da kullun. Bugu da ƙari, ba kamar waɗanda ke fama da radiation a cikin hadarin Chernobyl ba, ci gaban cutar sankarar thyroid a cikin mutanen da ke kusa da Tsibirin Three Mile ya kasance "mara ƙarfi da ƙarancin ci gaba".