Cika wannan jumla: A ranar 20 ga Maris, 1978, gazawar samar da wutar lantarki ga tsarin kayan aikin da ba na nukiliya ba ya haifar da bushewar injin janareta (ref NRC LER 312/78-001). Wannan ya haifar da kashewar atomatik na reactor. A cikin takaddar shekara ta 2005, Hukumar Kula da Nukiliya ta Amurka ta nuna cewa shi ne na uku mafi tsanani da ya shafi tsaro a Amurka har zuwa yau (bayan da aka yi a shekarar 2005).
Hatsarin Three Mile Island da kuma Browns Ferry Cable Tray wuta). Ma'aikatan Hukumar Kula da Harkokin Nukiliya ta Amurka (NRC) sun yanke shawarar cewa mahimman kuskuren ƙira waɗanda masu aikin shuka da NRC kanta suka sani sune tushen matsalar kuma ya kamata a gyara su shekaru da suka gabata. "A takaice dai, akwai bayanai kuma an san su wanda zai iya hana wannan wucewar sanyaya; amma ba tare da isassun gyare-gyaren shuka ba, ya kamata a yi tsammanin faruwar lamarin", in ji ma'aikatan.