Whakakiia te rerenga e whai ake nei: I whakamutua te hanganga o te tipu i te tau 1974 na te whakaheke moni me nga whakaeke taiao, engari i timata ano i te 1976. I whakakorehia te hanganga o te tipu i te mutunga i te tau 1980, i te wa i whakamutua ai e General Public Utilities (te kamupene matua o JCP&L) te hanganga "na te mea he uaua te putea mai i te
i te aitua i tana Three Mile Island facility", tae atu ki te koretake mehemea ka whakawhiwhia e te NRC he raihana, ka whakauruhia ranei etahi atu ture utu nui. Hei taapiri, ko te wehi o te hapori me te aitua hanga i mate ai tetahi kaimahi i awhina i te whakamutu i te hanganga o te tipu.