A ▁ED G ▁normally , ▁plant ▁operators ▁performed ▁an ▁emer gency ▁startup ▁of ▁the ▁ED G ▁by ▁activ ating ▁the ▁generator ' s ▁emer gency ▁start ▁" break - glass " ▁which ▁by pass ed ▁most ▁of ▁the ▁ED G ' s ▁saf eties ▁and ▁forced ▁it ▁to ▁start . ▁The ▁startup ▁was ▁successful . ▁R HR - A ▁was ▁then ▁started ▁using ▁power ▁from ▁ED G - A . ▁With ▁core ▁cool ing ▁restored , ▁the ▁S AE ▁was ▁down grad ed ▁to ▁an ▁alert ▁at ▁ 1 0 : 1 5   a . m . ▁At ▁ 1 1 : 4 0   a . m ., ▁cre ws ▁energ ized ▁R AT ▁ 1 - B ▁which ▁had ▁been ▁shut ▁down ▁for ▁maintenance , ▁rest oring ▁power ▁to ▁the ▁" B " ▁safety ▁elect rical ▁train . ▁At ▁ 1 2 : 5 7   p . m ., ▁the ▁" A " ▁safety ▁train ▁was ▁switched ▁from ▁the ▁ED G ▁to ▁R AT ▁ 1 - B ▁and ▁the ▁ED G ▁was ▁shut ▁down . ▁With ▁both ▁trains ▁receiving ▁off site ▁power , ▁the ▁alert ▁was ▁terminated ▁at ▁ 1 : 4 7   p . m . ▁ ▁The ▁temperature ▁of ▁the ▁Unit   1 ▁core ▁cool ant ▁increased ▁from ▁ ▁to ▁ ▁during ▁the ▁ 3 6   min utes ▁required ▁to ▁re - ener g ize ▁the ▁A - side ▁bus . ▁Through out ▁the ▁event , ▁non - v ital ▁power ▁was ▁continu ously