▁and ▁h ired ▁construction ▁firm ▁Fl u or ▁to ▁replace ▁C B & I / Sh aw ▁on - site ▁man aging ▁the ▁day - to - day ▁work . ▁West ing house ▁purchased ▁certain ▁assets ▁of ▁the ▁former ▁Shaw ▁Group ▁from ▁C B & I ▁to ▁allow ▁the ▁project ▁to ▁go ▁forward . ▁In ▁ 2 0 1 6 , ▁Southern ▁Company ▁and ▁West ing house ▁added ▁construction ▁firm ▁Be cht el ▁to ▁the ▁project ▁to ▁share ▁construction ▁management ▁respons ib ilities . ▁ ▁Rec ent ▁construction ▁mil est ones ▁include ▁setting ▁the ▁final ▁of ▁the ▁" big ▁six " ▁struct ural ▁modules ▁for ▁Unit   3 ▁( CA - 0 2 ▁and ▁CA - 0 3 , ▁which ▁form ▁the ▁walls ▁of ▁a ▁storage ▁tank ▁that ▁is ▁part ▁of ▁the ▁re actor ' s ▁pass ive ▁cool ing ▁system ). ▁The ▁" big ▁six " ▁modules ▁also ▁include ▁the ▁previously ▁installed ▁CA - 0 1 , ▁CA - 0 4 , ▁and ▁CA - 0 5 ▁in - cont ain ment ▁struct ural ▁modules , ▁as ▁well ▁as ▁the ▁previously ▁installed ▁CA - 2 0 ▁struct ural ▁module ▁which ▁forms ▁part ▁of ▁the ▁internal ▁structure ▁of ▁the ▁auxili ary ▁building , ▁containing ▁many ▁of ▁the ▁re actor ' s ▁support ▁systems . ▁CA - 0 2 ▁and ▁CA - 0 3 ▁were ▁placed ▁within ▁the ▁contain ment ▁vessel ▁in ▁May ▁ 2 0 1 6 . ▁The ▁setting ▁of ▁these ▁modules ▁is ▁a ▁fairly ▁significant ▁mil estone ▁and ▁allows ▁other ▁construction