▁feed water ▁systems ▁as ▁well ▁as ▁upgrad ed ▁accident ▁local ization ▁systems . ▁ ▁The ▁larger ▁V VER - 1 0 0 0 ▁was ▁developed ▁after ▁ 1 9 7 5 ▁and ▁is ▁a ▁four - loop ▁system ▁hous ed ▁in ▁a ▁contain ment - type ▁structure ▁with ▁a ▁sp ray ▁steam ▁supp ression ▁system ▁( E mer gency ▁Core ▁C ool ing ▁System ). ▁V VER ▁re actor ▁designs ▁have ▁been ▁elabor ated ▁to ▁incorpor ate ▁automatic ▁control , ▁pass ive ▁safety ▁and ▁contain ment ▁systems ▁associated ▁with ▁Western ▁generation ▁III ▁react ors . ▁ ▁The ▁V VER - 1 2 0 0 ▁is ▁the ▁version ▁currently ▁offered ▁for ▁construction , ▁being ▁an ▁evolution ▁of ▁the ▁V VER - 1 0 0 0 ▁with ▁increased ▁power ▁output ▁to ▁about ▁ 1 2 0 0 ▁M We ▁( g ross ) ▁and ▁providing ▁additional ▁pass ive ▁safety ▁features . ▁ ▁In ▁ 2 0 1 2 , ▁Ros atom ▁stated ▁that ▁in ▁the ▁future ▁it ▁intended ▁to ▁cert ify ▁the ▁V VER ▁with ▁the ▁British ▁and ▁U . S . ▁regul atory ▁authorities , ▁though ▁was ▁unlikely ▁to ▁apply ▁for ▁a ▁British ▁lic ence ▁before ▁ 2 0 1 5 . ▁ ▁The ▁construction ▁of ▁the ▁first ▁V VER - 1 3 0 0 ▁( V VER - TO I ) ▁ 1 3 0 0 ▁M WE ▁unit ▁was ▁started ▁in ▁ 2 0 1 8 . ▁ ▁Design ▁▁ ▁The ▁Russian ▁abbre viation ▁V VER ▁stands ▁for ▁' water - water