se ong ▁ 1 ▁started ▁in ▁ 1 9 7 6 ▁and ▁was ▁completed ▁in ▁ 1 9 8 2 . ▁In ▁the ▁following ▁year , ▁the ▁power ▁plant ▁began ▁commercial ▁operations . ▁This ▁P H WR ▁re actor ▁has ▁a ▁gross ▁generation ▁capacity ▁of ▁ 6 7 8   MW . ▁Wol se ong ▁react ors ▁ 2 , ▁ 3 ▁and ▁ 4 ▁were ▁completed ▁in ▁ 1 9 9 7 , ▁ 1 9 9 8 ▁and ▁ 1 9 9 9 , ▁respectively . ▁Each ▁of ▁these ▁react ors ▁has ▁a ▁capacity ▁of ▁ 7 0 0   MW . ▁Wol se ong ▁N uc lear ▁Plant ▁has ▁since ▁operated ▁successfully . ▁ ▁Wol se ong ▁N uc lear ▁Power ▁Plant ▁supplies ▁about ▁ 5 % ▁of ▁South ▁Korea ' s ▁electric ity . ▁ ▁Shin - W ols ong ▁N uc lear ▁Power ▁Plant ▁Shin - W ols ong ▁No . ▁ 1 ▁and ▁No . ▁ 2 , ▁are ▁two ▁new ▁OP R - 1 0 0 0 ▁type ▁press ur ized ▁water ▁react ors . ▁Shin - W ols ong ▁ 1 ▁became ▁fully ▁oper ational ▁in ▁July ▁ 2 0 1 2 . ▁ ▁In ▁June ▁ 2 0 1 3 ▁Shin - W ols ong ▁ 1 ▁was ▁shut down , ▁and ▁Shin - W ols ong ▁ 2 ▁ordered ▁to ▁remain ▁off line , ▁until ▁safety - related ▁control ▁cab ling ▁with ▁for ged ▁safety ▁certific ates ▁is ▁replaced . ▁Shin ▁W ols