How many nuclear power plants in the north east of Honshu? I counted three.  The importance is that the area continues to get hit with quakes, and small tsunamis.

Miyagi Prefecture has one nuclear plant, Onagawa, with three reactors.

Fukushima Prefecture has two pants, Daiichi & DaiNi. Daiichi has six reactors, DaiNi has four reactors. Daiichi is the plant that is about to make Chernobyl look good.

Aomori Prefecture had a nuclear plant under construction, but Tokyo Electric ceased construction because of the disaster at Daiichi.

Tokyo Electric Power Company runs the Fukushima plants.  Oganawa is run by Tohoku Electric Power Company.  Both could be called TEPCo, but they are different companies.