You are a nuclear power plant operator working at the Rasvyat Nuclear Power Station. You and up to 5 other players operate the historic RBMK-1000 reactor, after learning how to operate it, you and your fellow operators must start up the reactor and keep it stable, along the way you may face various issues and have to preform various tasks.
Once started you must keep the reactor online for as long as possible, however various events can occur, including various system malfunctions, power outages, earthquakes and more.
Every action made by you and your fellow operators has an effect, even a decision made for convenience or something done an hour ago could eventually cause a problem, any mistake threatens the reactor, risking damage to equipment or even a reactor meltdown.