<span style="color: #222222;">Russia's nuclear power company today said that a Soviet-built nuclear reactor has been shut down after 45 years of service.</span><br />'' <br />'' <span style="color: #222222;">The state-controlled Rosatom Corporation said that Reactor No. 1 at the Leningrad nuclear power plant has been taken out of operation as planned. It said it will take until 2023 to fully unload its uranium fuel.</span><br />'' <span style="color: #222222;"> </span><br />'' <span style="color: #222222;">Launched in 1973, the reactor became the first unit of the RBMK-1000 type to be built in the Soviet Union. A reactor of the same type exploded in Chernobyl in April 1986 in the world's worst nuclear accident.    </span><br />'' <span style="color: #222222;"> </span><br />'' <span style="color: #222222;">The Leningrad power plant has three other Soviet-built reactors of the same type.</span>