A nuclear plant in northern France shut down three reactors after a swarm of jellyfish clogged pumps used to cool the units, energy group EDF said on Tuesday.Three reactors were taken offline on Monday and output at a fourth was cut by half, EDF said in a statement, leaving just one operating at full capacity.A sixth reactor was already offline for scheduled maintenance.“This situation has no impact on the safety of the facilities, the safety of personnel, or the environment,” EDF...