A nuclear plant in northern France was temporarily shut down on Monday after a swarm of jellyfish clogged pumps used to cool the reactors, energy group EDF said.

The automatic shutdowns of four units "had no impact on the safety of the facilities, the safety of personnel, or the environment", EDF said on its website.

"These shutdowns are the result of the massive and unpredictable presence of jellyfish in the filter drums of the pumping stations," the Gravelines plant operator said.

The site was fully shut after the incident, with its two other units already offline for maintenance.

Teams were carrying out inspections to restart the production units "in complete safety", EDF said, adding the units were expected to restart on Thursday.

"There is no risk of a power shortage," the compan

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