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Three reactors shut down by jellyfish at French nuclear plant

Three reactors shut down by jellyfish at French nuclear plant
Three reactors shut down by jellyfish at French nuclear plant

Operator EDF reported that three reactors were shut down at France's Gravelines nuclear power plant late Monday night due to an enormous swarm. This triggered preventative measures implemented last year, after the entire facility went offline.

The plant is located in northern France and is the largest of its kind in the country. It is cooled by a canal that connects to the North Sea. The six units produce 900 Megawatts each or 5.4 Gigawatts total.

Due to the swarm, reactors 2, 3, and 4 have been taken offline. Reactor 1 has also had its output limited to 50% as a precaution. EDF reported that reactor 5 had been 'already taken offline for maintenance' and reactor 6 was still fully operational.

The operator implemented new monitoring?and trawling methods to try to avoid or limit future events.

Engineers at EDF have installed fixed cameras in the intake?canals, on the filter drum screens and the intake?canals to detect any blockages as quickly as possible.

The engineer explained that the company also has partnered with two French fishing organisations and one sea rescue organization, who monitor for swarms. They can then raise an alarm to allow fishermen to conduct targeted trawling to reduce swarm density before they reach the plant.

After an initial alert was raised on Saturday, the?fishing boat were deployed to limit the impact of the swarm. He said that vacuum trucks are used to remove the jellyfish already present on the site.

They added that since no new jellyfish have arrived, the cleanup has been completed, and should lead to a "quick restart" of the units.

EDF stated that the situation has no impact on the safety or environment of the facility. Scientists warn that such events may become more frequent due to factors like global warming, the arrival and spread of invasive species as well as habitat loss for predators. EDF also has heat-limited reactors across the country as a 5th heatwave?is expected to continue throughout the week, and?limit French nuclear output.

A reactor in the North has been off-line for the majority of the summer because of low river levels. Another reactor has only had a few restarts, and has remained mostly offline for the bulk of July.

(source: Reuters)