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Jellyfish force partial shutdown of French nuclear plant

Created at 27 Aug · 3:06 PM1 source↑ Market-relevant
IN SHORT

A massive influx of jellyfish has led to the partial shutdown of two reactors at France's Gravelines nuclear power station. The jellyfish are clogging the seawater filtration system used for cooling.

Key Numbers

sixtotal nuclear reactors at Gravelines
tworeactors shut on Wednesday and Thursday
900 megawattspower output per unit
August 10date third unit shut down

Who's Involved

Électricité de France (EDF)
Operator of the Gravelines nuclear power station
Alys Davies
Getty Images contributor

↳ Why This Matters

The shutdown of nuclear reactors due to jellyfish highlights the vulnerability of energy infrastructure to environmental factors and the potential impact on power supply, particularly during periods of high energy demand or when other units are offline.

Key facts

  • Two reactors at France's Gravelines nuclear power station were shut down due to jellyfish.
  • The jellyfish are clogging the seawater filtration system used for cooling.
  • A third unit has been shut since August 10 for the same reason.
  • Units one and two are operating at reduced power as a precaution.
  • Gravelines is one of France's largest nuclear power stations, located between Dunkirk and Calais.

Two reactors at France's Gravelines nuclear power station have been partially shut down due to a massive influx of jellyfish clogging the seawater filtration system used for cooling. Électricité de France (EDF) stated that two units were shut on Wednesday and Thursday, with a third unit having been offline since August 10 for the same reason. A fourth unit is currently closed for inspection.

Units one and two are operating at reduced power as a preventative measure. Gravelines, situated between Dunkirk and Calais, is one of the country's largest nuclear power stations. The plant experienced a similar issue last August. Each of Gravelines' six units produces 900 megawatts of power and is cooled by seawater drawn from a canal connected to the North Sea.

Experts note that jellyfish are more active in warmer months when increased plankton levels draw them closer to the surface. Measures to mitigate jellyfish infiltration include a partnership with fishermen who relocate them further offshore. Similar incidents have occurred at other nuclear facilities, though they are considered rare.

Frequently asked questions

Jellyfish are clogging the seawater filtration systems that are essential for cooling the nuclear reactors. This influx can disrupt operations and necessitate shutdowns to prevent damage or overheating.

While not extremely common, similar incidents have occurred at other nuclear stations globally, such as in Scotland and Sweden. Jellyfish blooms are often linked to warmer water temperatures.

The Gravelines nuclear power station has six reactors, each capable of producing 900 megawatts of power.

What Happens Next

01EDF will continue to monitor jellyfish levels and manage filtration systems.
02Units one and two will operate at reduced power until the issue is resolved.
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How It Developed

Two reactors at the Gravelines nuclear power station were shut down on Wednesday and Thursday.
A third unit had been shut since August 10 due to jellyfish.
A fourth unit is closed for inspection.
Units one and two are operating at reduced power.
The station is cooled by seawater from a canal connected to the North Sea.

Sources

T1
Jellyfish force partial shutdown of French nuclear plantBBC News

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