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Hot weather hits Nordic nuclear production

Publisert 23.07.2014, sist oppdatert 05.09.2017

Global-sverige-verksamhet-energikallor-c3_ringhals_sjo2(Montel) Warm weather across Scandinavia has contributed to a reduction in nuclear power output in the region, Vattenfall told Montel on Tuesday. Foto. Vattenfall

”The drop in output is due to warmer cooling water, which results in a lower efficiency of our turbines,” said Mikael Petrovic Wågmark, spokesman at the Swedish utlity.

Output at the 12 reactors in operation in the region is currently around 700 MW below the installed capacity of just over 11,000 MW.

The seawater temperature at Vattenfall’s Ringhals and Forsmark plants is about 20C, Wågmark said.

However, output will only be seriously affected if the water reaches around 23C, he added.

”For every degree above that level, output will have to be reduced around 3%,” he said.

This is done in order to secure sufficient cooling of the reactor and to guarantee that the water released back into the ocean is not too warm.

Over the next five days a heatwave in the Nordic area will bring temperatures 5-6C above the norm of 16.7C, according to data from Swedish forecaster SMHI. Temperatures have been above average in the region since 4 July.

In addition to the warm weather, the fuel in some of the reactors is reaching the end of its cycle ahead of their annual maintenance, further reducing output, Wågmark said.

The next reactor to be stopped for its statutory outage is Forsmark 3, on Sunday.

Reporting by:

Anton Tigerstedt
14:06, Tuesday, 22 July 2014

Translating by:
Roger Fry
14:06, Tuesday, 22 July 2014

Editing by:
Jeff Coelho
14:06, Tuesday, 22 July 2014

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