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 Ukraine wird zum Strahlungsrisiko infographic
Grafik zeigt den von den Sowjets gebauten Saporischschja VVER-1000/320 Atomreaktor.


Ukraine vor Atomstrahlungsrisiko

By Duncan Mil

August 26, 2022 - Das Saporischschja Atomkraftwerk musste Diesel-Notstromaggregateeinsetzen, nachdem durch russischen Beschuß der Strom abgeschaltet worden war, wodurch das wichtige Kühlwasser nicht mehr durch den Reaktorkern gepumpt werden konnte.

The last of its four 750 kilovolt power lines supplying the Russian-held nuclear power plant was briefly cut on Thursday (August 25, 2022), triggering emergency protection systems and backup power for the first time.

“A secure off-site power supply from the grid is essential for ensuring nuclear safety,” IAEA Director General Rafael Mariano Grossi said in a statement.

“Almost every day there is a new incident at or near the Zaporizhzhya Nuclear Power Plant. We can’t afford to lose any more time. I’m determined to personally lead an IAEA mission to the plant in the next few days to help stabilise the nuclear safety and security situation there,” said Grossi.

In all nuclear power plants, the fission of atomic fuel gives off tremendous amounts of heat used to produce steam to power turbines that generate electricity.

All six Soviet-designed VVER-1000/320 pressurised water reactors at Zaporizhya have a primary cooling circuit in which electrical pumps push water through the reactor core. Maintaining power supply is crucial to those critical support systems.

“If the cooling is interrupted, the fuel can melt through the steel reactor vessel and -- in the most severe situation -- the containment structure can leak or rupture, releasing fission products to the environment,” Edwin Lyman of the U.S.-based Union of Concerned Scientists, said in a blog post.

That cooling process is vital to prevent a runaway chain reaction that would overheat and, in the worst case, cause a meltdown like those at Chernobyl or Fukushima.

PUBLISHED: 26/08/2022; STORY: Graphic News