EUROPE'S biggest nuclear power plant was disconnected from the power grid for the first time ever amid fears of a Chernobyl-style disaster, Ukraine's state energy firm said.
Nuclear agency Energoatom said fire damage to overhead power lines caused the last two reactors at the Zaporizhzhia Nuclear Power Plant (ZNPP) to be cut off.
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An energy official who declined to be identified told Reuters that the two reactors that had been disconnected were being powered by diesel generators.
Each power unit that includes a reactor, a cooling system and other equipment has three Soviet-era diesel generators that "are not able to work for weeks", the source said.
It comes amid looming fears the site could be the scene of a devastating nuclear disaster as both Ukraine and Russia accuse each other of putting the plant at risk.
Satellite images show Putin's forces massing at the site amid growing calls for Zaporizhzhia to become a demilitarised zone.
Ukraine has accused Russia of torturing Ukrainian nuclear workers at the plant, further compromising safety at the plant.
Energoatom said the plant has now been disconnected from the network for the "first time in its history" after a fire at ash pits close to the facility damaged incoming power lines.
It is also reported communication channels around the plant have gone dark - with NetBlocks reporting a massive dip in the region.
Bringing the plant totally offline could potentially compromise safety systems and lead to disaster - with the two reactors currently being powered by backup diesel generators, officials told Reuters.
And it is feared if the plant becomes totally isolated from the power grid and its backup generator then fails it could go into meltdown.
Russia, which invaded Ukraine in February, captured the Zaporizhzhia plant in March and has controlled it since, although it continues to be operated by Ukrainian technicians from Energoatom.
Putin's forces have been accused of planning to totally disconnect the facility from Ukraine's power grid and send the energy back to Russia.
On Thursday, the US condemned any Russian bid to divert energy from Ukraine.
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"The electricity that it produces rightly belongs to Ukraine and any attempt to disconnect the plant from the Ukrainian power grid and redirect to occupied areas is unacceptable," State Department spokesman Vedant Patel said.
Ukraine has regularly accused Russia of "nuclear blackmail" over the site.
It is feared disconnecting the plant entirely would leave the ZNPP dependent on a single source of electricity to cool the reactors.
And an uncooled reactor could lead to a catastrophic failure and a nuclear disaster.
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Switching between the Ukrainian and Russian power grids would leave the reactor only reliant on a backup diesel generator - with no other options if it suffered a failure.
Russia is probably prepared to exploit any Ukrainian military activity near [Zaporizhzhia] for propaganda purposes
Ministry of Defence
After only 90 minutes without power, the reactors would reach a dangerous temperature.
"During this disconnection, the plant won’t be connected to any power supply and that is the reason for the danger," Energoatom chief Petro Kotin told The Guardian.
"If you fail to provide cooling … for one hour and a half, then you will have melting already."
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Each power unit that includes a reactor, a cooling system and other equipment has three Soviet-era diesel generators that officials warned "are not able to work for weeks".
Chernobyl nuclear power plant in the north of the country exploded and went into meltdown while under Soviet control back in 1986.
It sent a radiation plume into the atmosphere which spread across the world and rendered huge swathes of Ukraine completely uninhabitable as they remain dangerously radioactive.
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Kyiv has never forgotten the lessons learned from the disaster - which may have led to the early deaths of up to 60,000 people worldwide.
Neighbouring towns around ZNPP such as Kherson, Melitopol, and Enerhodar were reportedly left without power as the situation around the plant sits on a knife edge.