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The nuclear power station in the eye the Ukraine war

Donald Trump, the U.S. president, said that he will speak with Vladimir Putin of Russia on Tuesday to discuss ending the Ukraine conflict. The question of who controls the Zaporizhzhia Nuclear Power Plant is likely to play a major role in the discussions.

Russia and Ukraine accuse each other of drone attacks and military activity around Zaporizhzhia - Europe's biggest nuclear plant - and the International Atomic Energy Agency (IAEA) has warned about the dangers of a catastrophe there for years.

The plant is located 500 kilometers (300 miles), away from the site where the 1986 Chornobyl nuclear disaster, which was the worst nuclear accident in history, occurred. In February,

a drone caused significant damage

The structure designed to prevent any radioactive leakage from the damaged reactor at Chornobyl. In February, the IAEA blamed military activities for the cancellation of the rotation of a Zaporizhzhia Plant monitoring mission. It did not assign responsibility. A drone hit an IAEA vehicle on the way to the plant in December.

What is the nuclear material at the Zaporizhzhia Plant, what are its risks, and why are Russia & Ukraine fighting about it?

WHAT IS IT? WHAT WAS THE CAPACITY OF THIS SYSTEM?

Six VVER-1000 V320 water-cooled, water-moderated Soviet VVER-1000 V320 reactors contain Uranium-235. All six were built in 1980, but the sixth was only brought online in mid-1990s following the collapse of Soviet Union.

The reactors have all been put into cold shutdown.

IAEA Director-General Rafael Grossi said that fighting a conflict around a nuclear power plant puts nuclear safety and security "in constant jeopardy".

What are the risks?

Russian forces took over the plant early in March 2022, just weeks after they invaded Ukraine. Special Russian military units protect the facility, and Rosatom, the state-owned nuclear company of Russia, operates the plant.

The containment structures of nuclear reactors like Zaporizhzhia are constructed of reinforced concrete with steel linings designed to withstand a small aircraft crash. Therefore, a minor attack is unlikely to pose a serious threat.

In a 1989 study, the U.S. Department of Energy concluded that the containment dome used in Zaporizhzia was "vulnerable to the effects of aircraft crashes". A fighter jet could crash downwards, into the dome's thinner structure, and cause concrete chunks or aircraft engine parts to be thrown inside. The external power lines that are essential for cooling the nuclear fuel inside reactors can be a soft target. Even in reactors that are in cold shutdown, cooling fuel is essential to avoid a nuclear meltdown.

Since the beginning of the war, the plant has been forced to use emergency diesel generators several times. Also, water is needed to cool the fuel.

Even when the reactors are turned off, pressurised water can be used to remove heat from them. Pumped water is also used for cooling spent nuclear fuel removed from the reactors.

The zirconium coating could explode if there is not enough water or the power to pump it.

What happens to the spent fuel?

There are also spent fuel pools and a dry storage facility for spent nuclear fuel at each site. These pools are used to cool the used nuclear material.

The pools will dry up and heat up without water, increasing the risk of a fire. This could lead to the release of radioactive isotopes. A hydrogen leak from a spent-fuel pool was responsible for an explosion in reactor 4 of Japan's Fukushima Nuclear Disaster in 2011.

WHAT HAPPENS DURING A MELTDOWN? A fire or explosion could be caused by a meltdown, releasing a plume radionuclides in the air. This could spread to a wide area. The Chornobyl disaster spread Iodine 131, Caesium 134, Strontium 90 and Caesium 137 over parts of northern Ukraine and Belarus, Russia and northern and central Europe.

According to the United Nations, nearly 8.4 million people were exposed to radiation in Belarus, Russia, and Ukraine. The disaster is directly responsible for around 50 deaths.

However, 600,000 "liquidators" involved in firefighting or clean-up operations were exposed to high levels of radiation. Resettlement was undertaken for hundreds of thousands. The health effects of the Chornobyl accident were much worse than originally thought at the time, and even in the years that followed the accident.

The incidence of thyroid cancer among children in Belarus, Russia, and Ukraine has increased since the accident. Children in the contaminated area had a higher incidence of respiratory and endocrine diseases, as well as anaemia. (Reporting and editing by Alex Richardson; Bureaus reporting)

(source: Reuters)