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Chornobyl Nuclear Plant: Facts and figures

The Chornobyl Nuclear Power Plant in Ukraine, where Ukraine accuses Russia of hitting a radiation-containment structure on Friday is a defunct plant in Ukraine that was the site in April 1986 of the worst civil nuclear disaster in the history of mankind.

Here are some facts and figures about the plant.

The Soviet engineers who were operating the plant at the time of the explosion on April 26, 1986 made a human error.

According to a United Nations' report, facility operators had violated safety regulations by turning off critical control systems in the Ukrainian plant’s reactor number 4. This allowed it to reach low-power, unstable conditions.

At 1:24 am (2324 GMT), a power surge caused a series blasts that blew the heavy concrete and steel lid off the reactor. A cloud of radioactive dust was sent billowing over northern and western Europe and even reached the east coast of the United States.

DEATHS and DAMAGE

The explosion of reactor number four at the plant released a large amount of radiation.

According to the International Atomic Energy Agency, the disaster affected an area of 150 000 square kilometers in Ukraine, Belarus, and Russia. Around the site, a 30-km-wide exclusion zone has been established.

Chernobyl forum, an association of eight U.N. agencies and the governments in Ukraine, Belarus, and Russia have estimated that several thousand people died as a direct result of the explosion. U.N. agencies estimate that 4,000 people are expected to die as a result of radiation exposure.

Greenpeace, an environmental group, estimates that the final death toll will be higher than official estimates. Up to 93,000 additional cancer deaths are expected worldwide.

CONTAINMENT

The Soviet Union constructed a structure to contain the radiation from the large quantities of uranium that were still in the reactor.

In the years that followed, international concern grew about whether or not the original structure was fit for purpose.

Bechtel, an American engineering firm, said that the sarcophagus had many gaps and was not securely attached to the structure. This left the enclosure susceptible to leakage of rainwater, settlement, and earthquakes.

The New Safe Confinement Structure, which is a huge steel and concrete arch built over the old Soviet structure, was funded by 45 countries and donors.

In December 2000, engineers shut down the third and last reactor of Chornobyl.

In 2019, the structure was completed and officially handed over to Ukraine's government. President Volodymyr Zelenskiy attended the ceremony.

(source: Reuters)