The Chernobyl disaster (Ukrainian: Чорнобильська катастрофа, Chornobylska Katastrofa – Chornobyl Catastrophe) was a nuclear accident that occurred on 26 April 1986 at the Chernobyl Nuclear Power Plant in Ukraine (then officially Ukrainian SSR). An explosion and fire released large quantities of radioactive contamination into the atmosphere, which spread over much of Western USSR and Europe. It is one of only two classified as a level 7 event on the International Nuclear Event Scale (the other being the Fukushima Daiichi nuclear disaster in 2011).
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- The risk projections suggest that by now  Chernobyl may have caused about 1000 cases of thyroid cancer and 4000 cases of other cancers in Europe, representing about 0.01% of all incident cancers since the accident. Models predict that by 2065 about 16,000 cases of thyroid cancer and 25,000 cases of other cancers may be expected due to radiation from the accident, whereas several hundred million cancer cases are expected from other causes.
- Cardis, Elisabeth; Krewski, Daniel; Boniol, Mathieu; Drozdovitch, Vladimir; Darby, Sarah C.; Gilbert, Ethel S.; Akiba, Suminori; Benichou, Jacques; Ferlay, Jacques; Gandini, Sara; Hill, Catherine; Howe, Geoffrey; Kesminiene, Ausrele; Moser, Mirjana; Sanchez, Marie; Storm, Hans; Voisin, Laurent; Boyle, Peter (2006). "Estimates of the cancer burden in Europe from radioactive fallout from the Chernobyl accident". International Journal of Cancer. 119 (6): 1224. doi:10.1002/ijc.22037. PMID 16628547.
- For the attention of the residents of Pripyat! The City Council informs you that due to the accident at Chernobyl Power Station in the city of Pripyat the radioactive conditions in the vicinity are deteriorating. The Communist Party, its officials and the armed forces are taking necessary steps to combat this. Nevertheless, with the view to keep people as safe and healthy as possible, the children being top priority, we need to temporarily evacuate the citizens in the nearest towns of Kiev region. For these reasons, starting from April 27, 1986 2 pm each apartment block will be able to have a bus at its disposal, supervised by the police and the city officials. It is highly advisable to take your documents, some vital personal belongings and a certain amount of food, just in case, with you. The senior executives of public and industrial facilities of the city has decided on the list of employees needed to stay in Pripyat to maintain these facilities in a good working order. All the houses will be guarded by the police during the evacuation period. Comrades, leaving your residences temporarily please make sure you have turned off the lights, electrical equipment and water and shut the windows. Please keep calm and orderly in the process of this short-term evacuation.
- Evacuation announcement in Pripyat, 27 April 1986 (14:00)
- The developers of the reactor plant considered this combination of events to be impossible and therefore did not allow for the creation of emergency protection systems capable of preventing the combination of events that led to the crisis, namely the intentional disabling of emergency protection equipment plus the violation of operating procedures. Thus the primary cause of the accident was the extremely improbable combination of rule infringement plus the operational routine allowed by the power station staff.
- "Expert report to the IAEA on the Chernobyl accident" (in Russian). 61. Atomic Energy. 1986.
- NARRATOR: In 1986, in what was the Soviet Republic of Ukraine, the Chernobyl nuclear reactor exploded, releasing 400 times more radioactive material than the Hiroshima Bomb. Thirty workers died; 50,000 people fled the nearest city, and the radioactive fallout spread over Europe. It was the world's worst nuclear accident.
Thirty years later, its hastily built enclosure is crumbling. In a race against time, engineers are struggling to prevent another catastrophic release of deadly radioactive debris into the environment.
- NARRATOR: In the vicinity of the reactor, the radioactive fallout forced a third-of-a-million people to evacuate, never to return.
It remains the world's worst-ever nuclear power plant disaster. It left the Soviet authorities with a monumental problem: around 200 tons of shattered uranium fuel rods and other radioactive debris remained inside the damaged reactor building. Left uncovered, it would continually release radioactive dust into the air, a poisonous cloud to threaten the surrounding area.
Over the next six months, workers braved extreme radiation to seal the reactor inside a 300,000-ton shelter, made from steel and concrete. It came to be called the "sarcophagus."
But it was flawed from the start. The extreme radiation prevented the workers from completing the welds needed to seal the prefabricated sections of the sarcophagus together.
- "Building Chernobyl's MegaTomb", NOVA, PBS, (April 26, 2017).
- We were just not prepared for that sort of situation.
- There has been an accident at the Chernobyl Nuclear Power Plant. One of the nuclear reactors was damaged. The effects of the accident are being remedied. Assistance has been provided for any affected people. An investigative commission has been set up.
- Vremya, 28 April 1986 (21:00)