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(chĭrnō`byēl), Ukr. Chornobyl, abandoned city, N Ukraine, near the Belarus border, on the Pripyat River. Ten miles (16 km) to the north, in the town of Pripyat, is the Chernobyl nuclear power station, site of the worst nuclear reactor disaster in history. On Apr. 25, 1986, during an unauthorized test of one of the plant's four reactors, engineers initiated an uncontrolled chain reaction in the core of the reactor after disabling emergency backup systems. On Apr. 26, an explosion ripped the top off the containment building, expelling radioactive material into the atmosphere; more was released in the subsequent fire. Only after Swedish instruments detected fallout from the explosion did Soviet authorities admit that an accident had occurred. The reactor core was sealed off by air-dropping a cement mixture, but not before eight tons of radioactive material had escaped. Subsequently, the damaged reactor building was enclosed in a concrete and steel "sacrophagus," a massive structure that was constructed around it.

Twenty firefighters died immediately from overexposure to radioactivity, while hundreds suffered from severe radiation sickness. Pripyat, Chernobyl, and nearby towns were evacuated. People who lived near the plant in Ukraine and Belarus at the time have seen a greatly increased incidence of thyroid cancer, and genetic mutations have been discovered in children later born to exposed parents. Nearly all thyroid cancer cases, however, were successfully treated. Ukraine has estimated that some 4,400 people died as a result of the accident and during its cleanup, but a 2005 report prepared by several UN agencies and regional governments indicated that some 50 deaths were directly attributable to radiation from the disaster and an estimated 4,000 deaths might ultimately result from it, mainly due to higher cancer rates. That prediction was challenged the following year by a Greenpeace report that said more than 90,000 deaths might result, roughly half of which would be due to conditions other than cancer. The agricultural economies of E and N Europe were temporarily devastated, as farm products were contaminated by fallout. One Chernobyl reactor remained in operation until Dec., 2000, when the complex was shut down.

An exclusion zone encompassing the areas of highest radiation and including some 1,000 sq mi (2,600 sq km) was ultimately established, but many population centers outside the area were also abandoned. More than 90,000 people were relocated, though a few illegally returned. Wildlife in the area, however, has reestablished itself, flourishing to some degree in the absence of human activity. In 2016 a new confinement structure was placed over the entombed reactor.


See S. Alexievich, Voices from Chernobyl (2005).



a city (since 1841) and administrative center of Chernobyl’ Raion, Kiev Oblast, Ukrainian SSR. Situated on the Pripiat’ River, 18 km from the Ianov railroad station on the Chernigov-Ovruch line. Chernobyl’, a river landing, has an iron foundry, a cheese plant, a ship-repair dock, and a workshop of an artistic production association. The city has a medical school.


a town in N Ukraine; site of a nuclear power station accident in 1986
References in periodicals archive ?
EKOR was certified for use by the Ukrainian government in August after an initial application of the composite at Chernobyl's failed reactor 4 proved that EKOR is radiation resistant, does not degrade even after long-term exposure to radiation, and can withstand extreme physical, chemical and biological assaults on its structural integrity.
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In 2000, EKOR was successfully demonstrated to contain radiation from Chernobyl's Unit Four.
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AMEX: EUO), announced today that new EKOR applications were successfully applied at the site of Chernobyl's reactor accident to address additional critical problems resulting from the nuclear reactor failure - radioactive dust suppression and decontamination of the surfaces.
The State Department and the interagency task force both noted early this week that the raging graphite fire at Chernobyl's unit-4 reactor, detected in aerial photos last week, may still be burning.
At a recent United Nations Conference, Ukrainian Deputy Director of the Chernobyl Shelter Project, Artur Korneev, presented information about EKOR(TM)'s success in encapsulating critical fuel masses inside Chernobyl's sarcophagus in March 2000, and EKOR(TM)'s potential applications in nuclear waste management worldwide.
AMEX:EUO) announced that EKOR, a revolutionary geopolymer composite used to "cocoon" nuclear waste and prevent radioactive contaminants from dusting or seeping into the environment, continues to perform nine months after being applied on a fuel containing mass inside Chernobyl's failed reactor No.
Assessment of EKOR leading to certification was done by the Ukrainian Government following successful application of the composite at Chernobyl's failed reactor 4 in March of this year.
At the request of Chernobyl's Shelter Project management, EUROTECH's aggressive schedule to make the first application several weeks ago into the high radiation area below the failed reactor, was adjusted to incorporate the use of robotics and do an application of EKOR on a mock pile of fuel-containing mass.
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