National Cancer InstituteNational Institutes of Health
 
About the Accident
 
On April 26, 1986 an accident occurred at the Chornobyl nuclear power plant in Ukraine. The accident happened during a routine test, intended to demonstrate how long the turbines would spin after a power loss. Prior to the test the automatic shutdown mechanisms were disabled. Coolant water was reduced and the power output was increased. The operator tried to shut down the reactor but a flaw in the design caused a large power surge. An explosion caused radiation burns and exposure to the workers on site. The most adversely affected populations were emergency workers, children, and clean-up workers.
 
Existing Sarcophagus
Chornobyl At Present: The Existing Sarcophagus
 
The accident caused more than 28 short-term deaths from radiation burns and exposure. Four thousand cases of thyroid cancer, including 15 thyroid cancer deaths, resulted, as of 2005, with thousands more expected to develop among people who were children when the accident occurred. The accident resulted in the evacuation of around 360,000 people from contaminated regions of Belarus, Ukraine and Russia.

Those regions suffered significant economic damage and the area around the reactor is still quite desolate. The existing sarcophagus was constructed in a hurry as a temporary solution. It is now decaying and there exists a risk of radiation leakage. There is a new plan for enclosing the reactor, on top of the existing sarcophagus in order to contain the radiation. The plan, called the Shelter Implementation Program (SIP), will be completed in two phases - (1) Stabilization phase to structurally stabilize the existing sarcophagus and; (2) Building phase, in which the new safe confinement will be constructed off-site and slid on top of the existing structure to cover it.

 
Shelter Implementation Program
Construction Phase of Shelter Implementation Program
 
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