Inside Chernobyl: Day Two

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The Chernobyl disaster was a nuclear accident that occurred on 26 April 1986 at the No. 4 reactor in the Chernobyl Nuclear Power Plant, near the city of Pripyat in the north of the Ukrainian SSR in the Soviet Union. The initial emergency response, together with later decontamination of the environment, involved more than 500,000 personnel and cost an estimated $68 billion in 2019.

The accident occurred during a safety test meant to measure the ability of the steam turbine to power the emergency feedwater pumps of an RBMK-type nuclear reactor in the event of a simultaneous loss of external power and major coolant leak. During a planned decrease of reactor power in preparation for the test, the operators accidentally dropped power output to near-zero, due partially to xenon poisoning. While recovering from the power drop and stabilizing the reactor, the operators removed a number of control rods which exceeded limits set by the operating procedures. Upon test completion, the operators triggered a reactor shutdown. This resulted in rupture of fuel channels, leading to a rapid decrease in pressure which caused the coolant to flash to steam. This decreased neutron absorption, leading to an increase in reactor activity, which further increased coolant temperatures. This process resulted in steam explosions and melting of the reactor core.

The meltdown and explosions ruptured the reactor core and destroyed the reactor building. This was immediately followed by an open-air reactor core fire which lasted until 4 May 1986, during which airborne radioactive contaminants were released which were deposited onto other parts of the USSR and Europe. In response to the initial accident, a 10-kilometre (6.2 mi) radius exclusion zone was created 36 hours after the accident, from which approximately ~49,000 people were evacuated, primarily from Pripyat. The exclusion zone was later increased to 30 kilometers (19 mi) and additional people were evacuated.

Following the reactor explosion, which killed two engineers and severely burned two more, a massive emergency operation to put out the fire, stabilize the reactor, and clean up the ejected radioactive material began. During the immediate emergency response, 237 workers were hospitalized, of which 134 exhibited symptoms of acute radiation syndrome. Among those hospitalized, 28 died within the following three months, all of whom were hospitalized for ARS.

Following the disaster, Pripyat was replaced by the new purpose-built city of Slavutych. The USSR built the protective Chernobyl Nuclear Power Plant sarcophagus by December 1986. It reduced the spread of radioactive contamination from the wreckage and protected it from weathering. The confinement shelter also provided radiological protection for the crews of the undamaged reactors at the site, which were restarted in late 1986 and 1987. However, this containment structure was only intended to last for 30 years and required considerable reinforcement in the early 2000s. The Shelter was supplemented in 2017 by the Chernobyl New Safe Confinement which was constructed around the old structure. This larger enclosure aims to enable the removal of both the sarcophagus and the reactor debris while containing the radioactive materials inside. Clean-up was scheduled for completion by 2065.

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