Forty years after the Chernobyl meltdown, too many people are still drawing the wrong conclusions.

The world's worst nuclear disaster began 40 years ago at 1:23 a.m. on April 26, 1986, when Unit 4 at the Chernobyl nuclear power generation facility experienced an explosion and meltdown. Ironically, the explosion was caused by a botched safety test.

The point of the test had been to see what would happen if the power plant lost its main electrical supply: Could spinning turbines generate enough power to run the coolant pumps until emergency backup diesel generators could kick in? The experiment had failed three times previously, but never as catastrophically as it did that night.

Before the meltdown, Soviet officials had bragged regularly about the safety of their nuclear power plants and disparaged those in the West. In 1983, state-sponsored news agency Novosti reported that Soviet scientists had estimated the probability of a nuclear accident involving a radioactive discharge at one in 1 million. In 1984, Minister of Power and Electrification Petr Neporozhny called the country's nuclear plants "totally safe." Just two months before the disaster, the English-language propaganda magazine Soviet Life claimed: "Even if the incredible should happen, the automatic control and safety systems would shut down the reactor in a matter of seconds. The plant has emergency core cooling systems and many other technological safety designs and systems."

Soviet officials initially tried to hide the disaster, but it was detected in the West two days later when an employee's contaminated shoes triggered radiation alarms at Sweden's Forsmark Nuclear Power Plant. The Swedes at first feared that their own plant was leaking radiation, but they soon traced the issue back to Chernobyl by analyzing wind patterns and specific radioactive isotopes.

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