The physics of a disaster
Twenty years ago, a fission reactor at Chernobyl, Ukraine, exploded, killing 28 people by radiation poisoning and ruining the health of thousands more by contaminating the water and soil.
By all accounts, the accident resulted from a poor reactor design and ill-advised operational decisions by the crew. It was the unforgiving laws of physics, however, that led to the worst nuclear power plant disaster in history.
Nuclear power plants generate electrical power by using pressurized steam to rotate turbine blades connected to electric generators. The heat of a controlled chain reaction creates the steam.
The trick is to control that chain reaction so that the nuclear core is hot enough to create the steam, but not hot enough to melt the reactor. Loss of that control caused the Chernobyl disaster.
Nuclear fission occurs when an atomic nucleus is too unstable to maintain its structural integrity. Basically, there’s too much energy in the tiny volume of the nucleus and the nucleus quells the riot by splitting into two smaller nuclei and emitting gamma ray photons. The process inevitably leads to an increase in temperature of the radioactive material.
Uranium is a naturally occurring “fuel” for fission reactors like the one in Chernobyl. Uranium has two principal isotopes, U-238 and U-235, which have different nuclear but identical chemical properties.
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