'Let's hope cooler heads prevail.'
that the fire was extinguished around 6:20 a.m. local time after burning for nearly five hours.
As the situation on the ground unfolds, there are four major issues to keep in mind about the risks facing Ukraine's nuclear sites in the midst of a war:Water-cooled nuclear power plants such as the reactors at Zaporizhzhia utilize the intense heat produced by the fission of nuclear fuel to convert water into steam, which then spins turbines to generate electricity. Under normal operation, electrically powered cooling systems remove the heat by pumping water through the reactor core.
The Ukrainian plants' spent fuel cooling pools are adjacent to the reactor vessel in the containment building, but they are smaller than pools at U.S. plants.There are a number of events that could trigger a worst-case scenario involving a reactor core or spent fuel pool located in a war zone: An accidental—or intentional—strike could directly damage one or more reactors. An upstream dam failure could flood a reactor downstream. A fire could disable plant electrical systems.
While redundant safety systems are necessary, they are not sufficient. There is always a risk of"common-mode" failures that affect all redundant equipment in the same way, so plants also need diverse backup systems. At Zaporizhzhia, there are additional options for restoring power, including connections to local hydroelectric plants and a thermal power plant.
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