The Ukrainian operators of the Zaporizhzhia nuclear power plant have shut
down the last operating reactor there, as a safety measure.
Is this actually an improvement in safety? I have doubts.
While one reactor was operating, the plant had three options for
obtaining the electricity needed to prevent meltdowns in the shut-down
reactors: electricity generated by the one operating reactor,
electricity obtained by cable from a distance, and the diesel backup
generators.
With all reactors shut down, the first option is gone, and the other
two are no more reliable than before.