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.