Comment by sgarland

There was a similar problem with a specific generation of 688-class submarines, where a calculated temperature would slowly drift. The metric wasn’t used for any protective actions, so it wasn’t a “shut down immediately and return home surfaced on the diesel” situation, but still disconcerting.

I assume that after this the software was soak-tested for weeks / months to eliminate that class of bug. Naval Reactors is many things, but repeating the same mistake twice isn’t one of them.