Not really. Reaction change when moving the rods is almost instantaneous. Random spikes in grid usage are not that random and any competent power providers can predict and plan accordingly. The only real concern is decay heat things like xenon build up down the road, again something the industry can predict and plan around as standard practice and western built reactors have safety systems built around preventing those factors from becoming serious issues.
Not really. Reaction change when moving the rods is almost instantaneous. Random spikes in grid usage are not that random and any competent power providers can predict and plan accordingly. The only real concern is decay heat things like xenon build up down the road, again something the industry can predict and plan around as standard practice and western built reactors have safety systems built around preventing those factors from becoming serious issues.