Comment by ikr678
14 hours ago
Off the top of my head: Ocean levels of salt in a water system are much more expensive to maintain (even the secondary loop).
Coastal land much more expensive. If you go to a remote coastal site, you probably won't have as good access to power.
Coastal sites usually exposed to more severe weather events.
Other fun unpredicatble things eg-Diablo Canyon nuclear facility has had issues with debris and jellyfish migration blocking their saltwater cooling intake.
https://www.nbcnews.com/news/world/diablo-canyon-nuclear-pla...
And oysters / mussels / clams / every other creature that starts small and turns calcium into brick finds your cooling system to be a delightful place to raise a family, especially in delicate heat exchangers with small easily blockable passages.