Interesting on the anti-freeze. I've worked with chillers in civilian life for years also till I retired and hadn't seen that one.
Hopefully then nobody tapped the wrong line for potable water though. I spend weeks in my spare time trying to track down our loop loss. Sometimes it would be stable for several days and sometimes several hundred gallons could disappear in a matter of minutes. I suspect EO Divisions heat exchangers may have had something to do with it. We had 2 guys TAD up there and they may have been opening a wrong valve. That added to some likely bad coils in the fan rooms.
On the sea water leak do you mean the de-sal plants or the chillers? Neither is good news but I can't understand sea water in the CW loop at all. That would take really bad piping configurations somewhere.
The sea water leak was in the main condensers, the ones that turned the left over propulsion steam back into freshwater to be fed back into the heat exchangers. The main condensers reside under the main engine steam turbines and a leak allows sea water to get mixed with the fresh water and pumped back into the steam cycle. Bad Ju-Ju!