Here are some interesting facts on the potential of nuclear desalination plants:
Assuming that the same efficiency as the BN350 [reactor] setup were achieved in a conventional regenerative steam distillation plant, such a two-reactor [8-9 GW thermal APWR and EPR] driven desalination plant could therefore deliver about one million cubic meters of water per day (over one quarter of a billion US gallons), as well as more than half a gigawatt of electricity - more than enough for all plant operations as well as activities like pumping water, operating equipment and other internal activities.Facts like these make me believe that we won't have serious water consumption problems in the future. If we run out of fresh water, the technology is already there for us to easily adapt to desalinating sea water.
To put this another way, since one acre-foot is equal to 1234 cubic meters, such a desalination plant could produce 810 acre-feet of water per day or about 283,500 acre-feet per year. What that equates to: Slightly less than half the water consumed by the entire city of Los Angeles.
Also worth noting, the proposed EPR unit at Calvert Cliffs, besides producing electricity, will be a desalination plant, though the water will only be used for plant purposes:
Unique to Unit 3 will be a desalination plant to produce potable water using reverse osmosis. The desalination plant will produce up to 1,250,000 gallon of potable water per day for Unit 3 and supporting facilities with total dissolved solids (TDS) less than 400 parts per million (ppm). The source for the desalination plant will be the brackish bay water from the makeup supply to the circulating water system. The TDS for the brackish bay water runs 10,000-15,000 ppm. The potable water will be distributed as makeup water for the demineralized water system, miscellaneous potable water services, fire protection and source water for the four ultimate heatsink cooling towers used during normal shutdown and power operation.