5 ms·Why can't they run the same water through the reactor again after the water cools?by emiliobumachar 10y agoWhy can't they run the same water through the reactor again after the water cools?nrki 10y agoBecause it's highly radioactive.gambiting 10y agoSo? It's not like it's any worse at cooling because of it. After all, nearly all nuclear reactors use highly irradiated water for cooling in the first cooling loop.wheelerwj 10y agoits not highly radioactive, its less radioactive than when it came out.