(1) The river is flooding a bit
(2) The material used to keep the flood away from dangerous radioactive goo (tm) has partially failed
(3) No one is in the least concerned about the river flooding enough to actually get at the dangerous radioactive goo
(4) The news needed something to report on that might cause public concern and attention to their channel
(5) Stating that there was no concern about the river getting at the radioactive goo will immediately cause some people to be concerned that the river might get at the radioactive goo
(6) If the river somehow magically got at the radioactive goo, the river would become somewhat radioactive but though a lot of problems might result for local waterlife, it would all wash out in the end.
HOLY MACRO!