Government concerns and the public interest in Environental degradations over past half century were in focus as early as the 1960s and found reflections in numerous way, historically and politically, as well as from engineering and operational points of conduct. One example of these impacts upon Government is found in 1960s, Congress Joint Atomic Energy Committee Report focused upon the US Navy's push to develop nuclear power propulsion for US Navy warships, both surface and subsurface.
Part of the 1969 Atomic Energy Committee Hearings/Report consisted of this section in the attached image, focused upon problems and developments in ports from nuclear propulsion, results from US Navy nuclear powered ships.
The attached Table found in this Report at its culmination showed radiation effects upon ports and waters in these locations.
While the Report generally concluded operation and presence in ports was relatively safe, it shows both awareness and concerns by the US Navy for potential and actual degradations as result of nuclear powered ships in 1968-9.
[Ed. note: Hearings Before the Joint Committee on Atomic Energy, Congress of the United States, Ninety-First Congress, First Session on Naval Nuclear Propulsion Program, April 23, 1969 (Washington, D.C.: U.S. Govt. Print. Office, 1969), p. 195; a digital version of the report can be found here.]