WASHINGTON - Modernizing and maintaining the U.S. nuclear arsenal over the next 30 years will cost more than $1.2 trillion, according to a report released on Tuesday by the Congressional Budget Office.

The report said current plans for the modernization of the aging planes, ships and missile silos that make up the U.S. nuclear arsenal would cost 50 per cent more than if the U.S. only operated and maintained its current equipment in the field.