The spending is part of the fiscal year 2018 omnibus appropriations law.
Nuclear spending may threaten funding needed for non-nuclear defense programs.
Analysis of budget figures released by the Pentagon suggest that the total 30-year cost could approach and perhaps even exceed $1.5 trillion when including the effects of inflation. This is 50 percent more than the commonly cited estimate of roughly $1 trillion.
The House and Senate Armed Services Committee are currently considering defense authorization legislation that if passed into law would deal a major, if not mortal, blow to longstanding, bipartisan arms control efforts.
Nine Democratic senators are seeking to limit development funding for a nuclear-armed, air-launched cruise missile known as the long-range standoff (LRSO) weapon.
CBO’s 10-year cost estimate is $52 billion more than two years ago.
The budget office assesses options to cut billions of dollars in projected spending on the nuclear arsenal.