Nuclear Weapons: NNSA Plans to Modernize Critical Depleted Uranium Capabilities and Improve Program Management, Report to the Committee on Armed Services, U.S. Senate [open pdf - 4MB]
From the Document: "High-purity DU [depleted uranium] is an important strategic material for ongoing and planned modernizations of the nation's nuclear weapons stockpile. However, according to NNSA [National Nuclear Security Administration] estimates, NNSA has a very limited supply of DU feedstock, and its current supply of DU metal will be exhausted in the late 2020s. NNSA also does not have the full range of capabilities needed to manufacture DU into weapon components needed for modernizing the stockpile. GAO [Government Accountability Office] has previously reported that NNSA has experienced challenges in restarting some technical manufacturing processes. A Senate committee report accompanying a bill for the National Defense Authorization Act for Fiscal Year 2017 included a provision for GAO to examine NNSA's management of DU for nuclear stockpile modernization. GAO's report examines (1) the status of NNSA's efforts to obtain the necessary quantities of DU to meet stockpile modernization requirements; (2) the status of NNSA efforts to develop DU component manufacturing capabilities to meet stockpile modernization requirements; and (3) the extent to which NNSA is managing DU activities as a program, consistent with agency policy."
Government Accountability Office: http://www.gao.gov/