Updated 12/10/2020: In December 2016, the Navy released a force-structure goal that callsfor achieving and maintaining a fleet of 355 ships of certain types and numbers. The 355-shipgoal was made U.S. policy by Section 1025 of the FY2018 National Defense AuthorizationAct (H.R. 2810/P.L. 115- 91 of December 12, 2017). The Navy and the Department of Defense(DOD) have been working since 2019 to develop a successor for the 355-ship force-level goal.The new goal is expected to introduce a new, more distributed fleet architecture featuring asmaller proportion of larger ships, a larger proportion of smaller ships, and a new third tier oflarge unmanned vehicles (UVs). On December 9, 2020, the Trump Administration released a document that can beviewed as its vision for future Navy force structure and/or a draft version of the FY202230-year Navy shipbuilding plan. The document presents a Navy force-level goal that callsfor achieving by 2045 a Navy with a more distributed fleet architecture, 382 to 446 mannedships, and 143 to 242 large UVs. The Administration that takes office on January 20, 2021,is required by law to release the FY2022 30-year Navy shipbuilding plan in connection withDOD's proposed FY2022 budget, which will be submitted to Congress in 2021. In preparingthe FY2022 30-year shipbuilding plan, the Administration that takes office on January 20,2021, may choose to adopt, revise, or set aside the document that was released on December9, 2020. The Navy states that its original FY2021 budget submission requests the procurement ofeight new ships, but this figure includes LPD-31, an LPD-17 Flight II amphibious ship thatCongress procured (i.e., authorized and appropriated procurement funding for) in FY2020.Excluding this ship, the Navy's original FY2021 budget submission requests the procurementof seven new ships rather than eight. In late November 2020, the Trump Administrationreportedly decided to request the procurement of a second Virginia-class attack submarinein FY2021. CRS as of December 10, 2020, had not received any documentation from theAdministration detailing the exact changes to the Virginia-class program funding linesthat would result from this reported change. Pending the delivery of that information fromthe administration, this CRS report continues to use the Navy's original FY2021 budgetsubmission in its tables and narrative discussions.

Contents: (1) Intro. and Issue for Congress; (2) Background: Nuclear and Conventional Power for Ships; Nuclear Power for a Surface Combatant; Naval Nuclear Propulsion Program; Current Navy Nuclear-Powered Ships; CG(X) Cruiser Program; Reactor Plant for a Nuclear-Powered CG(X); Construction Shipyards; Nuclear-Capable Shipyards; Surface Combatant Shipyards; 2006 Navy Alternative Propulsion Study; (3) Potential Issues for Congress: Cost; Development and Design Cost; Procurement Cost; Operational Effectiveness; Ship Construction; Shipyards; Nuclear-Propulsion Component Manufacturers; Environmental Impact; (4) Potential Options for Congress; (5) Legislative Activity for FY 2010. Charts and tables.

The Navy has been procuring Virginia (SSN-774) class nuclear-powered attack submarines (SSNs) at a rate of one per year for the past several years, and a total of 11 boats have been procured through FY2009. This report discusses the Navy's proposed FY2010 budget, which requests $1,964.3 million in procurement funding to complete the procurement cost of a 12th Virginia-class boats.