Early History of CVAN Enterprise

Before the Beginning

The first nuclear carrier initiative was not Enterprise itself, but the earlier CVR project. CVR was planned as a shore-based prototype for a single shaft of a large naval vessel, such as an aircraft carrier. A later Joint Committee on Atomic Energy review described the project as having been based on a Joint Chiefs of Staff military requirement. It was to serve as a prototype for a large naval ship and, after completion, to produce power and plutonium.[1]

The project became vulnerable during the Eisenhower administration’s early effort to reduce federal spending. At a National Security Council meeting on 31 March 1953, Lewis Strauss suggested that eliminating the Air Force nuclear aircraft project and the Navy nuclear carrier would save more than $200 million annually.[2] The carrier project was especially exposed because relatively little money had yet been spent, and the Navy had not yet established an urgent requirement for an actual nuclear carrier hull. On 22 April 1953, the National Security Council, with President Eisenhower’s approval, eliminated the large-ship reactor project from the defense program.[3]

The cancellation did not end the underlying technology. Instead, Eisenhower indicated that he would consider converting the carrier-reactor effort into a civilian power project.[4] The Atomic Energy Commission subsequently redirected the pressurized-water reactor work into what became the Shippingport Atomic Power Station. On 16 June 1953, the AEC decided that the new pressurized-water reactor project would follow the carrier-reactor design and would be assigned to the Naval Reactors Branch.[5] The available sources do not provide enough detail to reconstruct the original CVR plant arrangement, reactor count, or carrier hull design. What can be stated with confidence is that CVR was a one-shaft shore prototype for a large naval vessel, associated with aircraft-carrier propulsion, and that it became the technical ancestor of Shippingport.

This episode is important because it shows that the first nuclear carrier effort was delayed for budgetary and policy reasons, not because the Navy or Naval Reactors had abandoned the idea. Shippingport also increased Rickover’s stature. It gave Naval Reactors experience in large pressurized-water reactor engineering, public nuclear power demonstration, utility interaction, industrial contracting, and safety discipline. By the time the Navy returned to a nuclear carrier later in the decade, Rickover’s organization had gained both technical experience and institutional credibility.

The Navy’s broader strategic interest in nuclear surface ships revived in the late 1950s. In January 1958, Admiral Arleigh Burke approved “The Navy of the 1970 Era,” a long-range study that envisioned a large fleet including six nuclear-powered carriers, twelve nuclear-powered guided-missile cruisers, and eighteen nuclear-powered guided-missile frigates.[6] This concept implied all-nuclear task forces built around a nuclear carrier, escorted by nuclear-powered cruisers and frigates.

The military logic was straightforward. A conventionally powered carrier required propulsion fuel and depended on replenishment ships. A nuclear carrier could steam at high sustained speed without consuming ship fuel, giving it greater operational reach, faster response, and less dependence on vulnerable logistics. For a carrier, this was not a marginal improvement. Speed and endurance affected flight operations, crisis response, repositioning, and survivability.

Enterprise Design Concept: Eight Reactors and the A2W Plant

Enterprise was designed with eight A2W pressurized-water reactors. The number reflected both the enormous power requirement of a large aircraft carrier and the state of reactor technology in the mid-1950s. Nuclear propulsion had already been demonstrated in submarines, but surface ships posed different problems. Carriers, cruisers, and frigates were much larger than submarines and required far greater shaft horsepower. Higher power introduced new problems in reactor physics, metallurgy, component design, shielding, and plant arrangement.[7]

Rickover’s method was to reduce risk through land-based prototypes. For submarines, that method had produced the S1W prototype for Nautilus. For the first nuclear carrier, Naval Reactors built the A1W prototype at the Atomic Energy Commission’s National Reactor Testing Station in Idaho. It was impractical to build a full eight-reactor carrier plant in the Idaho desert, so A1W consisted of two reactors and the associated steam equipment for one shaft.[8]

A1W served several purposes. It tested the engineering basis for the Enterprise plant, provided experience with carrier-scale nuclear propulsion, supported materials and component development, and generated data useful for the C1W plant used in USS Long Beach.[9] In later records, A1W is identified as the land prototype developed for Enterprise, located in Idaho, with two reactors reaching initial criticality on 21 October 1958 and 10 July 1959.[10] The first A1W reactor reached full power on 17 January 1959; the second reached full power on 4 September 1959; and both operated together at full power on 15 September 1959.[11]

The A2W plant installed in Enterprise was therefore not an untested paper design. It was supported by an operating prototype. That distinction was central to Rickover’s engineering philosophy. In his view, practical reactor plants were large, expensive, complicated, and dependent on detailed engineering; therefore, they required realistic testing before being entrusted to the fleet.

For the overall ship design, Enterprise was developed as the Navy’s SCB 160 design project, the formal Ship Characteristics Board project for the first nuclear-powered attack carrier. SCB 160 should be understood as the carrier design program, not as a reactor designation: the shipboard nuclear plant was the A2W plant, supported by the A1W land prototype at Idaho. [52]

Major Naval Reactors Contributors and Industrial Participants

Although Enterprise is often associated personally with Admiral Hyman G. Rickover, the program was the product of a broader Naval Reactors and industrial team.

The principal figure was Admiral Hyman G. Rickover, head of Naval Reactors in both the Navy and the Atomic Energy Commission. Rickover controlled the technical standards, contractor discipline, prototype philosophy, and political defense of the program. He also played a central role in congressional testimony and in the later campaign for additional nuclear-powered surface ships.

Milton Shaw (NRHQ 1950-1961) was one of the most important technical contributors. He handled nuclear propulsion for surface ships and was deeply involved in the A1W/Enterprise effort. In the catapult dispute, Shaw and Rickover argued that the carrier should not be made dependent on unproven internal-combustion or compressed-air catapults.[12] Shaw later led the November 1960 A1W demonstration for senior officers and civilians, showing that the plant could support demanding steam-catapult operations while the ship was at high power.[13]

David T. Leighton (NRHQ 1953-1980) succeeded Shaw as the Naval Reactors project officer for surface ships. During the March 1962 Joint Committee on Atomic Energy visit to Enterprise, Rickover and Leighton toured the committee through the ship and explained the propulsion plant’s performance and deficiencies record.[14]

At Newport News, Commander John W. Crawford, Jr. (NRHQ 1952-1963), Rickover’s Code 1500 representative, played an important role in imposing Naval Reactors’ management philosophy on the yard. In early 1958, as Enterprise and Shark entered construction, Rickover ordered Crawford to review the responsibilities of Newport News’s atomic power division with Rear Admiral Norborne L. Rawlings and other company officials. Crawford was to insist that the atomic power division control all nuclear-ship construction activities, including reactor-plant technical adequacy, design, procurement, planning, construction, testing, and liaison with both the Navy and reactor-plant contractors. Crawford also helped establish the yard’s nuclear quality-control organization by reviewing Richard S. Broad’s proposed responsibilities and forwarding them to Code 1500. The resulting mandate gave Broad authority over nuclear quality control, inspection, and health physics, including the power to halt work for violations. This episode illustrates Rickover’s method: field representatives such as Crawford were not passive observers, but instruments for forcing shipyards to accept direct, accountable responsibility for nuclear work.

At Bettis, Philip N. Ross, general manager of Bettis, and Ellis I. Cox, general manager for surface-ship projects, were important contributors to the continuing carrier-reactor development effort. Ross assigned the A1W core 3 project to Cox, a logical step because Cox was responsible for A1W and its related surface-ship work.[15] A1W core 3 later promised to make possible a four-reactor plant with about the same power as Enterprise’s eight-reactor plant.[16]

At Newport News, John I. Redpath III led engineering work on reactor-plant and steam-plant arrangements, electrical systems, and shielding for later surface-ship nuclear designs.[17] Newport News Shipbuilding and Dry Dock Company itself was the builder of Enterprise and had to adapt its yard facilities to accommodate the ship.

Other important figures in the broader political and operational history included Captain Vincent P. de Poix, the first commanding officer of Enterprise; Rear Admiral John T. Hayward, who later testified to the ship’s operational value; Chet Holifield, a leading congressional supporter; Senator John O. Pastore; Senator Henry M. Jackson; and AEC Chairman Glenn Seaborg. Their testimony and political support became essential when the Department of Defense resisted immediate follow-on nuclear carriers.

Budget and Cost Issues

Cost was one of the defining challenges of Enterprise. Nuclear propulsion promised major military advantages, but it came with higher up-front cost and greater technical complexity. Critics often focused on the acquisition cost of the nuclear ship rather than the operational value of endurance, speed, and reduced logistics.

The financial record shows the scale of the investment. From 1947 to 1963, AEC research and development costs included $267.4 million for surface-ship propulsion reactors and $155.4 million for Shippingport. AEC prototype construction costs included $34.8 million for A1W, the Enterprise prototype.[21] Navy-funded nuclear propulsion research, development, test, and evaluation from 1946 to 1963 included $67.1 million for surface-ship nuclear propulsion development.[22]

The ship itself experienced major cost growth. A 1960 Hubbard committee (led by Rear Admiral Miles H. Hubbard and commissioned by the CNO Admiral Burke) investigated the escalating cost of nuclear-powered surface ships. For Enterprise, the original estimate was $314 million, while the latest projected cost had risen to $472 million—an increase of a little over 1.5 times. The original estimate for the nuclear propulsion plant equipment was $90 million; the latest projected estimate was $133 million, also an increase of a little over 1.5 times.[23] The committee found that cost increases were not confined to nuclear propulsion; for both Enterprise and Long Beach, nearly every cost category increased, while the nuclear portion was not uniquely out of line.[24]

The broader carrier budget context was unfavorable. The Navy had been building the Forrestal class of conventional supercarriers, and those costs provided the comparison. USS Forrestal cost $218 million; USS Independence, the fourth ship of the class, cost $189 million. Against those figures, the Enterprise estimate of $314 million—possibly low even at the time—looked expensive.[25] The extra cost of nuclear propulsion became a major reason why the Eisenhower administration and later the Department of Defense hesitated to request follow-on nuclear carriers.

The Navy’s fiscal year 1960 carrier request was for a non-nuclear attack carrier (CVA-66 - America). Secretary of the Navy Thomas Gates acknowledged that nuclear propulsion offered the ability to steam great distances without refueling, but he argued that the advantage did not seem worth the extra $120 million.[26] This reflected the central argument against nuclear carriers: the carrier’s air wing and flight deck mattered most, and propulsion was treated as a means of getting the flight deck into position.

Rickover and his allies rejected that framing. They argued that propulsion determined how quickly the ship could get into position, how long it could remain there, how freely it could maneuver, and how little it depended on vulnerable fuel logistics. In March 1962, during congressional proceedings aboard Enterprise, Rickover stated that cost comparisons obscured the real issue: the military advantages of nuclear propulsion.[27]

The later CVA-67 controversy showed the same debate. By late 1962, Bettis had developed a four-reactor A3W plant with nearly the same power as Enterprise’s eight-reactor plant. The Bureau of Ships found that installing it in CVA-67 was technically feasible but would require extensive redesign. The estimated added cost was $113 million, including $32 million for an initial fuel loading expected to last about seven years.[28] The ship was ultimately built as the conventionally powered USS John F. Kennedy, but the debate helped establish the case for later nuclear carriers.

The Catapult Challenge

One of the most important engineering and programmatic challenges involved the aircraft catapults. By the early 1950s, the Navy had adopted steam catapults, but the Bureau of Aeronautics began developing an internal-combustion catapult that promised lower weight and reduced shock to aircraft.

A compressed-air catapult was also under development as a backup. The Bureau of Naval Weapons and Bureau of Ships initially agreed that Enterprise would receive the internal-combustion catapult.[29]

Rickover and Shaw objected. They believed the Navy was making one of its most important ships hostage to one untried development backed by another untried development.[30] The issue was not only catapult performance. It directly affected propulsion-plant design. If the ship used steam catapults, the nuclear steam plant had to provide large quantities of steam for flight operations in addition to propulsion.

On 26 October 1955, Rickover decided to design the plant to handle steam-catapult requirements despite assurances that this would not be necessary.[31] Two months later, the experimental internal-combustion catapult exploded at Lakehurst, New Jersey. In February 1956, Rickover won agreement that the Enterprise steam system would be designed so that the ship could use either steam or internal-combustion catapults.[32]

By July 1960, A1W tests demonstrated that the nuclear plant could more than meet steam-catapult requirements. The internal-combustion catapult was still failing to meet specifications, and the Bureau of Naval Weapons proposed substituting the compressed-air type. Time had become critical: Enterprise was launched on 24 September 1960, and two days later the Bureau of Naval Weapons and Bureau of Ships agreed to use steam catapults and set the steam requirements.[33]

On 10 November 1960, Shaw led a group of eighteen senior officers and civilians through the A1W facility. The plant was operated at several power levels, including ahead flank and astern full. A valve was installed to remove steam in the quantities and intervals required for sustained catapult operations during a maximum strike while the ship operated at full speed. The demonstration showed that the nuclear plant could more than meet the requirements of any postwar carrier then operating, under construction, or in design.[34]

To Rickover, the catapult fight illustrated a basic principle: never allow a critical ship to depend on another organization’s immature development project. If the internal-combustion or compressed-air catapult had failed, opponents might have blamed the nuclear propulsion plant. An inferior Enterprise, regardless of cause, would have strengthened opposition to nuclear carriers.[35]

Testing, Trials, and Early Performance

Testing occurred in stages: prototype testing at A1W, shipyard testing, preliminary acceptance trials, and early operational evaluation. The A1W prototype was central to risk reduction. It demonstrated full-power operation of the two-reactor, one-shaft carrier plant and later demonstrated steam-catapult support at demanding power levels.

Enterprise underwent sea trials before commissioning; later documentation identifies “Preliminary Acceptance Trials, Enterprise—CVA(N)65” in September 1961.[36] The ship then entered service and quickly became a platform for both operational evaluation and political demonstration.

On 31 March 1962, Enterprise left Guantánamo Bay with a Joint Committee on Atomic Energy delegation embarked. Rickover and David T. Leighton toured the committee through the ship. The guests were told that the propulsion plant could drive the ship at full speed while still providing enough steam for catapults to launch the Navy’s heaviest aircraft. Leighton also pointed out that Enterprise had recently arrived at Guantánamo with only five minor propulsion-plant deficiencies, compared with about one hundred for an oil-fired carrier.[37]

That evening, Captain Vincent P. de Poix testified to the demonstrated superiority of nuclear propulsion for aircraft carriers. He emphasized rapid acceleration and deceleration, maneuverability during launch and recovery operations, rapid return to base course, absence of stack gases, reduced corrosion, high sustained speed, and endurance not limited by ship fuel.[38]

The Cuban Missile Crisis provided an early operational test. On 19 October 1962, Enterprise left Norfolk under the cover of avoiding Hurricane Ella, though the Cuban crisis was the real cause. Aircraft flew aboard until she carried more aircraft than had ever before been embarked on a single carrier. She then operated near Cuba with USS Independence and supporting forces.[39] During the crisis, the conventionally powered Independence consumed approximately 5.5 million gallons of oil during forty-three days away from the United States; Enterprise consumed none for propulsion.[40]

In early 1963, Rear Admiral John T. Hayward wrote that his experience with Enterprise off Cuba and in the Mediterranean convinced him that the advantages of nuclear propulsion far outweighed the extra costs. He stated that Enterprise was outperforming every carrier in the fleet, that her aircraft were easier and cheaper to maintain because they were not exposed to corrosive stack gases, and that her propulsion reliability, high sustained speed, and maneuverability enhanced air operations. In her first year, she achieved 10,000 landings, a record no other carrier had reached.[41]

Rickover’s Congressional Testimony and Political Strategy

Congressional support was essential to the survival and expansion of the nuclear surface-ship program. Rickover understood that technical success alone would not guarantee follow-on ships. He therefore used congressional testimony and shipboard demonstrations to make the military case for nuclear propulsion.

The March 1962 Joint Committee visit to Enterprise was especially significant. Rickover argued that the high cost of nuclear surface ships was deterring the Navy from building them, but that a narrow monetary comparison missed the point. A nuclear carrier would cost more to construct and operate, he acknowledged, but the real issue was the military advantage provided by nuclear propulsion. Rickover then made his central political argument: unless the Joint Committee exerted pressure, the United States would not have a nuclear-powered surface navy.[42]

Representative Chet Holifield’s subsequent press release praised Enterprise as an impressive weapon and an atomic-energy achievement. He also praised Rickover and his organization for maintaining the standards essential to safe nuclear-plant design and maintenance.[43] The Joint Committee later published an unclassified version of the Enterprise hearings; Holifield’s foreword declared that nuclear propulsion had made tremendous progress under Rickover and that it was time to convert the surface fleet to the new technology.[44]

Rickover’s congressional campaign continued during the CVA-67 debate. In October 1962, Senator John O. Pastore convened hearings after the Department of Defense decided to proceed with a conventionally powered carrier. Witnesses included Secretary of the Navy Fred Korth, Chief of Naval Operations Admiral David L. McDonald, Rickover, de Poix, Admiral Eugene P. Wilkinson, and others. McDonald stated that the military advantages already demonstrated made it desirable to apply nuclear power to the surface fleet as fast as the budget permitted. Rickover stated that he could have the four-reactor plant ready when needed.[45]

The committee was skeptical of Department of Defense resistance. Senator Henry M. Jackson argued that the department had its priorities reversed: the Navy of the future should evolve from technologically advanced equipment, not studies.[46] McNamara later testified that a nuclear carrier was superior to a conventional one but argued that superiority did not necessarily justify the added cost given broader defense priorities.[47] The Joint Committee was not convinced.

These hearings did not immediately produce a second nuclear carrier, but they preserved momentum. In 1964, President Lyndon Johnson announced that the AEC and Department of Defense were proceeding with development of a two-reactor carrier plant under Rickover’s direction. The two reactors were expected to have about the same power rating as Enterprise’s eight reactors or the four-reactor plant proposed for John F. Kennedy.[48]

Challenges Faced

The first challenge was technical scale. Submarine reactors had proved the concept of nuclear propulsion, but carriers required far more power. The Enterprise solution—eight reactors—was effective but complex. Later core improvements demonstrated how much first-generation conservatism and technological limitation were built into the design.

The second challenge was integration. Enterprise was not simply a nuclear engineering project. It was an aircraft carrier whose propulsion plant had to support flight operations, catapults, hotel loads, and tactical maneuvering. The catapult dispute showed how a non-nuclear system could endanger the reputation of the nuclear plant.

The third challenge was cost. The ship’s projected cost rose from $314 million to $472 million, and propulsion plant equipment from $90 million to $133 million.[49] The A1W prototype alone cost $34.8 million to construct.[50] Although nuclear costs were not uniquely responsible for all escalation, the high total cost gave opponents a simple argument against follow-on ships.

The fourth challenge was schedule. Prototype testing, ship construction, and major design decisions overlapped. A1W full-power testing occurred while Enterprise was already under construction, and the catapult decision was not resolved until two days after the ship was launched.

The fifth challenge was institutional opposition. Many officials accepted that nuclear propulsion was superior but doubted whether the added cost was worth it. This led to the conventionally powered CVA-67 decision and delayed the next nuclear-powered carrier. USS Nimitz was not laid down until June 1968, nearly seven years after Enterprise entered service.[51]

Conclusion

USS Enterprise came into being through a long and contested process. The first nuclear carrier initiative, CVR, was cancelled in 1953 and redirected into Shippingport. That cancellation delayed the nuclear carrier as a shipbuilding project but strengthened Naval Reactors by giving it experience with large pressurized-water reactor technology. When the Navy returned to the nuclear carrier concept later in the decade, Rickover’s organization had the technical foundation, industrial relationships, and political credibility needed to proceed.

The ship’s design reflected both ambition and caution. Eight A2W reactors were required because first-generation carrier reactor technology could not yet provide the same power with fewer plants. The A1W prototype in Idaho reduced risk by testing a two-reactor, one-shaft version of the carrier plant before and during ship construction. It also proved that the plant could support steam-catapult operations at demanding power conditions.

Construction at Newport News was difficult, costly, and schedule-driven. Enterprise experienced major cost growth, and the nuclear carrier became a central case in the broader debate over whether nuclear propulsion justified its cost in surface ships. Rickover’s response was consistent: monetary comparison alone missed the military value of speed, endurance, maneuverability, and freedom from fuel logistics.

Early operations vindicated many of these claims. Enterprise demonstrated high reliability, rapid maneuverability, absence of stack gases, reduced aircraft corrosion, and exceptional endurance. Her performance during the Cuban Missile Crisis, her first-year landing record, and later Project Sea Orbit reinforced the case for nuclear carriers. Nevertheless, cost and institutional resistance delayed follow-on ships.

Enterprise was therefore both a technological achievement and a political argument. She proved that nuclear propulsion could transform carrier operations, but she also showed that a revolutionary naval technology had to overcome budgetary skepticism, bureaucratic resistance, industrial difficulty, and the unforgiving demands of practical engineering.