RV Otto Hahn

RV Otto Hahn was a German nuclear-powered cargo ship and research vessel, one of only four such merchant ships ever built. Named after the pioneering chemist and Nobel Prize winner Otto Hahn, it was constructed to explore the feasibility of nuclear propulsion for civilian maritime transport. Operated by the GKSS Research Centre and later the German Aerospace Center, the vessel conducted extensive oceanic research after its nuclear reactor was decommissioned.

History and development

The project was initiated in the early 1960s by a consortium including the Federal Ministry of Research and the GKSS Research Centre in Geesthacht. The keel was laid at the Howaldtswerke-Deutsche Werft shipyard in Kiel in 1964, with the design heavily influenced by the earlier American vessel NS Savannah. The launch in 1967 was attended by Lise Meitner, a close collaborator of Otto Hahn, symbolically linking the ship to the legacy of nuclear fission research. The total development cost, partially funded by the European Atomic Energy Community, reflected the high-stakes technological ambitions of the era during the Cold War.

Design and specifications

The vessel had a length of 172 meters and a gross tonnage of 16,870, with a distinctive profile featuring a large central superstructure. Its hull was constructed to the highest standards of the Germanischer Lloyd classification society to ensure safety in nuclear operations. Accommodation was provided for 63 crew members and up to 38 scientists, with laboratories, workshops, and extensive sensor systems for oceanographic research. The design prioritized redundancy and containment, with the reactor compartment heavily shielded and located amidships, a layout studied in parallel by engineers at MIT and the University of Hamburg.

Nuclear propulsion system

The heart of the propulsion system was a single Babcock & Wilcox pressurized water reactor, a design similar to those used in American submarines like the USS *Nautilus*. This reactor generated steam for a Siemens turbine, driving a single propeller shaft to achieve a service speed of 17 knots. The reactor used enriched uranium fuel and was licensed under strict oversight from the Federal Office for Radiation Protection in Bonn. Its operation provided invaluable data for subsequent reactor designs at institutions like the Jülich Research Centre and informed international safety protocols discussed at the International Atomic Energy Agency.

Operational history

After sea trials in the Baltic Sea, the ship entered service in 1968, initially making commercial voyages to test economic viability, including calls at ports in South America and Africa. By 1972, the focus shifted entirely to scientific research under the management of the GKSS Research Centre. For over a decade, it conducted crucial studies on North Atlantic currents, marine biology in the Mediterranean Sea, and geophysical surveys. It often collaborated with research bodies like the Alfred Wegener Institute and participated in international projects coordinated by UNESCO's Intergovernmental Oceanographic Commission.

Decommissioning and legacy

Rising operational costs and public skepticism towards nuclear technology led to the shutdown of the reactor in 1979. The ship was converted to diesel propulsion at the HDW-Gaarden shipyard and continued research until its final retirement in 2009. The reactor compartment was removed and disposed of at the Mitterteich interim storage facility under the supervision of the Federal Ministry for the Environment. The hull was eventually towed to Aliaga, Turkey, and scrapped between 2016 and 2017. The ship's legacy endures through its extensive environmental data sets, which remain valuable for climate change studies, and its role in advancing maritime nuclear safety standards that influenced later projects like the Russian floating nuclear power station *Akademik Lomonosov*.

Category:Research vessels of Germany Category:Nuclear-powered ships Category:Ships built in Kiel Category:1967 ships