The paper compares the use of gas turbine/stream turbine combined power plants and pressurized water nuclear power plants to power LNG carriers design for Arctic service. The paper is based on the work done by a team of USMMA midshipmen who participated in a SNAME/MARAD competition for the design of an Ultra Green Arctic Shipping Vessel/System. The two plant designs will be reviewed as well as the economic and environmental benefits of each plant. The application of the plants to a specific transit route and a specific size vessel will also be presented. For the example vessels the nuclear powered vessel will utilize on-board liquefaction and the combined cycle plant will utilize the boil-off as fuel.

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