A4W
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A4W Definition from Encyclopedia Dictionaries & Glossaries
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A4W reactor
The A4W reactor is a naval reactor used by the United States Navy to provide electricity generation and propulsion on warships. The A4W designation stands for:
- A = Aircraft carrier platform
- 4 = Fourth generation core designed by the contractor
- W = Westinghouse was the contracted designer
The only ships to use these nuclear reactors are the Nimitz class supercarriers, which operate with a pair of A4Ws aboard each vessel. The steam generators for each of the Nimitz classes's reactors are capable of supplying enough energy to produce 140,000 shaft horsepower (104 MWe). The A4W reactor cores are expected to have a lifespan of approximately 23 years.
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