The 630A Nuclear Steam Generator (Figure 1) consists of an air-cooled, water moderated reactor using metallic fuel elements, a once-through water tube boiler, two axial-flow blowers, lead and water shielding, controls, and necessary auxiliary equipment. The system is designed to replace the-boiler-of-a-conventional ship;no other propulsion equip ment need be replaced nor modified. The 630A is about 35 feet high and 18 feet in diameter;it weighs about 400 tons. Its relatively small size and low weight make it suitable for use in both new construction and in converting existing ships to nuclear power.
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