Nuclear reactors engineered specifically for marine or vehicle propulsion are designed to feature_______________?
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Answer: B. enriched uranium
Explanation
Compact reactors designed for marine or vehicle propulsion require enriched uranium to achieve high power density. Enriched fuel allows the physical reactor core to remain remarkably small while generating immense thermal power outputs. Using natural uranium would require massive core volumes and heavy moderators that are impractical for mobile vehicle platforms. Marine propulsion reactors power naval submarines and aircraft carriers, operating reliably for decades without refueling. Space and vehicle nuclear applications demand high-integrity containment and concentrated fissile fuel configurations. Enriching the U-235 isotope concentration compensates for the small physical geometry and neutron leakage in compact cores.
Option A is incorrect because natural uranium has too low a fissile concentration to sustain a compact marine reactor core. Option C is wrong because pure unalloyed uranium metal is rarely used directly without isotopic enrichment and structural cladding. Option D is incorrect because specific nuclear propulsion designs strictly mandate enriched uranium rather than any arbitrary fuel type.
- Subject
- Engineering
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- Mechanical Engineering
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