Which uranium grade is used to fuel US and UK naval reactors at about 93% U-235?

Which uranium grade is used to fuel US and UK naval reactors at about 93% U-235?

• A. Low enriched uranium
• B. High enriched uranium
• C. Reactor grade uranium
• D. Weapon grade uranium

Answer: (D)

Naval reactors use fuel with an extremely high concentration of U-235 to maximize energy density, enabling a compact core and long periods between refueling. About 93% U-235 is the hallmark of weapon-grade uranium, which sits at the high end of highly enriched uranium and is the specific grade associated with military propulsion needs. The other terms describe different enrichment levels that aren’t specific to the naval context: low enriched uranium has only a few percent U-235 and would require frequent refueling, while “reactor-grade” is a less precise label and generally refers to fuel with more impurities and lower enrichment. So the fuel used in US and UK naval reactors at that enrichment level is weapon-grade uranium.

Naval reactors use fuel with an extremely high concentration of U-235 to maximize energy density, enabling a compact core and long periods between refueling. About 93% U-235 is the hallmark of weapon-grade uranium, which sits at the high end of highly enriched uranium and is the specific grade associated with military propulsion needs. The other terms describe different enrichment levels that aren’t specific to the naval context: low enriched uranium has only a few percent U-235 and would require frequent refueling, while “reactor-grade” is a less precise label and generally refers to fuel with more impurities and lower enrichment. So the fuel used in US and UK naval reactors at that enrichment level is weapon-grade uranium.