Thermal nuclear reactors using enriched uranium as fuel contains a maximum of ____________ percent fissile material i.e. U-235?
Correct answer: C. 3
- A. 1
- B. 2
- C. 3
- D. 7
Explanation
Thermal reactors commonly use uranium enriched to about 3% U-235, with the remainder primarily U-238. This enrichment provides sufficient fissile material while remaining far below weapons-grade enrichment.
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