Distinguish between enrichment and reprocessing in the nuclear fuel cycle.

Distinguish between enrichment and reprocessing in the nuclear fuel cycle.

• A. Enrichment increases the fissile fraction of uranium before fuel fabrication; reprocessing separates usable uranium and plutonium from spent fuel for reuse.
• B. Enrichment increases the fissile fraction before fuel fabrication; reprocessing reduces it afterward.
• C. Enrichment and reprocessing are both refer to cooling times.
• D. Enrichment and reprocessing are the same process.

Answer: (A)

Distinguish two stages of handling uranium fuel. Enrichment is the pre-fabrication step that increases the percentage of fissile U-235 in natural or depleted uranium so the fuel can sustain a reactor. Natural uranium is only about 0.7% U-235, so enrichment raises that fraction to roughly 3–5% before the fuel is made. Reprocessing is a post-irradiation step. After spent fuel has cooled, chemical processes separate usable materials—primarily uranium and plutonium—from highly radioactive fission products. The recovered uranium and plutonium can be recycled into new fuel (for example, MOX fuel or reuse of uranium), while the fission products become waste. So the best answer correctly identifies enrichment as increasing the fissile fraction before fuel fabrication, and reprocessing as recovering usable materials from spent fuel for reuse. The other choices mix up the timing or nature of the processes (cooling is not what defines them, and they are not the same process).

Distinguish two stages of handling uranium fuel. Enrichment is the pre-fabrication step that increases the percentage of fissile U-235 in natural or depleted uranium so the fuel can sustain a reactor. Natural uranium is only about 0.7% U-235, so enrichment raises that fraction to roughly 3–5% before the fuel is made.

Reprocessing is a post-irradiation step. After spent fuel has cooled, chemical processes separate usable materials—primarily uranium and plutonium—from highly radioactive fission products. The recovered uranium and plutonium can be recycled into new fuel (for example, MOX fuel or reuse of uranium), while the fission products become waste.

So the best answer correctly identifies enrichment as increasing the fissile fraction before fuel fabrication, and reprocessing as recovering usable materials from spent fuel for reuse. The other choices mix up the timing or nature of the processes (cooling is not what defines them, and they are not the same process).