EU court rules nuclear energy is clean energy

Re:EU court rules nuclear energy is clean energy by Polizeiposaune on Friday September 12, 2025 @03:08PM (#45225514)

Natural uranium on earth is currently about 0.7% U-235; civilian power reactors typically need low-enriched uranium which is 3% to 5% U-235.

The critical mass required for a weapon shrinks as enrichment increases; implosion designs would require an infinite mass at or below 5.4% enrichment (see https://en.wikipedia.org/wiki/Enriched_uranium).

Weapons-grade uranium is more like 85%+ U-235. Enrichment above around 20% is what really raises red flags.

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Re:EU court rules nuclear energy is clean energy by magicalhippo on Friday September 12, 2025 @03:40PM (#45225868)

> Enrichment above around 20% is what really raises red flags.

Which, as I understand it, is because at 20% enrichment you've already done about 70% of the work needed to get to 85%.

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