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A Natural Nuclear Reactor? Yes, It Exists!

As is often the case, this scientific story begins with an enigma. It concerns a uranium sample. And routine analysis. Which showed impossible results. In 1972, a uranium sample was analyzed by the physicist Francis Perrin, in the Pierrelatte military enrichment plant (an installation that has now been dismantled). Measurements show a 0.717% content of uranium-235 — the fissile isotope that allows chain reactions. This content is usually 0.720%.…
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As is often the case, this scientific story begins with an enigma. It concerns a uranium sample. And routine analysis. Which showed impossible results. In 1972, a uranium sample was analyzed by the physicist Francis Perrin, in the Pierrelatte military enrichment plant (an installation that has now been dismantled). Measurements show a 0.717% content of uranium-235 — the fissile isotope that allows chain reactions. This content is usually 0.720%.…

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Révolution Energétique broke the news in on Wednesday, February 25, 2026.
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