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on the "depleted" side, will inevitably be enriched slightly stronger than , which is a negligible effect in a once-through fuel cycle due to the low (55 ppm) share of in natural uranium can become relevant after successive passes through an enrichment-burnup-reprocessing-enrichment cycle, depending on enrichment and burnup characteristics. readily absorbs thermal neutrons and converts to fissile , which needs to be taken into account if it reaches significant

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