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In page Pebble-bed reactor:

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PBR waste volumes are much greater, but have similar radioactivity measured in becquerels per kilowatt-hour. The waste tends to be less hazardous and simpler to handle.[citation needed] Current US legislation requires all waste to be safely contained, requiring waste storage facilities. Pebble defects may complicate storage. Graphite pebbles are more difficult to reprocess due to their construction.[citation needed]