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CARLSBAD, N.M. (AP) — The nation’s only underground nuclear waste repository is undergoing its first maintenance outage since it resumed operations a year ago.

Before then, the Waste Isolation Pilot Plant had been shut down for three years because radiation contaminated part of the facility.

The Carlsbad Current-Argus reports that maintenance crews will be updating power supplies, relocating fiber-optic cables and replacing other parts in the underground mine.

The work is expecting to last until Jan. 26. Waste shipments will be on hold until the following week.

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The facility disposes of waste from decades of bomb-making and nuclear research.