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Nuclear Regulatory Commission spokesman Victor Dricks, speaking for the region that includes Nebraska, dismissed worst-case scenarios as speculation.

Flooding of the plants is “not a concern,” he said.

The second plant, the Cooper Nuclear Station, located several miles from the Nebraska-Missouri border, has not experienced any flooding, and as of Monday, continued to operate at full capacity, said Mark Becker, a spokesman for the Nebraska Public Power District, which operates the plant.

Workers at the plants continued to prepare for flooding by placing sandbags and 8-foot-tall water-filled rubber barriers to protect the reactors from the river water, officials said.

Recently, some buildings at Fort Calhoun suffered water damage, but they were described as “minor buildings,” including a warehouse, that pose no risk for the possible release of radiation, Mr. Hanson said.