- Associated Press - Tuesday, June 28, 2011

BLAIR, Neb. (AP) — The utilities that run Nebraska’s two nuclear power plants want the public to know the facilities are safe, even though floodwaters from the Missouri River have surrounded one plant and are encroaching on another.

The Fort Calhoun and Cooper nuclear power plants were both opened up to federal regulators and the media this week as part of a battle against persistent Internet rumors about their safety.

The Omaha Public Power District’s Fort Calhoun plant is the subject of more public concern because floodwaters have surrounded that facility and forced workers to use raised catwalks to access it. Nebraska Public Power District’s Cooper plant is more elevated, so the floodwaters aren’t as close to the facility.

“There is no possibility of a meltdown,” OPPD CEO Gary Gates said Monday. “The floodwaters are outside of Fort Calhoun, not inside.”

Nuclear Regulatory Commission Chairman Gregory Jaczko offered support for both utilities after visiting the plants. He said both Fort Calhoun and Cooper remain safe.

But whether their statements can slow the online rumor mill remains to be seen. Some speculate that the Nebraska flooding somehow could spawn a disaster comparable to one in northeastern Japan in March, when a massive earthquake and tsunami destroyed power and cooling systems at the Fukushima Dai-ichi nuclear plant, melting reactor cores and leaking massive amount of radiation. Nebraska utility officials say that’s next to impossible.

One of the key differences between the Fukushima disaster and the Missouri River flooding is that the river flooding has progressed slowly and the utilities have had several weeks to prepare.

“There is little to no chance of anything like Fukushima happening here,” said Tim Nellenbach, who oversees Fort Calhoun’s nuclear operations.

Mr. Jaczko’s visit to Fort Calhoun on Monday came one day after an 8-foot-tall, water-filled temporary berm protecting the plant collapsed. OPPD plans to replace the 2,000-foot berm with a similar one early next month and then pump out the floodwaters to restore a dry buffer area.

“We don’t believe the plant is posing an immediate threat to the health and safety of the public,” Mr. Jaczko said.

Omaha Public Power District spokesman Jeff Hanson said pumps at Fort Calhoun were handling the problem and that “everything is secure and safe.” The plant, about 20 miles north of Omaha, has been closed for refueling since April. Mr. Hanson said the berm’s collapse didn’t affect the shutdown or the spent fuel pool cooling.

Either floodwaters from the Missouri River or groundwater seeped into several of the peripheral buildings at Fort Calhoun, but Mr. Nellenbach said all of the areas containing radioactive material or crucial safety gear remained dry.

One of the biggest threats to the safety of any nuclear power plant would be a prolonged loss of electrical power because the plants need to be able to continue pumping water over the radioactive fuel to keep it cool.

A key factor in the disaster at the Fukushima Dai-ichi facility was the loss of all off-site power and emergency generators after the earthquake and tsunami struck.

Fort Calhoun has at least nine power sources in place, including six different power lines and two backup diesel generators, which were tested Sunday after the failure of the water-filled berm.

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