Spent Nuke Pool Water Drains

Monday, July 30, 2012 @ 01:07 PM gHale

Water from the spent fuel pool at Vermont Yankee Nuclear Power Plant drained into a wastewater system Sunday because employees didn’t follow proper procedures, officials said.

Just about 2,700 gallons of water drained into the wastewater system. The 300,000 gallon pool contains 2,500 spent fuel assemblies removed from the reactor core. The spent fuel assemblies are in more than 20 feet of water.

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The water drained about six inches over the course of 30 minutes when employees who were working on the fuel pool cleanup system left drain valves open. Operators in the control room discovered the problem after an alarm system went off, said Rob Williams, spokesman for the plant. The radioactive water drained into a wastewater collection tank.

Employees didn’t follow proper procedures, Williams said. Entergy Corp., which owns the plant, will be reviewing maintenance protocols.

Vermont Yankee did not send out a press release about the incident. Williams said notifying the public was not necessary because safety wasn’t at issue.

The plant has clear-cut reporting criteria, said Neil Sheehan, spokesman for the regional 1 district office for the Nuclear Regulatory Commission (NRC). If a fire at the plant lasts for more than 15 minutes or if offsite firefighting assistance comes in, the plant must report. This incident, he said, “fell in the category of not having to be reported because it was a very low level risk and it was caught quickly.” Employees were not at risk of exposure to radiation because the amount of water over the assemblies provides ample shielding, he said.

The NRC’s resident inspector is reviewing the incident, he said.

“There’s no good reason for this to happen at any point,” Sheehan said. “It speaks to human error and attention to detail no question about that.”

Arnie Gundersen, a nuclear engineer and former member of a Vermont Yankee oversight panel, said several steps in a procedure were skipped by employees. He is concerned about oversight and employee training at the plant as older workers retire. Procedures, he said, must be much more specific.

“It’s a big deal, it’s a safety-related system, we’re not talking about mowing the lawn at VY,” Gundersen said. “There’s 300,000 gallons in pool, and it lost 1 percent of the water in 30 minutes. It is radioactive water, it’s not like what you put in water cooler.”

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