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NRC clarifies 'catastrophic failure' at Yankee
By KRISTI CECCAROSSI
Reformer Staff
Thursday,
July 28, 2005 - VERNON -- There
was no catastrophe at Vermont Yankee this week. At least not one plant
officials or regulators have yet detected.
There was,
however, a "catastrophic failure" of a piece of equipment in the
plant's switchyard, which bumped the 540-megawatt reactor offline, where it
remains today.
Around
3:30 p.m., Monday, an 8-foot-tall electrical insulator broke, sending a signal
through the plant that shut down its generator, turbines and reactor.
Staff in
Vermont Yankee's control room observed the failure and, as required, they sent
a report to the federal Nuclear Regulatory Commission. The first sentence of
which reads "the plant experienced a load reject ... due to a catastrophic
failure in the 345 kV switchyard."
The
report, which made rounds on the Internet after being published on the NRC's
Web site, set off undue some alarms, said Neil Sheehan, a spokesman for the
agency.
"'Catastrophic'
is a term used fairly frequently. It really just means there was a sudden
failure of a piece of equipment. The safety significance was blown out of
proportion," Sheehan said. "'Catastrophic failure' conveys something
much more significant than it should."
Rob
Williams, a spokesman for Entergy Nuclear Vermont Yankee said the
"catastrophic" term, as published in some news reports, was
misinterpreted.
"Catastrophic is accurate. It means the piece broke
apart all at once," he said. "But it caused some unnecessary public
concern."
The
broken electrical insulator was sent to a laboratory to be tested, Williams
said, and a new insulator has been installed. As of Wednesday night, he said
engineers were preparing to restart the plant.
The
governor of New Hampshire scolded Vermont Yankee officials Wednesday for not
notifying his state officials sooner about the shutdown.
"It's a big concern for me that Vermont Yankee officials
failed to notify New Hampshire of all the facts surrounding the incident as it
was unfolding," Gov. John Lynch said in a statement released by his
office.
Lynch
continued, "We need a full accounting from Vermont Yankee of exactly what
happened, why New Hampshire wasn't notified and how we can be assured this type
of communication oversight by Vermont Yankee does not happen again. We also
need assurances that the plant is indeed safe to operate in light of Monday's
event."
Williams
said plant officials are required to notify the Vermont, New Hampshire and
Massachusetts emergency management agencies within 15 minutes when there is an
emergency at the plant.
But plant
officials didn't think Monday's shutdown fit within those guidelines, Williams
said. It was not defined as an emergency by the NRC's standards and no radiation
was released as a result of the shutdown.
While
Vermont Yankee has been offline, Central Vermont Public Service and Green
Mountain Power have been shopping on the open market for replacement energy.
That
comes at a higher price for the state utilities, the costs of which could
eventually be passed on to ratepayers, according to Stephen Costello, a
spokesman for CVPS.
The last
time Vermont Yankee shut down unexpectedly was slightly more than a year ago.
A
transformer fire closed the plant from June 18 to July 5, 2004. The 17-day
outage cost CVPS $860,000 and Green Mountain Power $525,000.
Entergy
Nuclear Vermont Yankee officials have said the fire was due to their failure to
properly maintain and monitor equipment. However, there is still a dispute
between CVPS and plant owners about the cause.
If CVPS
can prove the fire was related to a 20 percent power "uprate" under
way at the plant right now, Vermont Yankee will have to reimburse the utility
for money spent buying replacement power during the last outage.
When the
state's Public Service Board approved the plant's uprate proposal last March,
it did so with provisions: if the plant goes offline because of uprate-related
work, Vermont Yankee is required to repay utilities for costs incurred during
the outage. Whether this can be applied to last year's fire is now a question
before the Public Service Board.
Information from the Associated Press was used in this
report.
Kristi Ceccarossi can be reached at kceccarossi@reformer.com