Make us your home page
Instagram

Progress Energy determines cause of gap in Crystal River nuclear plant wall

Progress Energy now knows why layers of concrete separated in a wall at its Crystal River nuclear plant, but it has yet to put a final price tag on repairs.

The gap formed last fall as workers prepared to cut a hole in the wall of the plant's reactor containment building, according to a nine-month investigation by the utility. Fortunately, the problem was limited to the area where the work was taking place.

Also, the company's assessment of the containment dome concluded that it can handle normal and emergency operations.

Repairs had cost $25 million and replacement fuel had cost $95 million as of March 31.

Progress Energy plans to use insurance and other means, perhaps including trying to recover costs from its contractors, to "minimize the impact on customers," Progress Energy spokesman Mike Hughes said Wednesday.

Still, the outage comes at a bad time. Energy use in Florida so far this year is running more than 5 percent above normal. The Crystal River nuclear plant typically generates about 20 percent of the power Progress Energy's customers use in Florida.

With the plant offline, Progress Energy has turned to its own peak-usage generation plants and bought electricity from neighboring utilities to meet demand.

Work is under way to replace the separated concrete. The company is expected to discuss when the plant could return to service during an earnings conference call next week.

In a presentation to the Nuclear Regulatory Commission on June 30, Progress Energy said the separation, known as a delamination, formed last fall. The company powered down the plant in September for a $310 million job to replace two huge steam generators inside the reactor building.

At the time, workers were easing the tension in a series of steel reinforcing tendons embedded in the building's outer wall and were cutting a large hole in the wall.

"Those activities resulted in an additional stress that was beyond the original containment building design," Hughes said.

That means the gap didn't form before the start of the job. Progress Energy also found no other areas of separated concrete in the building.

The utility cut the 25- by 27-foot hole because the reactor building's regular equipment hatch is too small for the generators, which weigh 550 tons each. The separation inside the wall was up to 2 inches wide, and it formed about 9 inches below the outer surface of the wall, which is 42 inches thick.

The team that delved into the possible causes of the separation included experts in root cause investigation techniques, nuclear operations and maintenance, material science, computer analysis and concrete standards, testing and construction.

Refuted as possible causes were concrete shrinkage or settlement, chemical or environmentally induced stress, external events and things that happened during plant operations.

In November, the director of the NRC's Office of Nuclear Reactor Regulation said Crystal River's problem raised concerns because other nuclear plants around the country had cut into their containment walls 26 times before, but no one ever saw concrete separate like this.

NRC inspectors monitoring the repair job are looking for whether there was something about the design or construction of the reactor building that could have contributed to the formation of the gap, agency spokesman Roger Hannah said.

So far, he said, nothing presented by the company or turned up by inspectors indicates a design or construction flaw played a role.

Reach Richard Danielson at danielson@sptimes.com or (813) 226-3403.

Progress Energy determines cause of gap in Crystal River nuclear plant wall 07/28/10 [Last modified: Wednesday, July 28, 2010 9:20pm]
Photo reprints | Article reprints

© 2017 Tampa Bay Times

    

Join the discussion: Click to view comments, add yours

Loading...
  1. Rick Scott appoints 'my friend,' Jimmy Patronis, as Florida CFO

    State Roundup

    PANAMA CITY — Gov. Rick Scott on Monday picked close friend and supporter Jimmy Patronis to be Florida's next chief financial officer, a lucrative prize for loyalty that casts new light on Patronis' pro-business votes as a legislator and his support for higher electricity costs as a regulator.

    Rick Scott appoints Jimmy Patronis (background) as CFO. [STEVE BOUSQUET | Tampa Bay Times]
  2. Local gas prices plummet as Fourth of July holiday travel approaches

    Tourism

    TAMPA — Local gas prices are enjoying an unseasonal dip around the $2 mark just in time for the hectic Fourth of July holiday travel weekend.

    The price of regular unleaded gasoline has dropped to $1.99 at a Rally station on Pasadena Ave. South and Gulfport Boulevard South, South Pasadena.
[SCOTT KEELER   |   Times]

  3. Air bag recalls, lawsuits lead Takata to file for bankruptcy

    Autos

    Shattered by recall costs and lawsuits, Japanese air bag maker Takata Corp. filed Monday for bankruptcy protection in Tokyo and the U.S., saying it was the only way it could keep on supplying replacements for faulty air bag inflators linked to the deaths of at least 16 people.

    Japanese air bag maker Takata Corp. CEO Shigehisa Takada bows during a press conference in Tokyo on Monday. Takata has filed for bankruptcy protection in Tokyo and the U.S., overwhelmed by lawsuits and recall costs related to its production of defective air bag inflators.
[(AP Photo/Shizuo Kambayashi]
  4. Airbag maker Takata bankruptcy filing expected in Japan, U.S.

    Corporate

    DETROIT — Japanese airbag maker Takata Corp. has filed for bankruptcy protection in Tokyo and the U.S., overwhelmed by lawsuits and recall costs related to its production of faulty air bag inflators.

  5. Federal agencies demand records from SeaWorld theme park

    Tourism

    ORLANDO — Two federal agencies are reportedly demanding financial records from SeaWorld.

    Killer whales Ikaika and Corky participate in behaviors commonly done in the wild during SeaWorld's Killer Whale educational presentation in this photo from Jan. 9. SeaWorld has been subpoenaed by two federal agencies for comments that executives and the company made in August 2014 about the impact from the "Blackfish" documentary. 
[Nelvin C. Cepeda/San Diego Union-Tribune/TNS]