Latest Update on why Browns Ferry Unit 1 went down.... (From: http://www.al.com/news/huntsvilletimes/index.ssf?/base/news/1180084568254030.xml&coll=1)
Spill during tests not radioactive;restart is delayed
The Unit 1 nuclear reactor at Browns Ferry, which TVA began operating Tuesday after a long dormant period, was shut down early Thursday following a 600-gallon leak of hydraulic fluid from a control system.
The incident occurred around 2 a.m., the Nuclear Regulatory Commission said, after workers were trying to repair a small leak in the electro-hydraulic control system, which regulates water into the reactor, steam and condensation.
The incident did not involve radioactive material.
Malcolm Widmann, branch chief for the NRC's Division II reactor projects, who helped oversee inspections for the five-year, $1.8 billion restart effort on Unit 1, said that the event didn't affect plant safety systems and that the unit was operating at very low power.
Craig Beasley, spokesman for Browns Ferry, said the utility is cleaning up the fluid, which spilled in the turbine building. He said the Tennessee Valley Authority has not determined when it will restart the reactor and resume the testing program.
Prior to the initial Unit 1 restart, TVA said it gradually would increase power in the reactor and test its systems for several weeks to ensure safe operations.
Beasley said the incident Thursday is the kind of thing the testing program is designed to address.
Two workers were sprayed by the fluid, Beasley said, and were taken to Athens-Limestone Hospital for observation. Both workers went back to work Thursday, Beasley said.
TVA's restart of Unit 1 officially began early Tuesday, some 22 years after the plant was shut down for safety reasons. The successful completion of TVA's planning and NRC inspections followed thousands of hours of engineering, construction and modification work. The restart was widely noted and cheered by the nuclear power industry.
That the piping separated so shortly after operation resumed does not suggest that the plant has bigger issues, Widmann said.
"It's kind of normal, the types of trouble you can run into when you've done so much work," Widmann said. "They've got a lot of testing to do, a lot of things they need to address.
"Does this set them back? Yes. Does it change how we approach what they're doing? No."
David Lochbaum, a former TVA employee and nuclear power expert with the Union of Concerned Scientists in Washington, D.C., said starting a nuclear reactor, even after a short fueling outage, often leads to discoveries of problems.
"It seems inconsistent with having spent all that money to get the plant to start up, but, to be fair, it is not uncommon," Lochbaum said. "If a plant has been shut down for a while, you will have a couple of bumps on a restart. You can inspect pipes, walk down the cabling, but until you pressurize the system, the little-bitty stuff is hard to find.
"It's not uncommon for a plant to have a surprise like this."