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The Stig
02-01-2012, 10:57 PM
Original story from ABC news (http://abcnews.go.com/blogs/headlines/2012/02/san-onofre-nuclear-plant-closed-after-radiation-leak/)


San Onofre Nuclear Plant Closed After Radiation Leak

A small quantity of radioactive gas leaked inside one of the buildings at San Onofre nuclear power plant north of San Diego, according to a spokesman for the Nuclear Regulatory Commission.

The spokesman said the radiation levels were “barely measurable,” but concern was high enough to shut the plant down.

Officials say the radiation leak likely occurred in the steam generator tubes of San Onofre’s reactor #3. The steam system, which is supposed to be shielded from exposure to radiation, was replaced in December 2010.

San Onofre is one of dozens of U.S. reactors facing new scrutiny after Japan’s nuclear crisis. It is located right on the coast, and in the heart of America’s earthquake country.

It also is right next door to Camp Pendleton, the Navy’s West Coast hub, where 70,000 sailors, marines and their families would be in immediate danger if there’s ever a meltdown.

ABC News visited San Onofre the day the Fukushima Daiichi plant in Japan melted down. At the time, plant officials were eager to reassure the public that the same thing could not happen on the California coast.

“This plant is safe,” California Edison’s Chief Nuclear Officer Pete Dietrich told ABC News.

After Japan, the Nuclear Regulatory Commission updated its seismic model and in a report issued yesterday found that 96 reactors in the central and southern U.S. may be at a higher risk for quakes than previously thought.

The report included parts of the country that are not traditionally seen as geologically active, places like Chattanooga, Tenn., Savannah, Ga., Jackson, Miss., Manchester, N.H., and Houston, Texas.

Major metropolitan areas are uncomfortably close to major nuclear plants, with as many as 120 million Americans living within 50 miles of a nuclear reactor, according to the Union of Concerned Scientists.

Indian Point, outside of New York City, has 20 million people living within a 50-mile radius. And Dresden is just 50 miles from the heavily-populated suburbs of Chicago.

Nuclear regulators plan to give plant operators four years to reevaluate seismic risks, but some of the plants may be too expensive to make earthquake safe.

However, in the case of San Onofre, it’s unlikely the leak had anything to do with seismic safety and was probably just faulty equipment. Officials have been taking extra care to reassure the public that there’s no danger, since after Japan, the idea of radiation leaking from a nuclear plant tends to set people on edge.

Grumpy Old Man
02-01-2012, 11:00 PM
San Onofre- a mere 60 miles SW of Grumpyville! I'll let you all know what the local (LA) news says about it.

The Stig
02-01-2012, 11:02 PM
Found this loosely related article while searching for more info on the above.

From Wall Street Journal (http://online.wsj.com/article/SB10001424052970203920204577195121591806242.html?m od=WSJ_WSJ_US_News_5)


New Risks for Nuclear Plants
Reactors in Central, Eastern U.S. Face Greater Earthquake Threat, Study Finds

By REBECCA SMITH

Nuclear reactors in the central and eastern U.S. face previously unrecognized threats from big earthquakes, the Nuclear Regulatory Commission said Tuesday. Experts said upgrading the plants to withstand more substantial earth movements would be costly and could force some to close.

Dozens of nuclear reactors operate in earthquake-prone regions around the world. Among them, least 34 are in high-hazard areas; 17 of those are within a mile of a coastline.

The NRC said it would require nuclear-plant operators to conduct new seismic studies for all 96 reactors in eastern and central states to determine if the plants could withstand the shaking predicted by the government's new seismic model.

Updating the U.S. survey of past seismic activity became urgent after a 9.0-magnitude earthquake and tsunami devastated northeastern Japan last March. The event overwhelmed the defenses of reactors at the Fukushima Daiichi site, causing widespread damage and radioactive releases. The earthquake exceeded the level for which the reactors had been designed, calling into question earlier seismic assessments.

The NRC plans to give nuclear-plant operators four years to re-evaluate risks by running complex calculations for all structures, systems and components. By law, nuclear plants must be able to withstand earthquakes "without functional impairment of those features necessary to shut down the reactor, maintain the station in safe condition and prevent undue risk to the health and safety of the public."

The seismic study "is an important piece of work but it doesn't tell us what needs to be done," said Alex Marion, vice president for nuclear operations at the Nuclear Energy Institute, a trade organization. "The model will need to be applied to specific sites and that will take awhile."

Critics said regulators are moving too slowly. "The NRC does not need a new model—it needs a spine," said Dave Lochbaum, director of nuclear safety for the Union of Concerned Scientists in Chattanooga, Tenn. The NRC already has sufficient evidence to require immediate upgrades to dozens of plants, he said, adding that further delay amounts to a "bureaucratic stall tactic."

The NRC has said it needs more information before requiring upgrades. NRC spokesman Scott Burnell said it was possible "that operators will do the analyses and say, 'Our existing safety margin covers it, so no upgrades are needed.' We just don't know yet."

Any required retrofits could be expensive. "To go back into some of these older plants and deal with seismic issues might end up costing more than the plants are worth," said Stephen Maloney, a partner at Azoulas Risk Advisors in Boston, a consulting firm that works with the nuclear industry. That could force such plants to close.

The seismic model could influence new seismic maps the U.S. Geological Survey is expected to issue next year, and could affect building codes and insurance rates.

The new model was jointly developed by the NRC, the U.S. Department of Energy and an industry-funded research group, the Electric Power Research Institute. The model incorporates information on about a thousand earthquakes that previously weren't cataloged. Those were determined through written records, geologic data, carbon dating and other methods. The research brings the total to nearly 3,300 quakes in the region since 1568.

The model shows increased hazards at many locations. For example, it indicates that the single worst earthquake likely to happen in a 10,000-year period in Chattanooga, Tenn., would be nearly twice as damaging to structures as previously calculated. Scientists found similar hazards at six other locations where they did spot checks: Houston; Manchester, N.H.; Jackson, Miss.; Topeka, Kan.; central Illinois; and Savannah, Ga.

Atlanta-based Southern Co. hopes to build two reactors in central Georgia, about 100 miles from Savannah. The company took the latest seismic information into account and believes the reactors will meet the standard of the new model, said B.L. "Pete" Ivey, a vice president. But Southern will need to run calculations for its existing reactors to see if they meet the standard, he said.

Because regulators worry about "low probability/high consequence" events like the one in Japan, much seismic research now is focused on the central and eastern U.S., an area once seen as less active geologically than the West. There are 96 reactors in the region, compared with just eight in the West.

Scientists, using computers, satellites and field data, now know there have been many huge earthquakes in the central and eastern regions of the country. And shock waves travel far in the East because the Earth's crust is more rigid there than in the West.

Write to Rebecca Smith at rebecca.smith@wsj.com

bacpacker
02-02-2012, 12:33 AM
More good news. I'm way to close to Oak Ridge and Watts Bar.

GunnerMax
02-02-2012, 08:10 AM
two reactors within 2 days?

bacpacker, I went to Oak Ridge back in about 2006, during a 1 month stay at UTK. I loved that area, and it pinged my interest in physics/mechanics)

bacpacker
02-02-2012, 12:07 PM
I don't care for Oak Ridge itself, most people are arrogant asses. The areas around there are great. The plants are some of the better jobs in the area, but are going thru major job reductions and budget cuts right now.

2 in 2 days does give you a good feelin don't it?

Grumpy Old Man
02-02-2012, 04:44 PM
other than the initial announcement, the news has been particularly quiet about this. Hmmmmmmmm!

bacpacker
02-03-2012, 12:31 AM
Here is the latest I could find.

Worn tubes found San Onofre nuclear facility after leak - latimes.com (http://latimesblogs.latimes.com/lanow/2012/02/regulators-find-worn-tubes-at-san-onofre-nuclear-facility.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+lanowblog+%28L.A.+Now%29&utm_content=Google+Feedfetcher)


Regulators find worn tubes at San Onofre nuclear power plant
Nuclear regulation officials said Thursday that extensive wear had been found on the tubes inside a unit at the San Onofre nuclear plant, where another unit was placed off-line after a leak earlier this week.

Dozens of relatively new tubes that carry radioactive water in a steam generator showed "many, many years" worth of wear, even though the tubing is 22 months old, said Victor Dricks, a spokesman for the Nuclear Regulatory Commission.

izzyscout21
02-03-2012, 12:40 AM
I'm kinda creeped out now. Lets see if another one goes down tomorrw

The Stig
02-03-2012, 01:38 AM
Two of these reported so closely together....

....I don't believe in coincidences. What it means is anybodies guess but as Izzy said...creepy.