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On the Brink of Meltdown

Saturday, March 12 2011 @ 11:42 AM CST

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The Fukushima Nuclear Power Plant

The devastating Japanese quake and its outcome could generate a political tsunami here in the United States.

by Robert Alvarez

In the aftermath of the largest earthquake to occur in Japan in recorded history, 5,800 residents living within five miles of six reactors at the Fukushima nuclear station have been advised to evacuate and people living within 15 miles of the plant are advised to remain indoors.

Plant operators haven't been able to cool down the core of one reactor containing enormous amounts of radioactivity because of failed back-up diesel generators required for the emergency cooling. In a race against time, the power company and the Japanese military are flying in nine emergency generators. Secretary of State Hillary Clinton announced today that the U.S. Air Force has provided cooling water for the troubled reactor. Complicating matters, Japan's Meteorological Agency has declared the area to be at high risk of being hit by a tsunami.

The plant was operating at full power when the quake hit and even though control rods were automatically inserted to halt the nuclear reaction, the reactor core remains very hot. Even with a fully functioning emergency core cooling system, it would take several hours for the reactor core to cool and stabilize. If emergency cooling isn't restored, the risks of a core melt, and release of radioactivity into the environment is significantly increased. Also, it's not clear if piping and electrically distribution systems inside the plant have been damaged. If so, that would interfere with reactor cooling.

A senior U.S. nuclear power technician tells me the window of time before serious problems arise is between 12 and 24 hours.

Early on, Japanese nuclear officials provided reassurances that no radiation had been released. However, because the reactor remains at a very high temperature, radiation levels are rising on the turbine building – forcing to plant operators to vent radioactive steam into the environment.

The devastating Japanese quake and its outcome could generate a political tsunami here in the United States. For instance, it may become impossible for the owners of the San Onofre and Diablo Canyon reactors to extend their operating.

These two California reactors are sitting in high seismic risk zones near earthquake faults. Each is designed to withstand a quake as great as 7.5 on the Richter scale. According to many seismologists, the probability of a major earthquake in the California coastal zone in the foreseeable future is a near certainty. The U.S. Geological Survey reports the largest registering 8.3 on the Richter scale devastated San Francisco in 1906.

"There have been tremblers felt at U.S. plants over the past several years, but nothing approaching the need for emergency action," Scott Burnell, a spokesman at the Nuclear Regulatory Commission told Reuters.

As the 25th anniversary of the Chernobyl nuclear catastrophe approaches next month, Japan's earthquake serve as a reminder that the risks of nuclear power, when things go seriously wrong. The Chernobyl accident required nearly a million emergency responders and cleanup workers. More than 100,000 residents from 187 settlements were permanently evacuated because of radioactive contamination. And area an equal to half of the State of New Jersey was rendered uninhabitable.

Fortunately, U.S. and Japanese reactors have extra measures of protection that were lacking at Chernobyl, such as a secondary concrete containment structure over the reactor vessel to prevent escape of radioactivity. In 1979, the containment structure at the Three Mile Island reactor did prevent the escape of a catastrophic amount of radioactivity after the core melted. But people living nearby were exposed to higher levels of radiation from the accident and deliberate venting to stabilize the reactor. With one hour, the multi-billion dollar investment in that plant went down the drain.

Meanwhile, let's hope that the core of the Japanese reactor can be cooled in time. We shouldn't need yet another major nuclear power accident to wake up the public and decision-makers to the fact that there are better and much safer ways to make electricity.

© 2011 Institute for Policy Studies

Robert Alvarez, an Institute for Policy Studies senior scholar, served as senior policy adviser to the Energy Department's secretary and deputy assistant secretary for national security and the environment from 1993 to 1999.

http://www.ips-dc.org

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Behind the Hydrogen Explosion at the Fukushima Nuclear Plant

by Karl Grossman

The explosion at the Fukushima nuclear power plant is being described as caused by a “hydrogen build-up” The situation harks back to the “hydrogen bubble” that was feared would explode when the Three Mile Island plant in 1979 underwent a partial meltdown

The hydrogen explosion problem at nuclear power plants involves a story as crazy as can be. As nuts as using nuclear fission to boil water to generate electricity is, the hydrogen problem and its cause cap the lunacy.

Eruption of hydrogen gas as a first reaction in a loss-of-coolant accident has been discussed with great worry in U.S. government and nuclear industry literature for decades.

That is because a highly volatile substance called zirconium was chosen back in the 1940’s and 50’s, when plans were first developed to build nuclear power plants, as the material to be used to make the rods into which radioactive fuel would be loaded.

There are 30,000 to 40,000 rods—composed of twenty tons of zirconium—in an average nuclear power plant. Many other substances were tried, particularly stainless steel, but only zirconium worked well. That’s because zirconium, it was found, allows neutrons from the fuel pellets in the rods to pass freely between the rods and thus a nuclear chain reaction to be sustained.

But there’s a huge problem with zirconium—it is highly volatile and when hot will explode spontaneously upon contact with air, water or steam.

The only other major commercial use of zirconium through the years has been in flashbulbs used in photography. A speck of it, on a flashbulb, ignites to provide a flash of light.

But in a nuclear plant, we’re not talking about specks—but tons and tons of zirconium, put together as a compound called “zircaloy” that clads tens of thousands of fuel rods.

Heat, a great deal of heat, builds up in a very short time with any interruption of coolant flow in a nuclear power plant—the problem at Fukushima after the earthquake that struck Japan.

Zirconium, with the explosive power, pound for pound, of nitroglycerine, will catch fire and explode at a temperature of 2,000 degrees Fahrenheit, well below the 5,000 degree temperature of a meltdown.

Before then, however, zirconium reacts to the heat by drawing oxygen from water and steam and letting off hydrogen, which itself can explode—and is said to have done so at Fukushima.

As a result of such a hydrogen explosion, there is additional heat—bringing the zirconium itself closer and closer to its explosive level.

Whether in addition to being a hydrogen explosion, zirconium also exploded at Fukushima remains to be known.

But what has happened regarding hydrogen at Fukushima, like the “hydrogen bubble” when the Three Mile Island plant in Pennsylvania underwent its near partial meltdown, is no mystery—but precisely what is expected in a loss-of-coolant accident.

It is described in U.S. government and nuclear industry accident studies as a “metal-water” reaction. It’s a reaction, the research has long stated, that can easily trigger a meltdown.

Using tons of a material otherwise used as the speck that explodes in a flashbulb in nuclear power plants —yes, absolutely crazy.

Moreover, in the spent fuel pools usually situated next to nuclear power plants, there are large numbers of additional fuel rods, used ones, disposed of as waste. There must be constant water circulation in the spent fuel pools. In what is labeled a “loss-of-water’ accident in a spent fuel pool, the zirconium cladding of the fuel rods is projected as exploding—sending into the environment the lethal nuclear poisons in a spent fuel pool.

http://www.commondreams.org/

Karl Grossman, professor of journalism at the State University of New York/College at Old Westbury, has long specialized in doing investigative reporting on nuclear technology. He is the author of Cover Up: What You Are Not Supposed to Know About Nuclear Power. He is the host of the nationally aired TV program, Enviro Close-Up (envirovideo.com).

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