UPDATE: NO NUCLEAR-RELATED EXPLOSION AT JAPANESE NUCLEAR PLANT
Saturday, March 12th, 2011I have to say this is some of the most shameful reporting I have seen in a major news outlet in my entire life. Multiple news outlets are reporting a “massive explosion” at the Fukushima nuclear power station in Japan. The implication being that there has been some kind of explosion within the reactor or that dangerous levels of radioactive fallout are present.
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The above CBS video starts off with footage of a very real and very dangerous fire that is burning out of control at an oil and gas refinery. At this time those flames do pose a very significant threat of producing a major explosion. There is some footage of the nuclear plant in the report as well and of billowing smoke that is being reported as an “explosion.”
In fact, this is not really an “explosion” in the normal sense of the word at all and it has nothing to do with the nuclear aspects of the plant. It appears to be the catastrophic failure of transformer equipment. Transformers are typically filled with large volumes of oil, which provides electrical insulation and helps to cool the transformer coils. If the transformer malfunctions, the oil can spill out or catch fire as a result of electrical arcs.
When the quake struck the power plant, it was producing electricity and many of the transformers were damaged. Transformer fires are known to produce large billowing clouds of smoke and sudden bursts of flames. The sudden eruption of fire may occur when the oil heats, either as a result of fire or a short circuit and eventually begins to boil. This will cause the oil to overflow the transformer and come out through vents. When this happens it immediately catches fire.
This is what is happening in this video. The transformer experiences a fault that causes it to overheat. Oil begins to burn slowly, but notice that after several seconds the oil has become so heated that it begins to spray out the top of the transformer. It ignites and creates a fireball.
This appears to be what happened at the Fukushima nuclear power station. Transformer fires can be very visually dramatic, but they’re also not terribly uncommon and because of this power plants are designed such that transformers are physically isolated from other important structures, assuring fire can be contained. While it may destroy the transformer, it is nothing that a power plant can’t handle. It poses no threat to the nuclear components of the power station.
UPDATED: A separate explosion, probably caused by hydrogen gas occurred within the reactor building but outside the containment structure of reactor number 1.
UPDATE: Additional information confirms that transformers have been damaged, this accounts for some of the reports of smoke and fires, however, reports also indicate that an explosion may have occurred as the result of hydrogen used to cool the generator coils at the plant. This explosion did not damage the nuclear reactors. Details are still sketchy.
UPDATE 2: Still no official word on whether there was indeed a localized hydrogen explosion. TEPCO reports all reactors appear to be in safe condition.
UPDATE 3:EPCO confirms white smoke seen at turbine building 1. Two workers injured, but extent is unknown. Appears to have been a relatively small explosion. TEPCO information indicates exact cause not known. Hydrogen explosion appears to be speculation at this point. May have also been a steam rupture.
UPDATE 4: Additional reports from Japanrse officials continue to point to hydrogen as the likely cause of the explosion at the TEPCO plant. It seems that the explosion occurred in pumping equipment and may signal that there was some kind of thermal reaction between the zirconium alloy cladding and cooling water.
At this point the Unit-1 core may have sustained extreme damage and the unit appears to be a likely write-off. The plant sustained enormous damage from the huge earthquake. Damage to the core does not itself put the public in danger but it is expensive. Repairing the plant is going to take a long time.
UPDATE 4: (3:45 EST) Reports from NEI and other sources confirm an explosion occurred within the reactor building but outside the main containment structure. The explosion happened in a service area above the reactor’s containment structure. The reactor is still perfectly safe within multiple layers of containment and is not in danger of a major breach or any radiological incident.
Further reports are that the reactor experienced at least a partial uncovering of fuel and that cooling is now being provided by borated seawater which is being pumped directly into the reactor vessel.
It seems at this point that the utility is considering reactor-1 to be a write-off as seawater will contaminate the coolant loops and likely ruin the fuel core. It should be noted that while the plant has remained safe, it has endured billions of dollars worth of damage as a result of the earthquake and tsunami. The damage to Unit 1, the oldest unit at the facility, both the reactor and the support systems will likely preclude it from being brought back into service.
This is getting very bad (the reporting) and special interests and anti-nuke propaganda groups are coming out of the woodwork and being interviewed as “experts.” I urge readers to please contact news organizations and complain about the quality of this reporting. I have done so already, and while this kind of thing is not always effective, this is an extreme situation where pro-science activists need to mobilize.
To news organizations looking for real “experts” who can explain the workings of modern reactors and what is going on, some suggestions:



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