Wednesday, March 16, 2011

Japan's Nuclear Plants GE Design Flaws Must Read

As an engineer myself, I can't believe I just read what I did. Mind you, you hardly need to be an engineer to see the absurdity of such a design. This is Madness!

It’s as if you put the oil tank or propane tank for your furnace right above the burner in your basement, so that if there was some problem with the furnace it would ignite the tank, or as if you put the gas tank of your car right above the engine, so that if you had an engine fire, it would explode the gas tank!

And who could be more fitting than Homer to illustrate this post?

The Idiocy and Hubris of Engineers: Will GE Get Whacked for the Catastrophic Failure of its Nuke Plants in Fukushima?
Dave Lindorff

GE, the company that boasts that it “brings good things to life,” was the designer of the nuclear plants that are blowing up like hot popcorn kernels at the Fukushima Dai-ichi generating plant north of Tokyo that was hit by the double-whammy of a 9.0 earthquake and a huge tsunami.

The company may escape tens or hundreds of billions of dollars in liability from this continuing disaster, which could still result in a catastrophic total meltdown of one or more of the reactors (as of this writing three of the reactors are reported to have suffered explosions and partial meltdowns, and all could potentially become more serious total meltdowns with a rupture of the reactor container), thanks to Japanese law, which makes the operator--in this case Tokyo Electric Power Co. (TEPCO) liable. But if it were found that it was design flaws by GE that caused the problem, presumably TEPCO or the Japanese government could pursue GE for damages.

In fact, the design of these facilities--a design which, it should be noted, was also used in 23 nuclear plants operating in the US in Alabama, Georgia, Illinois, Iowa, Massachusetts, Minnesota, Nebraska, New Jersey, New York, North Carolina, Pennsylvania and Vermont--appear to have included serious flaws, from a safety perspective.

The drawings of the plants in question, called Mark I Reactors, provide no way for venting hydrogen gas from the containment buildings, despite the fact that one of the first things that happens in the event of a cooling failure is the massive production of hydrogen gas by the exposed fuel rods in the core. This is why three of the nuclear generator buildings at Fukushima Dai-ichi have exploded with tremendous force blasting off the roof and walls of the structures, and damaging control equipment needed to control the reactors.

One would have thought that design engineers at GE would have thought about that fact, and provided venting systems for any hydrogen gas being vented in an emergency into the building. But no. They didn’t.

There is a worse problem though. Probably in an effort to keep the problem of nuclear waste hidden from the public, these plants feature huge pools of water up in the higher level of the containment building above the reactors, which hold the spent fuel rods from the reactor. These rods are still “hot” but besides the uranium fuel pellets, they also contain the highly radioactive and potentially biologically active decay products of the fission process--particularly radioactive Cesium 137, Iodine 131 and Strontium 90. (Some of GE's plants in the US feature this same design. The two GE Peach Bottom reactors near me, for example, each have two spent fuel tanks sitting above their reactors.) more

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