Wednesday, August 28th, 2013

Time	Event
12:13p	US Electrical Grid On the Edge of Failure ananyo writes "Facebook can lose a few users and remain a perfectly stable network, but where the national grid is concerned, simple geography dictates that it is always just a few transmission lines from collapse, according to a mathematical study of spatial networks. The upshot of the study is that spatial networks are necessarily dependent on any number of critical nodes whose failure can lead to abrupt — and unpredictable — collapse. The warning comes ten years after a blackout that crippled parts of the midwest and northeastern United States and parts of Canada. In that case, a series of errors resulted in the loss of three transmission lines in Ohio over the course of about an hour. Once the third line went down, the outage cascaded towards the coast, cutting power to some 50 million people. The authors say that this outage is an example of the inherent instability the study describes. But others question whether the team's conclusions can really be extrapolated to the real world. 'The problem is that this doesn't reflect the physics of how the power grid operates,' says Jeff Dagle, an electrical engineer at the Pacific Northwest National Laboratory in Richland, Washington, who served on the government task force that investigated the 2003 outage." Read more of this story at Slashdot. (Comment on this)
1:30p	Vermont Yankee Nuclear Plant To Close In 2014 stomv writes "Vermont Yankee nuclear plant is to close in late 2014, about 20 years before its (extended) NRC operating permit expires in 2032. Vermont Yankee is a merchant plant, which means that it sells its energy and capacity on the open New England market. The three reasons cited by Entergy, the owner, for closing are: low natural gas prices, high ongoing capital costs of operating a single unit reactor, and wholesale market flaws which keep energy and capacity prices low and doesn't reward the fuel diversity benefits that nuclear provides." Read more of this story at Slashdot. (Comment on this)
11:47p	Fukushima Daiichi Water Leak Raised To Level 3 Severity AmiMoJo writes "Japan's nuclear regulators have raised the level of severity of the radioactive water leak from a tank at the Fukushima Daiichi nuclear plant. It is now a level-3 serious incident. The revision from level 1 is based on estimates of the volume of radioactive substances leaked. The International Atomic Energy Agency supports the revision. They say the tank leak can be assessed separately from the Fukushima Daiichi crisis as a level 3 incident. Japanese experienced a level-3 nuclear event in 1997 with the fire and explosions at a fuel reprocessing plant in Tokai Village, Ibaraki Prefecture. 37 workers there were exposed to the leaked radioactive substances." Read more of this story at Slashdot. (Comment on this)

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