nuclear-news

Nuclear power plants can’t cope with increasingly hot summers

simply getting permission to suck in hotter water does not make the problem go away..

despite a myriad of potential problems and two decades of climate warnings, it is sobering to note that none of the US reactors were built to account for any of this

[The new reactors] they are still PWRs and they still require a large reserve of cool, circulating water to keep them operating and nominally safe. 

For Nuclear Power This Summer, It’s Too Darn Hot, Truth Out, 05 August 2012   By Gregg Levine,   You know that expression, “Hotter than July?” Well, this July, July was hotter than July. Depending on what part of the country you live in, it was upwards of three degrees hotter this July than the 20th Century average. Chicago, Denver, Detroit, Indianapolis and St. Louis are each “on a pace to shatter their all-time monthly heat records.” And “when the thermometer goes way up and the weather is sizzling hot,” as the Cole Porter song goes, demand for electricity goes way up, too….. Take, for example, Braidwood, the nuclear facility that supplies much of Chicago with electricity:

It was so hot last week, a twin-unit nuclear plant in northeastern Illinois had to get special permission to continue operating after the temperature of the water in its cooling pond rose to 102 degrees.
It was the second such request from the plant, Braidwood, which opened 26 years ago. When it was new, the plant had permission to run as long as the temperature of its cooling water pond, a 2,500-acre lake in a former strip mine, remained below 98 degrees; in 2000 it got permission to raise the limit to 100 degrees.
The problem, said Craig Nesbit, a spokesman for Exelon, which owns the plant, is not only the hot days, but the hot nights. In normal weather, the water in the lake heats up during the day but cools down at night; lately, nighttime temperatures have been in the 90s, so the water does not cool.
But simply getting permission to suck in hotter water does not make the problem go away. When any thermoelectric plant (that includes nuclear, coal and some gas) has to use water warmer than design parameters, the cooling is less effective, and that loss of cooling potential means that plants need to dial down their output to keep from overheating and damaging core components. Exelon said it needed special dispensation to keep Braidwood running because of the increased demand for electricity during heat waves such as the one seen this July, but missing from the statement is that the very design of Braidwood means that it will run less efficiently and supply less power during hot weather…….

cites two instances from the hot summer of 2010–New Jersey’s Hope Creek nuclear station and Limerick in Pennsylvania each had to reduce output due to intake water that was too warm. In fact, cooling water problems at US thermoelectric generators were widespread along the Mississippi River during the hot, dry summer of 1988.

And the problem is clearly growing. Two months ago, a study published in Nature Climate Change predicted continued warming and spreading drought conditions will significantly reduce thermoelectric output in coming decades:

ites two instances from the hot summer of 2010–New Jersey’s Hope Creek nuclear station and Limerick in Pennsylvania each had to reduce output due to intake water that was too warm. In fact, cooling water problems at US thermoelectric generators were widespread along the Mississippi River during the hot, dry summer of 1988.

And the problem is clearly growing. Two months ago, a study published in Nature Climate Change predicted continued warming and spreading drought conditions will significantly reduce thermoelectric output in coming decades:….

despite a myriad of potential problems and two decades of climate warnings, it is sobering to note that none of the US reactors were built to account for any of this. . . because all American nuclear reactors predate these revelations. That is not to say nuclear operators haven’t had 20 years (give or take) to plan for these exigencies, but it is to say that, by-and-large, they haven’t. (Beyond, that is, as described above, simply lobbying for higher water temperature limits. That’s a behavior all too recognizable when it comes to nuclear operators and regulators–when nuclear plants can’t meet requirements, don’t upgrade the procedures or equipment, just “upgrade” the requirements.)

But, rather than using all this knowledge to motivate a transition away from nuclear power, rather than using the time to begin decommissioning these dinosaurs, nuclear operators have instead pushed for license extensions–an additional 20 years beyond the original 40-year design. And, to date, the Nuclear Regulatory Commission has yet to reject a single extension request.

And now the nuclear industry–with the full faith and credit of the federal government–is looking to double down on this self-imposed ignorance. The “Advanced Passive” AP1000 reactors approved earlier this year for Georgia’s Plant Vogtle (and on track for South Carolina, too) may be called “advanced,” but they are still PWRs and they still require a large reserve of cool, circulating water to keep them operating and nominally safe….

The government is offering $8.3 billion of financing for the Georgia reactors at rock-bottom rates, and with very little cash up front from the plant owners. There have already been numerous concerns about the safety of the AP1000 design and the economic viability of the venture; factor in the impact of climate change, and the new Vogtle reactors are pretty much the definition of “boondoggle”–a wasteful, pointless project that gives the appearance of value while in reality delivering none. It is practically designed to fail, leaving the government (read: taxpayers and ratepayers) holding the bag.

But as a too-darn-hot July ends, that’s the woo being pitched by the nuclear industry and its government sweethearts. Rather than invest the money in technologies that actually thrive during the long, hot days of summer, rather than invest in improved efficiency and conservation programs that would both create jobs and decrease electrical demand (and carbon emissions), rather than seizing the moment, making, as it were, hay while the sun shines, it seems the US will choose to bury its head in the sand and call it shade.

Nuclear power was already understood to be dirty, dangerous and absurdly expensive, even without the pressures of climate change. Far from being the answer to growing greenhouse gas emissions, the lifecycle of nuclear power–from mining and milling to transport and disposal–has turned out to be a significant contributor to the problem. And now, the global weirding brought on by that problem has made nuclear even more precarious–more perilous and more pricy–and so an even more pernicious bet. http://truth-out.org/news/item/10707-for-nuclear-power-this-summer-its-too-darn-hot

August 6, 2012 - Posted by Christina Macpherson | climate change, Reference, USA