by GoIllini » Thu 13 Oct 2011, 12:09:58
The reactors are called gas reactors, and use helium instead of water. Instead of fuel rods, they use a hopper full of uranium seeded graphite balls.
One of the interesting things about "economic" peak oil (which looks suspiciously like EROEI/ROC peak oil, just phrased in terms of money, for the benefit of the energy-dynamics averse) Is that economies like China and India can apparently afford more expensive oil than "advanced" economies. This is because they create more value out of the oil they consume, while a country like the USA or Canada has an economy built around extracting as little value from oil as they possibly can. I have my doubts about how much longer china and india can continue growing, partly because their nominally "productive" economies are in large part based on servicing consumer economies, and consumer economies are doomed.[/quote]
I was a really pro-nuke guy before Fukushima, and I still stand by the fact that the western Reactor design allowed three simultaneous LOCAs to do only 1/3 the damage of Chernobyl in terms of strontium and cesium hitting the atmosphere and ocean, but now I am getting more pragmatic.
The world has 400 nuclear reactors. Once every 10,000 reactor years, we get a meltdown that takes out about 500-1000 square miles of land. In order for the US to meet all of its energy needs from nuclear, we'd need 1000 reactors, meaning a meltdown every decade.
From a land use perspective, assuming 10 strontium half-lives (I think it's 27 years?) of contamination, we're looking at a running total of 27 contaminated areas over 270 years and maybe 20,000 square miles of land taken out. This is fairly small relative to the solar industry and the environmental impact of coal.
But from a psychological perspective, the prospect of us losing 1000 square miles every decade to an unseen radioactive force is very scary and demoralizing to a lot of folks. Sorry, maam. You have to leave your house now because all that electricity you've been enjoying caused the area to become radioactive. Your great great great grandchildren might be able to move back here, but you have to give up your childhood home. Now imagine this happening perhaps a million times during a meltdown since many of our existing reactors are near somewhat densely populated suburban areas. (Indian Point, Dresden, Byron, Millstone, Salem, Oyster Creek all come to mind.)
Also, about ten reactors sit on the shores of the lower Great Lakes and a meltdown on Lake Huron or Michigan could contaminate pehaps 10% of the world's drinking water for 20 years if we get a Fukushima-like loss of civilization for a week. Statistically, this may not be a problem for the country. Psychologically, it would be devastating for millions of residents in Wisconsin, Michigan, and Illinois if there were a meltdown at Point Beach. Hundreds of thousands of acres of Wisconsin countryside getting made off-limits. No more swimming, boating, or drinking from Lake Michigan (or any of the lakes downstream for that matter) for 20 years. Worrying about how much radiation you've been exposed to.
When Chernobyl hit, it happened in the super-secret USSR. The country was a mess anyways, nobody complained, and we chalked it up to the misery of living in a communist state. Watching Japan, even with 1/3 as much off-site damage from three BWRs as 1 RMBK, we see what a nuclear meltdown looks like in a wealthy western country.
Now, helium cooled reactors might be safer from an operational standpoint, but that still doesn't cover the fact that we get a black swan every 10-20K reactor years as we saw at Fukushima. And helium-cooled still has the same problem that you need large-scale human intervention to keep the waste cool for 5-10 years, and if we lose civilization in an area of the country for a few weeks, we risk a meltdown.
I'm not saying we need to shut down existing reactors- maybe it might be a good idea to shut down Indian Point Reactor 3 since it sits on a fault line 30 miles from NYC on one of those most breathtaking sections of the Hudson River- but the focus needs to shift to fusion. Unlike the radioactive isotopes of iodine, cesium, and strontium, helium-4 just makes your voice sound funny for a short time before it dissipates into space.