Readying refrigeration lines to create a 30-meter-deep frozen barrier against groundwater
Japan’s TEPCO is about to flip the switch on the infamous ‘ice wall’ intended to divert flowing groundwater around its crippled reactors at Fukushima and thus help stem the contamination of fresh groundwater at the site. The widely mischaracterized and maligned installation—which is a barrier of frozen soil rather than a wall of ice—has every chance of delivering the hoped for results, say radiation cleanup experts at U.S. national laboratories and feedback from initial system tests.
“The frozen barrier is going to work,” predicts Brian Looney, senior advisory engineer at the U.S. Department of Energy’s Savannah River National Laboratory in South Carolina and co-author of an independent assessment of TEPCO’s frozen barrier. The report, produced in collaboration with researchers at Looney’s lab and at Pacific Northwest National Laboratory, was completed in February but only released late last month; it found the system’s design to be sound and within the bounds of prior practice. Continue reading →
For those looking for hope amidst the nuclear threat afflicting post-Tsunami Japan, there are some glimmers of possibly positive developments to report from the Fukushima Daiichi nuclear power complex:
Japanese authorities say that water canons and aerial water drops from helicopters may have stabilized reactor 3 and its fuel pool (video below). Of Fukushima Daiichi’s six reactors this was viewed as the most dangerous Continue reading →
An explosion earlier today at Japan’s crippled Fukushima Daiichi nuclear power plant could indicate that the primary containment vessels protecting two of its reactors have now been breached. And yet, stunningly, that was not the day’s worst news. Instead concern increasingly focused on the plant’s highly radioactive spent fuel rods, stored in cooling pools above the reactors.
Damage sustained from last week’s massive earthquake and tsunami as well as subsequent fires and hydrogen explosions have critically limited plant operator Tokyo Electric Power’s ability to maintain cooling in several of the plants’ pools or even to replace water that is evaporating or boiling away. U.S. Nuclear Regulatory Commission chairman Gregory Jaczko told a Senate panel this afternoon that one of the pools was empty and that heating of the fuel bundles could thus melt them down—an outcome that could spread radioactive elements far beyond the site. Continue reading →
The Chinese Experimental Fast Reactor is so-named because the neutrons produced in its core are not ‘moderated’ with water like those that generate heat in nearly all commercial nuclear reactors. The faster neutrons can burn down nuclear waste and even generate new fuel, promising a solution to the thorny problem of waste storage as well as energy independence.
Over the last month Carbon-Nation went quiet as its editor made noise elsewhere on the web. He should have kept you linked in. Bad editor! Here’s what you missed:
“Cheap Cashmere Sweaters”: A Connect the Dots photo feature on MSN Green tracking cashmere’s environmental footprints –carbon and otherwise– back to the desertified steppes of Central Asia. Bottom line message: The price of that cashmere sweater looks good now, but the cost to the environment will bite you in the end.
Two for IEEE SpectrumOnline:
“Power Transmission Without the Power Electronics”: During their low-resolution beginnings digital music and photography delivered a jarring rendition of sounds and images. Today, digital devices used to control electricity flows are making a similar mess on power grids.
“Electric-Car Maker Touts 10-Minute Fill-Up”: Altair Nanotechnologies’ lithium ion batteries for electric vehicles charge up fast. Very fast. One of its 35 kilowatt-hour packs, capable of propelling an EV pickup truck for 160 kilometers, can fully charge in just 10 minutes-a feat that would be downright dangerous with most lithium batteries. But will such rapid-charging prove practical on the street?
And a troika for MIT’s Technology Review website:
“Prospecting for Power”: The ultra-sensitive detection of traces of helium rising from the Earth’s mantle may hold the key to sniffing out sites of hidden geothermal energy.
“Cleaner Nuclear Power?”: Senators representing several Western states are promoting thorium. They say it’s a cleaner-burning fuel for nuclear-power plants, with the potential to cut high-level nuclear-waste volumes in half. Some nuclear watchdogs agree.
“Carbon Capture Moves Ahead”: Carbon offsets marketer Blue Source is building the business case for carbon-capture and storage systems by storing CO2 in oil wells.
To consider nuclear power as a solution to climate change one must confront the legacy of high-level radioactive waste that is building up at power plants across the U.S. and Canada. This week the Las Vegas Review-Journal showed yet again how difficult it will be for regulators to bury the high-level waste problem while ensuring that waste remains safe for millenia to come.
The Review-Journal’s story on developments at the U.S. Department of Energy’s planned waste repositor at Yucca Mountain, Nevada — “Yucca fault line might spring surprise” — reveals that the site’s initial design would place a waste handling area atop a fault line capable of producing a magnitude 6+ earthquake. No wonder that the state of Nevada is fighting to block the repository’s construction, and that even the DOE concedes the repository won’t open for another decade.
Such risks and delays are one reason why the Bush Administration is pursuing nuclear waste reprocessing, in which the components of high-level nuclear waste are separated and reused. As I revealed in my Spectrum story on France’s nuclear waste reprocessing experience — “Nuclear Wasteland” — there are serious problems with this approach as well.