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 →
Nuclear power plants’ reactor pressure vessels (RPVs)—the massive steel jars that hold a nuclear plant’s fissioning fuel—face incessant abuse from their radioactive contents. And they must be built with extra toughness to withstand pressure and temperature swings in the event of a loss-of-cooling accident like the one that occurred at Fukushima in 2011. As the triple meltdowns at Fukushima Daiichi showed, the next layer of defense against a nuclear release—the so-called containment vessels—can not be counted on to actually contain molten nuclear fuel that breaches the RPV.
Nuclear safety authorities have recently discovered weaknesses in several RPVs, and their contrasting responses suggest that the ultimate lessons from Fukushima are still sinking into international nuclear power culture—especially in the United States, where the Nuclear Regulatory Commission (NRC) is resisting calls to mandate tougher inspection of RPVs. Continue reading →
A bad year for nuclear power producers has Belgians and Britons shivering more vigorously as summer heat fades into fall. Multiple reactor shutdowns in both countries have heightened concern about the security of power supplies when demand spikes this winter.
In Belgium, rolling blackouts are already part of this winter’s forecast because three of the country’s largest reactors — reactors that normally provide one-quarter of Belgian electricity — are shut down. Continue reading →
After months of negotiation, the French government has unveiled a long-awaited energy plan that is remarkably true to its election promises. The legislation’s cornerstone is the one-third reduction in the role of nuclear power that President François Hollande proposed on the campaign trail in 2012.
Under the plan, nuclear’s share of the nation’s power generation is to drop from 75 percent to 50 percent by 2025, as renewable energy’s role rises from 15 percent today to 40 percent to make up the difference. That is a dramatic statement for France, which is the world’s second largest generator of nuclear energy, after the United States. France has a globally-competitive nuclear industry led by state-owned utility Electricité de France (EDF) and nuclear technology and services giant Areva. Continue reading →
Government incentives for a pair of proposed nuclear reactors could cost U.K. taxpayers as much as £17.62 billion, thus exceeding the reactors’ projected cost. The EC figure is a preliminary estimate included in an initial report to London published on Friday by European Commission competition czars. The letter notifies the British government that—as we predicted in December—Brussels is launching a formal investigation to assess whether the subsidies violate European state aid rules.
The preliminary findings suggest that the U.K. and E.C. are on a collision source. As the Financial Times summed it up this weekend: “The severity of [the EC’s] initial concerns will cast a shadow over government hopes to win approval for the deal.”
The Society of Environmental Journalists’ Miami conference energy tour forged forward today, pursuing better understanding of South Florida’s energy options in spite of a disinvitation by local nuclear reactor operator Florida Power & Light. Continue reading →