The 25th anniversary of the Chernobyl explosion will occur later this month. The legacy involves crumbling communities, relentless expense, and years to go with recovery and monitoring (decades and centuries in some cases).
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The 25th anniversary of the Chernobyl explosion will occur later this month. The legacy involves crumbling communities, relentless expense, and years to go with recovery and monitoring (decades and centuries in some cases).
The 25th anniversary of the Chernobyl explosion will occur later this month. The legacy involves crumbling communities, relentless expense, and years to go with recovery and monitoring (decades and centuries in some cases).
The images of the nuclear power plants in Japan keep taking me back to Chernobyl.
This month is the 25th anniversary of the explosion and fire at Chernobyl early in the morning of April 26, 1986. As the problems in Japan get worse, I wonder what will happen when CNN and the world go away, the Tokyo Electric Power Company is nationalized, and we turn this over to the engineers and technocrats in Japan and in the world nuclear community.
The only real example we have is Chernobyl and a review of what has been done over the past 25 years offers a grim picture of the years to come in Japan, especially now that the Fukushima troubles have officially been put on the same level of severity as Chernobyl.
As part of the emergency response at Chernobyl, the then-Soviet government hastily completed in October of 1986 a steel and concrete structure that entombed the still hot pile. The pile contained 200 tons of radioactive material and close to a ton of radio-nuclides, unstable elements that emit powerful gamma rays for a long time. Many of the radio-nuclides at Chernobyl are plutonium, among the most dangerous materials that exist. Part of the Chernobyl plant’s mission was to supply the Soviet military with plutonium for nuclear weapons.
Around these materials are a crumbling sarcophagus, a legacy of abandoned communities, relentless expense, technical failure, amazing politics, and a numbing inertia. My recent story talked about Chernobyl’s heroism. This story is about the decades-long effort of trying to pick up Chernobyl and put it away.
According to the European Bank for Social Development, the administrator of a fund for stabilizing the Chernobyl site, the government of Ukraine, where the plant was located, was spending up to 5 percent of its Gross Domestic Product in the year 2000, 14 years after the accident, on the social, health, and environmental consequences of the explosion. Next door neighbor Belarus, down wind, was spending even an even higher percentage of its wealth on the disaster's consequences.
The Chernobyl-plant operators' town of Pripyat, population 45,000, closed the day after the accident and people were evacuated. By the middle of May, a zone 18 miles wide was established from which 116,000 people were relocated. In subsequent years, another 220,000 people were relocated and the exclusion zone extended from 1,680 square miles to 2,600.
In January 2008, the Ukraine government announced a decommissioning plan that includes repopulating some of the contaminated areas. The government sees the regional economy as driven by agriculture and forestry. Initial infrastructure requirements will include the refurbishing of gas, potable water, and power systems. The burning of local wood will be banned and the eating of some wild foods, like mushrooms, strongly discouraged.
More than 21,000 homes would be connected to gas networks in the period through 2015, while another 5,600 contaminated or broken down buildings are demolished. Over 1,300 kilometres of road and ten new sewage works and 15 pumping stations are planned. The feasibility of agriculture will be examined in areas where the presence of caesium-137 and strontium-90 is low, "to acquire new knowledge in the fields of radiobiology and radioecology in order to clarify the principles of safe life in the contaminated territories," the report says, somewhat ominously.
The World Health Organization has estimated that 1,000 people suffered substantial radiation exposure and 4,000 people will eventually die as a result of cancers, mainly thyroid, caused by fallout, about the same number of people who die annually in China mining coal. Many people dispute the WHO estimates. (Dr. Alexey Yablokov, a member of the Russian Academy of Sciences who puts the figure in the hundreds of thousands, spoke at a Seattle event recently sponsored by the World Affairs Council and Hanford Challenge.)
In the mid-1990s, the international community began to pressure Ukraine to shut the three remaining units in the complex because of design flaws with the plants and concerns about the stability of the sarcophagus surrounding Unit Four. But closing the plants was a tough sell as they created half the electricity for the country. After the fall of the Soviet Union, a series of disputes with Russia over natural gas made it difficult to pursue natural gas plants as replacement power. In response, Ukraine built three new pressurized-water reactors after its independence.
Meantime, the type of reactor that failed at Chernobyl, the RBMK (reaktor bolshoy moshchnosty kanalny) or high-power channel reactor, went through numerous upgrades of its safety technologies though the design still lacks a containment vessel, the part of the plant that saved the day at Three Mile Island. Today, 11 RBMK reactors are operating, all within the former Soviet Union. If current schedules are kept, the last four will be decommissioned in the 2020-2025 time frame.
As part of the negotiation, the international community committed to the decommissioning of the remaining reactors. That means stabilizing and storing the fuel rods of the now closed reactors, which have been sitting in their spent fuel pools for the better part of 15 years. The European Bank for Reconstruction and Development, working with money donated by several counties will supervise the decommissioning.
The rods are currently in water and other “wet” storage facilities, but will now be stored in dry cement casks, a technique called dry cask storage. The fuel rod assemblies will be dried and disassembled before being put in the closed casks. Sixteen donors are supporting this activity.
The contract to actually accomplish this task was signed last month. That’s right. Last month.
It was supposed to be done much earlier, but a contract let in 1999 to process the 25,000 fuel assemblies in the Chernobyl complex was cancelled in 2007 because technical difficulties emerged. Nearly all of the structures for this task were complete at the time of cancellation. The new contract calls for an interim spent fuel facility to be completed in 2014 with permanent facilities coming later.
If all goes well, the threat of Chernobyl to the world will be nearly over by 2015, though several activities will go on for the next 100 to 300 years. The vehicle for this accomplishment is called, in Europeonese, the New Self Confinement, which permanently seals the remains of the complex with a moveable dome, somewhat like the Safeco Field roof. It also covers a new Spent Fuel Storage Facility, the site where the spent fuel rods will be safely quarantined and where the structures will be disassembled and/or processed.
The dome will prevent water from intruding and dust, contaminated with cesium, from dispersing. It will deconstruct the existing structure which will be laid down within the site or processed inside it.
The design contract was signed in 2007 and the driving of the pilings for the foundations of two 50-ton-capacity cranes started in 2010. Construction will start in 2012 and the facility will operate for 100 years.
Last week, the Europeon Development Bank and its contractor, NOVARKA, a French and Europeon consortium run by the French construction firm VINCI, confirmed the schedule and the construction price of 1.5 billion Euro.
By even the most optimistic assessment, Japan's recovery will be long, expensive, and challenging.
