|The Week That Was
January 11, 2003
1. New On The Web: RESOLUTION IN DISPARITIES IN TEMPERATURE RECORDS.
A panel presentation by Fred Singer at the US Climate Change Science Program
(CCSP) workshop on Dec 4, 2002
2. AIR TRAVEL DOES NOT INCREASE CANCER RISK: German study of 6000 pilots and 20,000 crew.
3. CHERNOBYL SALVAGE OPERATION: Complicated but is it really necessary?
4. CHERNOBYL BOONDOGGLE? We consulted a noted radiation expert
5. CONCERN OVER DEPLETED URANIUIM IS MISPLACED
6. And finally: NEWLY DISCOVERED ELEMENT: GOVERNMENTIUM
2. Higher levels of cosmic rays do not increase risk of cancer
The German Medical Journal (Dec 2002) reports on a study by Maria Blettner and colleagues of the University of Bielefeld, Germany. They studied the records from 1953 to 1997 of 6000 Lufthansa pilots and over 20,000 crew and found them to be healthier than a matched control group of the same age. Lung-cancer rates were lower, leukemia about the same, breast cancer slightly higher (but not statistically significant).
The yearly additional radiation dose was 2 to 5 milliSievert (200 to 500 millirem), based on 600 to 900 flying hours. [The natural background at the surface is 1 mSv (or up to 2.9 mSv acc. to other estimates). A whole-body exposure of 1 Sv is considered as tolearbe, while >5 Sv is lethal.]
Source: SPIEGEL ONLINE - 20 Dec 2002
3. Putting a Lid on Chernobyl
200 Tons of Uranium Lie in Ruins of Derelict Reactor
Engineers are completing plans for what may be the largest movable structure ever built -- a 20,000-ton steel shell to enclose Chernobyl Reactor 4, site of an apocalyptic nuclear accident whose consequences are still being felt more than 16 years later.
By next summer an international consortium led by Bechtel International Systems Corp., of San Francisco, will finish the conceptual design for a hangar-shaped arch nearly 370 feet high -- the height of a 35-story building -- that would be slid into place along greased steel plates to cover the ruined remains in a snug, weather-tight shelter.
Inside, robotic cranes and, where possible, live workers will then begin prying apart the wreckage, removing radioactive dust from twisted girders, storing pieces of radioactive core in shielded canisters and cutting old steel into manageable lengths.
The whole job -- design, construction and "stabilization" of the derelict reactor 80 miles north of Kiev -- is part of a fully funded 10-year plan set in motion by the Group-of-7 industrialized nations in 1997. The $768 million project, including the shell, is scheduled for completion in 2007, according to officials involved with the project.
And then the world will wait. The shelter is designed to keep water out and dust in for 100 years, or for as long as it takes the Ukrainian government to designate a permanent storage facility and dispose of more than 200 tons of uranium and nearly a ton of lethally radioactive plutonium that remain inside the ruins.
Most of the fuel-containing material lies as a solid "lava" formed by the fusion of molten fuel, concrete, 30 tons of fuel dust and 2,000 tons of combustibles. In the basement, rainwater and fuel dust have mixed together in a dangerous radioactive "soup." Lethal chunks of the reactor core lie unseen in the rubble and in the earth alongside the building. More pieces of core were boxed and buried in a "cascade wall" built and bulldozed into place by Soviet workers in the immediate aftermath of the explosion. "We will need a lot of shielding," said Vincent Novak, director of the Nuclear Safety Department for the European Bank for Reconstruction and Development, overseers of the project. "If it weren't for the radioactivity, I could almost call the job 'a piece of cake,' but the radiation makes it hugely complex and extremely difficult."
The Chernobyl explosion occurred April 26, 1986, when an out-of-control nuclear reaction blew off the roof of the steel building and spewed tons of radioactive material into the air, releasing 30 to 40 times as much radioactivity as the Hiroshima and Nagasaki atomic bombs combined in 1945. It was the worst nuclear accident in history. Thirty workers died immediately at the facility, and 135,000 people were evacuated from the surrounding "Exclusion Zone." As recently as 2000, the Ukraine government was spending 5 percent of its gross domestic product to mitigate consequences of the disaster.
In the six months immediately following the explosion, the Soviets erected an improvised shelter known as the "sarcophagus," but within 10 years scientists became alarmed because of leaks and the building's threatened collapse. The walls were weakening, Novak said, and there was tremendous uncertainty because "it was almost impossible to determine" the real angers. In 1997, the Group of 7, plus Russia, the European Union and Ukraine, set up the Chernobyl Shelter Fund with the European Reconstruction Bank in charge. The Bank established a shelter implementation plan, estimated the project cost at $768 million, and funded it with donations from 28 nations, ranging from $170 million from the United States to Iceland's $10,000.
In the first phase, completed in 1999, the sarcophagus's roof and structural pillars were strengthened, and the reactor's rickety ventilation stack, jutting more than 150 feet above the sarcophagus, was stabilized. The stack was an added concern, because it was shared by the contiguous Reactor No. 3, which was still operating.
But these were emergency measures. "Safety analyses show there are still about 1,000 square meters [1,200 square yards] of holes in the roof and sides," said Eric Schmieman, chief engineer for environmental technology at Battelle Memorial Institute's Pacific Northwest National Laboratory in Richland, Wash. "A significant amount of water can go in, and dust can go out, and birds and squirrels and birds come and go all the time."
[Do they glow in the dark?]
The Bechtel-led consortium designing the $250 million structure to cover the sarcophagus had to make several decisions early. None of the three design contractors, including Battelle and the French state utility Electricite de France, will be allowed to bid on the actual work. Doubts arose as to whether a steel structure could last a century. With lethal levels of radiation inside the shell, opportunities for repair and maintenance could be limited. "It's doable," said Bechtel's Matthew Wrona, project manager. "There are paints that last a long time and maintenance techniques for harsh environments." The Eiffel Tower is perhaps the best-known large, century-old steel structure fully exposed to the elements, but Wrona noted that several large suspension bridges are aging elegantly. The team also avoided experimental technologies in favor of the tried and true.
"We're trying to build it for 100 years, and using brand-new technologies increases the risks," Schmieman said. "If a human being has to intervene, there's a consequence. We need to minimize the danger."
The team settled on a steel arch 40 feet thick. The inside dimensions would be 803 feet -- almost three football fields -- across and 330 feet high. Up to that point, planning was relatively simple, because "it had all been done before," said Philippe Convert, technical manager for Electricite de France, but the next steps were a different story: Lethal gamma rays escaping from the reactor's damaged core would make the center of the arch too hot for humans to work. Building the arch in place was impossible. Instead, the team decided to construct the arch in four 120-foot sections, then link the sections together and slide the entire structure along a track made of steel plates built on each side of Reactor No. 4. When completed, the project managers believe the new shelter will be the largest movable structure ever built.
One end will be fully enclosed, while the other will be a "cutout" that fits snugly over Reactor No. 3's building, which connects to the ruins. Current plans call for the stack to be taken down, and the junction between the arch wall and Reactor No. 3 to be sealed. The new shelter will not "contain" the core's radioactivity but will be weatherproof. The tracks will be made by driving piles into the ground at relatively close intervals, then filling the gaps with concrete. The planners want to avoid seating the concrete in a deep trench, for fear of unearthing radioactive material during excavation. The concrete will then be covered with stainless steel plates and coated with a lubricant, while the bottom of the new steel shell will have Teflon pads for easier sliding. Convert said the sliding technique is used extensively to move heavy machinery. While workers will be able to enter some parts of Reactor No. 4 and work on the wreckage in relative safety, the most routine tasks can suddenly turn deadly.
"Surprises are inevitable," Novak said. During the initial roof and structural repair, "we found a large piece of core embedded in the wall. Everything stopped until we could build a device and get the shielding to handle it. Each case is different." To help deconstruct parts of the reactor building and the sarcophagus, the new shell will have four ceiling cranes designed to pluck heavy steel beams from the old reactor and to wrestle pieces of twisted metal from the ruins. They will also be equipped with hydraulic cutters to chop wreckage into manageable chunks.
One unusual problem is the need to manage the new shell's microclimate. "It's so big, it could even rain inside, so we have to keep the moisture down," Wrona said. Air conditioning would be prohibitively expensive, so "we'll try to use natural air currents. It's like the inside of an automobile on a cold morning."
SEPP Comment: A breathlessly overblown account portraying imminent danger, demanding impossibly difficult, risky, and expensive technological solutions
4. CHERNOBYL BOONDOGGLE: Letter from Dr Zbigniew Jaworowski confirming the over-reaction we suspected
To me this is just one of many examples of "the West empathetically helping to mitigate the results of eastern imbecility". The peculiarity of a bit condescending empathy (I observed it directly during an almost 10-year stay in Scandinavia) is that most of the western money spent for such noble aims lands finally in the West, in this case in San Francisco, Richland, Wash. and Paris, and their subcontractors. Besides $768 million there will be a huge publicity that counts.
Most of uranium and plutonium is immobilized in the melted corium, or "lava", and may stay there for ages. I do not see any sense in moving them now elsewhere.
During the past 15 years we observed from time to time in Poland a one-day increase of cesium-137 air activity caused by resuspension of Chernobyl stuff in Ukraine. This means that concentration of cesium-137 increases for about 1 day from its normal level of 2 - 4 microBq/cub.m to some 20 microBq/cub.m, which corresponds to an increase in inhalation radiation dose of about 0.003 mSv. The [recommended] population limit is now 1 mSv/year, and protective action is recommended at 50 mSv/week. This probably reflects well the current danger.
If the roof over the remnants of reactor No. 4 is leaking, why not to put on top of existing structure a new stainless steel one, for small a fraction of $768 million? Why not to give this money to Ukrainians instead to western companies? Ukrainians certainly know how to weld the stainless steel. The Eiffel tower is protected against rusting every few years. How the designers imagine doing this inside their non-stainless steel structure where radiation is lethal, and where the condensation water will be a problem? Perhaps they plan to replace the structure every few decades, gaining similar money?
Zbigniew Jaworowski, Ph.D.
5. Radioactivity of depleted uranium poses no cancer risk
NATO aircraft shelled 112 locations in Kosovo in 1999 with 30,000 rounds of DU ammunition totaling about 9 tons, approx 300 gm per pencil-sized armor-piercing shell. [Uranium is 70% denser than lead.]. Also, the depleted U was said to contain plutonium and U-236, indicating that it might have been irradiated and reprocessed. After several cases of leukemia were reported, UNEP investigated in Nov 2000.
The report by P.R. Danesi, former director of the IAEA lab in Seibersdorf, Austria found no such evidence in soil samples and concluded that "DU does not represent a health threat." Radiochemist Corrado Testa of the University of Urbino, whose lab performed the tests, confirmed that there was "no risk from DU. " this is a false problem. We could be spending money on more urgent problems" -- toxic solvents, heavy metals, and organic pollutants, to name a few. He did not mention global warming - bless his soul.
6. Newly Discovered Element: Governmentium!
A major research institution has discovered the heaviest chemical element yet known to science. The new element, for now, has been named, "GOVERNMENTIUM."
GOVERNMENTIUM has 1 neutron, 12 assistant neutrons, 75 deputy neutrons and 11 assistant deputy neutrons, giving it an "atomic mess" of 312. These 312 particles are held together by forces called morons, hich are surrounded by vast quantities of lepton-like particles called peons. Since GOVERNMENTIUM has no electrons, it is inert. However, it can be detected and it impedes every reaction with which it comes into contact. The minutest amount of GOVERNMENTIUM can cause one reaction to take four to six weeks to complete when it would normally take less than one second.
GOVERNMENTIUM has a normal half-life of 4 years; it does not decay, but every four years undergoes a reorganization in which a portion of the assistant neutrons and deputy neutrons exchange places. In fact, governmentium's mass will actually increase over time, since each reorganization will cause some morons to become neutrons, forming isodopes. This characteristic of moron-promotion leads some scientist to speculate that GOVERNMENTIUM is formed whenever morons reach a certain quantity in concentration. This hypothetical quantity is referred to as "Critical Morass". You will know it when you encounter it. I don't know for sure, but I think we're there!
Contributed by a friend