Deep geological repository
A deep geological repository is a radioactive waste repository excavated deep within a stable geologic environment (typically below 300 m or 1000 feet). It entails a combination of waste form, waste package, engineered seals and geology that is suited to provide a high level of long-term isolation and containment without future maintenance. The Waste Isolation Pilot Plant, under construction in the United States, only accepts transuranic waste for permanent disposition.
Principles and backgroundEdit
The most long-lived radioactive wastes, including spent nuclear fuel, must be contained and isolated from humans and the environment for a very long time. Disposal of these wastes in engineered facilities, or repositories, located deep underground in suitable geologic formations is seen as the reference solution. The International Panel on Fissile Materials has said:
It is widely accepted that spent nuclear fuel and high-level reprocessing and plutonium wastes require well-designed storage for periods ranging from tens of thousands to a million years, to minimize releases of the contained radioactivity into the environment. Safeguards are also required to ensure that neither plutonium nor highly enriched uranium is diverted to weapon use. There is general agreement that placing spent nuclear fuel in repositories hundreds of meters below the surface would be safer than indefinite storage of spent fuel on the surface.
However, even a storage space hundreds of metres below the ground might not be able to withstand the pressures of one or more future glaciations with thick sheets of ice resting on top of the rock, deforming it and creating internal strains. This is being taken into consideration by agencies preparing for long-term waste repositories in Sweden, Finland, Canada and some other countries that would have to expect a renewed ice age.
Common elements of repositories include the radioactive waste, the containers enclosing the waste, other engineered barriers or seals around the containers, the tunnels housing the containers, and the geologic makeup of the surrounding area.
The ability of natural geologic barriers to isolate radioactive waste is demonstrated by the natural nuclear fission reactors at Oklo, Gabon. During their long reaction period about 5.4 tonnes of fission products as well as 1.5 tonnes of plutonium together with other transuranic elements were generated in the uranium ore body. This plutonium and the other transuranics remained immobile until the present day, a span of almost 2 billion years. This is quite remarkable in view of the fact that ground water had ready access to the deposits and they were not in a chemically inert form, such as glass.
Despite a long-standing agreement among many experts that geological disposal can be safe, technologically feasible and environmentally sound, a large part of the general public in many countries remains skeptical. One of the challenges facing the supporters of these efforts is to demonstrate confidently that a repository will contain wastes for so long that any releases that might take place in the future will pose no significant health or environmental risk.
Nuclear reprocessing does not eliminate the need for a repository, but reduces the volume, the long-term radiation hazard, and long-term heat dissipation capacity needed. Reprocessing does not eliminate the political and community challenges to repository siting.
Deep geologic disposal has been studied for several decades, including laboratory tests, exploratory boreholes, and the construction and operation of underground research laboratories where large-scale in-situ tests are being conducted. Major underground test facilities are listed below.
|Belgium||HADES Underground Research Facility||Mol||plastic clay||223 m||in operation 1982|
|Canada||AECL Underground Research Laboratory||Pinawa||granite||420 m||1990–2006|
|Finland||Onkalo||Olkiluoto||granite||400 m||under construction|
|France||Meuse/Haute Marne Underground Research Laboratory||Bure||claystone||500 m||in operation 1999|
|Japan||Horonobe Underground Research Lab||Horonobe||sedimentary rock||500 m||under construction|
|Japan||Mizunami Underground Research Lab||Mizunami||granite||1000 m||under construction|
|Korea||Korea Underground Research Tunnel||granite||80 m||in operation 2006|
|Sweden||Äspö Hard Rock Laboratory||Oskarshamn||granite||450 m||in operation 1995|
|Switzerland||Grimsel Test Site||Grimsel Pass||granite||450 m||in operation 1984|
|Switzerland||Mont Terri Rock Laboratory||Mont Terri||claystone||300 m||in operation 1996|
|United States||Yucca Mountain nuclear waste repository||Nevada||tuff, ignimbrite||50 m||1997–2008|
|Argentina||Sierra del Medio||Gastre||granite||under discussion|
|Belgium||high-level waste||plastic clay||~225 m||under discussion|
|Canada||OPG DGR||Ontario||200,000 m3 L&ILW||argillaceous limestone||680 m||license application 2011|
|Canada||NWMO DGR||Ontario||spent fuel||siting|
|Finland||VLJ||Olkiluoto||L&ILW||tonalite||60–100 m||in operation 1992|
|Finland||Loviisa||L&ILW||granite||120 m||in operation 1998|
|Finland||Onkalo||Olkiluoto||spent fuel||granite||400 m||under construction|
|France||high-level waste||mudstone||~500 m||siting|
|Germany||Schacht Asse II||Lower Saxony||salt dome||750 m||closed 1995|
|Germany||Morsleben||Saxony-Anhalt||40,000 m3 L&ILW||salt dome||630 m||closed 1998|
|Germany||Gorleben||Lower Saxony||high-level waste||salt dome||proposed, on hold|
|Germany||Schacht Konrad||Lower Saxony||303,000 m3 L&ILW||sedimentary rock||800 m||under construction|
|Japan||Vitrified high-level waste||>300 m||under discussion|
|Korea||Gyeongju||Gyeongju||L&ILW||80 m||under construction|
|Sweden||SFR||Forsmark||63,000 m3 L&ILW||granite||50 m||in operation 1988|
|Sweden||Forsmark||spent fuel||granite||450 m||license application 2011|
|United Kingdom||high-level waste||under discussion|
|United States||Waste Isolation Pilot Plant||New Mexico||transuranic waste||salt bed||655 m||in operation 1999|
|United States||Yucca Mountain Project||Nevada||70,000 ton HLW||ignimbrite||200–300 m||proposed, canceled 2010|
The current situation at certain sitesEdit
The pit Asse II is a former salt mine in the mountain range of Asse in Lower Saxony/Germany, that was allegedly used as a research mine since 1965. Between 1967 and 1978 radioactive waste was placed in storage. Research indicated that brine contaminated with radioactive caesium-137, plutonium and strontium was leaking from the mine since 1988 but was not reported until June 2008
The repository for radioactive waste Morsleben is a deep geological repository for radioactive waste in the rock salt mine Bartensleben in Morsleben, in Lower Saxony/Germany that was used from 1972–1998. Since 2003 480,000 m3 (630,000 cu yd) of salt-concrete has been pumped into the pit to temporarily stabilize the upper levels. The salt dome is in a state of collapse.
The Waste Isolation Pilot Plant (WIPP) in the United States went into service in 1999 by putting the first cubic metres of transuranic radioactive waste in a deep layer of salt near Carlsbad, New Mexico.
There was a proposal for an international high level waste repository in Australia and Russia. However, since the proposal for a global repository in Australia (which has never produced nuclear power, and has one research reactor) was raised, domestic political objections have been loud and sustained, making such a facility in Australia unlikely.
In 1978 The U.S. Department of Energy began studying Yucca Mountain, within the secure boundaries of the Nevada Test Site in Nye County, Nevada, to determine whether it would be suitable for a long-term geologic repository for spent nuclear fuel and high-level radioactive waste. This project faced significant opposition and suffered delays due to litigation by The Agency for Nuclear Projects for the State of Nevada (Nuclear Waste Project Office) and others. The Obama Administration rejected use of the site in the 2009 United States Federal Budget proposal, which eliminated all funding except that needed to answer inquiries from the Nuclear Regulatory Commission, "while the Administration devises a new strategy toward nuclear waste disposal." On March 5, 2009, Energy Secretary Steven Chu told a Senate hearing the Yucca Mountain site is no longer viewed as an option for storing reactor waste.
In Germany, there is a political debate about the search for a final repository for radioactive waste, accompanied by loud protests, especially in the Gorleben village in the Wendland area, which was seen ideal for the final repository until 1990 because of its location in a remote, economically depressed corner of West Germany, next to the closed border to the former East Germany. After reunification, the village is now close to the center of the country, and is currently used for temporary storage of nuclear waste.
The process of selecting appropriate deep final repositories is now under way in several countries with the first expected to be commissioned some time after 2010. The Onkalo site in Finland is the furthest along the road to becoming operational, with waste burial currently scheduled to begin in 2020 (final approval is still missing). Sweden is also well advanced with plans for direct disposal of spent fuel, as its Parliament has decided that this is acceptably safe, using the KBS-3 technology.
The UK has been following the current path towards geological disposal since the 2008 Defra White Paper, entitled Managing Radioactive Waste Safely(MRWS). Unlike other developed countries the UK has placed the principle of voluntarism ahead of geological suitability. When seeking local council volunteers for stage 1 of the MRWS process only Allerdale and Copeland, within the county of Cumbria were volunteered by their councils. The same area that was previously examined and rejected in the 1990s. Stage 2 which was an initial unsuitability screening process was carried out by British Geological Survey (BGS) in 2010. This ruled out approximately 25% of the land area based on the presence of certain minerals and aquifers. There remains some controversy about this stage following accusations that the criteria were changed between the draft and final versions of this report, bringing the Solway Plain back into consideration, however the criteria were clearly published in the 2008 Defra White Paper, entitled Managing Radioactive Waste Safely (MRWS) 2 years prior to being applied.
In June 2012, the independent geologist advising the local West Cumbria MRWS Partnership group named three rock volumes that could be potentially suitable for geological disposal of nuclear waste. These are the Mercia Mudstone Group rocks between Silloth Abbeytown and Westnewton in North Cumbria, and the Ennerdale and Eskdale granites further south which lie within the Lake District National Park.
The decision on whether to proceed to the next stage was due to be taken in January 2013 by a group of seven councillors, forming the Executive of Allerdale and another seven from Copeland. The ten member cabinet of Cumbria County Council had a veto which would prevent the search continuing.
In January 2013, Cumbria county council used its veto power and rejected UK central government proposals to start work on a production reactor nuclear waste repository near the Lake District National Park. "For any host community, there will be a substantial community benefits package and worth hundreds of millions of pounds" said Ed Davey, Energy Secretary, but nonetheless, the local elected administrative and governing body voted 7-3 against research continuing, after hearing evidence from independent geologists that "the fractured strata of the county was impossible to entrust with such dangerous material and a hazard lasting millennia."
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