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{{Short description|Long term storage for radioactive and hazardous waste}} A deep geological repository is a way of storing hazardous or radioactive waste within a stable geologic environment (typically 200–1000 m deep).WEB, The Geological Society of London - Geological Disposal of Radioactive Waste,weblink www.geolsoc.org.uk, 2020-05-15, 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. This will prevent any radioactive dangers.{{Citation needed|date=October 2022}} A number of mercury, cyanide and arsenic waste repositories are operating worldwide including Canada (Giant Mine) and Germany (potash mines in Herfa-Neurode and Zielitz)WEB, Underground disposal - K+S Aktiengesellschaft,weblink www.kpluss.com, en, 2020-05-15, and a number of radioactive waste storage sites are under construction with the Onkalo in Finland being the most advanced.

Principles and background

Highly toxic waste that cannot be further recycled must be stored in isolation to avoid contamination of air, ground and underground water. Deep geological repository is a type of long-term storage that isolates waste in geological structures that are expected to be stable for millions of years, with a number of natural and engineered barriers. Natural barriers include a water-impermeable (e.g. clay) and gas-impermeable (e.g. salt) layers of rock above and surrounding the underground storage. Engineered barriers include bentonite clay and cement.WEB,weblink NEA - Moving forward with geological disposal, 11 May 2017, 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.WEB,weblink Managing nuclear spent fuel: Policy lessons from a 10-country study, 27 June 2011, Bulletin of the Atomic Scientists, Harold Feiveson, Zia Mian, M.V. Ramana, Frank von Hippel, M.V. Ramana, Frank von Hippel, 13 March 2013, 26 April 2012,weblink" title="web.archive.org/web/20120426011518weblink">weblink dead, 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.WEB, US DOE - Radioactive waste: an international concern,weblink dead,weblink" title="web.archive.org/web/20060924002031weblink">weblink 24 September 2006, 11 May 2017, A storage space hundreds of metres below the ground needs to withstand the effects of one or more future glaciations with thick ice sheets resting on top of the rockweblink {{Bare URL PDF|date=March 2022}}NEWS,weblink Hot stuff, The Economist, 2 June 2012, 11 May 2017, The presence of ice sheets affects the hydrostatic pressure at repository depth, groundwater flow and chemistry, and the potential for earthquakes. This is being taken into consideration by organizations preparing for long-term waste repositories in Sweden, Finland, Canada and some other countries that also have to assess the effects of future glaciations.The Economist, ibidDespite 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 as result of anti-nuclear campaigns.Vandenbosch, Robert, and Susanne E. Vandenbosch. 2007. Nuclear waste stalemate. Salt Lake City: University of Utah Press. 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.{{see_also|High-level radioactive waste management}}

Natural radioactive repositories

Natural uranium ore deposits serve as proof of concept for stability of radioactive elements in geological formations — Cigar Lake Mine for example is a natural deposit of highly concentrated uranium ore located under sandstone and quartz layer at depth of 450 m that is 1 billion years old with no radioactive leaks to the surface.WEB, 2015, Ensuring Safety: Multiple-Barrier System,weblink Nuclear Waste Management Organization, 2020-05-28, 2017-06-15,weblink dead, File:Loppusijoituskapseli.jpg|thumb|Swedish KBS-3KBS-3The 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.R. Naudet. 1976. The Oklos nuclear reactors: 1800 millions years ago. Interdisciplinary Science Reviews, 1(1) p.72-84. This is quite remarkable as ground water had ready access to the deposits and they were not in a chemically inert form, such as glass.{{Citation needed|date=July 2021}}

Research

File:Onkalo 2.jpg|thumb|upright|Pilot cave of Onkalo at final depth.]]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.WEB,weblink IAEA-TECDOC-1243, 11 May 2017, Major underground test facilities are listed below.{| class="wikitable sortable"

Nuclear repository sites

{| class="wikitable sortable" Cigéo (Centre Industriel de Stockage Géologique) |Bure, Meuse| high-level waste

Status of repository at certain sites

(File:Onkalo 2.jpg|thumb|Demonstration tunnel in Olkiluoto.)File:WIPP DoE 2014-05-15 5 15 Image lrg.jpg|thumb|On Feb. 14, 2014, at the (Waste Isolation Pilot Plant]], radioactive materials leaked from a damaged storage drum (see photo). Analysis of several accidents, by DOE, have shown lack of a "safety culture".Cameron L. Tracy, Megan K. Dustin & Rodney C. Ewing, Policy: Reassess New Mexico's nuclear-waste repository, Nature, 13 January 2016.)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.WEB, Swedish Nuclear Fuel and Waste Management Co., Final disposal nearing realization, Press release, 2007-09-28,weblink 2009-01-05, dead,weblink" title="web.archive.org/web/20090225155242weblink">weblink 2009-02-25,

Australia

There was a proposal for an international high level waste repository in AustraliaJOURNAL, Holland, I., 2002, Waste not want not? Australia and the politics of high-level nuclear waste, Australian Journal of Political Science, 37, 2, 283–301, 10.1080/10361140220148151, 154638890, and Russia.Disposition of high-level waste and spent nuclear fuel: The continuing societal and technical challenges. Washington, DC: National Academy Press. 2001. 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.

Canada

Giant Mine has been used as deep repository for storage of highly toxic arsenic waste in the form of powder. As of 2020 there is ongoing research to reprocess the waste into a frozen block form which is more chemically stable and prevents water contamination.WEB, The Remediation Project's Frozen Block Method,weblink Branch, Government of Canada; Indigenous and Northern Affairs Canada; Communications, 2009-06-04, www.aadnc-aandc.gc.ca, 2020-05-15,

Finland

The Onkalo site in Finland based on the KBS-3 technology, is the furthest along the road to becoming operational among repositories worldwide. Posiva started construction of the site in 2004. The Finnish government issued the company a licence for constructing the final disposal facility on 12 November 2015. {{As of|June 2019}} continuous delays mean that Posiva now expects operations to begin in 2023.

Germany

A number of repositories including potash mines in Herfa-Neurode and Zielitz have been already used for years for storage of highly toxic mercury, cyanide and arsenic waste. There is little debate in Germany regarding toxic waste in spite of the fact that unlike nuclear waste it does not lose toxicity with time.There is a debate about the search for a final repository for radioactive waste, accompanied by 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 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 2008WEB,weblink Problems at Germany's Asse II Nuclear Waste Repository, 11 May 2017, dead,weblink" title="web.archive.org/web/20090803003620weblink">weblink 3 August 2009, The repository for radioactive waste Morsleben is a deep geological repository for radioactive waste in the rock salt mine Bartensleben in Morsleben, in Saxony-Anhalt/Germany that was used from 1972 to 1998. Since 2003 {{convert|480000|m3|cuyd|abbr=on}} of salt-concrete has been pumped into the pit to temporarily stabilize the upper levels.

Sweden

Approval has been granted in January 2022 for construction of direct disposal facility using the KBS-3 technology on the site of Forsmark nuclear power plant.WEB, The Government approves SKB's final repository system {{!, Svensk Kärnbränslehantering|url=https://via.tt.se/pressmeddelande/the-government-approves-skbs-final-repository-system?publisherId=3236034&releaseId=3315025|access-date=2022-01-27|website=via.tt.se|language=sv}}

United Kingdom

The UK Government, in common with many other countries and supported by scientific advice, has identified permanent deep underground disposal as the most appropriate means of disposing of higher activity radioactive waste.Radioactive Waste Management (RWM) weblink was established in 2014 to deliver a Geological Disposal Facility (GDF) and is a subsidiary of the Nuclear Decommissioning Authority (NDA) weblink which is responsible for clean-up of the UK's historical nuclear sites. In 2022 Nuclear Waste Services (NWS) formed from the merger of RWM with the Low Level Waste Repository in Cumbria.A GDF will be delivered through a community consent-based process weblink, working in close partnership with communities, building trust for the long term and ensuring a GDF supports local interests and priorities.The policy is emphatic in requiring the consent of the people who would be living alongside a GDF and giving them influence over the pace at which discussions progress.The first Working Groups were established in Copeland weblink and Allerdale weblink in Cumbria during late 2020 and early 2021. These Working Groups have started the process of obtaining consent for hosting a GDF in their areas. These Working Groups are a critical step in the process to find a willing community and a suitable, feasible and acceptable site for a GDF. Allerdale withdrew from the process to select a deep waste repository site in 2023. NWS explained this decision in terms of there being insufficient extent of potentially suitable geology in which to undertake a site selection process.RWM continues to have discussions in a range of places across England with people and organisations who are interested in exploring the benefits of hosting a GDF. More Working Groups are anticipated to form across the country in the next year or two.Any proposal for a GDF will be evaluated against highly rigorous criteria weblink to ensure all safety and security tests are met.

United States

File:Nuclear waste locations USA.jpg|thumb|right|Yucca Mountain nuclear waste repositoryYucca Mountain nuclear waste repositoryThe Waste Isolation Pilot Plant (WIPP) in the United States went into service in 1999 by putting the first cubic metres of transuranic radioactive wasteWEB,weblink DOE Waste Isolation Pilot Plant Receives EPA Recertification, 11 May 2017,weblink" title="web.archive.org/web/20090423130233weblink">weblink 2009-04-23, dead, in a deep layer of salt near Carlsbad, New Mexico.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.WEB,weblink Earthquakes In The Vicinity Of Yucca Mountain, www.state.nv.us, 11 May 2017, 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."A New Era of Responsibility, The 2010 Budget, p. 65.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.Hebert, H. Josef. 2009. "Nuclear waste won't be going to Nevada's Yucca Mountain, Obama official says." Chicago Tribune. March 6, 2009, 4. WEB,weblink Nuclear waste won't be going to Nevada's Yucca Mountain, Obama official says - chicagotribune.com, Chicago Tribune, 2011-03-17, dead,weblink" title="web.archive.org/web/20110324074934weblink">weblink 2011-03-24, Accessed 3-6-09.In June 2018, the Trump administration and some members of Congress again began proposing using Yucca Mountain, with senators from Nevada raising opposition.NEWS, Congress works to revive long-delayed plan to store nuclear waste in Yucca Mountain,weblink USA Today, June 3, 2018, On February 6, 2020, U.S. President Donald Trump tweeted about a potential change of policy on plans to use Yucca Mountain in Nevada as a repository for nuclear waste.WEB,weblink Nevada, I hear you on Yucca Mountain and my Administration will RESPECT you! Congress and previous Administrations have long failed to find lasting solutions – my Administration is committed to exploring innovative approaches – I'm confident we can get it done!, Trump, Donald J., 2020-02-06, @realdonaldtrump, en, 2020-04-28, Trump's previous budgets have included funding for Yucca Mountain but, according to Nuclear Engineering International, two senior administration officials said that the latest spending blueprint will not include any money for licensing the project.WEB,weblink Trump withdraws support for Yucca Mountain - Nuclear Engineering International, www.neimagazine.com, 2020-04-28, On February 7, Energy Secretary Dan Brouillette echoed Trump's sentiment and stated that the US administration may investigate other types of [nuclear] storage, such as interim or temporary sites in other parts of the country.WEB,weblink Energy secretary announces coal research initiative, Frazin, Rachel, 2020-02-07, TheHill, en, 2020-04-28, Though no formal plan had solidified from the federal government, the private sector moved forward with their own plans. Holtec International submitted a license application to the Nuclear Regulatory Commission (NRC) for an autonomous consolidated interim storage facility (CISF) in southeastern New Mexico in March 2017. Similarly, Interim Storage Partners is also planning to build and operate a CISF in Andrews County, Texas. Meanwhile, other companies have indicated that they are prepared to bid on an anticipated procurement from the DOE to design a facility for interim storage of nuclear waste.WEB,weblink Deep Isolation Eyes DOE Procurement for Interim Storage Design, 2020-03-10, ExchangeMonitor, en-US, 2020-04-28, The NRC issued a licence for the Andrews County CISF in September 2021, however a group including the State of Texas petitioned for a court review of the licence, and in August 2023 the United States Court of Appeals for the Fifth Circuit ruled that the NRC does not have the authority from Congress to license such a temporary storage facility that is not at a nuclear power station or federal site, nullifying the purported license. The other New Mexico CISF is similarly being challenged in the United States Court of Appeals for the Tenth Circuit.NEWS,weblink Court annuls licence for Texas used fuel store, World Nuclear News, 30 August 2023, 3 September 2023, Deep Isolation, a corporation based in Berkeley, California,WEB, Our Story,weblink 2023-07-18, Deep Isolation, en-US, proposed a solution involving horizontal storage of radioactive waste canisters in directional boreholes, using technology developed for oil and gas mining. An 18" borehole can be directed vertically to the depth of several thousand feet in geologically stable formations, and then a horizontal waste disposal section of similar length can be created where waste canisters are stored before the borehole is sealed.WEB, Technology,weblink 2020-07-21, Deep Isolation, en-US,

See also

• Journey to the Safest Place on Earth
• List of nuclear waste treatment technologies
• Waste Isolation Pilot Plant
• Nuclear semiotics

References

{{reflist|30em}}

External links

• Study by the World Nuclear Organization {{Webarchive|url=https://web.archive.org/web/20121002145103weblink |date=2012-10-02 }}
• Sandia Report Granite Disposal of U.S. High-Level Radioactive Waste
• Sandia Report Salt Disposal of Heat-Generating Nuclear Waste

{{Deep geological repositories}}