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Ocean disposal of radioactive waste

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From 1946 through 1993, thirteen countries used ocean disposal or ocean dumping as a method to dispose of nuclear/radioactive waste. The waste materials included both liquids and solids housed in various containers, as well as reactor vessels, with and without spent or damaged nuclear fuel.[1] Since 1993, ocean disposal has been banned by international treaties. (London Convention (1972), Basel Convention, MARPOL 73/78)

"Ocean floor disposal" (or sub-seabed disposal)—a more deliberate method of delivering radioactive waste to the ocean floor and depositing it into the seabed—was studied by the United Kingdom and Sweden, but never implemented.[2]

History

Data are from IAEA-TECDOC-1105,[1] pages 3–4.

  • 1946 First dumping operation at Northeast Pacific Ocean (about 80 km off the coast of California)
  • 1957 First IAEA Advisory Group Meeting on Radioactive Waste Disposal into the Sea
  • 1958 First United Nations Conference on the Law of the Sea (UNCLOS I)
  • 1964 On the 21 April, a satellite failed carrying a SNAP-9A radiothermal generator. 17,000 Ci (630 TBq) plutonium metal fuel burned up.[3]
  • 1972 Adoption of the Convention on the Prevention of Marine Pollution by Dumping of Wastes and Other Matter (London Convention 1972)
  • 1975 The London Convention 1972 entered into force (Prohibition of dumping of high level radioactive waste.)
  • 1978 On the 24 January a satellite named Kosmos 954 failed. It was powered by a liquid sodium–potassium thermionic converter driven by a nuclear reactor containing around 50 kilograms (110 lb) of uranium-235.
  • 1983 Moratorium on low-level waste dumping
  • 1988 Assessing the Impact of Deep Sea Disposal of Low-level Radioactive Waste on Living Marine Resources. IAEA Technical Reports Series No. 288
  • 1990 Estimation of Radiation Risks at Low Dose. IAEA-TECDOC-557
  • 1993 Russia reported the dumping of high level nuclear waste including spent fuel by former USSR.
  • 1994 (February 20) Total prohibition of disposal at sea came into force

1946–1993

Data are from IAEA-TECDOC-1105.[1] Summary of pages 27–120:

Disposal projects attempted to locate ideal dumping sites based on depth, stability and currents, and to treat, solidify and contain the waste. However, some dumping only involved diluting the waste with surface water, or used containers that imploded at depth. Even containers that survived the pressure could physically decay over time.

Country total at the major site. SU: Soviet Union (39,243 TBq) and Russia (2.8v TBq), GB: UK (35,088 TBq), CH: Switzerland (4,419 TBq), BE: Belgium (2,120 TBq). US: United States of America (3,496 TBq), JP: Japan (15TBq), KR: South Korea (?TBq), NZ: New Zealand (1+TBq). France (354 TBq), Germany (0.2 TBq), Italy (0.2 TBq), the Netherlands (336 TBq), and Sweden (3.2 TBq) are within the GB marker.

The countries involved – listed in order of total contributions measured in TBq (TBq=1012 becquerel) – were the Soviet Union, the United Kingdom, Switzerland, the United States, Belgium, France, the Netherlands, Japan, Sweden, Russia, New Zealand, Germany, Italy and South Korea. Together, they dumped a total of 85,100 TBq (85.1x1015 Bq) of radioactive waste at over 100 ocean sites, as measured in initial radioactivity at the time of dump.

For comparison:

  • Global fallout of nuclear weapon tests – 2,566,087x1015 Bq.[4]
  • 1986 Chernobyl disaster total release – 12,060x1015 Bq.[5]
  • 2011 Fukushima Daiichi nuclear disaster, estimated total 340x1015 to 780x1015 Bq, with 80% falling into the Pacific Ocean.[6]
  • Fukushima Daiichi nuclear plant cooling water dumped (leaked) to the sea – TEPCO estimate 4.7x1015 Bq, Japanese Nuclear Safety Commission estimate 15x1015 Bq,[7] French Nuclear Safety Committee estimate 27x1015 Bq.[8]
  • Naturally occurring Potassium 40 in all oceans – 14,000,000x1015 Bq.[9]
  • One container (net 400 kg) of vitrified high-level radioactive waste has an average radioactivity of 4x1015 Bq (Max 45x1015 Bq).
Ocean dumping of radioactive waste 1946–1993
Country dumped (unit TBq=1012 Bq） period num of sites, volume, etc.*
Arctic Atlantic Pacific Total
 Soviet Union 38,369 0 874 39,243 1959–1992[10] Arctic 20 sites, 222,000 m3 and reactor w or w/o spent fuel; Pacific Ocean (mainly sea of Japan) 12 sites, 145,000 m3
 UK 0 35,088 0 35,088 1948–82 NE Atlantic 15 sites, unknown number of containers, 74,052 tons and 18 sites off coast of British isles more than 9.4 TBq
  Switzerland 0 4,419 0 4,419 1969–1982 NE Atlantic 3 sites, 7,420 containers, 5,321 tons
 USA 0 2,942 554 3,496 1946–70 Mid/NW Atlantic (9), Gulf of Mexico (2) total 11 sites, 34,282 containers, unknown quantity; Mid/NE Pacific Ocean, total of 18 sites, 56,261 containers, ? tones
 Belgium 0 2,120 0 2,120 1960–1982 NE Atlantic 6 sites, 55,324 containers, 23,100 tons
 France 0 354 0 354 1967–1969 NE Atlantic 2 sites, 46,396 containers, 14,300 tons
 Netherlands 0 336 0 336 1967–1982 NE Atlantic 4 sites, 28,428 containers, 19,200 tons
 Japan 0 0 15.08 15.08 1955–1969 South of Honshu, 6 sites 15 times, 3,031 containers, 606,000 m3
 Sweden 0 3.2 0 3.2 1959,61,69 Baltic sea 1 site, 230 containers, 64 tons; NE Atlantic 1 site, 289.5 containers, 1,080 tons,
 Russia 0.7 0 2.1 2.8 1992–93 Arctic 3,066 m3; Pacific Ocean 6,327 m3
 New Zealand 0 0 1.04 1.04 1954–1976 East coast of New Zealand, 4 sites, 9 containers, 0.62 m3
 Germany 0 0.2 0 0.2 1967 NE Atlantic 1 site once, 480 containers, 185 tons
 Italy 0 0.2 0 0.2 1969 NE Atlantic 1 site, 100 containers, 45 tons
 South Korea 0 0 no data 1968–1972 Sea of Japan, 1 site 5 times?, 115 container, 45 tons
Total 38,369 45,262 1,446 85,077 Subtotal of all volume reported is 982,394 m3.
*Some countries report the mass and volume of disposed waste and some just tonnage. The US did not report tonnage or volume of 90,543 containers.

Types of waste and packaging

Data are from IAEA-TECDOC-1105.[1]: 6–7, 14 

Liquid waste

  • unpackaged and diluted in surface waters
  • contained in package but not solidified

Solid waste

  • low level waste like resins, filters, material used for decontamination processes, etc., solidified with cement or bitumen and packaged in metal containers
  • unpackaged solid waste, mainly large parts of nuclear installations (steam generators, pumps, lids of reactor pressure vessels, etc.)

Reactor vessels

  • without nuclear fuel
  • containing damaged spent nuclear fuel solidified with polymer agent
  • special container with damaged spent nuclear fuel (icebreaker Lenin by the former Soviet Union)
Ocean disposal (unit TBq = 1012 Bq)
Waste type Atlantic Pacific Ocean Arctic total note
Reactors with spent fuel Nil Nil 36,876 36,876
Reactors w/o fuel 1,221 166 143 1,530
Low level solid 44,043 821 585 45,449
Low level liquid <0.001 459 765 1,223
Total 45,264 1445 38,369 85,078

Dump sites

Data are from IAEA-TECDOC-1105.[1]: 27–120 

Arctic

Mainly at the east coast of Novaya Zemlya at Kara Sea and relatively small proportion at Barents Sea by the Soviet Union. Dumped at 20 sites from 1959 to 1992,[10] total of 222,000 m3 including reactors and spent fuel.

Arctic Ocean dump sites of radioactive waste. SU: Soviet Union (38,369 TBq), RU: Russia (0.7 TBq), SE: Sweden.

North Atlantic

Dumping occurred from 1948 to 1982. The UK accounts for 78% of dumping in the Atlantic (35,088 TBq), followed by Switzerland (4,419 TBq), the United States (2,924 TBq) and Belgium (2,120 TBq). Sunken Soviet nuclear submarines are not included; see List of sunken nuclear submarines

There were 137,000 tonnes dumped by eight European countries. The United States reported neither tonnage nor volume for 34,282 containers.

B: Belgium (2,120 TBq), F: France (354 TBq), D: Germany (0.2 TBq), I: Italy (0.2 TBq), N: the Netherlands (336 TBq), S: Sweden (3.2 TBq), C: Switzerland (4,419 TBq), G:United Kingdom (35,088 TBq), US: United States (2,942 TBq), SU: Soviet Union.

Pacific Ocean

The Soviet Union 874 TBq, US 554 TBq, Japan 606.2 Tonnes, New Zealand 1+ TBq. 751,000 m3 was dumped by Japan and the Soviet Union. The United States reported neither tonnage nor volume of 56,261 containers.

Dumping of contaminated water at the 2011 Fukushima nuclear accident (estimate 4,700–27,000 TBq) is not included.

JP: Japan (15.1 TBq), KR: South Korea (? TBq), NZ: New Zealand (1+ TBq), RU: Russia (2.1 TBq), SU: Soviet Union (874 TBq), US: United States (554 TBq)

Sea of Japan

The Soviet Union dumped 749 TBq. Japan dumped 15.1 TBq south of main island. South Korea dumped 45 tonnes (unknown radioactivity value).

Dump sites in the Sea of Japan. Sites off coast of Nakhodka are of the Soviet Union and Russia.

Environmental impact

Data are from IAEA-TECDOC-1105.[1]: 7 

Arctic Ocean

Joint Russian-Norwegian expeditions (1992–94) collected samples from four dump sites. At immediate vicinity of waste containers, elevated levels of radionuclide were found, but had not contaminated the surrounding area.

North-East Atlantic Ocean

Dumping was undertaken by UK, Switzerland, Belgium, France, the Netherlands, Sweden, Germany and Italy. IAEA had been studying since 1977. The report of 1996, by CRESP suggests measurable leakages of radioactive material, and, concluded that environmental impact is negligible.

North-East Pacific Ocean, North-West Atlantic Ocean dump sites of USA

These sites are monitored by the United States Environmental Protection Agency and US National Oceanic and Atmospheric Administration. So far, no excess level of radionuclides was found in samples (sea water, sediments) collected in the area, except the sample taken at a location close to disposed packages that contained elevated levels of isotopes of caesium and plutonium.

North-West Pacific Ocean dump sites of the Soviet Union, Japan, Russia, and Korea

The joint Japanese-Korean-Russian expedition (1994–95) concluded that contamination resulted mainly from global fallout.

See also

References

  1. ^ a b c d e f IAEA TECDOC-1105 “Inventory of radioactive waste disposals at sea” August 1999 retrieved 2011-12-4
  2. ^ World Nuclear Association “Storage and Disposal Options” retrieved 2011-11-14
  3. ^ Rääf, C; Holm, E; Rabesiranana, N; Garcia-Tenorio, R; Chamizo, E (2017). "On the presence of plutonium in Madagascar following the SNAP-9A satellite failure". J Environ Radioact. 177: 91–99. doi:10.1016/j.jenvrad.2017.06.011. PMID 28628779.
  4. ^ UNSCEAR "Exposures of the public and workers from various sources of radiation"
  5. ^ UNSCEAR "Health effects due to radiation from the Chernobyl accident"
  6. ^ Steinhauser, Georg; Brandl, Alexander; Johnson, Thomas E. (2014). "Comparison of the Chernobyl and Fukushima nuclear accidents: A review of the environmental impacts". Science of the Total Environment. 470–471: 800–817. Bibcode:2014ScTEn.470..800S. doi:10.1016/j.scitotenv.2013.10.029. PMID 24189103.
  7. ^ Japan Atomic Industrial Forum Inc(JAIF) "Earthquake-report 250 (30 October 2011)" Archived 20 December 2011 at WebCite retrieved 2011-11-12
  8. ^ Mainichi Shimbun "Cesium-137 flow into sea 30 times greater than stated by TEPCO report (29 October 2011)" Archived 31 October 2011 at the Wayback Machine retrieved 2011-11-12
  9. ^ Idaho State University "Radiation Information Network's Radioactivity in Nature"
  10. ^ a b Although the USSR dissolved in 1991, IAEA reported dumping of USSR in 1992.
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