Nuclear power in Germany

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The Grafenrheinfeld Nuclear Power Plant in Germany, which was shut down in 2015 Nuclear plant at Grafenrheinfeld.jpg
The Grafenrheinfeld Nuclear Power Plant in Germany, which was shut down in 2015

Nuclear power was used in Germany from the 1960s until it was phased out in April 2023.

Contents

German nuclear power began with research reactors in the 1950s and 1960s, with the first commercial plant coming online in 1969. By 1990, nuclear power accounted for about a quarter of the electricity produced in the country.

The anti-nuclear movement in Germany has a long history dating back to the early 1970s and intensified following the Chernobyl disaster in 1986. [1] [2] [3] After the March 2011 Fukushima nuclear disaster and subsequent anti-nuclear protests, the government announced that it would close all of its nuclear power plants by 2022. [4] [5] Eight of the seventeen operating reactors in Germany were permanently shut down following Fukushima.

Nuclear power accounted for 13.3% of German electricity supply in 2021, [6] supplied by six power plants. Three of these were switched off at the end of 2021, and the other three ceased operations by April 2023. [7] [8]

History

Early nuclear research in Germany

Prior to the takeover of Nazi Germany, German universities were the employers of some of the world's most renowned nuclear physicists, including Albert Einstein, Otto Hahn, Lise Meitner, Leo Szilard, and others. In 1938, Hahn and his colleague Fritz Straßmann conducted an experiment designed by Lise Meitner (who had already been driven into exile due to her Jewish ancestry), which led to the discovery of nuclear fission. Soon thereafter, a "race" began between the soon-to-be belligerents of World War II to find military or civilian applications of the new technology. Hampered by infighting, lack of resources, mistakes, and the suspicion of Nazi authorities against "Jewish physics", the Uranverein ("uranium club") led by Werner Heisenberg never got close to building a Uranmaschine ("uranium machine"—what the Americans called a "pile") that achieved criticality, let alone building a nuclear weapon. When the Americans took over the last German attempt at a research reactor during the war at Haigerloch in southwestern Germany, it was clear to the people involved in the Alsos Mission that Germany had fallen behind the Manhattan project to a considerable degree. [9]

First nuclear power plants

As in many industrialised countries, nuclear power in Germany was first developed in the late 1950s. Only a few experimental reactors went online before 1960, and an experimental nuclear power station in Kahl am Main opened in 1960. All of the German nuclear power plants that opened between 1960 and 1970 had, as in the rest of the world at that time, a power output of less than 1,000 MW and have now all closed down. The first almost fully commercial nuclear power plant started operating in 1969; Obrigheim operated until 2005, when it was shut down by a phaseout decision of the government. The first stations with a power output of more than 1000 MW each were the two units of the Biblis Nuclear Power Plant in 1974 and 1976.

In the early 1960s, there was a proposal to build a nuclear power station in West Berlin, but the project was dropped in 1962. Another attempt to site a reactor in a major city was made in 1967, when BASF planned to build a nuclear power station on its grounds at Ludwigshafen to supply process steam. The project was withdrawn by BASF. [10]

Attempts at developing a closed fuel-cycle and breeding reactors

A closed nuclear fuel cycle was planned, starting with mining operations in the Saarland and the Schwarzwald; uranium ore concentration, fuel rod filling production in Hanau; and reprocessing of the spent fuel in the never-built nuclear fuel reprocessing plant at Wackersdorf. The radioactive waste was intended to be stored in a deep geological repository as part of the Gorleben long-term storage project. Today, there is a "ergebnisoffener" searching process over the whole country for the storage of the irradiated nuclear fuel.

In 1959, 15 municipal electric companies established the Association of Experimental Reactor GmbH (Arbeitsgemeinschaft Versuchsreaktor, AVR) to demonstrate the feasibility and viability of a gas-cooled, graphite-moderated high temperature reactor (HTGR). In the early 1960s, it started the design and construction of AVR at the Jülich Research Centre. The first criticality was attained in 1966, and the AVR was in operation for more than 22 years. Despite the fact that fuel feed and discharge system showed excellent availability, the AVR was shut down for political reasons in 1988. The AVR was designed to breed uranium-233 from thorium-232. Thorium-232 is over 100 times as abundant in the Earth's crust as uranium-235.

In 1965, before the AVR started operation, a basic design for a commercial demonstration HTGR reactor using thorium was started, the THTR-300. The HTGR, rated at 300 MWe, synchronised with the grid in 1985. Six months later, a fuel pebble became lodged in the reactor core. After repairs, it was restarted and operated in July 1986, reaching full power in September 1986. It operated until September 1988 and was shut down in September 1989.

Early opposition and reactor closures

In the early 1970s, large public demonstrations prevented the construction of a nuclear plant at Wyhl. The Wyhl protests were an example of a local community challenging the nuclear industry through a strategy of direct action and civil disobedience. The police were accused of using unnecessarily violent means. Anti-nuclear success at Wyhl inspired nuclear opposition throughout Germany and elsewhere. [11]

The ruins of the incomplete Stendal NPP reactor building Kk stendal.jpg
The ruins of the incomplete Stendal NPP reactor building

The Rheinsberg Nuclear Power Plant was the first (mostly experimental) nuclear power plant in East Germany. It was of low power and operated from 1966 until 1990. The second to be commissioned, the Greifswald Nuclear Power Plant, was planned to house eight of the Russian 440 MW VVER-440 reactors. The first four went online between 1973 and 1979. Greifswald 5 operated for less than a month before it was closed; the other three were cancelled during different stages of their build-up. In 1990, during the German reunification, all eastern German nuclear power plants were closed due to flaws in safety standards. The Stendal Nuclear Power Plant in East Germany was to be the largest nuclear power station in Germany. After German reunification and due to concerns about the Soviet design, construction was stopped, and the power station was never completed. In the 1990s, the three cooling towers that had been erected were demolished, and the area is an industrial estate today.

By 1992, a group of German and Swiss firms planned to proceed with the construction of the HTR-500, a design that made considerable use of the THTR-300 technology. But the politically hostile environment in the light of the Chernobyl disaster as well as technical issues with the THTR-300 halted any effort. The technology is now being pursued by the Chinese as the HTR-PM.

First phase-out proposal

Anti-nuclear protest near nuclear waste disposal centre at Gorleben in northern Germany on 8 November 2008. The banner reads "Only the risk is certain. Atomic power? No thanks!" Grune protests against nuclear energy.jpg
Anti-nuclear protest near nuclear waste disposal centre at Gorleben in northern Germany on 8 November 2008. The banner reads "Only the risk is certain. Atomic power? No thanks!"

During the chancellorship of Gerhard Schröder, the social democratic-green government decreed Germany's final retreat from using nuclear power by 2022, but the phase-out plan was initially delayed in late 2010, when during the chancellorship of centre-right Angela Merkel, the coalition conservative-liberal government decreed a 12-year delay of the schedule. [12] This delay provoked protests, including a human chain of 50,000 from Stuttgart to the nearby nuclear plant in Neckarwestheim. [13] Anti-nuclear demonstrations on 12 March attracted 100,000 people across Germany. [14]

Eight of the seventeen operating reactors in Germany were permanently shut down following the March 2011 Fukushima nuclear disaster. Atom-Moratorium.svg
Eight of the seventeen operating reactors in Germany were permanently shut down following the March 2011 Fukushima nuclear disaster.

On 14 March 2011, in response to the renewed concern about the use of nuclear energy raised by the Fukushima incident in the German public and in light of upcoming elections in three German states, Merkel declared a 3-month moratorium on the reactor lifespan extension passed in 2010. [15] German engineering-industry giant Siemens announced a complete withdrawal from the nuclear industry in 2011 as a response to the Fukushima nuclear disaster. [16] [17] On 15 March, the German government announced that it would temporarily shut down 8 of its 17 reactors, i.e., all reactors that went online before 1981. [18] Former proponents of nuclear energy, such as Angela Merkel, Guido Westerwelle, and Stefan Mappus, changed their positions. [19] In the largest anti-nuclear demonstration ever held in Germany, some 250,000 people protested on 26 March 2011, under the slogan "heed Fukushima – shut off all nuclear plants". [20]

Phase-out decision

On 30 May 2011, the German government announced a plan to shut down all nuclear reactors by 2022. [21] Prior to the decision, Germany's renewable energy sector already provided 17% of Germany's electricity and employed about 370,000 people. [22] The decision to phase out nuclear power has been called the swiftest change in political course since unification. [23]

Political writer David Frum characterised Merkel's decision as a political move to improve her approval ratings, which had sagged after the post-2008 financial crisis bailout of southern Europe by Germany. [24]

In September 2011, Siemens, which had been responsible for constructing all 17 of Germany's existing nuclear power plants, announced that it would exit the nuclear sector following the Fukushima disaster and the subsequent changes to German energy policy and would no longer build nuclear power plants anywhere in the world. [17] [25]

Merkel stated that Germany "[does not] only want to renounce nuclear energy by 2022, we also want to reduce our CO2 emissions by 40 percent and double our share of renewable energies, from about 17 percent today to then 35 percent". [22]

Before 2011, Germany was getting just under a quarter of its electricity from nuclear power. [22] After the Fukushima disaster, the following eight German nuclear power reactors were declared permanently shut down on 6 August 2011: Biblis A and B, Brunsbuettel, Isar 1, Kruemmel, Neckarwestheim 1, Philippsburg 1, and Unterweser. [26]

Global status of nuclear deployment (2022):
.mw-parser-output .legend{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .legend-color{display:inline-block;min-width:1.25em;height:1.25em;line-height:1.25;margin:1px 0;text-align:center;border:1px solid black;background-color:transparent;color:black}.mw-parser-output .legend-text{}
Operating reactors, building new reactors
Operating reactors, planning new build
No reactors, building new reactors
No reactors, new in planning
Operating reactors, stable
Operating reactors, decided on phase-out
Civil nuclear power is illegal
No reactors Nuclear power station.svg
Global status of nuclear deployment (2022):
  Operating reactors, building new reactors
  Operating reactors, planning new build
  No reactors, building new reactors
  No reactors, new in planning
  Operating reactors, stable
  Operating reactors, decided on phase-out
  Civil nuclear power is illegal
  No reactors
Gross generation of electricity by source in Germany from 1990 to 2020, which shows the shift from nuclear and coal to renewables and fossil gas. Energymix Germany.svg
Gross generation of electricity by source in Germany from 1990 to 2020, which shows the shift from nuclear and coal to renewables and fossil gas.

On 5 December 2016, the Federal Constitutional Court (Bundesverfassungsgericht) ruled that the nuclear plant operators affected by the accelerated phase-out of nuclear power following the Fukushima disaster are eligible for "adequate" compensation. The court found that the nuclear exit was essentially constitutional but that the utilities are entitled to damages for the "good faith" investments they made in 2010. The utilities can now sue the German government under civil law. E.ON, RWE, and Vattenfall are expected to seek a total of €19 billion under separate suits. [27] [28] [29] Six cases were registered with courts in Germany as of 7 December 2016. [30] [31]

As of March 2019, only seven nuclear plants had been left in operation and should be scheduled to be shut down and dismantled. [32] As of early 2022, three plants remain for the final year.

Renewed debate

After Russia invaded Ukraine in 2022, German energy policy – which had up to that point relied on Russian imports (particularly natural gas) to a large degree [33] – was re-evaluated, including a temporary suspension of the controversial Nord Stream 2 pipeline. [34] The German minister of economy and climate, Robert Habeck, answered in an interview that he would be "open" to extending the life of the remaining three nuclear power plants but expressed skepticism as to the feasibility of and sense of such a move. [35] Several newspapers called for a re-opening of the debate on the nuclear phaseout, including the Frankfurter Allgemeine Zeitung . [36] [37] [38] The (former) operators of Germany's remaining three nuclear power plants as well as the three reactors that had been shut down in late 2021 (but not yet dismantled) commented that they are "open" to negotiations with the government as to extending the lifetime of those reactors or restarting those that were already shut down. [39] [40] On 21 August 2022, German Economy Minister Robert Habeck said that Germany would not reverse the phase-out itself but that he was open to the idea of extending the lifespan of the Isar Nuclear Power Plant in Bavaria, subject to a stress test of Germany's electricity system. [41]

On 5 September 2022, the Federal Government announced that two of the three remaining nuclear power plants (Neckarwestheim and Isar 2) would operate beyond 31 December 2022 until April 2023 (cycle stretch out), while the Emsland Nuclear Power Plant was to be shut down as planned. [42] However, on 10 October 2022, Scholz announced that all three would remain operating until 15 April 2023. [43] Wolfgang Kubicki, deputy leader of the Free Democrats, said in an interview with the Funke Media Group that "Germany has the safest nuclear power plants worldwide and switching them off would be 'a dramatic mistake' with painful economic and ecological consequences." Other members of the Free Democratic Party have called for the nuclear power plants to be at least maintained as a precautionary measure in case they are needed in the future for power generation. [44]

Reactors

Plant
name
Unit
No.
TypeModelStatusCapacity
(MW)
Begin
building
Commercial
operation
Closed
AVR 1HTGRPBR PrototypeShut down131 Aug 196119 May 196931 Dec 1988
Biblis 1 PWR Siemens-KWUShut down/in decommissioning11671 Jan 197026 Feb 19756 Aug 2011
2 PWR KWUShut down/in decommissioning12401 Feb 197231 Jan 19776 Aug 2011
Brokdorf 1 PWR KWUShut down14101 Jan 197622 Dec 198631 Dec 2021
Brunsbüttel 1 BWR BWR-69Shut down77115 Apr 19709 Feb 19776 Aug 2011
Emsland 1 PWR Konvoi (KWU)Shut down132910 Aug 198220 Jun 198815 Apr 2023
Grafenrheinfeld 1 PWR KWUShut down12751 Jan 197517 Jun 198227 Jun 2015
Greifswald 1 PWR VVER-440/V-230Shut down/in decommissioning4081 Mar 197012 Jul 197414 Feb 1990
2 PWR VVER-440/V-230Shut down/in decommissioning4081 Mar 197016 Apr 197514 Feb 1990
3 PWR VVER-440/V-230Shut down/in decommissioning4081 Apr 19721 May 197828 Feb 1990
4 PWR VVER-440/V-230Shut down/in decommissioning4081 Apr 19721 Nov 197922 Jul 1990
5 PWR VVER-440/V-213Shut down/in decommissioning4081 Dec 19761 Nov 198924 Nov 1989
6 PWR VVER-440/V-213Finished; never entered service408
Grohnde 1 PWR KWUShut down13601 Jun 19761 Feb 198531 Dec 2021 [45]
Grosswelzheim 1 BWR BWRDismantled251 Jan 19652 Aug 197020 Apr 1971
Gundremmingen A BWR GE, BWR-1Shut down/in decommissioning23712 Dec 196212 Apr 196713 Jan 1977
B BWR BWR-72 (KWU)Shut down128420 Jul 197619 Jul 198431 Dec 2017 [46]
C BWR BWR-72 (KWU)Shut down128820 Jul 197618 Jan 198531 Dec 2021 [45]
Isar 1 BWR BWR-69Shut down/in decommissioning8781 May 197221 Mar 19796 Aug 2011
2 PWR Konvoi (KWU)Shut down141015 Sep 19829 Apr 198815 Apr 2023
Kahl 1 BWR BWR Dismantled151 Jul 19581 Feb 196225 Nov 1985
SNR-300 1 FBR Finished; never entered service19721985
KNK II1 FBR Shut down171 Sep 19743 Mar 197923 Aug 1991
Krümmel 1 BWR BWR-69 (KWU)Shut down13465 Apr 197428 Mar 19846 Aug 2011
Lingen 1 BWR BWR Shut down1831 Oct 19641 Oct 19685 Jan 1977
Mülheim-Kärlich 1 PWR B & WShut down/in decommissioning121915 Jan 19758 Aug 19879 Sep 1988
MZFR1 PHWR PHWRShut down521 Dec 196119 Dec 19663 May 1984
Neckarwestheim 1 PWR KWUShut down7851 Feb 19721 Dec 19766 Aug 2011
2 PWR Konvoi (KWU)Shut down13109 Nov 198215 Apr 198915 Apr 2023
Niederaichbach 1HWGCRPressure tube reactorShut down/decommissioned1001 Jun 19661 Jan 197331 Jul 1974
Obrigheim 1 PWR Siemens Shut down/in decommissioning34015 Mar 196531 Mar 196911 May 2005
Philippsburg 1 BWR BWR-69Shut down8901 Oct 197026 Mar 19806 Aug 2011
2 PWR KWUShut down14027 Jul 197718 Apr 198531 Dec 2019 [47]
Rheinsberg 1 PWR VVER-70Shut down/in decommissioning621 Jan 196011 Oct 19661 Jun 1990
Stade 1 PWR SiemensShut down/in decommissioning6401 Dec 196719 May 19724 Nov 2003
Stendal 1 PWR VVER-1000/V-320Unfinished19831990
2 PWR VVER-1000/V-320Unfinished19831990
THTR-300 1HTGRPBRDecommissioned2963 May 19711 Jun 198729 Sep 1988
Unterweser 1 PWR KWUShut down/in decommissioning13451 Jul 19726 Sep 19796 Aug 2011
Würgassen 1 BWR BWR-69 (AEG)Shut down/in decommissioning64026 Jan 196811 Nov 197526 Aug 1994

Radioactive waste management

Nuclear power plants take years to dismantle, and contaminated sites have to be cleared and declared free of radiation. [32] One estimate puts the cost of dismantling Germany's nuclear reactor sites at €18 billion, not counting the cost of radioactive waste disposal. [48]

No country has permanent storage sites for nuclear energy waste, and spent nuclear fuel is stockpiled in temporary locations. [49] In Germany, heavily contaminated spent fuel rods are stored in Castor containers on several temporary sites around the country. [48]

Germany is preparing the former iron ore mine Schacht Konrad in Salzgitter as a national facility for the permanent disposal of low- to medium-grade radioactive waste materials. [48] [32]

Nuclear Waste Disposal Fund

On 19 October 2016, the German cabinet (Bundeskabinett) finalised a deal with nuclear power plant operators E.ON, EnBW, RWE, and Vattenfall over long-term nuclear waste disposal. Under the agreement, the four operators are freed of responsibility for storing radioactive waste; that responsibility is instead transferred to the state. In return, the operators will pay a total of €17.4 billion into a state-administered fund to finance the interim and final storage of nuclear waste. They will also pay an additional "risk surcharge" of €6.2 billion (35.5%) to cover the eventuality that costs exceed current projections and that the interest accrued by the fund is lower than expected. The operators will be responsible for decommissioning and deconstructing their own nuclear power plants, as well as preparing their radioactive waste for final storage.

Critics, including the German Renewable Energy Federation and BUND, claim the total of €23.6 billion would prove insufficient and that future taxpayers will carry the risk. [50]

Transmutation

While the official policy of Germany is to dispose of spent fuel in a deep geological repository inside Germany's borders, [51] Germany is also involved in research into the nuclear transmutation of high-level waste (primarily actinides, which account for most of the long-term radiotoxicity of spent nuclear fuel). An important research project underway in Belgium is MYRRHA, which relies on German suppliers for the particle accelerator, which is in a sense the "heart" of every accelerator-driven system and whose reliability is the key issue to be solved before such systems can be commercialised. [52]

Accidents

Nuclear power accidents in Germany [53] [54]
DateLocationDescriptionFatalitiesCost
(million 2006 US$)
INES
1975Greifswald, East GermanyA near-core meltdown at Greifswald Nuclear Power Plant: Three out of six cooling water pumps were switched off for a failed test. A fourth pump broke down due to a loss of electric power, and control of the reactor was lost. 10 fuel elements were slightly damaged before recovery.0 ?3
4 May 1986Hamm-Uentrop, GermanyOperator actions to dislodge damaged fuel elements at the thorium high-temperature reactor released radioactivity to 4 km2 surrounding the facility.0267 ?
17 December 1987 Hessen, GermanyThe stop valve failed for a moment at Biblis Nuclear Power Plant; contamination of the local area in the reactor building.013

Phase-out

Germany decided on a phase-out in 2011. The phase-out was completed in 2023. The country has combined the phase-out with an initiative for renewable energy and wants to increase the efficiency of fossil power plants in an effort to reduce its reliance on coal. According to the former German Minister for the Environment, Jürgen Trittin, in 2020, this would cut carbon dioxide emissions by 40 percent compared with 1990 levels. Germany has become one of the leaders in the efforts to fulfil the Kyoto protocol. Critics of the German policy have called it a mistake to abandon nuclear power, claiming the only alternative to nuclear power was coal, and abandoning nuclear power was therefore contradictory to the goal of lowering CO2 emissions. [55]

The German nuclear industry has insisted that its shutdown would cause major damage to the country's industrial base. In 2012, member firms of the Verband der Industriellen Energie- und Kraftwirtschaft (VIK) reported power failures of several seconds duration, combined with a rise in frequency fluctuations. These were reportedly caused by network overloads due to the shutdown of nuclear power plants and an increase in wind power generation. [56] VIK also fears that industrial control units will be damaged by outages.

The cost of replacing Germany's nuclear power generation with renewable energy has been officially estimated by the German Ministry of Economics at about €0.01/kWh (about €55 billion for the next decade[ when? ]), on top of the €13 billion per year already devoted to subsidizing renewables. However, unofficial estimates of the ministry and of the Rhenish-Westphalian Institute for Economic Research (RWI), the German Energy Agency (DENA), the Federation of German Consumer Organisations (VZBV), and the government-owned development bank (KfW) put the cost several times higher, at about €250 billion ($340 billion) over the next decade.[ when? ] [57] [58]

Some German manufacturers and energy companies have criticised the phase-out plans, warning that Germany could face blackouts. [59] While this did not happen, [60] there has been an increase in voltage fluctuations, which has damaged industrial facilities and caused them to install voltage regulators. [61] A 2020 study found that lost nuclear electricity production has been replaced primarily by coal-fired production and net electricity imports. The social cost of this shift from nuclear to coal is approximately €3 to €8 billion annually, mostly from the eleven hundred additional deaths associated with exposure to the local air pollution emitted when burning fossil fuels. [62] Swedish energy company Vattenfall went in front of the World Bank's International Centre for Settlement of Investment Disputes (ICSID) to seek compensation from the German government for the premature shut-down of its nuclear plants. [63] [64]

In March 2013, the administrative court for the German state of Hesse ruled that a three-month closure imposed by the government on RWE's Biblis A and B reactors as an immediate response to the Fukushima Daiichi accident was illegal. [65] The state ministry of the environment acted illegally in March 2011, when an order was issued for the immediate closure of the Biblis units. RWE complied with the decree by shutting Biblis-A immediately; however, as the plants were in compliance with the relevant safety requirements, the German government had no legal grounds for shutting them. The court ruled that the closure notice was illegal because RWE had not been given sufficient opportunity to respond to the order.

In 2022, Vox commented that "Germany’s decision to restart old coal plants rather than extend the life of its nuclear power facilities reflects a failure of environmental priorities", [66] and NPR wrote, "Facing an energy crisis, Germans stock up on candles." [67] In April 2023, several critics of nuclear power plant shutdowns argued that the switching off of nuclear power plants deprives Germany of a source of low- emission power and forces the country to continue using fossil fuels that contribute to climate change. [44] [68]

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Nuclear power in the European Union accounted for approximately 26% of total electricity production in 2019 and nearly half of low-carbon energy production across the EU.

<span class="mw-page-title-main">Nuclear power debate</span> Controversy over the use of nuclear power

The nuclear power debate is a long-running controversy about the risks and benefits of using nuclear reactors to generate electricity for civilian purposes. The debate about nuclear power peaked during the 1970s and 1980s, as more and more reactors were built and came online, and "reached an intensity unprecedented in the history of technology controversies" in some countries. In the 2010s, with growing public awareness about climate change and the critical role that carbon dioxide and methane emissions plays in causing the heating of the Earth's atmosphere, there was a resurgence in the intensity of the nuclear power debate.

<span class="mw-page-title-main">Nuclear renaissance</span> Possible nuclear power industry revival

Since about 2001 the term nuclear renaissance has been used to refer to a possible nuclear power industry revival, driven by rising fossil fuel prices and new concerns about meeting greenhouse gas emission limits.

National nuclear energy policy is a national policy concerning some or all aspects of nuclear energy, such as mining for nuclear fuel, extraction and processing of nuclear fuel from the ore, generating electricity by nuclear power, enriching and storing spent nuclear fuel and nuclear fuel reprocessing. Nuclear energy policies often include the regulation of energy use and standards relating to the nuclear fuel cycle.

<span class="mw-page-title-main">International reactions to the Fukushima Daiichi nuclear disaster</span>

The international reaction to the 2011 Fukushima Daiichi nuclear disaster has been diverse and widespread. Many inter-governmental agencies responded to the Japanese Fukushima Daiichi nuclear disaster, often on an ad hoc basis. Responders included International Atomic Energy Agency, World Meteorological Organization and the Preparatory Commission for the Comprehensive Nuclear Test Ban Treaty Organization, which has radiation detection equipment deployed around the world.

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