Nuclear and radiation accidents

The list of the worst disasters at nuclear power plants and other nuclear facilities all over the world is presented below:

During the 2011 Fukushima nuclear emergency in Japan, three nuclear reactors were damaged by explosions.

The abandoned city of Prypiat, Ukraine, following the Chernobyl disaster. The Chernobyl nuclear power plant is in the background.

One of the worst nuclear accidents to date was the Chernobyl disaster which occurred in 1986 in Ukraine. That accident killed 30 people directly, as well as damaging approximately $7 billion of property. A study published in 2005 estimates that there will eventually be up to 4,000 additional cancer deaths related to the accident among those exposed to significant radiation levels.^[1] Radioactive fallout from the accident was concentrated in areas of Belarus, Ukraine and Russia. Approximately 350,000 people were forcibly resettled away from these areas soon after the accident.^[1]

Some of the most serious nuclear and radiation accidents by death toll in the world have involved nuclear submarine mishaps. To-date, all of these were units of the former Soviet Union.^[2][3][4][2]

Normal accidents

Normal Accidents is a 1984 book by Yale sociologist Charles Perrow, which provides a detailed analysis of complex systems from a social sciences perspective. It was the first to characterize complex technological systems such as nuclear power plants according to their riskiness. Perrow says that multiple and unexpected failures are built into society's complex and tightly-coupled systems. Such accidents cannot be designed around.^[5]

The inspiration for Perrow's books was the 1979 Three Mile Island accident, where a nuclear accident resulted from an unanticipated interaction of multiple failures in a complex system. The event was an example of a normal accident because it was "unexpected, incomprehensible, uncontrollable and unavoidable".^[6]

Perrow's argument rests on three principles. Firstly, people make mistakes, even at nuclear plants. Secondly, big accidents almost always escalate from very small beginnings. Thirdly, many failures are those of organizations more than technology. Each of these principles is still relevant today.^[5]

Nuclear power

Nuclear power plant accidents and incidents
with multiple fatalities and/or more than US$100 million in property damage, 1952-2011^[7][1][8]

Date	Location of accident	Description of accident	Dead	Cost ($US millions 2006 )	INES Scale[9]
October 10, 1957	Sellafield, Cumberland, United Kingdom	A fire at the British atomic bomb project destroyed the core and released radioactive material into the environment.	0		5
January 3, 1961	Idaho Falls, Idaho, United States	Explosion at SL-1 prototype at the National Reactor Testing Station. All 3 operators were killed when a control rod was removed too far.	3	22	4
October 5, 1966	Frenchtown Charter Township, Michigan, United States	Partial core meltdown of the Fermi 1 Reactor at the Enrico Fermi Nuclear Generating Station.	0	132[10]
January 21, 1969	Lucens reactor, Vaud, Switzerland	Loss-of-coolant accident, leading to a partial core meltdown and massive radioactive contamination of the cavern, which was then sealed.	0		4
1975	Sosnovyi Bor, Leningrad Oblast, Russia	There was reportedly a partial nuclear meltdown in Leningrad nuclear power plant reactor unit 1.
December 7, 1975	Greifswald, East Germany	Electrical error causes fire in the main trough that destroys control lines and five main coolant pumps	0	443	3
January 5, 1976	Jaslovské Bohunice, Czechoslovakia	Malfunction during fuel replacement. Fuel rod ejected from reactor into the reactor hall by coolant (CO2).[11]	2		4
February 22, 1977	Jaslovské Bohunice, Czechoslovakia	Severe corrosion of reactor and release of radioactivity into the plant area, necessitating total decommission	0	1,700	4
March 28, 1979	Three Mile Island, Pennsylvania, United States	Loss of coolant and partial core meltdown due to operator errors. There is a small release of radioactive gases.	0	2,400	5
September 15, 1984	Athens, Alabama, United States	Safety violations, operator error, and design problems force a six-year outage at Browns Ferry Unit 2.	0	110
March 9, 1985	Athens, Alabama, United States	Instrumentation systems malfunction during startup, which led to suspension of operations at all three Browns Ferry Units	0	1,830
April 11, 1986	Plymouth, Massachusetts, United States	Recurring equipment problems force emergency shutdown of Boston Edison’s Pilgrim Nuclear Power Plant	0	1,001
April 26, 1986	Chernobyl disaster, Ukrainian SSR	Overheating, steam explosion, fire, and meltdown, necessitating the evacuation of 300,000 people from Chernobyl and dispersing radioactive material across Europe	56 direct; 4,000 to 985,000 cancer[12][13]	6,700	7
May 4, 1986	Hamm-Uentrop, Germany	Experimental THTR-300 reactor releases small amounts of fission products (0.1 GBq Co-60, Cs-137, Pa-233) to surrounding area	0	267
March 31, 1987	Delta, Pennsylvania, United States	Peach Bottom units 2 and 3 shutdown due to cooling malfunctions and unexplained equipment problems	0	400
December 19, 1987	Lycoming, New York, United States	Malfunctions force Niagara Mohawk Power Corporation to shut down Nine Mile Point Unit 1	0	150
March 17, 1989	Lusby, Maryland, United States	Inspections at Calvert Cliff Units 1 and 2 reveal cracks at pressurized heater sleeves, forcing extended shutdowns	0	120
March 1992	Sosnovyi Bor, Leningrad Oblast, Russia	An accident at the Sosnovy Bor nuclear plant leaked radioactive gases and iodine into the air through a ruptured fuel channel.
February 20, 1996	Waterford, Connecticut, United States	Leaking valve forces shutdown Millstone Nuclear Power Plant Units 1 and 2, multiple equipment failures found	0	254
September 2, 1996	Crystal River, Florida, United States	Equipment malfunction forces shutdown and extensive repairs at Crystal River Unit 3	0	384
September 30, 1999	Ibaraki Prefecture, Japan	Tokaimura nuclear accident killed two workers, and exposed one more to radiation levels above permissible limits.	2	54	4
February 16, 2002	Oak Harbor, Ohio, United States	Severe corrosion of control rod forces 24-month outage of Davis-Besse reactor	0	143	3
August 9, 2004	Fukui Prefecture, Japan	Steam explosion at Mihama Nuclear Power Plant kills 4 workers and injures 7 more	4	9	1
July 25, 2006	Forsmark, Sweden	An electrical fault at Forsmark Nuclear Power Plant caused one reactor to be shut down	0	100	2
March 11, 2011	Fukushima, Japan	A tsunami flooded and damaged the 5 active reactor plants drowning two workers. Loss of backup electrical power led to overheating, meltdowns, and evacuations.[14] One man died suddenly while carrying equipment during the clean-up.			7[15]
12 September 2011	Marcoule, France	One person was killed and four injured, one seriously, in a blast at the Marcoule Nuclear Site. The explosion took place in a furnace used to melt metallic waste.	1

Nuclear submarines

Some of the most serious nuclear and radiation accidents by death toll in the world have involved nuclear submarine mishaps. To-date, all of these were units of the former Soviet Union.^[2][3] Reactor accidents that resulted in core damage and release of radioactivity from nuclear-powered submarines include:^[4][2]

• K-8, 1960, loss-of-coolant accident; substantial radioactivity released.^[16]
• K-14, 1961, reactor compartment replaced due to unspecified "breakdown of reactor protection systems."
• K-19, 1961, loss-of-coolant accident resulting in 8 deaths and more than 30 other people being over-exposed to radiation.^[17] The events on board the submarine are dramatized by the film K-19: The Widowmaker.
• K-11, 1965, both reactors damaged during refueling while lifting the reactor vessel heads; reactor compartments scuttled off the east coast of Novaya Zemlya in the Kara Sea in 1966.
• K-27, 1968, experienced reactor core damage to one of its reactors, resulting in 9 fatalities and 83 other injuries; scuttled in the Kara Sea in 1982.^[18]
• K-140, 1968, reactor damaged following an uncontrolled, automatic increase in power during shipyard work.^[19]
• K-429, 1970, an uncontrolled start up of the ship's reactor led to a fire and the release of radioactivity^[19]
• K-116, 1970, loss-of-coolant accident in the port reactor; substantial radioactivity released.
• K-64, 1972, failure of the first Alfa-class liquid-metal cooled reactor; reactor compartment scrapped.
• K-222, 1980, Papa-class submarine had a reactor accident during maintenance in the shipyard while the ship's naval crew had left for lunch.^[19]
• K-123, 1982, Alfa-class submarine reactor core damaged by liquid-metal coolant leak; the sub was forced out of commission for eight years.^[19][20]
• K-431, 1985, a reactor accident while refueling resulted in 10 fatalities and 49 other people suffered radiation injuries.^[3]
• K-219, 1986, suffered an explosion and fire in a missile tube, eventually leading to a reactor accident; a 20-year old enlisted seaman, Sergei Preminin, sacrificed his life to secure one of the onboard reactors. The submarine sank three days later.
• K-192, 1989, loss-of-coolant accident; reclassified from K-131.

Radiotherapy accidents

Year	Type	Accident	ARS fatalities	ARS survivors	Location
1957	alleged crime	Nikolay Khokhlov assassination attempt[21]	0	1	Frankfurt, West Germany
1962	orphan source	radiation accident in Mexico City	4	?	Mexico City, Mexico
1985	radiotherapy	Therac-25 radiation overdose accidents	3	3
1984	orphan source	radiation accident in Morocco[22]	8	3	Mohammedia, Morocco
1987	orphan source	Goiânia accident[23]	4	?	Goiânia, Brazil
1990	radiotherapy	radiotherapy accident in Zaragoza[24]	11	?	Zaragoza, Spain
1996	radiotherapy	radiotherapy accident in Costa Rica[25]	7 to 20	46	San José, Costa Rica
2000	orphan source	Samut Prakan radiation accident[26]	3	7	Samut Prakan Province, Thailand
2000	radiotherapy	Instituto Oncologico Nacional accident[27][2]	3 to 7	?	Panama City, Panama
2006	crime	Poisoning of Alexander Litvinenko[21][28][29][30][31]	1	0	London, United Kingdom
2010	orphan source	Mayapuri radiological accident[26]	1	7	Mayapuri, India

Related pages

• Nuclear or Not?