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Nuclear and radiation accidents and incidents

Nuclear and radiation accidents and incidents is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Nuclear and radiation accidents and incidents rather than just read about it. In short: A nuclear and radiation accident is defined by the International Atomic Energy Agency (IAEA) as "an event that has led to significant consequences to people, the environment or the facility." Examples include lethal effects to individuals, large radioactivity release to the environment, or a reactor core melt. The prime example of a "major nuclear accident" is one in which a reactor core is damaged and significant a…

Nuclear and radiation accidents and incidents — main illustration
Nuclear and radiation accidents and incidents — illustration

Key takeaways

  • Nuclear and radiation accidents and incidents belongs to physics; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Nuclear and radiation accidents and incidents to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Nuclear and radiation accidents and incidents from memory before moving on to harder problems.

Reference excerpt

A nuclear and radiation accident is defined by the International Atomic Energy Agency (IAEA) as "an event that has led to significant consequences to people, the environment or the facility." Examples include lethal effects to individuals, large radioactivity release to the environment, or a reactor core melt. The prime example of a "major nuclear accident" is one in which a reactor core is damaged and significant amounts of radioactive isotopes are released, such as in the Chernobyl disaster in 1986 and the Fukushima nuclear accident in 2011. The impact of nuclear accidents has been a topic of debate since the first nuclear reactors were constructed in 1954 and has been a key factor in public concern about nuclear facilities. Technical measures to reduce the risk of accidents or to minimize the amount of radioactivity released to the environment have been adopted; however, human error remains, and there have been many accidents with varying impacts as well as near misses and incidents. As of 2014, there have been more than 100 serious nuclear accidents and incidents from the use of nuclear power. Fifty-seven accidents or severe incidents have occurred since the Chernobyl disaster, and about 60% of all nuclear-related accidents/severe incidents have occurred in the United States. Serious nuclear power plant accidents include the Fukushima nuclear accident (2011), the Chernobyl disaster (1986), the Three Mile Island accident (1979), and the SL-1 accident (1961). Nuclear power accidents can involve loss of life and large monetary costs for remediation work. Nuclear submarine accidents include the K-19 (1961), K-11 (1965), K-27 (1968), K-140 (1968), K-429 (1970), K-222 (1980), and K-431 (1985) accidents. Serious radiation incidents and accidents include the Kyshtym disaster, the Windscale fire, the radiotherapy accident in Costa Rica, the radiotherapy accident in Zaragoza, the radiation accident in Morocco, the Goiania accident, the radiation accident in Mexico City, the Samut Prakan radiation accident, and the Mayapuri radiological accident in India. The IAEA maintains a website reporting recent nuclear accidents. In 2020, the WHO stated that "Lessons learned from past radiological and nuclear accidents have demonstrated that the mental health and psychosocial consequences can outweigh the direct physical health impacts of radiation exposure.""

Nuclear plant accidents

The world's first nuclear reactor meltdown was the NRX reactor at Chalk River Laboratories, Ontario, Canada in 1952. The worst nuclear accident is the Chernobyl disaster which occurred in 1986 in the Ukrainian SSR, now Ukraine. The accident killed approximately 30 people directly and damaged approximately $7 billion of property. A study published in 2005 by the World Health Organization estimates that there may eventually be up to 4,000 additional cancer deaths related to the accident among those exposed to significant radiation levels. Radioactive fallout from the accident was concentrated in areas of Belarus, Ukraine and Russia. Other studies have estimated as many as over a million eventual cancer deaths from Chernobyl. Estimates of eventual deaths from cancer are highly contested. Industry, UN and DOE agencies claim low numbers of legally provable cancer deaths will be traceable to the disaster. The UN, DOE and industry agencies all use the limits of the epidemiological resolvable deaths as the cutoff below which they cannot be legally proven to come from the disaster. Independent studies statistically calculate fatal cancers from dose and population, even though the number of additional cancers will be below the epidemiological threshold of measurement of around 1%. These are two very different concepts and lead to the huge variations in estimates. Both are reasonable projections with different meanings. Approximately 350,000 people were forcibly resettled away from these areas soon after the accident. 6,000 people were involved in cleaning Chernobyl and 10,800 square miles (28,000 km2) were contaminated.

Social scientist and energy policy expert Benjamin K. Sovacool has reported that worldwide there have been 99 accidents at nuclear power plants from 1952 to 2009 (defined as incidents that either resulted in the loss of human life or more than US$50,000 of property damage, the amount the US federal government uses to define major energy accidents that must be reported), totaling US$20.5 billion in property damages. There have been comparatively few fatalities associated with nuclear power plant accidents. An academic review of many reactor accident and the phenomena of these events was published by Mark Foreman.

List of nuclear plant accidents and incidents

Nuclear reactor attacks

… excerpt ends here. Continue reading the full article.

Illustrations

Nuclear and radiation accidents and incidents: Following the 2011 Japanese Fukushima nuclear accident, authorities shut down the nation's 54 nuclear power plants. The Fukushima site remains radioactive, with about 30,000 evacuees still living in temporary housing, although nobody has died or is expected to die from radiation effects.[1] The difficult cleanup job will take 40 or more years, and cost tens of billions of dollars.[2][3]
Following the 2011 Japanese Fukushima nuclear accident, authorities shut down the nation's 54 nuclear power plants. The Fukushima site remains radioactive, with about 30,000 evacuees still living in temporary housing, although nobody has died or is expected to die from radiation effects.[1] The difficult cleanup job will take 40 or more years, and cost tens of billions of dollars.[2][3]
Nuclear and radiation accidents and incidents: Pathways from airborne radioactive contamination to human
Pathways from airborne radioactive contamination to human
Nuclear and radiation accidents and incidents: The abandoned city of Pripyat, Ukraine, following the Chernobyl disaster. The Chernobyl nuclear power plant is in the background.
The abandoned city of Pripyat, Ukraine, following the Chernobyl disaster. The Chernobyl nuclear power plant is in the background.
Nuclear and radiation accidents and incidents: The Kashiwazaki-Kariwa Nuclear Power Plant, a Japanese nuclear plant with seven units, the largest single nuclear power station in the world, was shut down for 21 months following an earthquake in 2007. Safety-critical systems were found to be undamaged by the earthquake.[27][28]
The Kashiwazaki-Kariwa Nuclear Power Plant, a Japanese nuclear plant with seven units, the largest single nuclear power station in the world, was shut down for 21 months following an earthquake in 2007. Safety-critical systems were found to be undamaged by the earthquake.[27][28]
Nuclear and radiation accidents and incidents: Dr. Joseph G. Hamilton was the primary researcher for the human plutonium experiments done at U.C. San Francisco from 1944 to 1947.[59] Hamilton wrote a memo in 1950 discouraging further human experiments because the AEC would be left open "to considerable criticism" since the experiments as proposed had "a little of the Buchenwald touch."[60]
Dr. Joseph G. Hamilton was the primary researcher for the human plutonium experiments done at U.C. San Francisco from 1944 to 1947.[59] Hamilton wrote a memo in 1950 discouraging further human experiments because the AEC would be left open "to considerable criticism" since the experiments as proposed had "a little of the Buchenwald touch."[60]

Worked examples

Example 1 — a first encounter with Nuclear and radiation accidents and incidents

Start with the simplest possible case. Write down what Nuclear and radiation accidents and incidents claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Nuclear and radiation accidents and incidents before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Nuclear and radiation accidents and incidents ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Nuclear and radiation accidents and incidents

In research
Nuclear and radiation accidents and incidents appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Nuclear and radiation accidents and incidents in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Nuclear and radiation accidents and incidents is common in secondary-school and first-year university syllabi. It links to neighbouring topics Non-combat military accidents, Nuclear accidents and incidents, Nuclear safety and security, so understanding it makes those chapters shorter.
In everyday life
Look for Nuclear and radiation accidents and incidents outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Nuclear and radiation accidents and incidents in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Nuclear and radiation accidents and incidents means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Nuclear and radiation accidents and incidents out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Nuclear and radiation accidents and incidents in simple terms?

A nuclear and radiation accident is defined by the International Atomic Energy Agency (IAEA) as "an event that has led to significant consequences to people, the environment or the facility." Examples include lethal effects to individuals, large radioactivity release to the environment, or a reacto…

Why does Nuclear and radiation accidents and incidents matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Nuclear and radiation accidents and incidents?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Nuclear and radiation accidents and incidents.

Tags

  • Non-combat military accidents
  • Nuclear accidents and incidents
  • Nuclear safety and security
  • Radiation accidents and incidents

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