Portal:Nuclear technology

The Nuclear Technology Portal

Introduction

This symbol of radioactivity is internationally recognized.

• Nuclear technology is technology that involves the nuclear reactions of atomic nuclei. Among the notable nuclear technologies are nuclear reactors, nuclear medicine and nuclear weapons. It is also used, among other things, in smoke detectors and gun sights. (Full article...)
  
• Nuclear power is the use of nuclear reactions to produce electricity. Nuclear power can be obtained from nuclear fission, nuclear decay and nuclear fusion reactions. Presently, the vast majority of electricity from nuclear power is produced by nuclear fission of uranium and plutonium in nuclear power plants. Nuclear decay processes are used in niche applications such as radioisotope thermoelectric generators in some space probes such as Voyager 2. Generating electricity from fusion power remains the focus of international research. (Full article...)
  
• A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission (fission bomb) or a combination of fission and fusion reactions (thermonuclear bomb), producing a nuclear explosion. Both bomb types release large quantities of energy from relatively small amounts of matter. (Full article...)

General images -

The following are images from various nuclear technology-related articles on Wikipedia.

• 
  The Ignalina Nuclear Power Plant – a RBMK type (closed 2009) (from Nuclear reactor)
• 
  A schematic nuclear fission chain reaction. 1. A uranium-235 atom absorbs a neutron and fissions into two new atoms (fission fragments), releasing three new neutrons and some binding energy. 2. One of those neutrons is absorbed by an atom of uranium-238 and does not continue the reaction. Another neutron is simply lost and does not collide with anything, also not continuing the reaction. However, the one neutron does collide with an atom of uranium-235, which then fissions and releases two neutrons and some binding energy. 3. Both of those neutrons collide with uranium-235 atoms, each of which fissions and releases between one and three neutrons, which can then continue the reaction. (from Nuclear fission)
• 
  The Chicago Pile, the first artificial nuclear reactor, built in secrecy at the University of Chicago in 1942 during World War II as part of the US's Manhattan project (from Nuclear reactor)
• 
  In thermal nuclear reactors (LWRs in specific), the coolant acts as a moderator that must slow down the neutrons before they can be efficiently absorbed by the fuel. (from Nuclear reactor)
• 
  The Calder Hall nuclear power station in the United Kingdom, the world's first commercial nuclear power station. (from Nuclear power)
• 
  The number of nuclear warheads by country in 2024, based on an estimation by the Federation of American Scientsts. (from Nuclear weapon)
• 
  Olkiluoto 3 under construction in 2009. It was the first EPR, a modernized PWR design, to start construction. (from Nuclear power)
• 
  Schematic of the ITER tokamak under construction in France (from Nuclear power)
• 
  Ballistic missile submarines have been of great strategic importance for the United States, Russia, and other nuclear powers since they entered service in the Cold War, as they can hide from reconnaissance satellites and fire their nuclear weapons with virtual impunity. (from Nuclear weapon)
• 
  The mushroom cloud of the atomic bomb dropped on Nagasaki, Japan, on 9 August 1945 rose over 18 kilometres (11 mi) above the bomb's hypocenter. An estimated 39,000 people were killed by the atomic bomb, of whom 23,145–28,113 were Japanese factory workers, 2,000 were Korean slave laborers, and 150 were Japanese combatants. (from Nuclear fission)
• 
  A photograph of Sumiteru Taniguchi's back injuries taken in January 1946 by a U.S. Marine photographer (from Nuclear weapon)
• 
  Diablo Canyon – a PWR (from Nuclear reactor)
• 
  The multi-mission radioisotope thermoelectric generator (MMRTG), used in several space missions such as the Curiosity Mars rover (from Nuclear power)
• 
  The CANDU Qinshan Nuclear Power Plant (from Nuclear reactor)
• 
  Dry cask storage vessels storing spent nuclear fuel assemblies (from Nuclear power)
• 
  The first light bulbs ever lit by electricity generated by nuclear power at EBR-1 at Argonne National Laboratory-West, December 20, 1951. (from Nuclear power)
• 
  Animation of a Coulomb explosion in the case of a cluster of positively charged nuclei, akin to a cluster of fission fragments. Hue level of color is proportional to (larger) nuclei charge. Electrons (smaller) on this time-scale are seen only stroboscopically and the hue level is their kinetic energy. (from Nuclear fission)
• 
  Lise Meitner and Otto Hahn in their laboratory (from Nuclear reactor)
• 
  Activity of spent UOx fuel in comparison to the activity of natural uranium ore over time (from Nuclear power)
• 
  The Ikata Nuclear Power Plant, a pressurized water reactor that cools by utilizing a secondary coolant heat exchanger with a large body of water, an alternative cooling approach to large cooling towers (from Nuclear power)
• 
  The Magnox Sizewell A nuclear power station (from Nuclear reactor)
• 
  Ukrainian workers use equipment provided by the U.S. Defense Threat Reduction Agency to dismantle a Soviet-era missile silo. After the end of the Cold War, Ukraine and the other non-Russian, post-Soviet republics relinquished Soviet nuclear stockpiles to Russia. (from Nuclear weapon)
• 
  The nuclear fuel cycle begins when uranium is mined, enriched, and manufactured into nuclear fuel (1), which is delivered to a nuclear power plant. After use, the spent fuel is delivered to a reprocessing plant (2) or to a final repository (3). In nuclear reprocessing 95% of spent fuel can potentially be recycled to be returned to use in a power plant (4). (from Nuclear power)
• 
  This view of downtown Las Vegas shows a mushroom cloud in the background. Scenes such as this were typical during the 1950s. From 1951 to 1962 the government conducted 100 atmospheric tests at the nearby Nevada Test Site. (from Nuclear weapon)
• 
  Edward Teller, often referred to as the "father of the hydrogen bomb" (from Nuclear weapon)
• 
  A comparison of prices over time for energy from nuclear fission and from other sources. Over the presented time, thousands of wind turbines and similar were built on assembly lines in mass production resulting in an economy of scale. While nuclear remains bespoke, many first of their kind facilities added in the timeframe indicated and none are in serial production. Our World in Data notes that this cost is the global average, while the 2 projects that drove nuclear pricing upwards were in the US. The organization recognises that the median cost of the most exported and produced nuclear energy facility in the 2010s the South Korean APR1400, remained "constant", including in export.
  LCOE is a measure of the average net present cost of electricity generation for a generating plant over its lifetime. As a metric, it remains controversial as the lifespan of units are not independent but manufacturer projections, not a demonstrated longevity. (from Nuclear power)
• 
  Scaled-down model of TOPAZ nuclear reactor (from Nuclear reactor)
• 
  The status of nuclear power globally (click for legend) (from Nuclear power)
• 
  Most waste packaging, small-scale experimental fuel recycling chemistry and radiopharmaceutical refinement is conducted within remote-handled hot cells. (from Nuclear power)
• 
  UN vote on adoption of the Treaty on the Prohibition of Nuclear Weapons on July 7, 2017
  

    Yes

    No

    Did not vote

  (from Nuclear weapon)
• 
  A visual representation of an induced nuclear fission event where a slow-moving neutron is absorbed by the nucleus of a uranium-235 atom, which fissions into two fast-moving lighter elements (fission products) and additional neutrons. Most of the energy released is in the form of the kinetic velocities of the fission products and the neutrons. (from Nuclear fission)
• 
  Otto Hahn and Lise Meitner in 1912 (from Nuclear fission)
• 
  Life-cycle greenhouse gas emissions of electricity supply technologies, median values calculated by IPCC (from Nuclear power)
• 
  Core of CROCUS, a small nuclear reactor used for research at the EPFL in Switzerland (from Nuclear reactor)
• 
  A demilitarized, commercial launch of the Russian Strategic Rocket Forces R-36 ICBM; also known by the NATO reporting name: SS-18 Satan. Upon its first fielding in the late 1960s, the SS-18 remains the single highest throw weight missile delivery system ever built. (from Nuclear weapon)
• 
  Typical composition of uranium dioxide fuel before and after approximately three years in the once-through nuclear fuel cycle of a LWR (from Nuclear power)
• 
  The two basic fission weapon designs (from Nuclear weapon)
• 
  J. Robert Oppenheimer, principal leader of the Manhattan Project, often referred to as the "father of the atomic bomb". (from Nuclear weapon)
• 
  The International Atomic Energy Agency was created in 1957 to encourage peaceful development of nuclear technology while providing international safeguards against nuclear proliferation. (from Nuclear weapon)
• 
  A Minuteman III ICBM test launch from Vandenberg Air Force Base, United States. MIRVed land-based ICBMs are considered destabilizing because they tend to put a premium on striking first. (from Nuclear weapon)
• 
  Montage of an inert test of a United States Trident SLBM (submarine launched ballistic missile), from submerged to the terminal, or re-entry phase, of the multiple independently targetable reentry vehicles (from Nuclear weapon)
• 
  Nuclear fuel assemblies being inspected before entering a pressurized water reactor in the United States (from Nuclear power)
• 
  Treatment of the interior part of a VVER-1000 reactor frame at Atommash (from Nuclear reactor)
• 
  The town of Pripyat abandoned since 1986, with the Chernobyl plant and the Chernobyl New Safe Confinement arch in the distance (from Nuclear power)
• 
  The USSR and United States nuclear weapon stockpiles throughout the Cold War until 2015, with a precipitous drop in total numbers following the end of the Cold War in 1991. (from Nuclear weapon)
• 
  Over 2,000 nuclear tests have been conducted in over a dozen different sites around the world. Red Russia/Soviet Union, blue France, light blue United States, violet Britain, yellow China, orange India, brown Pakistan, green North Korea and light green (territories exposed to nuclear bombs). The Black dot indicates the location of the Vela incident. (from Nuclear weapon)
• 
  The Torness nuclear power station – an AGR (from Nuclear reactor)
• 
  The nuclear fission display at the Deutsches Museum in Munich. The table and instruments are originals, but would not have been together in the same room. (from Nuclear fission)
• 
  Share of electricity production from nuclear, 2022 (from Nuclear power)
• 
  Anti-nuclear protest near nuclear waste disposal centre at Gorleben in northern Germany (from Nuclear power)
• 
  Nuclear waste flasks generated by the United States during the Cold War are stored underground at the Waste Isolation Pilot Plant (WIPP) in New Mexico. The facility is seen as a potential demonstration for storing spent fuel from civilian reactors. (from Nuclear power)
• 
  The Trinity test of the Manhattan Project was the first detonation of a nuclear weapon, which led J. Robert Oppenheimer to recall verses from the Hindu scripture Bhagavad Gita: "If the radiance of a thousand suns were to burst at once into the sky, that would be like the splendor of the mighty one "... "I am become Death, the destroyer of worlds". (from Nuclear weapon)
• 
  Fission product yields by mass for thermal neutron fission of uranium-235, plutonium-239, a combination of the two typical of current nuclear power reactors, and uranium-233, used in the thorium cycle. (from Nuclear fission)
• 
  The Leibstadt Nuclear Power Plant in Switzerland (from Nuclear power)
• 
  Anti-nuclear weapons protest march in Oxford, 1980 (from Nuclear weapon)
• 
  The guided-missile cruiser USS Monterey (CG 61) receives fuel at sea (FAS) from the Nimitz-class aircraft carrier USS George Washington (CVN 73). (from Nuclear power)
• 
  Primary coolant system showing reactor pressure vessel (red), steam generators (purple), pressurizer (blue), and pumps (green) in the three coolant loop Hualong One pressurized water reactor design (from Nuclear reactor)
• 
  Soviet OTR-21 Tochka missile. Capable of firing a 100-kiloton nuclear warhead a distance of 185 km (from Nuclear weapon)
• 
  NC State's PULSTAR Reactor is a 1 MW pool-type research reactor with 4% enriched, pin-type fuel consisting of UO₂ pellets in zircaloy cladding. (from Nuclear reactor)
• 
  The cooling towers of the Philippsburg Nuclear Power Plant in Germany (from Nuclear fission)
• 
  Some of the Chicago Pile Team, including Enrico Fermi and Leó Szilárd (from Nuclear reactor)
• 
  United States and USSR/Russian nuclear weapons stockpiles, 1945–2006. The Megatons to Megawatts Program was the main driving force behind the sharp reduction in the quantity of nuclear weapons worldwide since the cold war ended. (from Nuclear power)
• 
  Demonstration against nuclear testing in Lyon, France, in the 1980s. (from Nuclear weapon)
• 
  Growth of worldwide nuclear power generation (from Nuclear power)
• 
  Proportions of the isotopes uranium-238 (blue) and uranium-235 (red) found in natural uranium and in enriched uranium for different applications. Light water reactors use 3–5% enriched uranium, while CANDU reactors work with natural uranium. (from Nuclear power)
• 
  Mushroom cloud from the explosion of Castle Bravo, the largest nuclear weapon detonated by the U.S., in 1954 (from Nuclear weapon)
• 
  An assortment of American nuclear intercontinental ballistic missiles at the National Museum of the United States Air Force. Clockwise from top left: PGM-17 Thor, LGM-25C Titan II, HGM-25A Titan I, Thor-Agena, LGM-30G Minuteman III, LGM-118 Peacekeeper, LGM-30A/B/F Minuteman I or II, PGM-19 Jupiter (from Nuclear weapon)
• 
  Three of the reactors at Fukushima I overheated, causing the coolant water to dissociate and led to the hydrogen explosions. This along with fuel meltdowns released large amounts of radioactive material into the air. (from Nuclear reactor)
• 
  The basics of the Teller–Ulam design for a hydrogen bomb: a fission bomb uses radiation to compress and heat a separate section of fusion fuel. (from Nuclear weapon)
• 
  Death rates from air pollution and accidents related to energy production, measured in deaths in the past per terawatt hours (TWh) (from Nuclear power)
• 
  Following the 2011 Fukushima Daiichi nuclear disaster, the world's worst nuclear accident since 1986, 50,000 households were displaced after radiation leaked into the air, soil and sea. Radiation checks led to bans of some shipments of vegetables and fish. (from Nuclear power)
• 
  The stages of binary fission in a liquid drop model. Energy input deforms the nucleus into a fat "cigar" shape, then a "peanut" shape, followed by binary fission as the two lobes exceed the short-range nuclear force attraction distance, and are then pushed apart and away by their electrical charge. In the liquid drop model, the two fission fragments are predicted to be the same size. The nuclear shell model allows for them to differ in size, as usually experimentally observed. (from Nuclear fission)
• 
  The now decommissioned United States' Peacekeeper missile was an ICBM developed to replace the Minuteman missile in the late 1980s. Each missile, like the heavier lift Russian SS-18 Satan, could contain up to ten nuclear warheads (shown in red), each of which could be aimed at a different target. A factor in the development of MIRVs was to make complete missile defense difficult for an enemy country. (from Nuclear weapon)
• 
  An example of an induced nuclear fission event. A neutron is absorbed by the nucleus of a uranium-235 atom, which in turn splits into fast-moving lighter elements (fission products) and free neutrons. Though both reactors and nuclear weapons rely on nuclear chain reactions, the rate of reactions in a reactor is much slower than in a bomb. (from Nuclear reactor)
• 
  The Superphénix, closed in 1998, was one of the few FBRs. (from Nuclear reactor)
• 
  Drawing of the first artificial reactor, Chicago Pile-1. (from Nuclear fission)
• 
  The first nuclear weapons were gravity bombs, such as this "Fat Man" weapon dropped on Nagasaki, Japan. They were large and could only be delivered by heavy bomber aircraft (from Nuclear weapon)
• 
  The launching ceremony of the USS Nautilus January 1954. In 1958 it would become the first vessel to reach the North Pole. (from Nuclear power)
• 
  Induced fission reaction. A neutron is absorbed by a uranium-235 nucleus, turning it briefly into an excited uranium-236 nucleus, with the excitation energy provided by the kinetic energy of the neutron plus the forces that bind the neutron. The uranium-236, in turn, splits into fast-moving lighter elements (fission products) and releases several free neutrons, one or more "prompt gamma rays" (not shown) and a (proportionally) large amount of kinetic energy. (from Nuclear fission)
• 
  Protest in Bonn against the nuclear arms race between the U.S./NATO and the Warsaw Pact, 1981 (from Nuclear weapon)
• 
  The "curve of binding energy": A graph of binding energy per nucleon of common isotopes. (from Nuclear fission)
• 
  Reactor decay heat as a fraction of full power after the reactor shutdown, using two different correlations. To remove the decay heat, reactors need cooling after the shutdown of the fission reactions. A loss of the ability to remove decay heat caused the Fukushima accident. (from Nuclear power)

Selected article -

Operation Mosaic was a series of two British nuclear tests conducted in the Montebello Islands in Western Australia on 16 May and 19 June 1956. These tests followed the Operation Totem series and preceded the Operation Buffalo series. The second test in the series was the largest ever conducted in Australia.

The purpose of the tests was to explore increasing the yield of British nuclear weapons through boosting with lithium-6 and deuterium, and the use of a natural uranium tamper. Although a boosted fission weapon is not a hydrogen bomb, which the British Government had agreed would not be tested in Australia, the tests were connected with the British hydrogen bomb programme.

The Operation Totem tests of 1953 had been carried out at Emu Field in South Australia, but Emu Field was considered unsuitable for Operation Mosaic. A new, permanent test site was being prepared at Maralinga in South Australia, but would not be ready until September 1956. It was decided that the best option was to return to the Montebello Islands, where Operation Hurricane had been conducted in 1952. To allow the task force flagship, the tank landing ship HMS Narvik, to return to the UK and refit in time for Operation Grapple, the planned first test of a British hydrogen bomb, 15 July was set as the terminal date for Operation Mosaic. The British Government was anxious that Grapple should take place before a proposed moratorium on nuclear testing came into effect. The second test was therefore conducted under time pressure.

At the time of the Royal Commission into British nuclear tests in Australia it was claimed that the second test was of a significantly higher yield than suggested by the official figures: 98 kilotonnes of TNT (410 TJ) as compared to 60 kilotonnes of TNT (250 TJ), but this remains unsubstantiated. (Full article...)

More selected articles

Selected picture -

Credit: Samat Jain

Trinity Site obelisk.

The black plaque on top reads:

Trinity Site
Where The World's First Nuclear Device Was Exploded On July 16, 1945
Erected 1965 White Sands Missile Range J. Frederick Thorlin Major General U.S. Army Commanding

The gold plaque below it declares the site a National Historic Landmark, and reads:

Trinity Site has been designated a National Historical Landmark
This Site Possesses National Significance In Commemorating The History of the United States of America
1975 National Park Service United States Department of the Interior

Did you know?

• ... that during World War II, pilot G. E. Clements was removed from training for secret missions associated with the Manhattan Project when senior officers realized she was a woman?
• ... that in 1958 the Scyla theta pinch device was the first to demonstrate controlled nuclear fusion in the laboratory?
• ... that plutonium produced in the nuclear reactors at the Hanford Engineer Works was used in the Fat Man bomb used in the atomic bombing of Nagasaki in August 1945?
• ... that Project Carryall proposed the detonation of 23 nuclear devices in California to build a road?
• ... that the British Tychon missile was developed from a Barnes Wallis concept to keep strike aircraft safe while dropping nuclear bombs?
• ... that Project Ketch proposed the detonation of a 24-kiloton nuclear device in Pennsylvania to create a natural-gas storage reservoir?

Related WikiProjects

• WikiProject Energy
• WikiProject Technology
• WikiProject Military history

Things you can do

Here are some Open Tasks : Improve: List of nuclear tests, List of nuclear weapons, List of basic nuclear technology topics Requests: Stubs: Beta particle, General Atomics, Neutron economy, Critical size, Auxiliary feedwater, Power history, Uranium-233, Decay heat, Reactor vessel, Optoelectric nuclear battery, Radioisotope heater unit, Radioisotope piezoelectric generator, Fuel element failure, Fusion torch Cleanup: Nominate and vote: Science Collaboration of the Week, Article Improvement Drive

Selected biography -

Eugene Paul Wigner (Hungarian: Wigner Jenő Pál, pronounced [ˈviɡnɛr ˈjɛnøː ˈpaːl]; November 17, 1902 – January 1, 1995) was a Hungarian-American theoretical physicist who also contributed to mathematical physics. He received the Nobel Prize in Physics in 1963 "for his contributions to the theory of the atomic nucleus and the elementary particles, particularly through the discovery and application of fundamental symmetry principles".

A graduate of the Technical University of Berlin, Wigner worked as an assistant to Karl Weissenberg and Richard Becker at the Kaiser Wilhelm Institute in Berlin, and David Hilbert at the University of Göttingen. Wigner and Hermann Weyl were responsible for introducing group theory into physics, particularly the theory of symmetry in physics. Along the way he performed ground-breaking work in pure mathematics, in which he authored a number of mathematical theorems. In particular, Wigner's theorem is a cornerstone in the mathematical formulation of quantum mechanics. He is also known for his research into the structure of the atomic nucleus. In 1930, Princeton University recruited Wigner, along with John von Neumann, and he moved to the United States, where he obtained citizenship in 1937.

Wigner participated in a meeting with Leo Szilard and Albert Einstein that resulted in the Einstein–Szilard letter, which prompted President Franklin D. Roosevelt to authorize the creation of the Advisory Committee on Uranium with the purpose of investigating the feasibility of nuclear weapons. Wigner was afraid that the German nuclear weapon project would develop an atomic bomb first. During the Manhattan Project, he led a team whose task was to design nuclear reactors to convert uranium into weapons grade plutonium. At the time, reactors existed only on paper, and no reactor had yet gone critical. Wigner was disappointed that DuPont was given responsibility for the detailed design of the reactors, not just their construction. He became director of research and development at the Clinton Laboratory (now the Oak Ridge National Laboratory) in early 1946, but became frustrated with bureaucratic interference by the Atomic Energy Commission, and returned to Princeton.

In the postwar period, he served on a number of government bodies, including the National Bureau of Standards from 1947 to 1951, the mathematics panel of the National Research Council from 1951 to 1954, the physics panel of the National Science Foundation, and the influential General Advisory Committee of the Atomic Energy Commission from 1952 to 1957 and again from 1959 to 1964. In later life, he became more philosophical, and published The Unreasonable Effectiveness of Mathematics in the Natural Sciences, his best-known work outside technical mathematics and physics. (Full article...)

More selected biographies

Nuclear technology news

14 May 2024 –

Russia places its nuclear capable submarine-launched Bulava intercontinental ballistic missile into service. (Reuters)

9 May 2024 – Joint Comprehensive Plan of Action, Iran–Israel relations

Iran warns that it will build a nuclear weapon if Israel continues to target its nuclear facilities. (Al Jazeera)

25 April 2024 – Russia–NATO relations

Russian Deputy Foreign Minister Sergei Ryabkov warns that Russia will make NATO nuclear weapons in Poland one of its primary targets if they are deployed there. (The Jerusalem Post)

23 April 2024 – North Korea and weapons of mass destruction

North Korea claims that it tested a new command-and-control system in a simulated nuclear counterstrike. (CNN)

Related portals

Related topics

Subcategories

Category puzzle

Select [►] to view subcategories

Nuclear technology

Nuclear technology by country

Nuclear engineers

Nuclear technology-related lists

Anti-nuclear movement

Nuclear accidents and incidents

Advanced Stirling radioisotope generator

Nuclear technology companies

Nuclear explosives

Nuclear facilities

Nuclear fuels

Isotope separation

Nuclear materials

Nuclear medicine

Neutron sources

Nuclear power

Nuclear programs

Nuclear propulsion

Radiation effects

Nuclear reactors

Nuclear reprocessing

Nuclear safety and security

Nuclear technology treaties

Radioactive waste

Nuclear weapons

Works about nuclear technology

Nuclear technology stubs

Associated Wikimedia

The following Wikimedia Foundation sister projects provide more on this subject:

• 

  Commons
  Free media repository

• 

  Wikibooks
  Free textbooks and manuals

• 

  Wikidata
  Free knowledge base

• 

  Wikinews
  Free-content news

• 

  Wikiquote
  Collection of quotations

• 

  Wikisource
  Free-content library

• 

  Wikiversity
  Free learning tools

• 

  Wiktionary
  Dictionary and thesaurus

Discover Wikipedia using portals

• 

  List of all portals

• 

  The arts portal

• 

  Biography portal

• 

  Current events portal

• 

  Geography portal

• 

  History portal

• 

  Mathematics portal

• 

  Science portal

• 

  Society portal

• 

  Technology portal

• 

  Random portal

• 

  WikiProject Portals