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- Decay_heat abstract "Decay heat is the heat released as a result of radioactive decay. This heat is produced as an effect of radiation on materials: the energy of the alpha, beta or gamma radiation is converted into the thermal movement of atoms.Decay heat occurs naturally from decay of long-lived radioisotopes that are primordially present from the Earth's formation.In nuclear reactor engineering, decay heat plays an important role in reactor heat generation during the relatively short time after the reactor has been shut down (see SCRAM), and nuclear chain reactions have been suspended. The decay of the short-lived radioisotopes created in fission continues at high power, for a time after shut down. The major source of heat production in a newly shut down reactor is due to the beta decay of new radioactive elements recently produced from fission fragments in the fission process.Quantitatively, at the moment of reactor shutdown, decay heat from these radioactive sources is still 6.5% of the previous core power, if the reactor has had a long and steady power history. About 1 hour after shutdown, the decay heat will be about 1.5% of the previous core power. After a day, the decay heat falls to 0.4%, and after a week it will be only 0.2%. Because radioisotopes of all half life lengths are present in nuclear waste, enough decay heat continues to be produced in spent fuel rods to require them to spend a minimum of one year, and more typically 10 to 20 years, in a spent fuel pool of water, before being further processed. However, the heat produced during this time is still only a small fraction (less than 10%) of the heat produced in the first week after shutdown.If no cooling system is working to remove the decay heat from a crippled and newly shut down reactor, the decay heat may cause the core of the reactor to reach unsafe temperatures within a few hours or days, depending upon the type of core. These extreme temperatures can lead to minor fuel damage (e.g. a few fuel particle failures (0.1 to 0.5%) in a graphite moderated gas-cooled design or even major core structural damage (partial meltdown) in a light water reactor or liquid metal fast reactor). Chemical species released from the damaged core material may lead to further explosive reactions (steam or hydrogen) which may further damage the reactor".
- Decay_heat thumbnail Radioisotope_thermoelectric_generator_plutonium_pellet.jpg?width=300.
- Decay_heat wikiPageExternalLink SpentFuelExplorer.jnlp.
- Decay_heat wikiPageExternalLink page=125.
- Decay_heat wikiPageExternalLink decayhe1b.pdf.
- Decay_heat wikiPageID "1630673".
- Decay_heat wikiPageLength "10038".
- Decay_heat wikiPageOutDegree "50".
- Decay_heat wikiPageRevisionID "653954890".
- Decay_heat wikiPageWikiLink 1999_Blayais_Nuclear_Power_Plant_flood.
- Decay_heat wikiPageWikiLink Alpha_particle.
- Decay_heat wikiPageWikiLink Beta_decay.
- Decay_heat wikiPageWikiLink Beta_particle.
- Decay_heat wikiPageWikiLink Category:Heat_transfer.
- Decay_heat wikiPageWikiLink Category:Nuclear_technology.
- Decay_heat wikiPageWikiLink Cooling_tower.
- Decay_heat wikiPageWikiLink Decay_chain.
- Decay_heat wikiPageWikiLink Decay_energy.
- Decay_heat wikiPageWikiLink Dry_cask_storage.
- Decay_heat wikiPageWikiLink Earth.
- Decay_heat wikiPageWikiLink Electronvolt.
- Decay_heat wikiPageWikiLink Fission_product.
- Decay_heat wikiPageWikiLink Fission_products.
- Decay_heat wikiPageWikiLink Fukushima_Daiichi_nuclear_disaster.
- Decay_heat wikiPageWikiLink Fukushima_I_nuclear_accidents.
- Decay_heat wikiPageWikiLink Gamma_radiation.
- Decay_heat wikiPageWikiLink Gamma_ray.
- Decay_heat wikiPageWikiLink Gamma_rays.
- Decay_heat wikiPageWikiLink Geothermal_energy.
- Decay_heat wikiPageWikiLink Half-life.
- Decay_heat wikiPageWikiLink Half-lives.
- Decay_heat wikiPageWikiLink Heat.
- Decay_heat wikiPageWikiLink KW.
- Decay_heat wikiPageWikiLink Kinetic_energy.
- Decay_heat wikiPageWikiLink Loss-of-coolant_accident.
- Decay_heat wikiPageWikiLink MeV.
- Decay_heat wikiPageWikiLink Neutrino.
- Decay_heat wikiPageWikiLink Neutrinos.
- Decay_heat wikiPageWikiLink Nuclear_accidents.
- Decay_heat wikiPageWikiLink Nuclear_and_radiation_accidents_and_incidents.
- Decay_heat wikiPageWikiLink Nuclear_fission.
- Decay_heat wikiPageWikiLink Nuclear_fission_product.
- Decay_heat wikiPageWikiLink Nuclear_reactor_safety_systems.
- Decay_heat wikiPageWikiLink Nuclear_safety_systems.
- Decay_heat wikiPageWikiLink Nuclear_waste.
- Decay_heat wikiPageWikiLink Potassium.
- Decay_heat wikiPageWikiLink Power_history.
- Decay_heat wikiPageWikiLink Radioactive_decay.
- Decay_heat wikiPageWikiLink Radioactive_waste.
- Decay_heat wikiPageWikiLink Radioisotope_thermoelectric_generator.
- Decay_heat wikiPageWikiLink SCRAM.
- Decay_heat wikiPageWikiLink Scram.
- Decay_heat wikiPageWikiLink Shutdown_(nuclear_reactor).
- Decay_heat wikiPageWikiLink Spent_fuel_pool.
- Decay_heat wikiPageWikiLink Spent_nuclear_fuel.
- Decay_heat wikiPageWikiLink Thorium.
- Decay_heat wikiPageWikiLink Three_Mile_Island.
- Decay_heat wikiPageWikiLink Three_Mile_Island_Nuclear_Generating_Station.
- Decay_heat wikiPageWikiLink Tonne.
- Decay_heat wikiPageWikiLink Uranium.
- Decay_heat wikiPageWikiLink Watt.
- Decay_heat wikiPageWikiLink File:Decay_heat_illustration2.PNG.
- Decay_heat wikiPageWikiLink File:Radioisotope_thermoelectric_generator_plutonium_pellet.jpg.
- Decay_heat wikiPageWikiLinkText "Decay heat – Power reactors in shutdown".
- Decay_heat wikiPageWikiLinkText "Decay heat".
- Decay_heat wikiPageWikiLinkText "cool-down".
- Decay_heat wikiPageWikiLinkText "decay heat".
- Decay_heat wikiPageWikiLinkText "decay to lower heat producing levels".
- Decay_heat wikiPageWikiLinkText "heat released by the decay".
- Decay_heat wikiPageWikiLinkText "radioactive heat".
- Decay_heat wikiPageWikiLinkText "reactors began to overheat".
- Decay_heat wikiPageWikiLinkText "reactors overheated".
- Decay_heat wikiPageWikiLinkText "residual (decay) heat".
- Decay_heat wikiPageWikiLinkText "residual heat".
- Decay_heat wikiPageWikiLinkText "thermally".
- Decay_heat hasPhotoCollection Decay_heat.
- Decay_heat wikiPageUsesTemplate Template:Reflist.
- Decay_heat subject Category:Heat_transfer.
- Decay_heat subject Category:Nuclear_technology.
- Decay_heat hypernym Heat.
- Decay_heat type PowerStation.
- Decay_heat type Physic.
- Decay_heat comment "Decay heat is the heat released as a result of radioactive decay.".
- Decay_heat label "Decay heat".
- Decay_heat sameAs حرارة_الاضمحلال.
- Decay_heat sameAs Nachzerfallswärme.
- Decay_heat sameAs Calor_por_desintegración_nuclear.
- Decay_heat sameAs گرمای_واپاشی.
- Decay_heat sameAs Puissance_résiduelle.
- Decay_heat sameAs Liekamoji_šiluma.
- Decay_heat sameAs Ciepło_powyłączeniowe.
- Decay_heat sameAs m.05j1dd.
- Decay_heat sameAs Остаточное_тепловыделение.
- Decay_heat sameAs Q1662393.
- Decay_heat sameAs Q1662393.
- Decay_heat wasDerivedFrom Decay_heat?oldid=653954890.
- Decay_heat depiction Radioisotope_thermoelectric_generator_plutonium_pellet.jpg.
- Decay_heat isPrimaryTopicOf Decay_heat.