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Related Concept Videos

Nuclear Power02:36

Nuclear Power

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Controlled nuclear fission reactions are used to generate electricity. Any nuclear reactor that produces power via the fission of uranium or plutonium by bombardment with neutrons has six components: nuclear fuel consisting of fissionable material, a nuclear moderator, a neutron source, control rods, reactor coolant, and a shield and containment system.
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Nuclear fuel consists of a fissile isotope, such as uranium-235, which must be present in sufficient quantity to provide a...
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Many heavier elements with smaller binding energies per nucleon can decompose into more stable elements that have intermediate mass numbers and larger binding energies per nucleon—that is, mass numbers and binding energies per nucleon that are closer to the “peak” of the binding energy graph near 56. Sometimes neutrons are also produced. This decomposition of a large nucleus into smaller pieces is called fission. The breaking is rather random with the formation of a large...
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All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
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Power System Three-Phase Short Circuits01:21

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Determining the subtransient fault current in a power system involves representing transformers by their leakage reactances, transmission lines by their equivalent series reactances, and synchronous machines as constant voltage sources behind their subtransient reactances. In this analysis, certain elements are excluded, such as winding resistances, series resistances, shunt admittances, delta-Y phase shifts, armature resistance, saturation, saliency, non-rotating impedance loads, and small...
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Nuclear Transmutation03:20

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Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
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Zones of Protection01:16

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In power systems, the entire setup is divided into protective zones to isolate faults and protect the rest of the network. These zones include generators, transformers, buses, transmission lines, distribution lines, and motors. Each zone can be visualized as a separate room in a house, with each room protected by its own circuit breaker.
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Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident
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Accident Simulation Study for Nuclear Power Plants Impacting Louisiana: Differences in 2017 vs. 1992 Protective

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    Area of Science:

    • Nuclear Safety
    • Radiological Emergency Preparedness

    Background:

    • Louisiana's radiological emergency program aligns with 2017 EPA guides but uses a child thyroid dose evacuation threshold instead of potassium iodide.
    • Nuclear power plants adhere to the 1992 manual, creating potential discrepancies in recommendations during accidents.

    Purpose of the Study:

    • To predict accident and weather conditions that cause differing state and utility recommendations.
    • To evaluate the impact of updated guidelines on radiological emergency response.

    Main Methods:

    • Simulations of nuclear power plant accidents using RASCAL software and Entergy's system.
    • Modeling older RASCAL methodologies with plant-specific data.

    Main Results:

    • Simulations show varied evacuation scenarios based on dose thresholds (whole body, child thyroid).
    • Accident types like spent fuel fires and loss-of-coolant accidents highlight differing evacuation triggers.
    • Weather conditions significantly influence the divergence of evacuation recommendations.

    Conclusions:

    • State and utility recommendations may differ under specific accident and weather scenarios.
    • Updated guidelines and differing methodologies necessitate careful evaluation for effective emergency planning.
    • Findings can guide states transitioning to the 2017 Protective Action Guides Manual.