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Related Concept Videos

Nuclear Power02:36

Nuclear Power

7.7K
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.
Nuclear Fuels
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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Nuclear Transmutation03:20

Nuclear Transmutation

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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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Nuclear Fission02:50

Nuclear Fission

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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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Nuclear Fusion02:45

Nuclear Fusion

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The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
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Related Experiment Video

Updated: Jun 8, 2025

Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident
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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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A multidisciplinary framework from reactors to repositories for evaluating spent nuclear fuel from advanced reactors.

Haruko M Wainwright1,2, Chloe Christiaen3, Milos Atz

  • 1Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, USA. hmwainw@mit.edu.

Scientific Reports
|November 6, 2024
PubMed
Summary

A new framework compares advanced reactor spent nuclear fuel disposal. Waste form, not just volume, dictates repository performance and environmental impact, influencing nuclear energy sustainability.

Keywords:
Performance assessment of nuclear waste disposalRadionuclide transport modelRepository footprintSmall-modular reactorsSpent Nuclear fuel

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Area of Science:

  • Nuclear Engineering
  • Environmental Science
  • Computational Science

Background:

  • Advanced reactor designs produce spent nuclear fuel (SNF) with varying characteristics.
  • Previous comparative analyses of SNF disposal have yielded inconsistent conclusions.
  • A unified framework is needed to assess SNF disposal across different reactor types.

Purpose of the Study:

  • To develop and demonstrate a multidisciplinary framework for comparing advanced reactor SNF disposal.
  • To identify key factors influencing repository performance and environmental impact.
  • To support informed decision-making for sustainable nuclear energy.

Main Methods:

  • Utilized OpenMC for neutronics and fuel depletion simulations.
  • Employed NWPY to calculate repository footprint under thermal constraints.
  • Used PFLOTRAN for geosphere radionuclide transport and performance assessment.
  • Conducted a meta-analysis of prior comparative studies.

Main Results:

  • Repository footprint is not solely dependent on SNF volume or decay heat due to thermal constraints.
  • Fast reactors exhibit higher Iodine-129 inventories, a key dose contributor.
  • Waste form significantly impacts repository performance, with TRISO-based fuels showing smaller footprints despite larger volumes.

Conclusions:

  • Avoid sweeping conclusions about advanced reactor SNF; specificity matters.
  • Repository performance is primarily dictated by waste form properties.
  • The developed open-source framework enhances transparency and traceability in comparative SNF assessments.