Barrier

{
  "id": "MLC-T-ENV-002744",
  "term": "Barrier",
  "field": "Environment",
  "definition": "1. Any material or structure that prevents or substantially delays movement of water or radionuclides toward the accessible environment.For example, a barrier may be a geologic structure, a canister, a waste form with physical and chemical characteristics that significantly decrease the mobility of radionuclides, or a material placed over and around waste, provided that the material or structure substantially delays movement of water or radionuclides.\n\n2. Any material, structure, or feature that, for a period to be determined by NRC, prevents or substantially reduces the rate of movement of water or radionuclides from the Yucca Mountain repository to the accessible environment, or prevents the release or substantially reduces the release rate of radionuclides from the waste. For example, a barrier may be a geologic feature, an engineered structure, a canister, a waste form with physical and chemical characteristics",
  "references": [
    "40 CFR 191.12 (CFR 2018)",
    "Definition truncated. For full definition, see 40 CFR 197.12"
  ],
  "url": "https://mlchart.com/terminology/environment/barrier/"
}