Document: 10 CFR Part 72
Document ID: 7f0e4fcb-5279-47e0-bb28-e7cea02a3a09
Document Type: cfr
Title: Definitions.
Source: 10 CFR Part 72
Source URL: https://www.ecfr.gov/current/title-10/part-72/section-72.3
Revision Date: 
Chapter: 
Section ID: 72.3
CFR Part: 72
CFR Title: 10

Content:
es Code ; or ( 2 ) Any land selected by an Alaska Native village or regional corporation under the provisions of the Alaska Native Claims Settlement Act ( 43 U.S.C. 1601 et seq. ). Site means the real property on which the ISFSI or MRS is located. Source material means— ( 1 ) Uranium or thorium, or any combination thereof, in any physical or chemical form or ( 2 ) Ores that contain by weight one-twentieth of one percent (0.05%) or more of: ( i ) Uranium, ( ii ) Thorium, or ( iii ) Any combination thereof. Source material does not include special nuclear material. Special nuclear material means— ( 1 ) Plutonium, uranium-233, uranium enriched in the isotope 233 or in the isotope 235, and any other material which the Commission, pursuant to the provisions of section 51 of the Act, determines to be special nuclear material, but does not include source material; or ( 2 ) Any material artificially enriched by any of the foregoing but does not include source material. Spent fuel storage cask or cask means all the components and systems associated with the container in which spent fuel or other radioactive materials associated with spent fuel are stored in an ISFSI. Spent nuclear fuel or Spent fuel means fuel that has been withdrawn from a nuclear reactor following irradiation, has undergone at least one year's decay since being used as a source of energy in a power reactor, and has not been chemically separated into its constituent elements by reprocessing. Spent fuel includes the special nuclear material, byproduct material, source material, and other radioactive materials associated with fuel assemblies. Structures, systems, and components important to safety means those features of the ISFSI, MRS, and spent fuel storage cask whose functions are— ( 1 ) To maintain the conditions required to store spent fuel, high-level radioactive waste, or reactor-related GTCC waste safely; ( 2 ) To prevent damage to the spent fuel, the high-level radioactive waste, or