Country |
Tonnes U3O8 |
% of World |
Australia |
894,000 |
25% |
Kazakhstan |
681,000 |
19% |
Canada |
507,000 |
14% |
South Africa |
335,000 |
9% |
Nambia |
291,000 |
8% |
Brazil |
281,000 |
8% |
Russian Fed. |
195,000 |
5% |
USA |
130,000 |
4% |
World Total |
3,638,000 |
|
Waste Class |
Definition |
High-Level Waste (HLW) |
the highly radioactive material resulting from the reprocessing of spent nuclear fuel, including liquid waste produced directly in reprocessing and any solid material derived from such liquid waste that contains fission products in sufficient concentrations; also other highly radioactive material that the Commission, consistent with existing law, determines by rule requires permanent isolation |
Spent Nuclear fuel (SNF) |
Fuel that has been withdrawn from a nuclear reactor following irradiation, the constituent elements of which have not been separated by reprocessing. |
Transuranic Waste (TRUW) |
This class is specfic to waste streams from DOE and comprises "material contaminated with elements that have an atomic number greater than 92, including neptunium, plutonium, americium, and curium, and that are in concentrations greater than 10 nanocuries per gram, or in such other concentrations as the Nuclear Regulatory Commission may prescribe to protect the public health and safety." This definition was revised in 1984 by DOE Order 5820.2 to be "Without regard to source or form, waste that is contaminated with alpha-emitting transuranium radionuclides withhalf-lives greater than 20 years and concentrations greater than 100nCi/g at the time of assay." |
By Product Material Uranium Mining and Mill Tailings |
"any radioactive material (except special nuclear material) yielded in or made radioactive by exposure to the radiation incident to the process of producing or utilizing special nuclear material, and the tailings or wastes produced by the extraction or concentration of uranium or thorium from any ore processed primarily for its source material content." The tailings or wastes produced by the extraction or concentration of uranium or thorium from any ore processed primarily for its source material content. |
Naturally Occuring and Accelerator produced Radioactive Materials (NORM/NARM) |
"Radioactive material that is not high-level radioactive waste, spent nuclear fuel, or byproduct material); and the Nuclear Regulatory Commission, consistent with existing law and in accordance with paragraph (A), classifies as low-level radioactive waste." This does not exclude commercial waste containing TRU materials. In the government sector, TRUW is excluded. LLW is divided into two broad categories: waste that qualifies for near-surface burial, and waste that requires deeper disposal (Greater than Class C LLW, or greater confinement waste). LLW that is regulated by the NRC and qualifies for near surface burial is separated into the three classes described in Table 2. DOE LLW is subclassified according to facility-specific limitations. |
LLW Waste Class |
Definition |
Class A |
Low levels of radiation and heat, no shielding required to protect workers or public, rule of thumb states that it should decay to acceptable levels within 100y. |
Class B |
Has higher concentrations of radioactivity than Class A and requires greater isolation and packaging (and shielding for operations) than Class A waste. |
Class C |
Requires isolation from the biosphere for 500 years. Must be buried at least 5mbelow the surface and must have an engineered barrier (container and grouting). |
Greater Than Class C |
This is the LLW that does not qualify for near-surface burial. This includes commercial transuranics (TRUs) that have half-lives>5y and activity>100nCi/g. |
Material Designation |
Definition |
Special Nuclear Material (SNM) |
" plutonium, uranium enriched in the isotope 233 or in the isotope 235, and any other material which the Commission, pursuant to the provisions of section 2071 of [title 42 of the USC], determines to be special nuclear material, but does not include source material; or any material artificially enriched by any of the foregoing, but does not include source material." |
Source Material |
Material that is essential to the production of special nuclear material. "uranium, thorium, or any other material which is determined by the Commission pursuant to the provisions of section 2091 of [title 42 of the U.S.C.] to be source material; or ores containing one or more of the foregoing materials, in such concentration as the Commission may by regulation determine from time to time." |
By Product Material |
" any radioactive material (except special nuclear material) yielded in or made radioactive by exposure to the radiation incident to the process of producing or utilizing special nuclear material, and the tailings or wastes produced by the extraction or concentration of uranium or thorium from any ore processed primarily for its source material content." |
Transuranic Material (TRU) |
Material containing or contaminated with elements that have an atomic number greater than 92. |
Contact Handled (CH) |
Materials or packages with a surface exposure rate < 200mR/h may be handled without shielding for radiation workers. |
Remote Handeled (RH) |
Materials or packages with a surface exposure rate >200mR/h must be handled remotely for protection of radiation workers. Individual sites may have upper limits, as well |
Hazardous Waste |
Waste that contains both hazardous material, regulated under RCRA by the EPA, and radioactive material, regulated under the AEA and its by the NRC or DOE, is called mixed waste. There are high-level mixed wastes, low-level mixed wastes, and TRU mixed wastes (DOE treats all of its TRU waste as mixed waste). EPA has not yet determined whether SNF will be designated as mixed waste. |
DOE recommended accident rate (per million miles) |
Shipment Miles (millions) over 30 years (Planning Information Corp.) |
Number of Accidents Likely to Occur |
||
TRUCK |
0.7-3.0 |
62.3 |
210-354 |
|
RAIL |
11.9 |
14.0 |
Material |
Weight ,kg. |
Fission Products |
28.8 |
Uranium |
4.8 |
Plutonium |
0.04 |
Neptinium |
0.48 |
Americum |
0.14 |
Curium |
0.04 |
Reprocessing Chemicals |
68.5 |
Total |
102.8 |
Dry Storage
If and when pool capacity is reached, licensees may move toward use of aboveground dry storage casks (NRC, 2000). In this method, spent fuel is surrounded by inert gas inside a container called a cask. To date, the NRC has approved 12 spent fuel casks which are listed in the provided regulations. The casks can be made of metal or concrete, and some can be used for both storage and transportation (NRC, 2000). The storage casks are found within the envelope of the previously approved nuclear power site, and are either placed horizontally, or stand vertically on a concrete pad. All casks used for storage must be approved by the NRC; furthermore, the casks must be designed to resist events such as floods, tornadoes, temperature extremes, earthquakes and even missiles (NRC, 2000). Dry storage casks house SNF that has been previously cooled in a storage pool and is at least five years of age. Typically, the maximum heat generated from the 24 fuel assemblies stored in each cask is less than that given off by 240 100-watt light bulbs (NRC, 2000). Nine nuclear power plants are currently storing spent fuel under the dry storage option. |
Figure 6. Typical dry cask storage container NRC, 2000). |