What are the 4 types of nuclear waste?
Answers
The various types of nuclear waste include
1. uranium tailings
2. transuranic (TRU) waste
3. low-level waste
4. intermediate-level waste
high-level waste and spent fuel rods.
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Answer:
1) Low-level nuclear waste
Mainly generated from nuclear fuel cycle, low-level waste includes materials that have been contaminated by radioactive substances. It also includes items that gain radioactive property after getting exposed to neutron radiation.
The low-level waste consists of clothing, wiping rags, mops, filters, reactor water treatment residues, equipments and tools, luminous dials, medical tubes, swabs, and injection needles, among others. When mixed with hazardous waste, the waste acquires special status as mixed low-level waste (MLLW).
The mixed waste must meet regulations stipulated for treatment, storage, and disposal for both LLW and hazardous waste. While most of the low-level waste is not highly radioactive, some waste may possess radioactivity to a significant level.
Low-level radioactive waste storage. (Credit: F. Schmidt/Shutterstock)
2) Intermediate-level nuclear waste
As it contains higher amounts of radioactive materials compared to low level waste, the waste requires needs special shielding. It comprises chemical sludges, resins, nuclear reactor parts and contaminated materials from decommissioned reactors.
For disposal, the intermediate-level waste may be solidified in concrete. While short-lived waste that primarily include non-fuel materials from reactors is dumped in shallow repositories, a geological repository is used to deposit long-lived waste.
3) High-level nuclear waste
This type of waste is produced after nuclear fuel is burnt and removed from the nuclear reactors. The waste comprises highly-radioactive fission products and transuranic elements produced in the core of a nuclear reactor.
High-level waste accounts for more than 95% of the radioactivity released in the power generation process from nuclear sources. As the high-level waste produces a significant amount of heat, it needs cooling. While handling and transporting the waste, it should be shielded to avoid harmful exposure. As high-level waste contains irradiated nuclear fuel rods, exposure to the unshielded waste at close range can result in immediate death of humans.
In October 2016, four national and Texas groups had urged the US Nuclear Regulatory Commission (NRC) to terminate its review of the license application for the controversial plan by Waste Control Specialists (WCS) to construct an interim high-level nuclear waste dump in Andrews County, Texas. WCS seeks a permit to build and operate the supposedly short-term storage facility for up to 40,000 metric tons of highly dangerous nuclear waste in Andrews County.
Modern medium to high level transport container for nuclear waste. (Credit: Dalibor Sevaljevic/Shutterstock)
4) Uranium tailings
The waste byproducts that are formed after the extraction of uranium from the ore are uranium tailings. They are radioactive sludge that remains after the uranium-bearing substances are removed from the ore. Uranium is mined from the ore using a heap leaching process. Radium that decays to generate radon is one of those radioactive materials that is found in uranium tailings.
Uranium tailings are found to retain a significant level of radioactivity levels present in the ore due to the presence of long lived decay products. The waste is considered hazardous as it contains several radioactive nuclides that include thorium-230, radium-226, radon-222 (radon gas) and the daughter isotopes of radon decay, including polonium-210.
The waste can enter food chain if is stored on open ground, as the wind can carry the radioactive sand to long