How is nuclear waste managed?

Nuclear waste symbolizes the dual nature of modern science. It is a hazardous, radioactive byproduct from fields such as nuclear medicine, nuclear armament production, and nuclear energy plants. In essence, it serves as a reminder of humanity’s incredible technological progress, but also reveals our struggle to manage the repercussions of those very advancements.

Radioactive waste exists in various forms such as gases, liquids, and solids. Depending on its origin, the radioactivity can persist anywhere from mere hours to several millennia. Improper disposal of this waste can wreak havoc on the environment, contaminating the air, water, and soil. Furthermore, these materials pose severe long-term health risks to humans, potentially leading to fatal outcomes.

The majority of nuclear waste is generated by nuclear power production. The primary byproducts include spent nuclear fuel from reactors and high-level waste (HLW) resulting from the reprocessing of spent nuclear fuel.

In nuclear power plants, reactors utilize ceramic uranium dioxide pellets as fuel, which are enclosed in metal rods. Once the usable uranium has been depleted from these rods, they must be disposed of. The rods are often treated with chemicals to extract any remaining uranium, creating HLW, a form of liquid waste. Afterward, these rods are typically stored in water-filled pools near the reactor until a permanent disposal solution is established.

Currently, over 29,000 tons of spent fuel rods are stored globally. In the United States, many of these rods remain in storage near power plants due to the limited availability of permanent disposal facilities.

Low-level waste, often generated from hospitals or laboratories, can be compacted or incinerated before being disposed of in landfills. Intermediate-level waste, including reactor parts, chemicals, and similar materials, which possess higher levels of radioactivity, is typically solidified in concrete or bitumen before being buried deep underground.

Although HLW constitutes only a small fraction of all nuclear waste, it is responsible for 95 percent of the radioactivity emitted by nuclear waste. To store HLW, it is often converted into glass and sealed inside stainless-steel containers, which are then buried deep underground at government-approved sites. In some cases, HLW is stored in underground tanks or silos as well.

Identifying suitable sites for radioactive waste disposal is a challenging task. In essence, no community is eager to have nuclear waste stored nearby, even if it is entombed in a remote vault in the desert. A prominent example of the difficulties surrounding nuclear waste disposal is the proposed Yucca Mountain storage facility, situated in Nevada about 100 miles (160.9 kilometers) northwest of Las Vegas.

In 2002, U.S. President George W. Bush authorized the development of the Yucca Mountain facility. However, the project has faced significant opposition from various groups. In 2010, President Obama expressed his intention to halt the project, citing concerns about the long-term stability of the site. Critics argue that the threat of earthquakes and groundwater flow could potentially breach the vault, allowing radioactive waste to leak.

As a result, the United States continues to face challenges with nuclear waste disposal. Experts stress that permanent disposal sites need to be established soon, or the country risks being overwhelmed with radioactive waste that no one is willing to accommodate.