Deep Isolation provides technology for the permanent disposal of spent nuclear fuel and high-level radioactive waste in deep boreholes. The approach combines deep borehole disposal with a standardized canister system, the Universal Canister System (UCS), to isolate nuclear waste deep underground.

The method uses directional drilling technology to construct deep boreholes in geologic formations selected for their long-term stability and isolation from the biosphere. Depending on site conditions, the disposal section may be vertical, slanted, or horizontal. Waste is emplaced in corrosion-resistant canisters within the disposal zone, where multiple engineered and natural barriers work together to provide long-term isolation. The canisters and borehole seals form part of the engineered barrier system, while the surrounding rock acts as a natural barrier that limits groundwater movement and radionuclide transport.

Because the approach draws on established drilling methods from the energy industry, boreholes can be constructed reliably and at a projected lower cost than alternatives in long-term disposition, and waste can be placed precisely in deep, stable environments without requiring underground human access.

Disposal can take place at or near existing storage sites, reducing the need to transport waste long distances. The disposal sequence is straightforward: a borehole is drilled and lined with steel casing; waste is loaded into canisters, welded closed, and lowered into the waste disposal section using standard oil and gas techniques.  Following emplacement, the access portion of the borehole is sealed with engineered materials such as clay, cement, or crushed rock, creating additional barriers that work together with the waste package and surrounding geology to support long-term isolation.

The UCS supports the full lifecycle of waste management, including transportation, storage, and disposal, and is designed so that once waste is encapsulated, the package never needs to be reopened, reducing risks associated with cost and radiological dose exposure. It was developed through the U.S. Department of Energy ARPA-E Project UPWARDS, advanced under Project SAVANT, and is being validated in the company’s full-scale demonstration program.

Mined repository concepts rely on large underground facilities of tunnels and rooms excavated in rock, typically a few hundred to about a thousand meters deep. They require removing significant volumes of rock and building extensive surface and underground infrastructure for construction, operation, and closure. A mined repository also typically concentrates a large amount (or all) of a nation’s waste at a central location, which has historically made siting politically difficult.

Deep Isolation instead uses small diameter boreholes constructed using directional drilling technology. These can extend from a few hundred meters to several kilometers deep and can be vertical, slanted, or horizontal depending on the geology of the site. Because boreholes require far less excavation than mined repositories, they can be constructed with a smaller surface and subsurface footprint. Waste emplacement and retrieval operations are performed from the surface, eliminating the need for human beings to operate underground.

One of the key advantages of borehole disposal is its flexibility. Because suitable geologic formations exist in many regions, disposal facilities can be developed where appropriate geology, regulatory requirements, and community support align.

Nuclear waste disposal is a global challenge, and the approach is designed to adapt to many geologic settings. Deep Isolation’s technology is designed for disposal at depths of approximately 1 to 3 kilometers (3/4 of a mile to 2 miles), depending on the disposal location. In all cases the waste is intended to be placed far below aquifers, in zones where water has had no contact with the surface for thousands to millions of years.

Depth alone does not provide isolation; the surrounding geology is equally important. Deep Isolation’s approach is designed for geologic formations that have demonstrated long-term stability and limited groundwater movement. Suitable host formations typically have low permeability and geochemical conditions that slow the transport of radionuclides. These characteristics can be found in a variety of rock types, including sedimentary formations, salt deposits, and some crystalline rocks.

At disposal depths, geologic conditions often provide additional barriers that help limit the movement of water and radioactive material. Combined with the engineered disposal system, these natural barriers support long-term isolation. Suitable formations exist in many regions and are evaluated through detailed site characterization studies.

Deep Isolation’s approach is designed to protect workers, the public, and the environment at every stage, from handling and emplacement through long-term isolation underground.

During handling and emplacement, the process uses methods already proven in the nuclear industry. Spent fuel is moved with shielded systems, remote operations, and trained personnel under strict procedures that minimize exposure.

Once underground, safety is provided through multiple engineered and natural barriers. These include the waste canister, borehole seals, and the surrounding geologic formation, which are designed to work together to isolate radioactive material over long periods of time. Disposal sites are selected based on characteristics such as geologic stability and limited groundwater movement that support long-term isolation.

The company also evaluates long-term performance through detailed safety analyses, including how radionuclides might move through groundwater over very long timescales. Safety and performance assessment models project long term radiation exposure several orders of magnitude below NRC limits for the waste streams and host rock studied. These analyses are used to design systems that meet strict regulatory standards, with targets well below established limits.

Yes. Deep Isolation’s systems support monitoring and operational control throughout disposal. During emplacement, downhole instrumentation measures temperature and radiation conditions, and after closure, monitoring continues through surface and near surface systems.

The NRC requires waste to be retrievable for a defined period of time, and the drilling industry routinely retrieves objects and instruments from boreholes using standard techniques.  Deep Isolation’s deep borehole disposal technology is designed to meet these retrievability requirements.

Importantly, the same complexity that allows controlled retrieval also strengthens security. Retrieving waste requires setting up a rig and using specialized equipment to pull canisters one at a time, which makes unauthorized access highly impractical.  Both emplacement and retrieval have been demonstrated in field testing, including a 2019 demonstration, and are being further validated in the full-scale demonstration program.

Depth and geology provide strong physical barriers on top of conventional security measures. Spent fuel placed thousands of feet underground and sealed behind rock, cement, or clay is far harder to access than material in surface storage. As described above, any retrieval would require specialized rigs and a slow, conspicuous operation, which offers substantial protection against theft or diversion.

Permanent disposal can also reduce the long-term proliferation footprint of a fuel cycle by placing fissile material in a final, monitored, and difficult to access state rather than leaving it in indefinite surface storage.

The system is designed to be flexible and can be deployed at or near existing reactor sites or at regional or centralized facilities, depending on geology, regulatory, and stakeholder preferences. This flexibility makes it easier to work with local communities and can reduce the need for long distance transport.

Facilities are developed in collaboration with communities and states who determine that deep geologic disposal is their preferred option. Many communities already store waste above ground and placing it deep underground can offer a more permanent solution without transporting through communities. Deep Isolation will only work with communities and states that support permanent isolation, and a community that is not interested can continue to advocate for interim storage or another disposal facility.

The decision is complex and weighs benefits such as a timely safety improvement, reduced transportation, local jobs, and land use fees against the community’s own priorities. Deep Isolation’s role is to help communities and states make an informed choice. With more than 60 U.S. sites currently storing waste above ground, several have expressed interest in exploring the option.

Deep Isolation’s Universal Canister System is designed to handle a range of waste forms, including spent nuclear fuel from conventional light water reactors and various advanced reactors, along with high-level radioactive waste such as that generated from reprocessing technology. The standardized canister allows waste to be packaged once and carried through transportation, storage, and disposal in the same container, without ever needing to reopen it.

The approach continues to allow for the waste streams of advanced reactors and recycled or reprocessed fuel, which is significant as the industry expands. Safety and performance assessment modeling has examined high level radioactive waste from fuel recycling processes placed in deep boreholes, supporting the system’s relevance to next generation fuel cycles.

Demand for clean, reliable power, including power generated for data centers and advanced manufacturing, is driving renewed investment in nuclear energy and a new generation of reactors. A frequent concern raised about that growth is the absence of a permanent waste solution.

Deep Isolation’s view is that disposal is the missing piece of nuclear expansion. Building a credible permanent disposal pathway can reduce financial and regulatory risk for reactor projects, support licensing, and strengthen public trust that new nuclear comes with a complete plan for its waste. In this sense, permanent disposal is enabling infrastructure for the broader nuclear buildout.

Because the method uses standard directional drilling rather than large excavated facilities and disturbs far less rock, it is designed to be cost effective and scalable, often projected on the order of half the cost of an analogous mined facility. Costs can be matched to need, with modular implementation that scales borehole by borehole rather than requiring a single very large up-front facility. Siting repositories at or near existing storage locations can also avoid substantial long-distance transportation costs.

Permanent geologic disposal in the United States is regulated primarily by the NRC, with the Department of Energy and the framework established by the Nuclear Waste Policy Act also central. Deep Isolation designs its systems to meet NRC dose-based safety standards and works within established regulatory processes. Broad deployment of borehole disposal at scale would benefit from updates to the existing legal framework, and the company engages with policymakers and states to support a collaboration-based path that complements current law.

Deep Isolation has progressed from concept to field testing to full scale demonstration. A 2019 demonstration validated canister emplacement and retrieval in directional boreholes, and the company reports more than 100 issued patents worldwide.

The current focus is a multi-year, full scale demonstration program at the Deep Borehole Demonstration Center near Cameron, Texas, launched with a groundbreaking in early 2026 and carried out with a team of industry collaborators. The program is designed to validate handling, emplacement, and retrieval at full scale using non-radioactive materials, with initial canister emplacement targeted for 2027.

Yes. Nuclear waste is a global challenge, and suitable geology exists in many regions worldwide. The approach is designed to adapt to different geologic, regulatory, and community settings following detailed site study, which is why Deep Isolation works with government waste management programs internationally.