– Agreement Addresses Urgent Waste Management Issue –

BERKELEY, CA – Deep Fission Inc. (Deep Fission), the pioneering nuclear energy startup revolutionizing the industry by placing reactors a mile underground, and Deep Isolation, a leader in deep borehole nuclear waste disposal solutions, have signed a Memorandum of Understanding (MOU) to collaborate on spent fuel management for Deep Fission’s advanced underground reactors. This agreement marks a shared commitment to ensuring a comprehensive approach to the full nuclear fuel cycle.

Under this MOU, Deep Isolation and Deep Fission will explore the potential licensing and use of Deep Isolation’s patented underground disposal technology for managing spent nuclear fuel and radioactive waste from Deep Fission’s underground reactors. This partnership enables Deep Fission to offer an end-to-end solution that includes both energy generation and long-term waste management.

Through this collaboration, Deep Fission will integrate Deep Isolation’s deep borehole repository technology into its operations, providing international partners with a seamless, long-term waste solution. For U.S. partners, where permanent underground disposal of spent nuclear fuel is still under consideration, this agreement provides a promising storage option while efforts toward a long-term repository continue.

“Nuclear power generation requires a waste disposal solution, and responsible users should plan for waste management from the start,” said Elizabeth Muller, co-founder and CEO of Deep Fission. “Deep geological disposal is the globally preferred approach, and while other countries are advancing underground repositories, there is an opportunity for the U.S. to take further steps in this direction. Deep Isolation’s solution presents an attractive option for Deep Fission as we work toward a sustainable nuclear future.”

“Deep Isolation is proud to partner with Deep Fission to deliver a practical, scalable solution for managing nuclear waste,” said Rod Baltzer, CEO of Deep Isolation. “As new nuclear technologies emerge, a forward-thinking approach to waste disposal is critical. Ensuring that nuclear waste has a reliable and permanent disposal method is essential for the industry’s long-term success.” Pairing Deep Fission’s cutting-edge reactor technology with Deep Isolation’s innovative waste disposal solution marks an important step toward aligning advanced nuclear energy development with proactive waste management. The collaboration represents a major stride toward resolving the long-standing challenge of managing high-level nuclear waste and offers a more integrated approach to nuclear energy management.

About Deep Isolation
Named as one of Goldman Sachs’ 30 top startups in carbon capture, hydrogen power, and nuclear energy, Deep Isolation is the first company commercializing nuclear waste disposal in deep boreholes.  It offers a uniquely tailored solution to help countries complete the necessary steps to dispose of their waste inventories. With 70 patents issued to date, it leverages proven drilling practices to safely isolate waste deep underground in horizontal, vertical, or slanted borehole repositories.

For more information, visit deepisolation.com. 

For media inquiries, please contact:
media@deepisolation.com

About Deep Fission

Deep Fission is revolutionizing the energy landscape with innovative technology that places small modular reactors a mile underground. The team of leading scientists, engineers, and visionaries is driven by a shared commitment to advancing safe, reliable, and affordable low-carbon energy solutions. The company is actively engaged with the Nuclear Regulatory Commission and is pursuing commercial projects worldwide.

For more information, visit deepfission.com.

For media inquiries, please contact:
media@deepfission.com

Disclosure: Liz Muller is the co-founder and former CEO of Deep Isolation. She currently serves as Executive Chair of the company.

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BERKELEY, CA – Deep Isolation, a leader in nuclear waste disposal technology, has successfully completed a multi-year project with the UK government, marking a major step forward in proving the feasibility and commercial readiness of deep borehole disposal solutions. The Energy Entrepreneurs Fund (EEF)-9001 project, monitored by the UK Department for Energy Security and Net Zero (DESNZ), led to the manufacture of a first-of-its-kind disposal canister prototype.

Launched in December 2022, this project was instrumental in validating Deep Isolation’s patented borehole disposal technology for spent nuclear fuel (SNF) and high-level radioactive waste (HLW). Conducted in collaboration with the UK Advanced Manufacturing Research Centre (AMRC), NAC International, Inc. (NAC), and the University of Sheffield (UoS), the effort focused on both canister design validation and assessing the UK’s manufacturing supply chain capabilities.

“This project is a game-changer for deep borehole disposal canisters,” said Rod Baltzer, CEO at Deep Isolation. “It not only validates key aspects of our technology but also advances manufacturability, cost efficiency, and supply chain readiness – paving the way for future deployments.”

A key outcome was the successful fabrication of two prototype canisters designed to encapsulate a pressurized water reactor (PWR) SNF assembly for dry storage, transport, and final disposal. In parallel, Deep Isolation refined its performance models for long-term safety, leveraging corrosion resistance and post-closure gas migration studies, supported by data from a joint U.S. Department of Energy-funded project (SAVANT). These findings strengthen the case for deep borehole disposal as a scalable, retrievable, and regulatory-compliant solution.

“Developing a viable, cost-effective solution for nuclear waste disposal is a critical challenge, and this project has demonstrated the manufacturability and scalability of Deep Isolation’s innovative canister design,” said Charles Carpenter, Head of Research for AMRC’s Nuclear Manufacturing Group.  “By collaborating with industry leaders, we’ve not only validated key technical aspects, but also identified pathways to strengthen the supply chain for advanced nuclear waste disposal solutions. We are proud to have partnered with Deep Isolation and others on this groundbreaking effort.”

The project elevated Deep Isolation’s technology readiness level (TRL) from TRL 3 to TRL 6, a significant milestone toward deployment. Moreover, AMRC’s assessment of UK manufacturing capabilities identified supply chain challenges, particularly in sourcing the canister shell. The team proposed solutions to reduce manufacturing barriers, leading to projected cost reductions and a clearer pathway for future production at scale.

The performance feedback from this initiative informed an updated canister design, with the second prototype fabricated in early 2025 for additional testing. Deep Isolation will use this prototype to further demonstrate the safety and feasibility of its disposal solutions, strengthening industry confidence and regulatory acceptance.

About Deep Isolation
Named as one of Goldman Sachs’ 30 top startups in carbon capture, hydrogen power, and nuclear energy, Deep Isolation is the first company commercializing nuclear waste disposal in deep boreholes.  It offers a uniquely tailored solution to help countries complete the necessary steps to dispose of their waste inventories. With 87 patents issued to date, it leverages proven drilling practices to safely isolate waste deep underground in horizontal, vertical, or slanted borehole repositories. 

For media inquiries or further information, please contact:

media@deepisolation.com
Deep Isolation
2001 Addison St., Suite 300
Berkeley, CA 94704
www.deepisolation.com

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