Oak Ridge Today

NRC approves construction permit for Hermes reactor

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An image showing the proposed Hermes demonstration reactor by Kairos Power. The test reactor would be built at Heritage Center industrial park in west Oak Ridge. (Image by Kairos Power)

The U.S. Nuclear Regulatory Commission has approved a construction permit for a test reactor at Heritage Center industrial park in west Oak Ridge. The NRC decision was announced Tuesday, and construction could start next year.

The 35-megawatt thermal Hermes demonstration reactor would be built by Kairos Power, which has headquarters in Alameda, California, and a Tennessee operation in Oak Ridge.

Hermes would use molten salt to cool its reactor core. It would not generate electricity. Instead, it would provide operational data to support the development of a larger version for commercial power, the NRC said.

“A critical step on Kairos Power’s iterative pathway to commercializing its advanced reactor technology, the Hermes reactor will demonstrate the company’s ability to deliver clean, safe, and affordable nuclear heat,” the company said in a press release.

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A great technical achievement, Molten Salt Reactor could be entombed

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The Molten Salt Reactor Experiment building at Oak Ridge National Laboratory housed the reactor and offices for operating personnel. The facility was constructed in the 1950s for a nuclear aircraft project and was later expanded significantly and retrofitted to accommodate the MSRE. (Photo courtesy U.S. Department of Energy/Oak Ridge National Laboratory)

The Molten Salt Reactor Experiment building at Oak Ridge National Laboratory housed the reactor and offices for operating personnel. The facility was constructed in the 1950s for a nuclear aircraft project and was later expanded significantly and retrofitted to accommodate the MSRE. (Photo courtesy U.S. Department of Energy/Oak Ridge National Laboratory)

 

Note: This story was updated at 8:30 p.m.

Former director Alvin Weinberg once called it the greatest technical achievement at Oak Ridge National Laboratory. It was inspired by the campaign to build a nuclear-powered aircraft in the 1950s, and it was the first reactor to ever operate using uranium-233.

Now parts of the Molten Salt Reactor Experiment that are too radioactively “hot” for humans could be entombed in concrete.

For now, the idea is only under study, and there is no guarantee that any part of the Molten Salt Reactor Experiment, a nuclear historic landmark that has been dormant for decades, will be entombed.

But it’s one of the proposals being evaluated by the U.S. Department of Energy’s Oak Ridge Office of Environmental Management. The goal is to finish the evaluation by the end of the year.

Jay Mullis, manager of the Oak Ridge Office of Environmental Management, presented the proposal to the Oak Ridge City Council and Site Specific Advisory Board in two separate meetings earlier this month. The entombment proposal is one of five items being evaluated as part of a 45-day review started by DOE’s Environmental Management, or EM, program in June. [Read more…]