Oak Ridge Today

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…]

Synthetic material from ORNL used in discovery of new elements 115, 117

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ORNL Berkelium-249

Berkelium-249, contained in the greenish fluid in the tip of the vial, was crucial to the experiment that discovered element 117. It was made in the research reactor at the U.S. Department of Energy’s Oak Ridge National Laboratory. (Photo by ORNL)

 

Twenty-two milligrams of a very pure synthetic material produced at Oak Ridge National Laboratory were used in the discovery of two new chemical elements that will help fill out the seventh row of the periodic table.

The synthetic element, berkelium-249, was produced in a project that started with a six-month irradiation of a target material at the High Flux Isotope Reactor at ORNL. The resulting product was separated and processed during a three-month period at the lab’s Radiochemical Engineering Development Center.

The berkelium-249 was then shipped to the Joint Institute for Nuclear Research, or JINR, in Dubna, Russia, where it was intensely bombarded, or irradiated, with calcium-48 ions, creating six atoms of element 117, said Jim Roberto, ORNL associate lab director for science and technology partnerships. Berkelium-249, which does not exist in nature, has a 300-day lifetime, so researchers had a short time to do their experiments.

Element 117 is one of four new elements that have been officially verified by the International Union for Pure and Applied Chemistry. The IUPAC announced the discoveries on December 30. The other three are elements 113, 115, and 118. Element 115 is produced when element 117 decays. [Read more…]