Westinghouse has signed a contract with Rolls-Royce SMR to develop a fuel design for the British firm’s small modular reactor program, the companies announced last week.

The design work, to be undertaken in the United Kingdom and the United States, will include associated core components and will be based on an existing Westinghouse pressurized water reactor fuel assembly design.

At a joint press conference in the White House East Room last week, President Biden and U.K. Prime Minister Rishi Sunak—in Washington for two days of discussions with the president, members of Congress, and business leaders—debuted a new bilateral agreement dubbed the Atlantic Declaration for a Twenty-First Century U.S.-U.K. Economic Partnership.