Before revision: The plant's owner switched to uranium fuel, which was used until the reactor was permanently shut down in 1974., Current industrial activity Currently the only isotopes used as nuclear fuel in most countries are uranium-235 (U-235), uranium-238 (U-238) and plutonium-239, although the proposed thorium fuel cycle has advantages.
After revision: The plant's owner switched to uranium fuel, which was used until the reactor was permanently shut down in 1974., Current industrial activity Currently the only isotopes used as nuclear fuel are uranium-235 (U-235), uranium-238 (U-238) and plutonium-239, although the proposed thorium fuel cycle has advantages.