h/t Instapundit
[Ars Technica] - One hope buoying nuclear energy advocates has been the promise of "small modular reactor" designs. By dividing a nuclear facility into an array of smaller reactors, they can largely be manufactured in a factory and then dropped into place, saving us from having to build a complex, possibly one-of-a-kind behemoth on site. That could be a big deal for nuclear’s persistent financial problems, while also enabling some design features that further improve safety.
On Friday, the first small modular reactor received a design certification from the US Nuclear Regulatory Commission, meaning that it meets safety requirements and could be chosen by future projects seeking licensing and approval.
The design comes from NuScale, a company birthed from research at Oregon State University that has received some substantial Department of Energy funding. It’s a 76-foot-tall, 15-foot-wide steel cylinder (23 meters by 5 meters) capable of producing 50 megawatts of electricity. (The company also has a 60-megawatt iteration teed up.) They envision a plant employing up to 12 of these reactors in a large pool like those used in current nuclear plants.
The basic design is conventional, using uranium fuel rods to heat water in an internal, pressurized loop. That water hands off its high temperature to an external steam loop through a heat exchange coil. Inside the plant, the resulting steam would run to a generating turbine, cool off, and circulate back to the reactors.
The design also uses a passive cooling system, so no pumps or moving parts are required to keep the reactor operating safely. The pressurized internal loop is arranged so that it allows hot water to rise through the heat exchange coils and sink back down toward the fuel rods after it cools. |