B Reactor at the Manhattan Project National Historical Park
The story of the B Reactor includes some of the richest and most significant scientific accomplishments in the world.
It is the story of a community with a singular commitment to ending World War II; of the Manhattan Project, the world's first full-sized reactor; and of the Hanford Reach—the last free flowing, non-tidal stretch of the mighty Columbia River.
It is the story of American Indian tradition, early farming techniques, and railroading. It is the story of environmental research and restoration. From the largest remaining shrub-steppe eco-system in the world, to an "Atomic City" built overnight...it is the story of sophisticated advancements carved from a rugged northwest territory. It is a unique story, and one that will capture the hearts and imaginations of all who visit. The heart of the story is of course the B Reactor.
The Hanford Site's B Reactor was the first full-scale nuclear reactor to operate in world history. It was built by the DuPont Corporation under contract to the Army Corps of Engineers Manhattan Engineer District (MED) to produce plutonium for the United States' military effort in World War II. The Hanford region was selected for the project because of it's desolate landscape with low population. The B Reactor has been recognized as a National Engineering Historic Landmark and a Nuclear Historic Landmark.
The B Reactor building is currently closed to the public while maintenance work is conducted on the facility’s roof. Tours inside the reactor are temporarily suspended and will resume once construction is complete.
Visitors can still experience the history of the Hanford Site through Pre-Manhattan Project Tours, which take guests on a guided bus tour of the Hanford Site and surrounding historic areas. While these tours drive past the B Reactor, visitors are not able to enter the building at this time.
The Pre-Manhattan Project tours operate May through September. Visitors can register and learn more about available tour dates on the Hanford Historic Tours website.
Special group tours for 20 or more can be arranged by calling the Tour Headquarters.
For additional information about the B Reactor visit the B Reactor Museum Association's web site.