N-Reactor

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The N-Reactor at the Hanford site along the Columbia River.
The N-Reactor at the Hanford site along the Columbia River.

The N-Reactor was a graphite-moderated nuclear reactor constructed during the Cold War and operated by the U.S. Government at the Hanford Site in Washington.

It was a one-of-a-kind design in the U.S., being both a power reactor used to feed the civilian electrical power grid via the Washington Public Power Supply System (WPPSS), and a plutonium production reactor for nuclear weapons.

Like all of the Hanford reactors (except the later civilian Columbia Generating Station and the Fast Flux Test Facility), N-Reactor was built without a containment building. In this respect, it was like the Chernobyl reactor. Also, both had graphite cores.

The reactor was placed on cold standby in 1988, with "final disposition" beginning in 1994.

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