TerraPower is a nuclear reactor design spin-off company investigating a class of nuclear fast reactors called the traveling wave reactor (TWR).

One of TerraPower’s primary investors is Bill Gates. Whereas standard light water reactors such running worldwide use enriched uranium as fuel and need fuel reloads every few years, TWRs, once started, use depleted uranium instead and are considered to be able to operate for up to 100 years without fuel reloading.


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