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Pakistan’s Khushab nuclear site, located 200 kilometers south of Islamabad, is dedicated to the production of plutonium for nuclear weapons. Its expansion appears to be part of an effort to increase the production of weapons-grade plutonium, allowing Pakistan to build a larger number of miniaturized plutonium-based nuclear weapons that can complement its existing highly enriched uranium nuclear weapons.
Originally, the site consisted of a heavy water production plant and an estimated 50 megawatt-thermal (MWth) heavy water reactor, both of which became operational in the 1990s. However, Pakistan initiated the construction of a second heavy water reactor between the year 2000 and 2002, a third one in 2006, and a fourth one in 2011.
A recently purchased Digital Globe high resolution satellite image dated January 15, 2015 shows that Khushab’s fourth reactor’s external construction is complete and has become operational. This assessment is based on the presence of a very specific signature: steam is venting from the reactor’s cooling system.

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