The Naval Supply Systems Command Weapon Systems Support (NAVSUP WSS) Nuclear Directorate is dedicated solely to providing logistics and sustainment support to the Naval Nuclear Propulsion Program. We are responsible for the provisioning, procurement, and quality assurance of all components within the secondary system of the Navy's nuclear propulsion plants, also known as nuclear reactors.

U.S. naval nuclear propulsion plants use a pressurized-water reactor design that has two basic systems: the primary system and the secondary system. The primary system circulates ordinary water in an all-welded, closed loop consisting of the reactor vessel, piping, pumps, and steam generators. The heat produced in the reactor core is transferred to the water, which is kept under pressure to prevent boiling. The heated water passes through the steam generators where it gives up its energy. The primary water is then pumped back to the reactor to be heated again.

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