Established in 1955, PO Sever produced non-nuclear components for the Soviet nuclear weapons program. The first shipment of components was delivered in 1958, a year after inauguration of its production facilities.[1]

In the wake of Rosatom's consolidation of its nuclear weapons activities, PO Sever appears to be one of two remaining sites (along with the Urals Electromechanical Plant), where Russia produces non-nuclear components for its nuclear munitions.[2] Since the 1990s, PO Sever has added advanced conventional weapons technologies and other components for the aviation and nuclear industries to its production range.[3]

Sources:
[1] "История" [History], PO Sever website, undated, www.posever.ru (accessed 8 October 2012).
[2] See the original list at Oleg Bukharin, "Downsizing Russia's Nuclear Warhead Production Infrastructure," The Nonproliferation Review, Spring 2001, p. 117.
[3] "История" [History], PO Sever website, undated, www.posever.ru (accessed 8 October 2012).