Location: Yerevan
Operator: Armenian Academy of Sciences
Homepage: http://www.yerphi.am
Activities: Founded in 1943, the Institute claims to have about 1400 employees, including 400 researchers and 550 engineers and technicians.  The Institute has a 6GeV electron synchrotron, but most activities at the Institute have been suspended.
Sources:
[1] Alexander Yemelyanenov and Vladimir Popov, eds., Atom bez grifa "sekretno": tochki zreniya, (Berlin: H & P Druck, 1992), p. 34.
[2] T. Sabonis-Chafee, Preliminary Report on Armenia, Center for Nonproliferation Studies report, 10 May 1996.
[3] "General Information YerPhI," http://www.yerphi.am/gen/html.