[en] 8GeV synchrotron radiation facility (SPring-8: Super Photon ring 8GeV) is now under construction by the Science and Technology Agency (RIKEN-JAERI Joint Team) in Harima Science Garden City in Hyogo Prefecture, and is scheduled to begin operation in 1997. SPring-8 is a high brilliant synchrotron radiation source, so special emphasis is placed on the vacuum system components of the storage ring. IHI has carried out joint research with RIKEN on the vacuum components since 1987 to develop manufacturing techniques. In experimental tests of the prototype vacuum chamber, a pressure of 10^-9 Pa could be attained, much lower than the required valve 10^-7 Pa. (author)