A preliminary conceptual design study for a very low activation fusion plasma core experimental facility is presented. Low activation is achieved by using only very low activation materials in the inner shield (graphite blocks), vacuum vessel (Al/SiC composite alloy), outer shield (SiC/B4C) and magnets (Aluminum). The mechanical configuration of the vacuum vessel is a water-flooded double-shell. It is capable of carrying 1.5 MN in hoop compression with a reserve factor of two over the equatorial 0.8 m zone during plasma disruption. Hands-on access to the vacuum vessel and auxiliary equipment provide a high degree of operability, maintainability and flexibility in experimental program. Problem areas are in further development of the aluminum alloy and composite materials for the vacuum vessel and in cost reduction of high purity low activation materials.