The Grafenrheinfeld interim storage facility is located on the site of the Grafenrheinfeld nuclear power plant and is enclosed within the nuclear power plant site. This means that CASTOR casks only need to be moved a short distance from the reactor building to the interim storage facility and that no public roads need to be used. The entire site is protected by a security perimeter fence.
The site houses two storage areas with a capacity of 88 spaces: Storage area 1 has a surface area of 670 m² for 40 spaces; storage area 2 covers 760 m² for 48 spaces. Casks are stored in 5 or 6 double rows, each with 8 spaces.