You are right, its a GE design. Boiling Water Reactor doesn't say that much, the soviet RBMK (big reactor with tubes) also are of boiling water type. This ORF s

You are right, its a GE design. Boiling Water Reactor doesn't say that much, the soviet RBMK (big reactor with tubes) also are of boiling water type. This ORF story https://noev1.orf.at/stories/504751 https://noev1.orf.at/stories/504751 (in german) claims that the type in Zwentendorf is identical to those in Fukushima (I). Maybe it's not exactly the same type but the designs seem to be very close relatives.