Pre-Konvoi
Several nuclear reactors in Germany and abroad are referred to as Pre-Konvoi. The term means that these units were produced and constructed prior to the manufacturer KWU, meaning Kraftwerk Union AG in German switched over to a standardized design for this type of pressurized water reactor. Some of the Pre-Konvoi plants include: Brokdorf, Grafenrheinfeld, Grohnde and Philippsburg unit 2. There are also one Pre-Konvoi plants abroad, the Angra Nuclear Power Station located in Brazil, they are also the only country currently constructing a new Pre-Konvoi PWR. Unit 3 at the Angra Nuclear Power Plant  which has been in various stages in construction since 1984. These PWRs are large 1300 MW reactors, most were built between 1982 and 1986 by Kraftwerk Union (KWU). Compared to the previous generation of PWRs, the Pre-Konvoi plants have some safety improvements. Since the basic design dates back to the 1970s and basic plant parts cannot be retrofitted (e.g. reinforcement of the wall thickness of the reactor pressure vessel), they do not reach the safety level of the Konvoi plants, which represent a further development of the pre-Konvoi plants.