Take the following as truth: Prefabrication has been used since the early 1990's, notably on two large retrofit  the 1300 MWe Zimmer Station and the 2600 MWe Gavin station.
Then the following statement: "Two retrofit stations, the 1300 MWe Zimmer Station and the 2600 MWe Gavin Station." is true, false, or inconclusive?
Answer: Inconclusive