I've given the example of the Darlington reactor. The Darlington reactor is a standard CANDU reactor with essentially more and longer pressure tubes, but basically the same technology. Yet when it was put into service, there were unforeseen vibrations in the primary circuit, which produced long delays in starting up the reactor and commercial service.
The European power reactor of Areva, for example, has its first series built in Finland. It is way behind schedule and way behind budget. For me, it's not actually a law that it is like this, but you can just infer it from many such things that have happened. Also, in the United States, in the early eighties or so, I think some things like that happened.
I've never had the design of the MAPLE in my hands, but consider that one MAPLE was already working, and that is the HANARO reactor in Korea. It's a 30-megawatt reactor, which tells me that it has more fuel bundles, maybe longer ones, but certainly a larger number, so the dimensions of the core are different. So to have surprises when you go to similar technology but just have a reduction in size is not really surprising.