"This isn’t going to be good for anyone"– Seinfeld
This has the possibility to be at best a moderately good idea, but also could go terribly wrong. This type of reactor can’t have a graphite explosion like Chernobyl, but could still release a large amount of radioactivity if the containment is breached. Because there is no secondary containment structure, it is vulnerable to attack or accident, and because it can be moored in a populated area, the danger could be much greater.
In any case, the reactor has to be disposed of in some way at the end of its life–which is still not a good thing given the fuel will remain radioactive for many thousands of years.
so, hope one of these won’t come to your waterfront anytime soon!