Engineering360: "Hyundai plans US micro nuclear reactor facility"

How much nuclear waste per MKW produced?

What happens to the nuclear waste?

What Papadoc said. More generally, it is a fairly common practice to tout the upside benefits of any technology while minimizing the downside. One way this shows up is the privatization of the upside (profits) while socializing the downside (cleanup). Every Superfund site started out as a profitable opportunity.

This has been the case for dumping waste into rivers, smokestack emissions (from power plants), nuclear waste (Yucca Mountain), etc.

With this sort of history it would seem important to ask many questions about any possible socialized costs of an energy production system that is said simply to produce hydrogen as a by product. And this is doubly important if profit is a motive for the development and deployment of the technology.

The cleanup must be included in the cost to determine the marketable price of the product. There must be a profit or the project won't happen. But all costs including cleanup and safeguards must be included.

You have hit upon the crux of the matter: The profits are (often much) greater when the downside costs are socialized (ignored). Google "Superfund Cleanup".