I've heard that some countries (South Africa, actually) have canceled their PBMR research and some would have you believe that the modular reactors are all dead because of it. I don't know that to be true. South Africa hasn't been the incubator of a whole lot of the technologies we hold dear today, have they? So they couldn't pull off a highly complex nuclear reactor design... and the gasps of surprise come from... whom? I'm just saying that the technology leaders in this world are the USA, China and India and that is how it is. There's nothing wrong with being any one of the hundreds of other nations that aren't the top dogs.
It seems clear to me that the construction companies are inflating the costs of each new nuclear power plant far beyond what is rational, far beyond whatever new government regulation is imposed. Mass produced components for LFTRs or entire mass produced reactor units such as a Pebble Bed Reactor or an SMR will take the opportunity to inflate prices away from the construction contractors. They wanted to be greedy. Good. They just lost their entire future earnings potential. Too bad. If we allow the contractors to set whatever price they want then we're sure to pay through the teeth for each new reactor --and there will be very few built and global climate change will continue unabated.
Here is a short history of their greed:
Several large nuclear power plants were completed in the early 1970s at a typical cost of $170 million, whereas plants of the same size completed in 1983 cost an average of $1.7 billion, a 10-fold increase. Some plants completed in the late 1980s have cost as much as $5 billion, 30 times what they cost 15 years earlier. Inflation, of course, has played a role, but the consumer price index increased only by a factor of 2.2 between 1973 and 1983, and by just 18% from 1983 to 1988. What caused the remaining large increase? Ask the opponents of nuclear power and they will recite a succession of horror stories, many of them true, about mistakes, inefficiency, sloppiness, and ineptitude. They will create the impression that people who build nuclear plants are a bunch of bungling incompetents. The only thing they won't explain is how these same "bungling incompetents" managed to build nuclear power plants so efficiently, so rapidly, and so inexpensively in the early 1970s.
For example, Commonwealth Edison, the utility serving the Chicago area, completed its Dresden nuclear plants in 1970-71 for $146/kW, its Quad Cities plants in 1973 for $164/kW, and its Zion plants in 1973-74 for $280/kW. But its LaSalle nuclear plants completed in 1982-84 cost $1,160/kW, and its Byron and Braidwood plants completed in 1985-87 cost $1880/kW — a 13-fold increase over the 17-year period. Northeast Utilities completed its Millstone 1,2, and 3 nuclear plants, respectively, for $153/kW in 1971, $487/kW in 1975, and $3,326/kW in 1986, a 22-fold increase in 15 years. Duke Power, widely considered to be one of the most efficient utilities in the nation in handling nuclear technology, finished construction on its Oconee plants in 1973-74 for $181/kW, on its McGuire plants in 1981-84 for $848/kW, and on its Catauba plants in 1985-87 for $1,703/kW, a nearly 10-fold increase in 14 years. Philadelphia Electric Company completed its two Peach Bottom plants in 1974 at an average cost of $382 million, but the second of its two Limerick plants, completed in 1988, cost $2.9 billion — 7.6 times as much. A long list of such price escalations could be quoted, and there are no exceptions. Clearly, something other than incompetence is involved.
http://www.phyast.pitt.edu/~blc/book/chapter9.html The article goes on to attempt to excuse the industry for multiplying the costs but shows that neither the regulations nor inflation should have accounted for more than a doubling from 1970 till 1988, the end of the study. Yet we have a 15-fold to 30-fold increase in plant construction costs. Strange, isn't it?
But if we mass produce the reactors and allow the contractors to build only the concrete and steel bunkers to set them in, there is very little room for thievery and greed; and contracts should place the burden of all construction mistakes and delays upon the contractor and all sub-contractors only. If you take away the economic incentive to inflate the costs and put in their place disincentives with real monetary penalties, lo and behold, I believe you will find projects coming in on budget and on time. Mistakes and lack of quality or failure to pass inspections would also be solely the responsibility of the contractors.
And mass producing things makes them cheaper and better with higher production numbers. The industry is still treating each new nuclear plant as if it's a custom construction project, much like a Lamborghini is hand crafted from a tiny run of production parts hand-made by craftsmen. Those days need to end for the nuclear industry.
We need a thousand new nuclear power plants in the USA alone. I'd like them all to be Thorium cycle reactors that are mass produced in factories all across the USA. But I'd accept SMRs or other mass produced reactors as long as the costs are kept under control and they are passively safe designs.