I have not watched the video but 1:250 ratio is fairly correct. We can't make bombs -- not that easily at least, as it is *very* difficult to get bomb type material from such reactors -- but Th can server our energy need for thousands of year. Virtually all scientists believe that.
Anyway Wiki articles about nuclear reactors are, IMO, pretty nice and valid so as long as you cross check with other references, these are good resources. Also links like below can answer your questions, perhaps better than what I write here: Nuclear Power Reactors
or Advance Power Reactors
Another good resource is Mueller's book "Energy for future presidents" (I have recommended "Physics for future Presidents" book very highly - It is available online too).
A Few points:
- Thorium is much more abundant than uranium
.. more so for India. Enough for 1000's of year.
- Almost all thorium is fertile Th-232
(compared to uranium that is composed of 99.3% fertile U-238 and 0.7% more valuable fissile U-235)
- It is difficult to make a nuclear bomb from a thorium reactor's byproducts.
(Because your rate of getting Pu is about 1/50 of a standard U reactor -- There can be U233 type bombs from Th (theoretically possible and possibly tested/made -- but U232 will poison it and make it very hard to make -- Anyway India has enough (or get plenty Pu239) bomb material.
- There is much less nuclear waste
—1/100 to 1/1000. Not only that the radioactivity of waste drops down to safe levels after just a one or a few hundred years (vs 10,000 years or so for U)
- Since all natural thorium can be used no need for expensive fuel enrichment...
Back to comparing the amount of thorium needed -- per Carlo Rubbia (A Nobel Laureate)'s article/estimation one ton of thorium can produce as much energy as 200 tons of uranium (that is about 3,500,000 tons of coal)
Hope this helps. (For more clarity see the links I posted above or similar links)