In this type of thorium breeder reactor, the thorium is just an minor additive to the fuel because most of the fuel is U238 as a proliferation protection mechanism (less than 5% fissile). A thorium reactor produces loads of plutonium 239 because of all that U238 in the fuel as required by nrc regulations.
Also. neptunium-237, is a proliferation risk and is water soluble which makes it a very dangerous nuclear waste that thorium reactors cannot burn that can travel far and wide through the water table. https://en.wikipedia.org/wiki/Neptunium "Neptunium is fissionable, and could theoretically be used as fuel in a fast neutron reactor or a nuclear weapon, with a critical mass of around 60 kilograms. In 1992, the U.S. Department of Energy declassified the statement that neptunium-237 "can be used for a nuclear explosive device". It is not believed that an actual weapon has ever been constructed using neptunium. As of 2009, the world production of neptunium-237 by commercial power reactors was over 1000 critical masses a year, but to extract the isotope from irradiated fuel elements would be a major industrial undertaking. In September 2002, researchers at the Los Alamos National Laboratory briefly created the first known nuclear critical mass using neptunium in combination with shells of enriched uranium (uranium-235), discovering that the critical mass of a bare sphere of neptunium-237 "ranges from kilogram weights in the high fifties to low sixties," showing that it "is about as good a bomb material as [uranium-235]." The United States Federal government made plans in March 2004 to move America's supply of separated neptunium to a nuclear-waste disposal site in Nevada." On Sat, Dec 16, 2017 at 6:43 PM, bobcook39...@hotmail.com < bobcook39...@hotmail.com> wrote: > I think fast breeders generally use a liquid metal as a coolant. That is > not nice to repair or refuel. It leaves a mess to cleanup in the end. > > > > A light water breeder like that in the last Shipping Port reactor is a > better bet that can be back-fitted into light pressurized water reactors. > It bread Th-232 to U-233 and was proven to work in the late 1960’s early > 70’s. > > > > Any fission reactor LEAVES A MESS for future generations, including the > fast breeders. And they have less intrinsic nuclear (physics) safety than > thermal light water reactors to avoid operating accidents. > > > > IMHO India and China do not have the managerial safety ethic to handle the > large fission reactor technology they are betting on. I hope they give up > and focus on LENR R&D. > > > > I would love to see their safety analyses for the new reactor. I bet it > has all sort of holes similar to the design assumptions the Japanese folks > found satisfactory for Fukushima. The first issue is siting it near a > large population—idiocy IMHO. An exclusion zone of 100 km would be > warranted to start with. > > > > Bob Cook > > > > > > . > > > > > ------------------------------ > *From:* Adrian Ashfield <a.ashfi...@verizon.net> > *Sent:* Saturday, December 16, 2017 1:43:08 PM > *To:* email@example.com > *Subject:* [Vo]: Fast breeder thorium reactor > > India about to step up its renewable energy game > https://www.rt.com/business/407709-india-russia-nuclear-reactor/ >