Awesome Conversation I had with a guy from Lawrence Livermore Labs.
"Levon L. - I wonder if they are starting to figure out the palladium-deuterium fusion then."
"Robert Stei**** - Energy scarcity is a larger and more serious problem than CO2 in the atmosphere (more than 2 billion people on a planet of 7 billion have no access to electricity).
As population density increases, diffuse energy schemes, and dedicating the land they require to produce power, will be less and less feasible.
High density energy solutions will be favored in a world of high population density, and forms of energy that produce energy most cleanly will be favored.
Thorium LFTRs can completely extract all of the energy in fertile Thorium fuel (less Thorium ore has to be mined - less nuclear waste has to be sequestered). Practical forms of fusion that produce helium (and very small amounts of Thorium fission products) as nuclear waste use a small amount of U-233 fissile to reliably produce fusion which is about 4X times more energy dense than even Thorium/U-233 fission. The deuterium fuel in the ocean is about 10^8 times more abundant than the official USGS worldwide estimates for economically extractable Thorium. Using U-233 to ignite more abundant fusion deuterium from sea water increases the amount of energy that can be produced from the worldwide Thorium resources by > 100 times.
http://goo.gl/Ji0r2
Note: The complete conversion of deuterium nuclear fuel releases an energy content of 250 x 10^15 joules per metric ton of deuterium. The quantity of deuterium in the world’s oceans is estimated at 4.6 x 10^13 metric tons. Deuterium present in seawater will yield around 5 x 10^11 TW-years of energy.
Worldwide Th-232 estimate from USGS = 1,660,000 metric tons which when fully consumed in a LFTR will produce about 1,660 TW-years of energy.
The deuterium in seawater then is 3.125 x 10^8 times larger an energy resource than the energy that could be produced from worldwide economically extractable Thorium resources."
" Levon L. - Now, how does tritium fit in to the energy equation? I was going over the MAP-21 law and found an interesting little blurb about that. The most I could find about tritium was for nuclear detectors and as a refrigerant (as helium3 ?)."
"Robert Stei**** - Levon, Tritium has industrial uses currently (non-electrically lighted self luminous Exit Signs for public buildings, movie theaters, etc)
http://www.theexitstore.com/exit_sign_info/facts-about-tritium-signs.htm
There will also be a growing market for tritium for D-T fusion in the coming years. It takes about 150 kgs of Tritium and 100 kgs of Deuterium to produce 1GW of fusion power for a year. In contrast, it requires about 1000 kgs of Thorium to produce 1GW of energy in a LFTR reactor for a year.
There are few current sources of tritium, mostly LWRs, and it is expensive. LFTRs could be used to produce Tritium for fusion reactors by wrapping a Lithium blanket (ideally Li-6) around the LFTR and bombarding the lithium with neutrons.
Fusion reactors should ultimately be able to breed their own Tritium sustainably. D-D fusion, a slightly more difficult fusion reaction, produces some Tritium as it operates, Tritium produced in a fusion reactor can be separated from the non-radioactive helium produced in the fusion reactor target chamber, and then used as fuel in D-T fusion reactors.
While most fusion reactor approaches struggle to produce any net energy from even the least taxing D-T fusion reaction, fission ignited fusion started out, in the Ivy Mike test of 1952, producing energy from D-D fusion right from the first test. When you use the high energy density of nuclear fission to initiate fusion, it is much easier to produce fusion in pure D-D fusion plasmas without requiring any Tritium."