ruby sparks
Contributor
1) Coal and oil fired plants need just about as much water.
2) You don't need 15,000 locations. It's common to site several reactors in close proximity.
3) The enrichment plant and ore processing aren't located with the plant anyway. They don't need the water and exclusion zone.
Yeah, the metal breaks down in time. You don't need to replace everything, though, just the reactor itself. Just build a new one on the site of the old one.
Nuclear waste: Although nuclear technology has been around for 60 years, there is still no universally agreed mode of disposal. It’s uncertain whether burying the spent fuel and the spent reactor vessels (which are also highly radioactive) may cause radioactive leakage into groundwater or the environment via geological movement.
1) We need to pull our heads out of our ass and reprocess the spent fuel. What's left after that will decay to ambient in 10,000 years. We have plenty of disposal schemes that would be quite adequate to safely contain it for this long.
2) Coal generates far more hazardous material (the fly ash.) It's not a threat due to radioactivity so it never decays to safety. Consider the storage needed to handle one year's worth of fly ash. For the same amount of power that volume can handle the nuke waste for all eternity (because after 10,000 years you can pull the stuff back out.)
Accident rate: To date, there have been 11 nuclear accidents at the level of a full or partial core-melt. These accidents are not the minor accidents that can be avoided with improved safety technology; they are rare events that are not even possible to model in a system as complex as a nuclear station, and arise from unforeseen pathways and unpredictable circumstances (such as the Fukushima accident). Considering that these 11 accidents occurred during a cumulated total of 14,000 reactor-years of nuclear operations, scaling up to 15,000 reactors would mean we would have a major accident somewhere in the world every month.
Look at the death toll. All power sources kill people, nuke as the lowest fatality rate for the amount of power generated.
Proliferation: The more nuclear power stations, the greater the likelihood that materials and expertise for making nuclear weapons may proliferate. Although reactors have proliferation resistance measures, maintaining accountability for 15,000 reactor sites worldwide would be nearly impossible.
1) Thorium reactors pose no proliferation threat at all.
2) Normally operated power reactors are not a meaningful threat. The fuel rods stay in too long. The desired reaction is U-238 + n -> U-239. U-239 undergoes beta decay to Np-239 which undergoes beta decay to Pu-239. However, there is also the reaction Pu-239 + n -> Pu-240. The longer you leave the fuel rods in the more of the Pu-239 gets converted to Pu-240. Too much Pu-240 will poison your bomb, causing it to detonate while it's still imploding. This robs the bomb of most of it's power.
Uranium abundance: At the current rate of uranium consumption with conventional reactors, the world supply of viable uranium, which is the most common nuclear fuel, will last for 80 years. Scaling consumption up to 15 TW, the viable uranium supply will last for less than 5 years. (Viable uranium is the uranium that exists in a high enough ore concentration so that extracting the ore is economically justified.)
That's U-235 abundance. That doesn't count breeder reactors, nor does it count thorium reactors.
Exotic metals: The nuclear containment vessel is made of a variety of exotic rare metals that control and contain the nuclear reaction: hafnium as a neutron absorber, beryllium as a neutron reflector, zirconium for cladding, and niobium to alloy steel and make it last 40-60 years against neutron embrittlement. Extracting these metals raises issues involving cost, sustainability, and environmental impact. In addition, these metals have many competing industrial uses; for example, hafnium is used in microchips and beryllium by the semiconductor industry. If a nuclear reactor is built every day, the global supply of these exotic metals needed to build nuclear containment vessels would quickly run down and create a mineral resource crisis. This is a new argument that Abbott puts on the table, which places resource limits on all future-generation nuclear reactors, whether they are fueled by thorium or uranium.[/I]
And you can't recover them from the worn out reactor??
Fiar points.
Though I would just say that you seem to be comparing nuclear against fossil fuels, not against other alternatives.