Nuclear waste management

From Citizendium
Jump to navigation Jump to search
This article is developing and not approved.
Main Article
Discussion
Related Articles  [?]
Bibliography  [?]
External Links  [?]
Citable Version  [?]
 
This editable Main Article is under development and subject to a disclaimer.
See also: Nuclear_power_reconsidered

This article is intended to answer the questions raised in Nuclear power reconsidered.

Fig.3 Radioactivity over time of each major isotope in spent fuel from a nuclear reactor [1]

How much waste is produced compared to other sources of energy? How will it be contained, and what are the dangers to people and the environment? Like questions on safety, public perception of the dangers of nuclear waste is much worse than historical data shows.[2] The volume of waste per per terawatt-hour is 100,000 times less than coal.[3] Even if we look only at radioactivity released to the environment,[4] watt-for-watt nuclear power is 100 times less than coal.[5]

Much of the worry about nuclear waste centers around the long life of some isotopes in the waste (See Fig.3). There is concern about leakage into the environment decades or even centuries from now. Billion-dollar efforts to bury the waste deep under a mountain have only heightened public fears. Dry-cask storage at the power plants has proven to be a safe but temporary solution.[6] This interim storage has the advantage of being able to recover the "waste" and use it in newer reactors that can use the remaining 95% of available energy.

Transportation of wastes from reactors to disposal or reprocessing sites must be done safely. Leakage into groundwater and ocean water near shore is a special concern. New reactor designs must address these concerns, even though they go beyond the design of the reactor itself. Will the waste be solid or liquid? Will it require special casks, or even special vehicles for transportation on public roads? (See Fig.4)

© Photo: Nuclear Fuel Transport Ltd.
Fig.4 Transport of Nuclear Fuel in Japan.[7]

Other worries include the possibility of sabotage or theft of waste material that might be useful in a "dirty bomb". Again, we should evaluate specific plans by considering likely scenarios. Is the storage facility away from any population center and not a target for an airplane crash, a truck bomb, or even a short-range missile? Is there a secure perimeter with intrusion detectors? If there is an intrusion, is cutting through the concrete and steel difficult enough that there will be plenty of time for a response from local law enforcement, or even a nearby military base? (See Fig.5)

© Image: Holtec International
Fig.5 Dry underground storage in the desert, safe but still recoverable.

Interim Storage

It is important that we make a distinction between spent fuel from nuclear power, and the waste from bomb production, which was often done in a rush with little concern for pollution. Spent fuel rods can be stored safely. Weapons waste poses a much bigger problem due to the large variety and sometimes unexpected characteristics of the material to be stored.[8] In evaluating a new reactor design, we must look at the complete fuel cycle, not just the waste from the reactor itself. Are there any problems with the mining, processing, or transportation of the fuel, or with the reprocessing of spent fuel?

After recovery of all the valuable isotopes in spent fuel, there will still be a small remainder of high-level waste. This can be easily and permanently disposed in deep geologic repositories already in use for bomb production waste.[9]

Fig.6 Spent fuel from older reactors should not be treated as waste.
Fig.7 Nuclear weapons waste is a much bigger challenge than spent fuel rods.

Permanent Disposal

Further Reading

Notes and References

  1. https://blogs.egu.eu/network/geosphere/2015/02/02/geopoll-what-should-we-do-with-radioactive-waste/
  2. “Over the last 40 years, thousands of shipments of commercially generated spent nuclear fuel have been made throughout the United States without causing any radiological releases to the environment or harm to the public.” - statement by the Nuclear Regulatory Commission quoted in Storage and Disposal of Radioactive Waste
  3. section 2.2 "A Beautifully Small Problem" in the book Why Nuclear Power has been a Flop.
  4. https://www.epa.gov/radtown/radioactive-wastes-coal-fired-power-plants
  5. https://www.scientificamerican.com/article/coal-ash-is-more-radioactive-than-nuclear-waste/ - The title is a bit misleading. From the article: "In fact, the fly ash emitted by a power plant—a by-product from burning coal for electricity—carries into the surrounding environment 100 times more radiation than a nuclear power plant producing the same amount of energy." "ounce for ounce, coal ash released from a power plant delivers more radiation than nuclear waste shielded via water or dry cask storage."
  6. Connecticut Yankee, a 619 MWe reactor on the Connecticut River, ran for 28 years between 1968 and 1996. The spent fuel from those 28 years is stored in 43 casks on a concrete pad, 70 feet by 228 feet.
  7. https://world-nuclear.org/information-library/nuclear-fuel-cycle/transport-of-nuclear-materials/transport-of-radioactive-materials.aspx
  8. A barrel containing plutonium mixed with kitty litter exploded days after it was "safely" stored at the Waste Isolation Pilot Plant, leading to "Nuclear accident in New Mexico ranks among the costliest in U.S. history" LA Times
  9. See the document Why Salt from the US Department of Energy.