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Nuclear Waste

by | 30-05-2017 19:08



What is Nuclear Waste?
Nuclear waste is the material that nuclear fuel becomes after it is used in a reactor. From the outside, it looks exactly like the fuel that was loaded into the reactor assemblies of metal rods enclosing fuel pellets. But since nuclear reactions have occurred, the contents aren?t quite the same. Nuclear energy is released when a nuclear fuel atom snaps into two. The key component of nuclear waste is the leftover smaller atoms, known as fission products.

Uses of nuclear waste?
In practice, the spent fuel is never unshielded. It is kept underwater (water is an excellent shield) for a few years until the radiation decays to levels that can be shielded by concrete in large storage casks. Options for final disposal include deep geologic storage and recycling. (The sun would consume it nicely if we could get into space, but since rockets are so unreliable, we can?t afford to risk atmospheric dispersal on lift-off.)

How much nuclear waste does nuclear energy create?
If all the electricity use of the USA was distributed evenly among its population, and all of it came from nuclear power, then the amount of nuclear waste each person would generate per year would be 39.5 grams. That's the weight of 7 U. S. quarters of waste, per year! A detailed description of this result can be found here. If we got all our electricity from coal and natural gas, expect to have over 10,000 kilograms of CO2/yr attributed to each person, not to mention other poisonous emissions directly to the biosphere (based on EIA emissions data).
Nuclear waste and its influence on environment

Nuclear wastes are normally classified as low, medium or high-level, according to the amount and types of radioactivity they contain. The high-level waste produced by nuclear reactors is the longest lasting contamination risk of a nuclear power plant.

The European Pressurised Reactor (EPR) is a so-called ?Generation III? design of nuclear reactor, designed to use fuel more efficiently. But the amount of dangerous materials in spent nuclear fuel increases significantly with the time the fuel stays in the reactor. Studies have shown that nuclear fuel from EPRs will be up to seven times more hazardous per unit of electric output because of the drastic increases in the amount of easily released, dangerous and long-lasting isotopes such as iodine-129 (1) that that produced by existing nuclear reactors(2).

All of the options for handling nuclear waste have potentially large environmental and health impacts: waste disposal sites have the potential to contaminate the environment for hundreds of thousands of years(3) if the radionuclide dispersion barriers fail transports of high-level waste or plutonium are at risk from accidents or deliberate attacks and reprocessing facilities have large routine emissions of radioactive substances.

The impacts of a chosen method of waste management should be included in the EIA if one has not yet been selected then impacts of all possibilities – whether waste is buried on site, transported elsewhere for disposal or reprocessed - should be assessed.

The Jaitapur EIA report ignores the impact of nuclear waste, and questions raised about it during the public hearing have been given conflicting answers. Some say that the waste will be transported away from the site for reprocessing others indicate that the government will later decide upon establishing a reprocessing facility on site. No assessment of the impacts of either of these is presented. Questions about high-level waste are answered with information about low and medium-level wastes.

Photo source
www.whatisnuclear.com

 Sources 
                                                                                        
 (1) The amount of iodine-129 instantly released, if and when the nuclear waste dump leaks, is seven times as large in the case of the high burn-up waste produced bythe EPR reactor, compared to typical currently operating world reactors.
(2) Posiva 2008, Environmental Impact Assessment Report, p. 137. www.posiva.fi/files/519/Posiva_YVA_selostusraportti_en_lukittu.pdf, Nagra (2004): Estimates of the Instant Release Fraction for UO2 and MOX Fuel at t=0.
www.nagra.ch/g3.cms/s_page/83220/s_name/shopproductdetail1/s_element/142590/s_level
/10190/s_product/20408/searchkey/Instant%20Release%20Fraction
(3) It takes 240,000 years for radioactive plutonium to decay to a level that is safe for human exposurehttp://www.greenpeace.org/international/en/publications/reports/deadly-legacy/