Transuranic waste

Transuranic waste

Transuranic waste is defined as:

Waste containing more than 100 nanocuries of alpha-emitting transuranic isotopes per gram of waste with half-lives greater than 20 years, except for high-level radioactive waste...All TRU elements are heavier than uranium, have several isotopes, and are typically man-made. Keyradionuclides found in TRU waste include americium-241 and several isotopes of plutonium.

Transuranic waste (TRUW) as stated by U.S. regulations is, independent of state or origin, waste which has been contaminated with alpha emitting transuranic radionuclides, possessing half-lives greater than twenty years, and in concentrations greater than 100 nCi/g (3.7 MBq/kg)(Excluding High Level Wastes). Elements having atomic numbers greater than that of uranium are called transuranic ("after uranium"). Because of the elements' longer half-lives, TRUW is disposed more cautiously than LLW and ILW. In the U.S. it is a byproduct of weapons production, and consists of protective gear, tools, residue, debris and other items contaminated with small amounts of radioactive elements (mainly plutonium).

Under U.S. law, TRUW is further categorized into "contact-handled" (CH) and "remote-handled" (RH) on the basis of radiation dose measured at the surface of the waste container. CH TRUW has a surface dose rate not greater than 200 mrem per hour (2 mSv/h), whereas RH TRUW has a surface dose rate of 200 mrem per hour (2 mSv/h) or greater. CH TRUW does not have the very high radioactivity of high level waste, nor its high heat generation, but RH TRUW can be highly radioactive, with surface dose rates up to 1000 rem per hour (10 Sv/h)Fact|date=August 2008. The United States currently permanently disposes of TRUW generated from nuclear power plants and military facilities at the Waste Isolation Pilot Plant. [10]

The Waste Isolation Pilot Plant(WIPP), a geologic disposal facility where packages of TRU waste are emplaced in an underground salt dome is the only area in the US for disposal of transuranic wastes. Other countries do not include this category, favoring variations of High, Medium, and Low Level waste.

External links

* [http://www.wipp.energy.gov/library/acrsl/Chapter1.pdf Final Environmental Assessment for Actinide Chemistry and Repository Science Laboratory - Citing a DOE TRU Definition]
* [http://www.wipp.energy.gov/ US Department of Energy's page on the Waste Isolation Pilot Plant (WIPP)]


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать реферат

Look at other dictionaries:

  • Waste Isolation Pilot Plant — The Waste Isolation Pilot Plant, or WIPP, is the world s second underground repository (after closure of the Germany s Asse Salt Mine in 1977) licensed to safely and permanently dispose of transuranic radioactive waste that is left from the… …   Wikipedia

  • Radioactive waste — 2007 ISO radioactivity danger logo, designed in part for long term radioactive waste depositories which might survive into a far future time in which all knowledge of the meaning of present common radiation danger symbols and signs has been lost… …   Wikipedia

  • Low level waste — (LLW) is a term used to describe nuclear waste that does not fit into the categorical definitions for high level waste (HLW), spent nuclear fuel (SNF), transuranic waste (TRU), or certain byproduct materials known as 11e(2) wastes, such as… …   Wikipedia

  • High level waste — (HLW) is a type of nuclear waste that arises from the use of uranium fuel in a nuclear reactor and nuclear weapons processing. It contains the fission products and transuranic elements generated in the reactor core. HLW accounts for over 95% of… …   Wikipedia

  • Nuclear Waste Policy Act — During the first 40 years that nuclear waste was being created in the United States, no legislation was enacted to manage its disposal. Nuclear waste, some of which remains dangerously radioactive with a half life of more than one million years,… …   Wikipedia

  • high level waste — noun radioactive waste from spent reactor fuel, which contains the fission products and transuranic elements generated in the reactor core; the most dangerous form of radioactive waste. Abbrev.: HLW Compare low level waste …   Australian-English dictionary

  • Deep geological repository — Technicians emplacing transuranic waste at the Waste Isolation Pilot Plant, near Carlsbad, New Mexico A deep geological repository is a nuclear waste repository excavated deep within a stable geologic environment (typically below 300 m or 1000… …   Wikipedia

  • Savannah River Site — The Savannah River Site (SRS) is a nuclear materials processing center in the United States state of South Carolina, located on land in Aiken, Allendale and Barwnell Counties adjacent to the Savannah River 25 miles from Augusta, Georgia. It is… …   Wikipedia

  • Nuclear reactor — Core of CROCUS, a small nuclear reactor used for research at the EPFL in Switzerland This article is a subarticle of Nuclear power. A nuclear reactor is a device to initiate and control a sustained nuclear chain reaction. Most commonly they are… …   Wikipedia

  • Nuclear reactor technology — This article is a subarticle of Nuclear power .A nuclear reactor is a device in which nuclear chain reactions are initiated, controlled, and sustained at a steady rate, as opposed to a nuclear bomb, in which the chain reaction occurs in a… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”