Nuclear reactorA nuclear reactor is a device used to initiate and control a fission nuclear chain reaction or nuclear fusion reactions. Nuclear reactors are used at nuclear power plants for electricity generation and in nuclear marine propulsion. Heat from nuclear fission is passed to a working fluid (water or gas), which in turn runs through steam turbines. These either drive a ship's propellers or turn electrical generators' shafts. Nuclear generated steam in principle can be used for industrial process heat or for district heating.
Void coefficientIn nuclear engineering, the void coefficient (more properly called void coefficient of reactivity) is a number that can be used to estimate how much the reactivity of a nuclear reactor changes as voids (typically steam bubbles) form in the reactor moderator or coolant. Net reactivity in a reactor is the sum total of multiple contributions, of which the void coefficient is but one. Reactors in which either the moderator or the coolant is a liquid typically will have a void coefficient value that is either negative (if the reactor is under-moderated) or positive (if the reactor is over-moderated).
Chernihiv OblastChernihiv Oblast (Черні́гівська о́бласть), also referred to as Chernihivshchyna (Черні́гівщина), is an oblast (province) in northern Ukraine. The administrative center of the oblast is the city of Chernihiv. Within the oblast are 1,511 settlements. Population: The total area of the province is around 31,900 km2. On the west, the oblast is bordered by the Kyiv Reservoir of the Dnieper River and Kyiv Oblast, which has a enclave known as Slavutych, which was created from Chernihiv Oblast for the inhabitants of Chernobyl following the Chernobyl disaster.
Boric acidBoric acid, more specifically orthoboric acid, is a compound of boron, oxygen, and hydrogen with formula . It may also be called hydrogen orthoborate, trihydroxidoboron or boracic acid. It is usually encountered as colorless crystals or a white powder, that dissolves in water, and occurs in nature as the mineral sassolite. It is a weak acid that yields various borate anions and salts, and can react with alcohols to form borate esters. Boric acid is often used as an antiseptic, insecticide, flame retardant, neutron absorber, or precursor to other boron compounds.
Background radiationBackground radiation is a measure of the level of ionizing radiation present in the environment at a particular location which is not due to deliberate introduction of radiation sources. Background radiation originates from a variety of sources, both natural and artificial. These include both cosmic radiation and environmental radioactivity from naturally occurring radioactive materials (such as radon and radium), as well as man-made medical X-rays, fallout from nuclear weapons testing and nuclear accidents.
George MonbiotGeorge Joshua Richard Monbiot (ˈmɒnbioʊ ; born 27 January 1963) is a British writer known for his environmental and political activism. He writes a regular column for The Guardian and is the author of a number of books. Monbiot grew up in Oxfordshire and studied zoology at the University of Oxford. He then began a career in investigative journalism, publishing his first book Poisoned Arrows in 1989 about human rights issues in West Papua.
PhytoremediationPhytoremediation technologies use living plants to clean up soil, air and water contaminated with hazardous contaminants. It is defined as "the use of green plants and the associated microorganisms, along with proper soil amendments and agronomic techniques to either contain, remove or render toxic environmental contaminants harmless". The term is an amalgam of the Greek phyto (plant) and Latin remedium (restoring balance).
Radioactive wasteRadioactive waste is a type of hazardous waste that contains radioactive material. Radioactive waste is a result of many activities, including nuclear medicine, nuclear research, nuclear power generation, nuclear decommissioning, rare-earth mining, and nuclear weapons reprocessing. The storage and disposal of radioactive waste is regulated by government agencies in order to protect human health and the environment.
Strontium-90Strontium-90 () is a radioactive isotope of strontium produced by nuclear fission, with a half-life of 28.8 years. It undergoes β− decay into yttrium-90, with a decay energy of 0.546 MeV. Strontium-90 has applications in medicine and industry and is an isotope of concern in fallout from nuclear weapons, nuclear weapons testing, and nuclear accidents. Naturally occurring strontium is nonradioactive and nontoxic at levels normally found in the environment, but 90Sr is a radiation hazard.
TASSThe Russian News Agency TASS (Informatsionnoye agentstvo Rossii, or Information agency of Russia), abbreviated TASS (ТАСС), is a Russian state-owned news agency founded in 1904. It is the largest Russian news agency and one of the largest news agencies worldwide. TASS is registered as a Federal State Unitary Enterprise, owned by the Government of Russia. Headquartered in Moscow, it has 70 offices in Russia and in the Commonwealth of Independent States (CIS), "along with 56 global branches in 53 countries".
