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A containment building, in its most common usage, is a steel or concrete structure enclosing a nuclear reactor. It is designed to, in any emergency, contain the escape of radiation despite pressures in the range of 60 to 200 psi ( 410 to 1400 kPa ). The containment is the final barrier to radioactive release, the first being the fuel ceramic itself, the second being the metal fuel cladding tubes, the third being the reactor vessel and coolant system. The steel cable of a colliery winding tower. ...
Concrete being poured, raked and vibrated into place in residential construction in Toronto, Ontario, Canada. ...
Core of a small nuclear reactor used for research. ...
Radiation as used in physics, is energy in the form of waves or moving subatomic particles. ...
The radiation warning symbol (trefoil). ...
Fixed Partial Denture, or Bridge The word ceramic is derived from the Greek word κεÏαμικός (keramikos). ...
In a nuclear power plant, the reactor vessel is a pressure vessel containing the coolant and reactor core. ...
A coolant, or heat transfer fluid, is a fluid which flows through a device in order to prevent its overheating, transferring the heat produced by the device to other devices that utilize or dissipate it. ...
The containment building itself is typically an airtight steel structure enclosing the reactor normally sealed off from the outside atmosphere. The steel is either free-standing or attached to the concrete missile shield. In the United States, the design and thickness of the containment and the missile shield are governed by federal regulations (10 CFR 50.55a) [1]. Image File history File links No higher resolution available. ...
Image File history File links No higher resolution available. ...
For a pressurized water reactor, the containment also encloses the steam generators and the pressurizer, and is the entire reactor building. The missile shield around it is typically a tall cylindrical or domed building. There are several common designs, but for safety-analysis purposes containments are categorized as either "large-dry," "sub-atmospheric," or "ice-condenser." Pressurized water reactors (PWRs) (also VVER if of Russian design) are generation II nuclear power reactors that use ordinary water under high pressure as coolant and neutron moderator. ...
A steam generator is a device used to boil water to create steam. ...
For a boiling water reactor, the containment and missile shield fit close to the reactor vessel. The reactor building wall forms a secondary containment during refueling operations. The containment designs are referred to by the names Mark I (oldest; drywell/torus), Mark II, and Mark III (newest). All three types house a large body of water used to quench steam released from the reactor system during transients. The introduction to this article provides insufficient context for those unfamiliar with the subject matter. ...
It has been suggested that this article be split into articles entitled steam and water vapor, accessible from a disambiguation page. ...
The CANDU system is detailed in the "Nuclear Tourist" Reference below. Multiunit CANDU stations utilize a water spray equipped Vacuum Building to rapidly condense any steam from a postulated break and return containment to subatmospheric conditions. This minimizes any possible fission product release to the environment. The CANDU reactor is a pressurized-heavy water, natural-uranium power reactor designed in the 1960s by a partnership between Atomic Energy of Canada Limited and the Hydro-Electric Power Commission of Ontario as well as several private industry participants. ...
Title 10 of the Code of Federal Regulations, Part 50, Appendix J provides the basic design criteria for lines penetrating the containment wall. Each large pipe penetrating the containment, such as the steam lines, has isolation valves on it, configured as allowed by Appendix J; generally two valves [2]. For smaller lines, one on the inside and one on the outside. For large, high-pressure lines, space for relief valves and maintenance considerations cause the designers to install the Appendix J valves near to where the lines exit containment. In the event of a leak in the high-pressure piping that carries steam and feedwater, these valves on high pressure systems rapidly close to prevent radioactivity from escaping the containment. Valves on lines for standby systems penetrating containment are normally closed. It has been suggested that this article be split into articles entitled steam and water vapor, accessible from a disambiguation page. ...
During normal operation, the containment is air-tight and access is only through marine style airlocks. High air temperature and radiation from the core limit the time, measured in minutes, people can spend inside containment while the plant is operating at full power. In the event of a worst-case emergency, called a "design basis accident" in NRC regulations, the containment is designed to seal off and contain a meltdown. Redundant systems are installed to prevent a meltdown, but as a matter of policy, one is assumed to occur and thus the requirement for a containment building. For design purposes, the reactor vessel's piping is assumed to be breached, causing a "LOCA" (Loss Of Coolant Accident) where the water in the reactor vessel is released to the atmosphere inside the containment and flashes into steam. The resulting pressure increase inside the containment, which is designed to withstand the pressure, triggers containment sprays ("dousing sprays") to turn on to condense the steam and thus reduce the pressure. A SCRAM ("neutronic trip") initates very shortly after the break occurs. The safety systems close non-essential lines into the air-tight containment by shutting the isolation valves. Emergency Core Cooling Systems are quickly turned on to cool the fuel and prevent it from melting. The exact sequence of events depends on the reactor design, for ABWR see [3] pages 15A-37 and -38, for CANDU see [4] slides 21, 23 and 25. A nuclear meltdown occurs when the core of a nuclear reactor melts. ...
A SCRAM is an emergency shutdown of a nuclear reactor - though the term has been extended to cover shutdowns of other complex operations, such as server farms and even large model railroads (see Tech Model Railroad Club). ...
Containment buildings in the U.S. are subjected to Containment Integrated Leakage Rate Tests (CILRTs) on a periodic basis, both to identify the possible leakage in an accident and to locate and fix leakage paths. [5] Motto: (Out Of Many, One) (traditional) In God We Trust (1956 to date) Anthem: The Star-Spangled Banner Capital Washington D.C. Largest city New York City None at federal level (English de facto) Government Federal constitutional republic - President George Walker Bush (R) - Vice President Dick Cheney (R) Independence from...
In the Soviet Union it was normal practice not to build containment buildings. This, along with the unstable nature of the RBMK reactors, led to the catastrophe of the Chernobyl accident [6]. In the case of these types of reactors it would be more proper to refer to the building housing the reactor as a reactor building rather than as a containment building. RBMK is an acronym for the Russian reaktor bolshoy moshchnosti kanalniy (Russian: Реактор Большой МощноÑти Канальный) which means reactor (of) high power (of the) channel (type), and describes a now obsolete class of graphite-moderated nuclear power reactor which was built only in the Soviet Union. ...
The nuclear power plant at Chernobyl prior to the completion of the sarcophagus. ...
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In 1988, Sandia National Laboratories conducted a test of slamming a jet fighter into a large concrete block at 481 miles per hour (775 km/h) [7] [8]. The airplane left only a 2.5-inch deep gouge in the concrete. Although the block was not constructed like a containment building missile shield, it was not anchored, etc., the results were considered indicative. A subsequent study by EPRI, the Electric Power Research Institute, concluded that commercial airliners did not pose a danger. [9] Year 1988 (MCMLXXXVIII) was a leap year starting on Friday (link displays 1988 Gregorian calendar). ...
It has been suggested that Sandia Base be merged into this article or section. ...
A fighter aircraft is a military aircraft designed primarily for attacking other aircraft, as opposed to a bomber, which is designed to attack ground targets, primarily by dropping bombs. ...
The Electric Power Research Institute (EPRI) conducts research on issues of interest to the electric power industry in the USA. EPRI is an independent, nonprofit organization funded by the electric utility industry. ...
The Turkey Point Nuclear Generating Station was hit directly by Hurricane Andrew in 1992. Turkey Point has two fossil fuel units and two nuclear units. Over $90 million of damage was done, largely to a water tank and to a smokestack of one of the fossil-fueled units on-site, but the containment buildings were undamaged [10] [11]. The twin reactors at Turkey Point nuclear power station are on a 3,300 acre (13 km²) site in Homestead, Florida near Miami, Florida, in Dade County, Florida. ...
Lowest pressure 922 mbar (hPa; 27. ...
Year 1992 (MCMXCII) was a leap year starting on Wednesday (link will display full 1992 Gregorian calendar). ...
Fossil fuels are hydrocarbons, primarily coal and petroleum (fuel oil or natural gas), formed from the fossilized remains of dead plants and animals. ...
Release of radioactive gases
The containment building is designed to prevent the release of radioactive materials. During the Three Mile Island accident, small amounts of radioactive gases were released by another mechanism. In addition to accidental release, radioactive gases were deliberately released into the atmosphere by the operators to relieve pressure on the primary system and avoid curtailing the flow of coolant to the core.[1] Three Mile Island Nuclear Generating Station consisted of two pressurized water reactors manufactured by Babcock & Wilcox each inside its own containment building and connected cooling towers. ...
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