• Tokyo Electric Power Co. says it has found water leaks around the bottom of the containment vessel in the reactor 1 building at the Fukushima No. 1 nuclear plant, the first time leaks have been detected near or possibly in any of the three containment vessels that experienced a meltdown in March 2011. (japantimes.co.jp)
  • One leak came from a rupture in a sand-cushioned drain pipe installed at the bottom of the containment vessel. (japantimes.co.jp)
  • The pipe is not directly connected to the containment vessel and is used to drain condensation that forms on the vessel's surface. (japantimes.co.jp)
  • Despite being designed to cool Unit 1 for at least 8 hours, the condensers' limited operation did not reduce the heat in the core and containment vessel. (wikipedia.org)
  • An enormous explosion Saturday morning - possibly due to a buildup of hydrogen gas - destroyed most of a secondary containment building housing the No. 1 reactor, but was reported by a government spokesman not to have breached a critical inner steel liner - the reactor's primary containment vessel. (csmonitor.com)
  • TEPCO announces increase in reactor containment vessel pressure in Fukushima Dai-1 reactor No. 1. (ieee.org)
  • TEPCO says that the primary containment vessel remains intact. (ieee.org)
  • Operators knew the sea water flooding would cause a pressure buildup in the reactor containment vessel -- and potentially lead to an explosion -- but felt they had no choice if they wanted to avoid a complete meltdown. (mbtmag.com)
  • The pressure chamber is encased in a protective steel shell called the primary containment vessel. (ieee.org)
  • Ringing the base of that containment vessel is a doughnut-shaped structure called the torus, which serves a safety function: If pressure rises too high in the pressure vessel, operators can vent steam into the torus through a series of relief valves. (ieee.org)
  • In 2014, the Barakah 1 reactor vessel was delivered onsite and site preparation works for Barakah 3 and 4 started. (wikipedia.org)
  • The drywell, also known as the primary containment vessel (PCV), contains the reactor pressure vessel (RPV). (world-nuclear.org)
  • A small amount of hydrogen is routinely formed by radiolytic decay of water, and this is normally dealt with by recombiners in the containment vessel. (world-nuclear.org)
  • Steam can also be released from the reactor vessel through the safety relief valves and associated piping directly into the suppression pool. (world-nuclear.org)
  • The primary cooling circuit of the BWR takes steam from above the core, in the reactor pressure vessel, to the turbine in an adjacent building. (world-nuclear.org)
  • But first, it has to remove the most radioactive material, which remains in a sealed containment vessel that was briefly (and in unauthorized fashion) painted to resemble an 8-ball . (washingtonian.com)
  • Reactor No. 2 is thought to have a cracked containment vessel and is thus believed to be potentially the most problematic reactor. (latimes.com)
  • Pipes and grates in the reactor's containment vessel were seen in some images. (pearltrees.com)
  • Nonetheless, "the concern would be that it would breach the concrete containment vessel," observes Cheryl Rofer , a nuclear scientist who formerly worked at Los Alamos National Laboratory, if a more direct strike were to occur. (popsci.com)
  • The basic reactor structure-the steel containment vessel, and everything that's inside of it-is probably pretty robust and pretty safe," she says. (popsci.com)
  • The source of the radioactive leak at the earthquake-stricken Fukushima Daiichi nuclear power plant was finally identified by the facility's operator TEPCO to be in the primary containment vessel of reactor 3, authorities reported. (rt.com)
  • Engineers probed the space with a camera and found the water leakage to be near a pipe joint that connects directly to the containment vessel. (rt.com)
  • There is still water inside the containment vessel due to the ongoing flow of the coolant used to keep the stricken reactor's temperature down. (rt.com)
  • The Fukushima Daiichi (Unit 1) reactor, was 1 out of 4 reactors seriously effected during the Fukushima Daiichi nuclear disaster (福島第一原子力発電所事故, Fukushima Dai-ichi) on 11 March 2011. (wikipedia.org)
  • To recap: The Fukushima Daiichi Power Plant has six nuclear reactors. (motherjones.com)
  • The Fukushima Daiichi reactors are GE boiling water reactors (BWR) of an early (1960s) design supplied by GE, Toshiba and Hitachi, with what is known as a Mark I containment. (world-nuclear.org)
  • Working overnight into Sunday, engineers have successfully restored power to cooling pumps in two reactors at the disabled Fukushima Daiichi nuclear power plant, the first genuinely hopeful sign in the week-long battle to prevent a full-scale meltdown at any of the six reactors at the site. (latimes.com)
  • To cool the reactor, operators resorted to the plant's Emergency core-cooling systems (ECCS), including the isolation condensers, and the High Pressure Coolant Injection systems (HPCI). (wikipedia.org)
  • Radiation levels inside the reactor housing were said to be 1,000 times normal, the agency said, but supposedly only eight times normal background at the plant's main gate. (pravda.ru)
  • The power plant's owner, Tokyo Electric Power Company, has been struggling to bring reactor units 1, 2, and 3 under control after last week's earthquake and tsunami caused a massive power failure that disabled the cooling systems. (motherjones.com)
  • The Zaporizhzhia nuclear plant's six reactors are now completely shut off, meaning that it's not making electricity. (popsci.com)
  • In December 2018, it was reported that voids were found in the concrete containment buildings for units 2 & 3. (wikipedia.org)
  • In 2009, the concrete containment building that surrounds Crystal River's nuclear reactor, left, cracked during an upgrade to the facility. (tampabay.com)
  • As a result, the concrete containment wall that houses the reactor cracked in October 2009. (tampabay.com)
  • Potentially radioactive steam was released from the primary circuit into the secondary containment area to reduce mounting pressure in the core. (wikipedia.org)
  • Excess pressure from the wetwell (above 300 kPa) can be vented through the 120 m emission stack via a hardened pipe or into the secondary containment above the reactor service floor of the building. (world-nuclear.org)
  • The secondary containment houses the emergency core cooling systems and the used fuel pool. (world-nuclear.org)
  • Regardless of the strength of these containment vessels, ordinance hitting a nuclear power plant could still have serious follow-on effects. (popsci.com)
  • A few months after reactor 4 of the Chernobyl nuclear power plant went up in toxic flames in 1986, it was encased in a concrete and steel "sarcophagus" to contain the radioactive material inside. (nationalgeographic.com)
  • Like Chernobyl, the reactor just gets hotter and hotter melting everything around it, eventually including the protective chamber designed to contain the radiation. (berkeley.edu)
  • Chernobyl reactor 4, site of the 1986 fire. (theecologist.org)
  • And if there is an attack on a reactor or spent fuel store resulting in a Chernobyl or Fukushima scale catastrophe - whether deliberate or accidental, whether instigated by a nation-state or extra-state group - disaster response measures would likely be chaotic and woefully inadequate. (theecologist.org)
  • Dr. Michio Kaku says the best thing to do is encase the reactor in concrete as they did at Chernobyl, but the Japanese have not accomplished that yet. (uchicago.edu)
  • First, reactor owners pay into a self-insurance pool of $200 million, designed to cover events that fall short of a Chernobyl-style disaster. (nirs.org)
  • Chernobyl and the safety of nuclear reactors in OECD countries : report by an NEA group of experts. (who.int)
  • The BWR Mark I has a primary containment system comprising a free-standing bulb-shaped drywell of 30 mm steel backed by a reinforced concrete shell, and connected to a torus-shaped wetwell beneath it containing the suppression pool (with 3000 m 3 of water in units 2-5). (world-nuclear.org)
  • Overall, the plant had 6 separate boiling water reactors originally designed by General Electric (GE), and maintained by the Tokyo Electric Power Company (TEPCO). (wikipedia.org)
  • F. Tanabe has estimated that the core contained the following materials: Uranium dioxide 78.3 tons Zirconium 32.7 tons Steel 12.5 tons Boron carbide 590 kilograms Inconel 1 ton On 11 March at 14:46 JST, in response to the earthquake, TEPCO successfully scrammed the reactor in Unit 1, shutting down all power-producing nuclear fission chain reactions. (wikipedia.org)
  • At 15:42, TEPCO declared a "Nuclear Emergency Situation" for Units 1 and 2 because "reactor water coolant injection could not be confirmed for the emergency core cooling systems. (wikipedia.org)
  • By midnight, water levels in the reactor were falling and TEPCO gave warnings of the possibility of radioactive releases. (wikipedia.org)
  • Tokyo Electric Power Company (TEPCO) reports that turbines and reactors in three units of the Fukushima Dai-1 Nuclear Power Station , which includes six reactor units in total, automatically shut down. (ieee.org)
  • TEPCO begins venting steam to reduce the growing pressure inside reactor No. 1. (ieee.org)
  • TEPCO announces radiation exposure of one employee, who was working inside Fukushima Dai-1 reactor building, exceeded 100 microsieverts (106.3 microsieverts). (ieee.org)
  • TEPCO begins injecting sea water mixed with boron to cool reactor No. 1. (ieee.org)
  • TEPCO announces that they have been injecting sea water into the reactor core of Fukushima Dai-1's reactor No. 1 and then boric acid to absorb radiation . (ieee.org)
  • Fukushima Dai-1 uses six boiling water reactors to produce electricity for TEPCO. (ieee.org)
  • In the intense heat and pressure of the melting Unit 1 reactor, a reaction between the nuclear fuel metal cladding and the remaining water surrounding it produced explosive hydrogen gas. (wikipedia.org)
  • Apart from this, at low containment pressures hydrogen and other gases are routinely vented through charcoal filters which trap most radionuclides. (world-nuclear.org)
  • It will certainly bring power to valves and controls in the reactor buildings, but most experts believe the cooling pumps in reactors No. 1, 2 and 3 were damaged, both by the hydrogen explosions that occurred in the first four days after the earthquake and by corrosion from the seawater and boron that have been pumped into the reactor. (latimes.com)
  • In the third week, further discoveries of highly radioactive water outside the reactor buildings showed that the contamination was spreading. (ieee.org)
  • In most of Fukushima Dai-1's reactors, the radioactive element uranium is the source of the nuclear fission reaction: when one atom of the uranium isotope U-235 breaks down into smaller parts, it produces both energy and neutrons. (ieee.org)
  • By doing so the overflow will be radioactive and dumped into the sea for as long as it takes to cool the reactor. (berkeley.edu)
  • In any case, the radioactive reactor cores - whether kept in situ or removed from the reactors - would remain vulnerable, as would nuclear waste stores. (theecologist.org)
  • No injection of water into the Reactor Coolant System occurred. (nrc.gov)
  • That aging structure, seen here, was covered with a larger, newer containment housing in 2016. (nationalgeographic.com)
  • What remains of the reactor is now inside a massive steel containment structure deployed in late 2016. (nationalgeographic.com)
  • Although not adopted for current reactors, that strategic vision is embraced in the NRC report NRC Vision and Strategy: Safely Achieving Effective and Efficient Non--Light Water Reactor Mission Readiness, issued in 2016. (ans.org)
  • Lets keep the fingers crossed they can keep the reactor cool somehow. (berkeley.edu)
  • Police and military were also spraying water manually on the other buildings at the site in an effort to keep the reactor cores and the spent fuel pools cooled and prevent a meltdown that would release large amounts of radiation into the environment. (latimes.com)
  • The ceiling of the building that houses the No. 1 reactor collapsed Saturday, injuring 4 workers, Japan's public broadcaster NHK reported. (csmonitor.com)
  • The eyes of the world have been riveted on Japan's Fukushima Dai-1 nuclear power plant and its workers' desperate efforts to stabilize the nuclear reactors. (ieee.org)
  • The possible nuclear meldtown at Japan's nuclear fission reactors, is even more reasoning as to why governments along in conjunction with the private sector should speed up reasearch on viable comercial nuclear fusion reactors. (berkeley.edu)
  • Photo: AP Radiation-blurred images taken inside one of Japan's tsunami-hit nuclear reactors show steam, unidentified parts and rusty metal surfaces scarred by 10 months of exposure to heat and humidity. (pearltrees.com)
  • Despite venting of gases at the reactors, the explosion Saturday morning destroyed the containment building of the No. 1 reactor. (csmonitor.com)
  • The company was trying to channel sea water into the reactor to cover the rods, cool them down and prevent another explosion at the stricken plant. (mbtmag.com)
  • Smoke poured out after the explosion and it is feared the reactor is melting down following the failure of its cooling system. (pravda.ru)
  • On Monday, there was an explosion at Unit 3 that appears to have damaged its reactor core and severely damaged its building. (motherjones.com)
  • This power plant has three reactors, which continue "to operate normally," the IAEA said Monday, following that nearby strike and explosion. (popsci.com)
  • Eventually the reactor was stabilized by switching from freshwater to seawater which was pumped into the reactor. (wikipedia.org)
  • Japanese soldiers were reported pumping seawater into the No. 1 reactor at the Fukushima I power plant 150 miles north of Tokyo , to keep it cool. (csmonitor.com)
  • Any case this reactor is in very serious trouble by using seawater its corrosive and causes rust and salination of hot parts. (berkeley.edu)
  • Meanwhile, workers had jury-rigged an unmanned device that could spray seawater on the No. 3 reactor for up to seven hours at a time and they hoped to install similar devices at other buildings. (latimes.com)
  • The control room was blown to feed sea water to the cores reactor pool. (berkeley.edu)
  • At the time of the earthquake, Reactor 4 had been de-fueled while 5 and 6 were in cold shutdown for planned maintenance. (wikipedia.org)
  • Fires at the building housing reactor No. 4, which was shut down at the time of the earthquake, raised a new set of concerns regarding spent nuclear fuel. (ieee.org)
  • At the time of the earthquake, three reactors were active and three were down for routine maintenance. (ieee.org)
  • Containers of uranium fuel inside the reactor may have begun melting. (pravda.ru)
  • Up to 30 percent of Chernobyl's 190 metric tons of uranium was now in the atmosphere, and the Soviet Union eventually evacuated 335,000 people, establishing a 19-mile-wide "exclusion zone" around the reactor. (nationalgeographic.com)
  • Japanese officials have characterized this reactor as perhaps the most dangerous, because it uses some mixed oxide fuel, or MOX, which includes uranium and plutonium, and presents a more severe radiation threat. (motherjones.com)
  • Reactor No. 3 is not known to be damaged, but its fuel rods contain a mixture of uranium and plutonium. (latimes.com)
  • MOX-Mixed oxide (plutonium and uranium) fuel is known, by its limited use in Europe, to challenge nuclear reactor operation, and is therefore more costly to produce and use than uranium fuel. (nirs.org)
  • Two key physical characteristics of uranium give reactor operators some natural advantage in control of the fission process. (nirs.org)
  • A total of 11 of the nation's 54 reactors shut down following the quake, knocking out about 30 percent of the nation's power . (csmonitor.com)
  • A strike on one warring nation's nuclear reactors or waste stores could result in like-for-like retaliation. (theecologist.org)
  • The two reactors had been shut down at the time the magnitude 9 earthquake struck a week ago, but spent fuel rods in an upper level of the reactor buildings were still generating heat and required cooling. (latimes.com)
  • Nuclear reactors, where the actual fission process takes place and creates heat, are strongly reinforced to withstand impact. (popsci.com)
  • Either nation might choose to shut down its reactors in order to minimise risks. (theecologist.org)
  • No specific regulatory occupational exposure limit (OEL) for nanographene platelets exists, but improved containment is recommended to lower potential risks associated with these nanomaterials. (cdc.gov)
  • Because cooling the core is such a big deal, the reactor has a number of cooling systems, each in multiple versions (the reactor water cleanup system, the decay heat removal, the reactor core isolating cooling, the standby liquid cooling system, and the emergency core cooling system). (nextbigfuture.com)
  • The flooded generators failed, cutting power to the critical pumps that must continuously circulate coolant water through the reactor core. (wikipedia.org)
  • Most attention, though, has been focused on Dai-ichi units 1 and 3, where operators have been funneling in sea water in a last-ditch measure to cool the reactors. (mbtmag.com)
  • Let's start at the heart of a boiling water reactor where the nuclear fuel dwells. (ieee.org)
  • Responders have also been struggling to maintain the water level in its reactor, and as of Thursday evening it was only half full. (motherjones.com)
  • The wetwell is connected to the dry containment by a system of vents, which discharge under the suppression pool water in the event of high pressure in the dry containment. (world-nuclear.org)
  • During normal operation, the dry containment atmosphere and the wetwell atmosphere are filled with inert nitrogen, and the wetwell water is at ambient temperature. (world-nuclear.org)
  • There are also two powerful jet-pump recirculation systems forcing water down around the reactor core and shroud. (world-nuclear.org)
  • Initial containment at Fukushima involved pumping sea water onto the burning reactor in huge quantities according to Michio Kaku. (uchicago.edu)
  • Recently, the NRC staff in SECY--18--0060[6] proposed the development of a performance-based, technology--inclusive regulation as an alternative approach for the licensing of non--light--water reactors. (ans.org)
  • Engineers have been focusing their efforts on reactors No. 2 and 3 and the building housing reactor No. 4, which also houses a damaged spent fuel pool, but the need to build shelters to protect workers and equipment from the water that was being sprayed, as well as the radiation, delayed efforts. (latimes.com)
  • The pool at reactor No. 4 has the hottest spent fuel and is thought to have either holes in the walls of the pool or some other type of leak that is allowing water to run out. (latimes.com)
  • It was in January when the crew of the plant first noticed that water was leaking through to the drain on the first level of the building housing the reactor. (rt.com)
  • Blast and white smoke come from Fukushima Dai-1 , reactor No.1--blowing off the roof and the upper part of the outer walls of the structure containing the reactor. (ieee.org)
  • The walls blew out on the visible and opposite side of the containment building. (pravda.ru)
  • I just hope they can get enough generators there to run the pumps to keep the other reactors cool enough to prevent more disasters. (berkeley.edu)
  • At 0346 MST, in accordance with station procedures, both trains of Containment Spray, LPSI, and HPSI pumps were overridden and stopped, rendering Containment Spray inoperable as well. (nrc.gov)
  • Experts do not believe the cooling pumps at reactors No. 4, 5 and 6 had been damaged, and the success in restoring power at No. 5 and 6 suggests that assessment was correct. (latimes.com)
  • Starting in 1977, Soviet scientists installed four RBMK nuclear reactors at the power plant, which is located just south of what is now Ukraine's border with Belarus. (nationalgeographic.com)
  • Ukraine's 15 power reactors across at four sites generate 51.2 percent of the country's electricity. (theecologist.org)
  • An increasing number of critics during the 1960s charged that the AEC's regulations were insufficiently rigorous in several important areas, including radiation protection standards, reactor safety, determining plant sites, and environmental protection. (tmia.com)
  • When the diesel generators were gone, the reactor operators switched to emergency battery power. (nextbigfuture.com)
  • Although power has so far been restored only at reactor buildings 5 and 6, which were not considered a particular threat, that success suggests that workers are finally beginning to make some headway in their effort to prevent more radiation from escaping the plant. (latimes.com)
  • Engineers said they hoped to have the power connected to the remaining reactor buildings sometime Sunday or early Monday. (latimes.com)
  • The priority now is to maintain integrity of the first containment (keep temperature of the fuel rods below 2200°C), as well as the second containment, the pressure cooker. (nextbigfuture.com)
  • Later Monday, fuel rods at a separate reactor in the plant were fully exposed after it lost its ability to cool down, officials said. (mbtmag.com)
  • These images are all that most people will ever see of the SM-1 nuclear reactor that's sat on Fort Belvoir, unused since 1973, when the Army shut it down and removed its fuel rods and waste. (washingtonian.com)
  • And another hazard lurks at plants: Spent fuel rods reside in cooling pools after they're done with their work in the reactor, but before they go into more permanent storage. (popsci.com)
  • Comparative studies of different storage concepts have been conducted on the basis of safety (mainly containment barriers and cooling), economic, modular design and operating flexibility criteria. (osti.gov)
  • The Westinghouse AP300™ Small Modular Reactor is the most advanced, proven and readily deployable SMR solution. (westinghousenuclear.com)
  • The Westinghouse AP300 SMR delivers on the promises of small modular reactors: smaller scale, modular construction for efficient build schedules, state-of-the-art safety and reliability. (westinghousenuclear.com)
  • Simplified, modular, ultra compact nuclear island (costliest portion of any reactor) reduces construction costs/schedule. (westinghousenuclear.com)
  • For many reasons, a large alliance of public interest groups oppose the use of weapons-plutonium as MOX fuel, not the least of which is reactor safety concerns. (nirs.org)
  • Containment efforts and monitoring continue and cleanup is expected to last until at least 2065. (nationalgeographic.com)
  • Firsthand look: U.S. nuclear expert Lake Barrett (right) inspects the reactor 4 building of the Fukushima No. 1 nuclear complex on Wednesday, in preparation of the removal of fuel from the unit's spent fuel pool. (japantimes.co.jp)
  • France has a wide variety of experimental spent fuels different from LWR spent fuel discharged from commercial reactors. (osti.gov)
  • misc{etde_10116263, title = {The cascad spent fuel dry storage facility} author = {Guay, P, and Bonnet, C} abstractNote = {France has a wide variety of experimental spent fuels different from LWR spent fuel discharged from commercial reactors. (osti.gov)
  • It seems highly unlikely that either nation - or any sub-national groups - would deliberately target nuclear reactors or spent fuel stores in the current conflict. (theecologist.org)
  • Spent fuel cooling ponds and dry stores often contain more radioactivity than the reactors themselves, but without the multiple engineered layers of containment that reactors typically have. (theecologist.org)
  • The Unit 4 building has been severely damaged, and the spent fuel pools don't have the containment infrastructure that the reactors do. (motherjones.com)
  • Les Accidents en milieu éducatif : propositions de prévention / ouvrage collectif réalisé sous la direction de Solange Garnier, Denis Parisot. (who.int)
  • A "tiny" amount of radiation had leaked earlier in the day when officials attempted to relieve pressure inside the reactor. (csmonitor.com)
  • Over the past 24 hours, however, government officials have expanded evacuations around the reactors, and conditions seemed to seesaw wildly at the Fukushima I complex, where the No. 1 and No. 2 reactors lost their backup cooling systems powered by diesel generators within an hour after the quake. (csmonitor.com)
  • Officials decide to vent the reactor to lower pressure. (ieee.org)
  • Officials have declared states of emergency at six Fukushima reactors, where Friday's twin disasters knocked out the main cooling systems and backup generators. (mbtmag.com)
  • Bell Bend - PPL is seeking approval to build and operate an Evolutionary Power Reactor approximately seven miles northeast of Berwick, Pa. (tmia.com)
  • The results of a modern process to design, license, and operate a reactor or enable the use of consensus standards in support of licensing would be characterized by such attributes. (ans.org)
  • #SUNPP 's reactors continue to operate normally, no staff were injured & lines connecting SUNPP to the grid were unaffected. (popsci.com)
  • The last line of defense is putting everything into the third containment (see above), that will keep everything, whatever the mess, control rods in our out, core molten or not, inside the reactor. (nextbigfuture.com)
  • Because at the end of the day, if cooling cannot be restored, the core will eventually melt (after hours or days), and the last line of defense, the core catcher and third containment, would come into play. (nextbigfuture.com)
  • But the goal at this stage was to manage the core while it was heating up, and ensure that the first containment (the Zircaloy tubes that contains the nuclear fuel), as well as the second containment (our pressure cooker) remain intact and operational for as long as possible, to give the engineers time to fix the cooling systems. (nextbigfuture.com)
  • Efforts at containment obviously failed to stop the reactor core from blowing up. (pravda.ru)
  • This event is being reported as a reactor protection system and a specified system actuation in accordance with the reporting criteria of 10 CFR 50.72(b)(2)(iv)(B) and 10 CFR 50.72(b)(3)(iv)(A). 'Following the reactor trip, all [Control Element Assemblies] CEAs inserted fully into the core. (nrc.gov)
  • During normal operation they all had a core outlet temperature of 286°C under a pressure of 6930 kPa and with 115-130 kPa pressure in dry containment. (world-nuclear.org)
  • Given the potentially dire results should microbes escape one of these containment facilities, researchers at a major US university sought to probe whether negative pressure systems could be hacked. (thebulletin.org)
  • Evacuated workers reported violent shaking and burst pipes within the reactor building. (wikipedia.org)
  • If a LOCA occurs, steam flows from the dry containment (drywell) through a set of vent lines and pipes into the suppression pool, where the steam is condensed. (world-nuclear.org)
  • There's no protection," says Kenneth Bergeron, a physicist who previously worked on nuclear reactor accident simulations at the Department of Energy's Sandia National Laboratories. (motherjones.com)
  • A pressure build-up was soon reported in reactor No. 1, and coolant loss and spiking temperatures were reported in No. 2. (csmonitor.com)
  • The Reactor Protection System actuated to trip the reactor on High Pressurizer Pressure, although no plant protection setpoints were exceeded. (nrc.gov)
  • The Unit 2 reactor tripped because of actual High Pressurizer Pressure that occurred as a result of a Main Steam Isolation Signal actuation. (nrc.gov)
  • The earthquake destroyed the external power supply of the nuclear reactor. (nextbigfuture.com)
  • Scientists at a press conference for anti-nuclear power groups say the Japanese nuclear reactor crisis could get worse before it gets better. (csmonitor.com)
  • Their comments, which came during a Saturday conference call convened by anti-nuclear power groups, were in sharp contrast with reports by the Japanese government which appeared to indicate the main crisis in one of its nuclear reactors was past, although a state of emergency remained in effect for five reactors. (csmonitor.com)
  • On Saturday, the Japanese government reported five reactors at two different nuclear power plants - Fukushima I and Fukushima II - to be in a state of emergency following the massive earthquake that hit Japan Friday. (csmonitor.com)
  • Tokyo Electric Power Co. , which operates the plants, reported that an equipment failure had made it "impossible to cool two reactors" at the Fukushima I plant. (csmonitor.com)
  • On December 22, 2008, the Nuclear Regulatory Commission accepted the PPL Bell Bend LLC, Combined License Application ("COL" or "COLA") for an Evolutionary Power Reactor ("EPR") at the Bell Bend Nuclear Power Plant Docket No. 52-039. (tmia.com)
  • On April 25 and 26, 1986, the worst nuclear accident in history unfolded in what is now northern Ukraine as a reactor at a nuclear power plant exploded and burned. (nationalgeographic.com)
  • On April 25, 1986, routine maintenance was scheduled at V.I. Lenin Nuclear Power Station's fourth reactor, and workers planned to use the downtime to test whether the reactor could still be cooled if the plant lost power. (nationalgeographic.com)
  • Despite attempts to shut down the reactor entirely, another power surge caused a chain reaction of explosions inside. (nationalgeographic.com)
  • Even if catastrophe was averted, the wisdom of operating nuclear power reactors would be reconsidered in the aftermath of war. (theecologist.org)
  • Reactor power was 460 MWe for unit 1, 784 MWe for units 2-5, and 1100 MWe for unit 6. (world-nuclear.org)
  • Michio Kaku, a string theory physicist, gave his evaluation of the current state of containment at the Fukushima nuclear power plant in Japan. (uchicago.edu)
  • While the 2 megawatts of power it generated aren't much by the standards of today-Dominion's Possum Point power plant 12 miles down the Potomac generates more than 800 times as much electricity from gas and oil-it was the first nuclear reactor in the United States ever connected to the commercial power grid. (washingtonian.com)
  • Around the same time, the Army also developed mobile reactors, some that could be put on a flatbed and put on a standard Air Force cargo plane, and a ship, the Sturgis (MH-1A), a former Liberty Ship that was stripped of its propellers and turned into a towable nuclear power plant. (washingtonian.com)
  • The strike on Monday took place not far from the South Ukraine Nuclear Power Plant and its three reactors, but they remain operationally normal, according to the IAEA. (popsci.com)
  • However, nuclear plants need a supply of electricity, even when those reactors are shut down, to power its systems-here's more on how they work . (popsci.com)
  • Since Price-Anderson links all U.S. nuclear power reactors to take (limited) liability for an accident at any one site, the assumption is that the operation of each of these reactors contributes a comparable level of risk to the overall chances of an accident occurring. (nirs.org)
  • Nowhere in the world has weapons-grade plutonium been used to power a commercial reactor, let alone plutonium extracted from a nuclear warhead. (nirs.org)
  • Opened in 1977, the Crystal River reactor could have had its life extended, just like the ones in North and South Carolina and others around the country. (tampabay.com)
  • Plutonium also delivers more hard, fast neutrons, which age and fatigue reactor components more than conventional fuels. (nirs.org)
  • Magnetic fields confine a superheated plasma of fusible material, and nuclear fusion reactions occur inside this Tokamak-style reactor . (scienceblogs.com)
  • Barakah was chosen as the site to build four APR-1400 nuclear reactors successively, with the first scheduled to start supplying electricity in 2017. (wikipedia.org)
  • Russia's 38 reactors supply 20.6 percent of the country's electricity. (theecologist.org)
  • I hope the reactors scrammed fully and the the shaking wasn't so much as to prevent the control rods falling fully. (berkeley.edu)
  • The function of the primary containment system is to contain the energy released during any loss of coolant accident (LOCA) of any size reactor coolant pipe, and to protect the reactor from external assaults. (world-nuclear.org)
  • Main Steam Isolation Signal (MSIS), Safety Injection Actuation Signal (SIAS), and Containment Isolation Actuation Signal (CIAS) were received. (nrc.gov)
  • When the reactor is shut down, the steam in the main circuit is diverted via a bypass line directly to the condensers, and the heat is dumped there, to the sea. (world-nuclear.org)
  • Researchers hacked a lab's pathogen containment system. (thebulletin.org)
  • reactor safety (accident progression analysis, behaviour and qualification of the containment system, accident management and control). (europa.eu)
  • At 0315 MST on May 19, 2021, Unit 2 reactor automatically tripped during testing of the Plant Protection System. (nrc.gov)
  • The vapor container entrance to the SM-1 reactor system. (washingtonian.com)
  • The country's nuclear future relies largely on the 98 remaining reactors, including four in South Florida. (tampabay.com)
  • The situation at the Japanese plant is constantly changing and involves several reactors in various states of disrepair. (motherjones.com)
  • Six more are under construction in China and one AP1000 reactor is operating at Plant Vogtle in Georgia while a second nears completion. (westinghousenuclear.com)