Sentences with phrase «water reactors as»

Earlier this week GE Hitachi Nuclear Energy announced that the company intended to offer refuelling services to pressurized water reactors as well as for BWRs.

Babcock & Wilcox — one - time builder of large pressurized water reactors as well as smaller ones suitable for the submarines of the U.S. Navy — would like to shrink those down to just 180 megawatts.

Not exact matches

This reactor, a 5 MW light - water research reactor known as the Pakistan Atomic Research Reactor (PARR - 1), began operating in 1965 at Pinstech in Nilore.»

That material attracts water - soluble metal precursors, which use the space within the polymer hairs as nano - reactors to form gold nanoparticles.

Much as what unfolded during the crisis in Japan, the computer modeling suggested that fuel in one of the two reactors on the Peach Bottom site would begin to melt as soon as nine hours after a loss of cooling water flow.

Regardless of the ability of the vents to function appropriately, one clear difference exists between the operation of such boiling - water reactors in the U.S. versus those in Japan — in the U.S., reactor operators have the authority to vent radioactive steam or hydrogen gas as conditions warrant.

The explosions tore open reactor buildings, damaging the 12 - meter - deep pools where used nuclear fuel is kept cool, potentially setting off another meltdown in the fuel there as the surrounding water drained away or boiled off.

As NRC staff noted during the Fukushima emergency, when there was concern that the spent - fuel pool at Unit 4 may have lost its cooling water as well as been damaged by the reactor building explosion, adding cold water to already hot fuel can create a problem in its own righAs NRC staff noted during the Fukushima emergency, when there was concern that the spent - fuel pool at Unit 4 may have lost its cooling water as well as been damaged by the reactor building explosion, adding cold water to already hot fuel can create a problem in its own righas well as been damaged by the reactor building explosion, adding cold water to already hot fuel can create a problem in its own righas been damaged by the reactor building explosion, adding cold water to already hot fuel can create a problem in its own right.

There are some 50 modular designs being developed globally, and while many are traditional light water reactors, which use water to cool the reactor core, others gain efficiency by using coolants such as gas, which allow reactors to reach higher temperatures.

External tanks hold enough additional water to cool the reactor for two weeks in the event of a loss of power as well.

«The staff has contended pretty much all along that they will have to meet the same security requirements as all of the large reactors,» says Michael Mayfield, director of the Division of Advanced Reactors and Rulemaking in the NRC's Office of New Reactors, noting that a timeline for licenses could be expedited if such reactors are simply scaled down versions of existing light water reactors that do not require new regureactors,» says Michael Mayfield, director of the Division of Advanced Reactors and Rulemaking in the NRC's Office of New Reactors, noting that a timeline for licenses could be expedited if such reactors are simply scaled down versions of existing light water reactors that do not require new reguReactors and Rulemaking in the NRC's Office of New Reactors, noting that a timeline for licenses could be expedited if such reactors are simply scaled down versions of existing light water reactors that do not require new reguReactors, noting that a timeline for licenses could be expedited if such reactors are simply scaled down versions of existing light water reactors that do not require new regureactors are simply scaled down versions of existing light water reactors that do not require new regureactors that do not require new regulations.

But such reactors still require the same electricity - generating, safety, and waste disposal systems as the hulking light - water reactors presently being built as well as identical rigorous licensing requirements, at least in the U.S. — and that may cost them.

The 29 - year - old boiling water reactor's future is grim as the Illinois Legislature missed the deadline yesterday to pass new energy rules and rates that would extend Clinton a lifeline.

Water is being deliberately circulated through each reactor every day to cool the fuel within — but the plant lies on a slope, and water from precipitation keeps flowing into the buildings as Water is being deliberately circulated through each reactor every day to cool the fuel within — but the plant lies on a slope, and water from precipitation keeps flowing into the buildings as water from precipitation keeps flowing into the buildings as well.

«Streams and rivers are not only passive conduits of water and terrestrial carbon dioxide, but also function as reactors that generate and release carbon dioxide during transport downstream,» said Erin Hotchkiss.

As of 10 P.M. local time on Thursday, the JAIF listed the following status of the six Fukushima Daiichi reactors: • Buildings around reactor Nos. 1, 3 and 4 were «severely damaged»; the building housing reactor No. 2 was «slightly damaged»; • Cooling was not working for reactor Nos. 1, or 3; • Water levels were covering more than half of the fuel in reactor No. 2; reactor Nos. 1 and 3 water levels were covering only about half of the Water levels were covering more than half of the fuel in reactor No. 2; reactor Nos. 1 and 3 water levels were covering only about half of the water levels were covering only about half of the fuel.

As of midday Thursday, the country's Nuclear and Industrial Safety Agency spokesperson Yoshitaka Nagayama, noted that «because we have been unable to go to the scene, we can not confirm whether there is water left or not in the spent fuel pool at reactor No. 4,» The New York Times reported.

Novel designs with alternative cooling fluids other than water, such as Transatomic Power's molten salt — cooled reactor or the liquid lead — bismuth design from Hyperion Power, are in development.

These reactors could face extraordinary challenges, such as the recent twin blows of a magnitude 9.0 earthquake, which knocked out connections to the local power grid, followed by a wall of water that destroyed the fuel tanks for backup diesel generators and flooded critical electrical equipment, crippling the boiling - water reactors at Fukushima Daiichi in Japan.

That hydrogen buildup was the result of hot steam coming into contact with overheated nuclear fuel rods covered by a cladding of zirconium alloy, or «zircaloy» — the material used as fuel - rod cladding in all water - cooled nuclear reactors, which constitute more than 90 percent of the world's power reactors.

Flaws in the boiling - water reactor safety system at Fukushima Daiichi (as well as Oyster Creek and Vermont Yankee) had been known since 1972.

As the recent meltdown in Fukushima showed, the design of these reactors» systems, such as the donut - shaped «suppression pool» of water meant to cool the reactor in a crisis, showed flaws — flaws identified by regulators decades agAs the recent meltdown in Fukushima showed, the design of these reactors» systems, such as the donut - shaped «suppression pool» of water meant to cool the reactor in a crisis, showed flaws — flaws identified by regulators decades agas the donut - shaped «suppression pool» of water meant to cool the reactor in a crisis, showed flaws — flaws identified by regulators decades ago.

As well, Diablo Canyon's on - site desalination plant, which provides fresh water to cool the reactors themselves, has two reserve pools of 2.5 million gallons each, which are above the reactors and could be tapped if the plant goes down.

Therefore, either reprocessing or recycling spent nuclear fuel, as the French and Japanese do, is likely to be a waste of money better spent on improving the light - water reactors presently in use.

But those reactors» spent fuel pools are benefiting from a diesel generator that is still working to keep cooling water in place, according to World Nuclear News, though temperatures are beginning to rise in these pools as well.

«Many applications, such as power plant reactors, require the management and control of the movement of water droplets at very high temperatures,» says Wang, an associate professor of mechanical and biomedical engineering at City University.

Hydrogen can also be split from water in high - temperature nuclear reactors or generated from fossil fuels such as coal or natural gas, with the resulting carbon dioxide captured and sequestered rather than released into the atmosphere.

In this agreement, both states committed to dispose of at least 34 metric tons of excess weapons grade plutonium, primarily as MOX fuel for light water reactors (LWR).

Light water - cooled graphite - moderated reactors Fuelled by low - enriched uranium oxide, these reactors use graphite as a moderator and water to cool the core.

Most reactors of this type are known as pressurised heavy water reactors, favoured especially in Canada.

Enriched uranium oxide is formed into rods and water is used both as a coolant, flowing through the reactor core to transfer heat away, and as a moderator, slowing down neutrons released by fission so that they promote further nuclear reactions.

For instance, to view reactors of similar type and vintage to those at Fukushima Daiichi, Japan, choose «boiling water» as the type and use the slider to select those that began construction in the 1960s and 1970s.

The barrage «would last 120 years, or four times as long as a pressurised water reactor».

The CAREM design was developed by Invap under contract with the CNEA as a simplified modular pressurised water reactor (PWR) with integral steam generators.

All of the remaining reactors, however, will remain offline until they have been upgraded to meet extended safety requirements, such such as the provision of alternative power supplies, multiple sources of cooling water, back - up control rooms and venting to prevent hydrogen escape.

The water around the reactor core serves as three things: a neutron moderator, meaning it slows down the fast neutrons released during fission, which then sustain the chain reaction; a cooling agent; and a radiation shield.

In order to become commercially viable, FBRs must become at least as economic as light water reactors.

Results: Important pressurized water nuclear reactor components are being made from a nickel - base alloy that contains twice the amount of chromium as the material previously used.

RIAR's reactors provide a full range of capabilities to test fuel and materials of all types of existing power reactors as well as advanced and innovative ones: water - cooled thermal reactors, including those with boiling and pressurized water, gas - cooled, fast and other types of reactors.

Researchers filled the aluminium reactor with sea water taken from Whitby Bay, and waste aluminium such as that found in kitchen foil or food wrappings.

This is why normal water is used as a coolant in most thermal neutron reactors.

Unlike the current generation of light - water nuclear reactors, PRISM uses metallic fuel, such as an alloy of zirconium, uranium, and plutonium, and PRISM's fuel rods sit in a bath of a liquid metal — sodium — at atmospheric pressure, which ensures that the transfer of heat from the metal fuel to the liquid sodium coolant is extremely efficient.

SMR - 160 is a conventional fission reactor, using water as the cooling medium, and is designed with six decades of world - wide industrial operating experience with pressurized water reactors.

He leads the Fuel Material and Chemistry Focus Area of the Consortium for Advanced Simulation of Light Water Reactors, a DOE Energy Innovation Hub, as well as Scientific Discovery through Advanced Computing (SciDAC) projects on plasma surface interactions and fission gas behavior in nuclear fuel.

GE realised during the Clinch River Breeder Reactor project that trying to develop a sodium reactor along the same scale as a water reactor would not be optimal.

«GEH has broad engineering experience, deep technical capability and significant investment in its sodium fast reactor technology program that builds on a 60 - year history as an original equipment manufacturer of more than 60 boiling water reactors worldwide,» said Jay Wileman, President and CEO, GEH.

Both aSMR designs share fundamental features, such as high energy neutrons, liquid sodium cooling and metallic fuel, which provide inherent safety performance and more economically competitive plant architecture compared to traditional water - cooled reactors.

«GEH has broad engineering experience, deep technical capability and significant investment in its sodium fast reactor technology program that builds on a 60 - year history as an original equipment manufacturer of more than 60 boiling water reactors worldwide,» said the company's president and CEO Jay Wileman.

Modern light - water reactors can employ convective cooling to eliminate the need for external cooling in the event of an anomaly such as an earthquake.

The Heroes Of Telemark — Decent enough WW2 action film set in Norway as the Allies try to blow up some Nazi reactors to prevent them from developing heavy water (necessary for an atomic bomb).