Sentences with phrase «water reactors in»

This has Candu reactors, pressurized heavy water reactors, which are very different from the light water reactors in Finland.

Such equipment is required on pressurised - water reactors in the West.

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.

This was the reaction of Len Green, a spokesman for Nuclear Electric, to accusations that the company's nearly completed Sizewell B pressurised water reactor in Suffolk has a flaw that increases the likelihood of a meltdown.

M.I.T. nuclear engineer Charles Forsberg, another co-chair of the report, noted that a typical light - water reactor in the U.S. needs 200 metric tons of mined uranium resulting in 20 metric tons of uranium fuel per year.

Boiling - water reactor (BWR): A light - water reactor in which water, used as both coolant and moderator, is allowed to boil in the core.

Not exact matches

However, when asked to comment, one CEO said Canada is in a strong position because Candu reactors use heavy water instead of boiled or pressurized water, which allows the reactor to run on natural uranium instead of enriched uranium fuel.

The Government of Canada could build on this momentum to develop an expanded MoU on civilian nuclear technology co-operation that includes research in pressurized heavy water reactor technology, nuclear medicine and other areas discussed by the prime ministers.

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.»

«The Australian water and wastewater industry has been dominated by low pressure in - channel UV systems, but increasingly designers and end - users are starting to appreciate the benefits of closed reactor medium pressure systems.

While GWE's anaerobic waste water technology has been proved worldwide at more than 300 installations of totally enclosed tanks, or reactors, this is the first time it has been applied to a covered lagoon, an application where it has enormous further potential in countries with strong agribusiness sectors.

Baffle bolts hold in place baffle plates, which channel cooling water to the reactor core.

Fire protection piping at Indian Point's Unit 2 reactor broke and leaked and though it resulted in a loss of water pressure to the fire suppression system, inspectors from the Nuclear Regulatory Commission determined it was of «very low safety significance,» according to the N.R.C. report.

Officials at the FitzPatrick Nuclear Power Plant near Oswego are investigating why fuel rods in the reactor's core are leaking radiation and while not considered an emergency, it could potentially spread contaminated water to other parts of the plant.

It was not in danger of ever reaching a drinking water source, according to Jim Noggle, branch chief in the agency's region I division of reactor safety.

Water with a little bit of tritium in it is often released from nuclear reactors, notes Gizmodo, and tritium in general (which emits a relatively weak form of radiation) is not dangerous unless it's ingested.

Each day, some two billion gallons of water are pumped from Long Island Sound into the Millstone Power Station in Waterford, Conn. — that state's only nuclear power plant — and used to help cool systems and support the station's two operating reactors.

In fact, throughout the first week of the Fukushima crisis, emergency workers tried to figure out a way to open up a larger hole in the Unit 2 reactor building, which had not suffered an explosion, to allow better access to inject cooling water without creating the kind of spark that might cause another hydrogen blasIn fact, throughout the first week of the Fukushima crisis, emergency workers tried to figure out a way to open up a larger hole in the Unit 2 reactor building, which had not suffered an explosion, to allow better access to inject cooling water without creating the kind of spark that might cause another hydrogen blasin the Unit 2 reactor building, which had not suffered an explosion, to allow better access to inject cooling water without creating the kind of spark that might cause another hydrogen blast.

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.

In the event of a breakdown of pumps that supply the reactor with fresh cooling water, the torus design is supposed to provide additional cooling.

Another issue for critics is whether the water delivered from the elevated reservoir in an emergency would continue to cool the reactor if there were a sustained loss of power for emergency pumps.

But because of the location of such pools in older boiling - water reactor designs — specifically, in the upper levels of the reactor building — any water added would ultimately drain down through the building, inundating the emergency pumps in the basement.

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 right.

In superheating, water is heated well beyond its boiling point — in this case from 1,000 to 1,300 degrees Celsius — producing high - temperature steam to run turbines and also to operate solar reactors to split the water into hydrogen and oxygeIn superheating, water is heated well beyond its boiling point — in this case from 1,000 to 1,300 degrees Celsius — producing high - temperature steam to run turbines and also to operate solar reactors to split the water into hydrogen and oxygein this case from 1,000 to 1,300 degrees Celsius — producing high - temperature steam to run turbines and also to operate solar reactors to split the water into hydrogen and oxygen.

The NRC investigators reported: • The plant had a single diesel - driven pump to provide emergency cooling water to a single reactor in case an earthquake cut off normal water flow.

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

The rest of this special News & Analysis section examines what we have learned about radiation risks from previous exposures (p. 1504), improvements in safety since the boiling water designs at Fukushima (p. 1506), what to do with the wrecked reactors (p. 1507), and damage to research facilities from the earthquake (p. 1509).

Bracing for coincidental failures Inspection reports disclosed that on one reactor, some door seals that were not hardened to withstand seismic shocks could fail in an earthquake, allowing water to enter rooms containing electrical equipment used to shut down the plant.

«You have a hell of a lot more water in the reactor relative to the size of the breaks that can happen,» Mowry explains.

«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.

So B&W has designed an integral pressurized - water reactor that it can manufacture in a factory and ship to a site.

Led by graduate student Sandra Rincon and her advisor, Haluk Beyenal, professor in the Gene and Linda Voiland School of Chemical Engineering and Bioengineering, the researchers developed a unique biofilm reactor that recycles gasses and uses less water and lower light than typical reactors.

Pressure in the suppression pool — a doughnut - shaped water vessel below the reactor — dropped after the explosion, indicating that the containment vessel had been compromised.

The reactor is now shut down while technicians examine the source of the tritium leak, which has spread in a plume in ground water underneath the lab grounds.

Water can not be employed in a fast reactor to carry the heat from the core — it would slow the fast neutrons.

In an article published today in the Proceedings of the National Academy of Sciences titled «Solar photothermochemical alkane reverse combustion,» the researchers demonstrate that the one - step conversion of carbon dioxide and water into liquid hydrocarbons and oxygen can be achieved in a photothermochemical flow reactor operating at 180 to 200 C and pressures up to 6 atmosphereIn an article published today in the Proceedings of the National Academy of Sciences titled «Solar photothermochemical alkane reverse combustion,» the researchers demonstrate that the one - step conversion of carbon dioxide and water into liquid hydrocarbons and oxygen can be achieved in a photothermochemical flow reactor operating at 180 to 200 C and pressures up to 6 atmospherein the Proceedings of the National Academy of Sciences titled «Solar photothermochemical alkane reverse combustion,» the researchers demonstrate that the one - step conversion of carbon dioxide and water into liquid hydrocarbons and oxygen can be achieved in a photothermochemical flow reactor operating at 180 to 200 C and pressures up to 6 atmospherein a photothermochemical flow reactor operating at 180 to 200 C and pressures up to 6 atmospheres.

«We are the first to use both light and heat to synthesize liquid hydrocarbons in a single stage reactor from carbon dioxide and water,» said Brian Dennis, UTA professor of mechanical and aerospace engineering and co-principal investigator of the project.

This signaling pathway could be used to optimize the photosynthetic efficiency of plants subject to water and nutrient deficiencies, with potential applications in agriculture and reactor - based crop development for green chemistry and algae - based biofuel solutions.

On Earth, this radiation shows up in the reactor pools of certain types of nuclear power plants, sparked by high - speed atomic fragments that go shooting through the water.

«Doomsday» scenarios But the resulting radiation could be so high, «it would be almost impossible to get anyone in there,» to continue supplying water to the damaged reactors, he said.

Reactor Unit 2 On 14 March, engineers decided that the water level in the reactor was so low that it, too, needed sea water and boron injected into it.

Water heated by the core ascends in a chimneylike metal structure inside the reactor, then spills over the top of the chimney and sinks back down along the inside walls of the reactor to repeat the journey.

«The Fukushima accident could have been a hundred times worse had there been a loss of the water covering the spent fuel in pools associated with each reactor,» von Hippel said.

In addition to its unique fuel cycle, the TerraPower design employs a high - temperature, liquid metal core cooling technology suited to a breeder reactor with «fast» neutron activity, rather than today's predominant reactors whose water cooling systems slow neutrons.

Jaczko, chairman of the Nuclear Regulatory Commission, said his staff in Tokyo had been told by Japanese utility officials that cooling water that normally covers spent fuel was nearly or totally gone from an uncovered concrete pool above reactor Unit 4.

The report's conclusions, released in a preview last year, are that light water reactors, the mainstay of the U.S. fleet, will remain the «preferred option» for U.S. nuclear plants for decades.

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.

Across the East China Sea, west of Japan and its ongoing crisis, sits the growing Qinshan nuclear power plant, where four new pressurized - water reactors are under construction in addition to the five already operating on - site.