Sentences with phrase «of reactor vessels»

Long term waste disposal seems a major sticking point for a lot of people, leaving aside short term, insane choices such as storing spent fuel high in the air on top of reactor vessels so as to save plumbing and thus money.

The sodium then flows downward through one of the two intermediate heat exchangers (IHX) which is attached to, and suspended from, the top of the reactor vessel.

Four electromagnetic (EM) pumps are suspended from the top of the reactor vessel and have no moving parts — the liquid metal sodium is propelled by the use of magnets in the pump.

The liquid sodium level is maintained about 4 feet from the top of the reactor vessel.

PRISM puts the used fuel from the core into the upper portion of the reactor vessel.

Not exact matches

The faulty bolts were discovered during an in - depth inspection of the Indian Point nuclear reactor vessel scheduled for once every decade.

The resulting organic soup flows into a flash vessel where pressure drops dramatically, liberating some of the water, which returns back upstream to preheat the flow into the first - stage reactor.

TEPCO modeling and analyses suggest that most, if not all, of the fuel in the Unit 1 reactor melted, burned through the reactor pressure vessel, dropped to the bottom of the containment vessel, and perhaps ate into the concrete base.

Modular reactors house all the components in one vessel, reducing the risk of accident.

Conventional plants have a number of systems to prevent the core from being uncovered, but modular reactors sidestep the problem entirely by housing all the system components, including the steam generators, inside a single vessel.

If fuel rods remain uncovered, they may begin to melt, and hot, radioactive fuel can pool at the bottom of the vessel containing the reactor.

That hydrogen can then be released from the reactor core and containment vessel and, if it accumulates in sufficient quantities — concentrations of 4 percent or more in the air — it can explode, as has apparently occurred at reactors No. 1 and 3, and possibly No. 2 as well.

It needs to be: seven of these loops will be stacked on top of each other to form one of the many magnets that will confine and direct hydrogen plasma at up to 100 million °C in the reactor vessel.

Two snakelike robots crawled through a pipe leading into the 48 - meter - tall primary containment vessel in the Unit 1 reactor to ascertain the state of melted fuel masses.

The explosion may have damaged the reactor pressure vessel, perhaps holing it, leading to a partial meltdown and leak of the fuel inside.

Another issue Motojima has had to grapple with is whether or not to add another set of magnetic coils to the interior walls of the reactor to help control disturbances in the plasma called edge - localized modes (ELMs) that can damage the inside of the plasma vessel.

After all, the first reactor built at Qinshan back in 1990 — the first reactor ever designed and constructed entirely by the Chinese — had to be torn down and rebuilt because of faults in the foundation as well as defects in the welding of the steel vessel that contained the reactor itself.

It describes chaos and conflict between top officials of TEPCO and the emergency staff formed by then - prime minister Naoto Kan in the most critical phase of the crisis, while workers were battling to control a buildup of explosive hydrogen inside three reactor vessels whose fuel cores had become exposed.

As a result, the Nuclear Installations Inspectorate also asked the company to assess the integrity of the pressure vessels in the other four Magnox plants, even though Trawsfynydd's vessels receive higher neutron doses than the other reactors because of differences in design.

«The reactor vessel head could have failed between two and 14 months further out, that would have been a major loss - of - coolant accident,» says NRC spokesman Scott Burnell.

The second generation of Magnox reactors, installed at Oldbury and Wylfa, use concrete pressure vessels, as do the advanced gas - cooled reactors that followed them.

He observed that there are ways to extend the lives of existing reactors, but upgrades get progressively more expensive, and certain components, like reactor pressure vessels, can not be replaced, so renewed operating licenses are only prolonging the inevitable.

The fact that some of the isotopes are short - lived indicates that at least some of the radiation must have originated from breaches in the reactor vessels and not from the plant's overheated caches of spent fuel, he says.

Major features of SMR - 160 include its small footprint (4.5 acres), minuscule site boundary dose, large inventory of coolant in the reactor vessel and its modularity — allowing project owners the freedom to effectively build the number of units to meet current and future demand.

The NuScale Power Module design is comprised of an integrated reactor vessel, steam generator, and containment vessel in a single cylindrical module.

Although Fukushima included explosive events attributed to the escape and ignition of hydrogen gas, the main reactor vessels were not breached to the extent that occurred in Chernobyl.

The slow up - flow of water in the reactor vessel insures that little radioactive crud produced from long term operation carries to the above - ground portion of the reactor coolant system.

The diagram also shows seismic shock - absorbers that protects the reactor vessel in the event of an earthquake.

The reactor vessel is subject to cumulative neutron fluence in 120 years of operation that is less than that has been experienced by presently operating reactors.

Considering the condensing ability of the steam generators, water inventory in the HA - 2 tanks was chosen so that coolant inventory essential for reliable cooling of fuel can be maintained in the reactor vessel for 24 - 280 hours (depending on leak size).

The vacuum also enhanced steam condensation rates on the inside surface of the submerged containment in the case where steam is vented from the reactor vessel, which in turn provides for very effective heat removal from the primary system.

More than 90 % of this unit's profit comes from critical nuclear components such as: core barrels, reactor vessels, closure heads, steam generators, and pressurizers.

is an incorrect characterization of the state - of - the - art in understanding of neutron irradiation embrittlement of reactor pressure vessel materials.

The pressure vessel head has been installed at one of the two high - temperature gas - cooled reactor units that make up the demonstration HTR - PM plant under construction at Shidaowan in China's Shandong province.

«This is the first installation of the pressure vessel cover of the world's first Gen IV reactor, indicating that the internal installation of the reactor pressure vessel has been completed before the closure,» CNI23 noted.

Positioned at the bottom of the vacuum vessel, the divertor controls the exhaust of waste gas and impurities from the reactor and withstands the highest surface heat loads of the ITER machine.

In a matter of days, venting of hydrogen from overpressurized reactor vessels led to large explosions at reactors 1, 2, and 3, which experienced full meltdown.

That's one of the reason's I like the boiling water reactor design, yeah the reactor vessel is larger but you have no steam generators and no pressurizer, and all that extra water in the downcomers is useful in emergencies.

In fact, certain of TEPCO's actions in the aftermath of the explosions have been confused and, some might opine, lacking discipline of purpose to the extent that expedient decisions have been made without proper forethought and judiciousness to avoid knock - on consequences: for example, the injection of seawater may have resulted in salt deposits sufficient to foul cooling flows in the lower regions of the RPV [reactor pressure vessel]; the liberation of hydrogen from seawater is more rampant than from freshwater and radiolysis of oxygen from the cooling water could provide stoichiometric conditions and ignition with hydrogen in the absence of air in the containments; and the latest and most recent announcement to deploy a nitrogen purge to the Unit 1 reactor seems yet another ill - explained and unjustified desperate measure».

Start pumps to wash and rinse reactor vessels, to exhaust gases and vapors, to regulate the flow of oil, steam, air to towers, and to add products to converter or blending vessels.

Control volume of chemicals to ensure balanced flow to clarifiers, reactors, and storage vessels