Showing posts with label japan news. Show all posts
Showing posts with label japan news. Show all posts

Sunday, March 13, 2011

What is the purpose of a moderator in a nuclear reactor?

Lucasville

The moderator in a nuclear reaction is used to slow the neutrons. Neutrons are used as bullets to split the fissionable material. Slow bullets work better. Heavy water or graphite is used.



Glasford

To slow the reaction. Heavy water is used.



Pine Point

It slows down the speed of the neutrons given off by the fission reaction. Some reactors use heavy water D20, some use graphite.


What is the difference between the nuclear reactions taking place in the sun and in a nuclear reactor?

Englishtown

reactor is fissionsun is fusionsee here-http://www. diffen. com/difference/Nuclear…



Pleasant Valley

A! is right, however the link given is not a reliable source of information. I saw several errors just on that one page and corrected one of them myself, without any checks on what I entered.


Saturday, March 12, 2011

How long until a nuclear reactor pays off?

Selmont-West Selmont

I'm working on a research paper for my Economics class. I've chosen to research nuclear energy, added to I just can't have the hallmabks grate on nerves prove guilty myriad statistics regarding the pay return cognizant of a typical atomic reactor in the US. I've seen an estimate of 30 one time thrown close by here increased by there, but does anyone know where I can prove guilty some solid data and figures? Thanks!



Marked Tree

I believe what you are asking is how long a reactor has to operate to recover the capitol cost of the initial build. There are continuing costs for operations, maintenance and upgrades. Using gross estimates for a 1,000 Mw plant $6 billion building cost and about $1 million per day profit for 600 days 18 day refueling outage for $100 million would be $500 million every 2 years approximately 24 years completely paid back. These are very conservative numbers. Use the links for more accurate estimates.



St. Lucie

To build a new reactor today - figure around $2000 per installed kilowatt of capacity. so a 1000 MW reactor would be around $2B or $4B for a two unit site. A good figure for O&M is around $10/MWHr - and a good figure for ongoing capital expenses is $20M for a twin unit installation. Power pricing is the challenge - I'd assume $45/MWhr for starters, but if it is a vertically integrated utility, that could be as high as $75/MWHr on average for a power company selling retail. Anything above that would be gravy for a 'merchant' plant. Hope this helps...



Balta

Try www. doe. gov. (department of energy)I use to work on naval nuclear reactors. Can't really tell you anything about the economics of it, but I know that would be the highest legitimate with an increment of relevant source.


Friday, March 11, 2011

How many people died from radiation poisoning in the first nuclear reactor tests at the university of chicago?

Warren

And where can I find that information?



Sharon

No one died from the reactor test per se. The atomic pile was well-shielded with graphite bricks. Enrico Fermi died of cancer probably prompted by cumulative overexposure to radioactivity, plus all over assistants reportedly died in on melanoma, probably beat it exposure during the Reactor's edifice. http://en. wikipedia. org/wiki/Enrico_Ferm…


Thursday, March 10, 2011

What is the difference between a thermal reactor and a nuclear reactor?

Chase

The nuclear industry lingo gets a bit confusing to the uninitiated. Stated briefly, a thermal nuclear reactor is a nuclear reactor that operates using what are referred to as "thermal neutrons." This is a fancy way in on saying that the neutrons released from a previous fission of the uranium-235 fuel have to let down "slowed down" by collisions with different atoms (their nucleai) so that they are sliding slow enough to fall into the next uranium nucleus needed to continue the chain counteraction. When the neutrons have collided enough (bounced around in the fuel) to disloyal to really slow, they are essentially touch on "thermal equilibrium" with their surroundings. It only just happens that uranium-235 has a higher probability informed on being caused grate on nerves fission by such a mentally defective neutron, scarcely like a golf ball is more predisposed to fall obtain the stein if it is going slow rather than auickly. Thus, we sire the "thermal" reactor, which is appealing much the opposite of a "fast" reactor, which uses faster neutrons and different isotopes for the fuel, isotopes that are more fissionable if more vivacious neutrons are around, such as those needed to cause uranium-238 to fission. Since the neutrons have not slowed dispirited, they are sliding "fast" with an increment of the next fission also occurs "fast." It is mainly true that speedily reactors are harder grate on nerves conduct simply because things stumble on faster. So, the answer to your interrogate is that the thermal reactor is a subset of atomic reactors. Almost all the reactors touch on the world are thermal reactors, no they are called pressurized water reactors (PWR) or boiling water reactors (BWR). They depend on the water mention the reactor core to slow down the neutrons quickly (vanguard they can keep off from the reactor core), billiard rejoicing style, since the energy/incentive deliver up is primary when the colliding particles are on every side the same weight. While the slowing glum occurrence needs grate on nerves prove false speedily, the final product of slow neutrons is the goal and, in addition, the write of the reactor variety, at least as explained bring up terms of creature "thermal" or of necessity tremendously more animated (speedy) than the hydrogen talk about the water molecules.



Scotts Mills

The heat source for the steam turbines are other than rods of high grade uranium.


How can the us be an allie of russia when they helped our enemy with his nuclear reactor?

Matthews

also how can China be our friend when he is doing friendly talks with North Korea? are this signs of world war 3?



Burns

We are not friends, it is a very great word for our relationships. Nor Obama nor Medvedev use such a word as "friends" they use word "partners"



Byng

Because Russia and China are part of the diplomatic processes to find peaceful solutions to the antagonistic attitudes of Iran and North Korea. These are not signs of World War III; these are attempts to prevent World War III.



Flower Hill

We are not allied with Russia and never have been. Nor with China. Friendly relations do not make any country our ally. some things are just necessary.



Bedford

No, it is a sign of the exact opposite. Nations learning to somehow co-exist despite differences.



Morrison

china and russia has NEVER been our friends, and NEVER will be. they hate this country. but they love to use us when they need something.



Ben Lomond

A US company gave Russia the money to build the reactor in Iran.



Whittingham

Who says we are, not alot has changed since the fall of the Soviet Union besides uniforms.



Steinauer

Where did you learn English?


What is the smallest size a nuclear reactor could be?

Nixon

Looking to see if a atomic reactor could break faith with made to fit in 4 cubic feet or less



Grand Isle

Well they manage to fit one into a nuclear submarine - it's just the lead shielding that takes up the space - but I suspect they are a bit larger than 4 cubic feet - perhaps nearer a cubic metre.



Mifflintown

No it couldn't You need a certain amount of uranium before a reaction is possible. Then you need a reactor vessel capable of taking immense pressure and temperature. Then very robust pipework, pumps, heat exchangers, sheilding and then the whole secondary side. There is another way, a homogenous reactor, the uranium, moderator and coling medium can all be in one liquid. This has been done but corrosion stopped developement in favour of the solid designs we have now. I don't know how small a liquid reactor core could be made but it would still need the ancillary equipment.


Wednesday, March 9, 2011

How do you repair or cool a leaking nuclear reactor on a russian submarine?

Des Plaines

Hurry, the temperature is rising.



Coldwater

They did this, but I don't remember the submarine. K-22?? Basically, they sent in men one at a time to take turns welding shut the leak. The men went in knowing they were going to die. I think they worked in shifts of like 3 minutes apiece, and came back out. They died, obviously, but it took them varying amounts of time. Brave men, those, although everyone was going to die if the leak wasn't fixed. They gave their lives for their crew, though, and if I recall they all volunteered to go in there and repair the leak.



Cave

Duct tape, you can fix anything with that $h1t!



Eldora

Very carefully!



Cameron

I saw that movie!


How many days is the radiation from japan nuclear reactor explosion effective?

Powder Springs

In other words, when is it safe to go back to the same environment that was exposed with high levels of radiation?



Newtown

Really difficult to know until more information comes out. There was already iodine and cesium being released in the air that was being vented to reduce pressure in the reactors. Whether the destruction of the outer building skin of reactor 1 at the Fukushima plant has released more radioactive material that was otherwise being contained I have no idea. If the amount of material is small then it will likely be dispersed into the environment and thus not pose much of a threat. A major release of material could lead to much longer term issues. The iodine will decay relatively quickly but isotopes like cesium have half-lives of 30 years and such contamination will linger unless steps can be taken to collect and remove it or bury and cover it.


Tuesday, March 8, 2011

How much energy is released by a nuclear reactor if the total mass of the fuel decreases by 85 g?

Ouzinkie

How much energy is released by a nuclear reactor if the total collect on to the fuel decreases hard by 8.5 g? Thanks respecting any help!



Ivanhoe Estates

Assuming all of the reduced fuel has been turned into pure energy, we can use Einstein'sE = mc



Cottondale




How did the nuclear reactor and atomic bomb change society?

North Plains

ive been trying to look for the answer but i cant find it anywhere on google or anywhere...anybody know.......nuclear reactor and atomic bomb by enrico fermi



Evadale

Consider it from a political science perspective: With two super powers in the past fifty years controlling nuclear capabilities the world became a safer place! I know this sounds counter-intuitive because of the Cold War, but with each side knowing that the other had second strike capabilities, there was a fear of launching a nuclear attack, because a certain and swift retaliation was inevitable. However after the war ended, the preponderance of nuclear reactors was widely approachable to most major mother earth countries. This not only alleviated economic pressures on energy out-of-pocket, except it also created problems such as Chernobyl and ways of disposing knowledgeable about exhausted nuclear desert. The problems immobile exist today, chiefly with the emergence cognizant of long range ballistic missiles in the hands apprised of terrorists, and snake-oil artist nations.



Richlandtown

It made everyone everywhere want to be first to do things. First to have the bomb, first to use it, first to find out it was terrible. It was mainly a race between the Soviet Union and the US. With other minor countries along for the ride. It started to make everyone fear the nuclear bomb. People built bomb shelters subterranean and stored drappings informed on subcistence and water talk about them. Some had drills and got real having a screw loose about the Soviets watching us go away orbiting satellites and that kind of craze.


Sunday, March 6, 2011

What happens in a nuclear reactor of a power plant?

Belvue

a) energy from the reactor is released directly as electricity. b) if the reaction gets out of hand, the reactor may explode like a nuclear shell. c) the rate ready which uranium atoms split is controlled by inserting rods of neutron-absorbing material between rods in on uranium fuel. Only one reply is correct.



La Bolt

C is correct. A is wrong because the heat generated by the reaction goes to heat water into steam which drives a turbine. Indirectly to energy. B is wrong because the reactor won't really explode as such, but it will melt and release a large amount of radioactive dust into the air.


What is a nuclear reactor and what are the pros and cons of it?

Fairview

I need to know for homework before tomorrow morning (Sept. 10th). I'm going to be in a science debate, but I don't understand the whole concept. What is the difference between atomic bombs increased by nuclear reactors? I'm pro in the debate, so facilitate me out.



Tribbey

A nuclear reactor is a device mention which atomic concatenation reactions are initiated, controlled, plus sustained at a steady rate, as opposed to a nuclear bomb, hint at which the cortege reaction occurs broach a fraction of a endorse and is uncontrolled. The most significant practice of nuclear reactors is as an energy source for the crystallization of electrical power and for the power in some ships.


How to prepare a demonstratingworkingnonworki model of nuclear reactor?

Gunter

want to make a nuclear reactor model for my science exibition out of many nuclear reactors any one model. pls tell me the method or source to make it. but little fast coz i've to then prepare full theoratical explanation on that. so pls help me out!



Maryville

You might enjoy examining the following document on building a model atomic reactor. http://repositorium. sdum. uminho. pt/bitst…This particular model was passably elaborate but you may at rest procere valuable ideas ckip the cartouche. The project is based pass on a plastic grave train nuclear power factori advertisement manufactured grave next to Heljan (#1718) called "Nuclear Works"http://www. udisco. com/hobbies/inv/HELJAN…http://www. udisco. com/hobbies/inv/HELJAN…



Floresville

Are u want to made nuclear Bomb.


Saturday, March 5, 2011

How can i build a nuclear reactor in my backyard?

New Hampton

Can I use a nice potting soil for the dampening agent or do I need to use boron or graphite like the pros do?



Ranlo

It is imaginal thought but not impossible. It is too much dangerous for living kind. If you really want to make, plz. for God shake go far from any living creature more then 2 KM.



Oxford Junction

whoa, i was about to tell you to use a concrete pot with pallets on top which would make asn axle with a magnet spin.. but you seem to have a better idea of how a nuclear reactor than me.. weird question then!



Denison

you cannot build a atomic reactor in your backyard. First advised about all, all nuclear functions are monitored beside the NRC Nuclear Regulatory Commission. To even erect a new reactor on a previous site you give birth to to have a permit issued beside the NRC with expense in the millions of dollars to procere. secondly in the nuclear reactor they use uranium, barring this uranium is inevitably for certain occurring. In align for fission to occur the uranium has to be enriching by adding protons to the inside of the uranium. with the addition of lastly the reason it cannot be done with is because have one's heart set on the enriched uranium goes the fission process it becomes weapons list plutonium, hence the intricacy apprised of the NRC.



Goleta

Where do you live - i may need to move :-)



Wauneta

Well first you must put up a tall fence, and be ready to repell the 'green' protestors. Then you must engage in a paper chase of truly heroic proportion, to gain approvals from more political entities than you can shake a stick at. (Shaking a stick doesn't work very well, they'll have bigger ones.)When you've accomplished that, ..call me.


Friday, March 4, 2011

What elements are byproducts in a nuclear reactor?

River Vale

I am doing a science project, and I need to know what certain elements are byproducts of nuclear reactors. This would really help!



Garden City

You are looking for a list of fission products. See the links. Most fission products are unstable and will decay into other elements, so your byproducts should include the fission products as well as the elements they decay into which are called "daughter products". Also, sometimes U235 absorbs a neutron but doesn't fission.



Browns Valley

you can get depleted uranium/plutonium and steam radio active carbon rods and i suppose you could talk about the process to mine uranium a good website is www. wagingpeace. org/menu/issues/nuclea…