Can you guess what are they? What is the connection between this previous picture

Download 6,41 Mb.

Bog'liq
ASPEKT 2 Nuclear energy

Can you guess what are they?

Nuclear fission is the splitting of a large nucleus, releasing HUGE amounts of energy.
Nuclear fusion is the combining of smaller nuclei to form heavier nuclei, releasing HUGE amounts of energy.

Nuclear reactions in a nuclear power plant occur at a controlled, manageable pace and release energy slowly.
Heat is generated and used to boil water, creating steam. The steam turns turbines which rotate electric generators, creating electricity.
Steam is released from the cooling towers.
(click on picture for more info)

Rich energy source.
1 gram of Uranium-235 delivers as much
energy as 3.5 metric tons of coal.
Reactors run for years without refueling or being shut down and need little maintenance.
No air pollution!

The most serious nuclear accident in the U.S. occurred in 1979 at Three Mile Island nuclear power plant in Pennsylvania.
A small amount of radioactive gas escaped the containment structure.

Plutonium, cesium, strontium, and other “-ium” elements created in a nuclear reactor emit dangerous radiation that can literally knock electrons off the atoms of our cells, disrupting or destroying cell function or even causing cells to mutate into cancer cells.
Radioactive elements emit radiation because they are unstable; they’d rather be something else.
They achieve this by going to pieces; emitting particles and waves billions of times per second. This process is called a half-life.

Every radioactive element has a half-life
Half-life is the time it takes for half of its atoms to decay.
Half-lives range from a fraction of a second to billions of years – 4.5 billion for uranium 238.
The longer the half-life, the less intense the radiation.
After 10 half-lives, an element is usually harmless

The most dangerous radioactive waste
Spent fuel comes from nuclear reactors (52,000 tons)
liquid and solid waste from plutonium production (91 million gallons).
About 70 percent of the available storage space is now filled with used fuel assemblies at Turkey Point.

Includes clothing, tools, and other materials contaminated with plutonium, neptunium, and other man-made elements heavier than uranium. (11.3 million cubic feet)

Includes radioactive and hazardous wastes from hospitals, research institutions, and decommissioned power plants (472 million cubic feet)
Turkey Point produced annually on average about 2,500 cubic feet of low-level waste. This amount of waste could be contained within an area about the size of a 30'x30' room.

Download 6,41 Mb.

Do'stlaringiz bilan baham: