Page 3&4:Effects of nuclear weapons.

Page 5&6: parts of a nuclear reactor.

The development of nuclear energy

In 1972, scientists discovered a natural chain reaction had occurred nearly 2 billion years ago in a uranium deposit in the west-central part of Africa. Two billion years ago, radioactive decay had not progressed so far a sit has today because of this, he are contained enough U-235 to start a chain reaction. An accumulation of ground

water acted as a moderator to begin the reaction. The heat

from the reaction wormed up the water which turned the water into steam, less and less water was available this

means that the moderator ran out and the reaction died out. Except for such rare occurrences, such as, nuclear energy was not released on a large-scale on earth until 1942. That year scientists produced the first artificially

made chain reaction. Scientific discoveries that took place

within the last 100 years made the large-scale release of

What is nuclear winter

Nuclear reactors also have a biological shield and a safety system . The biological shield is made up of thick concrete blocks that surround the pressure vessel. This shield protects reactor operators and technicians as well as the general public from radiation exposure . The concrete absorbs the gamma rays and neutrons that escape from the pressure vessel.

Effects of nuclear weapons

Nuclear weapons devices can have a wide variety of

The safety system has devices designed to prevent serious reactor accidents. It has a set of safety rods that permits rapid shut down of a reactor. These rods, which act like control rods, are automatically inserted into the reactor core when the neutron counting instruments detect an abnormal increase in the rate of fission. The reactor will then shut down.

Some common words found in the essay are:
, nuclear winter, chain reaction, gamma rays, nuclear energy, nuclear weapons, pressure vessel, nuclear radiation form, development nuclear energy, radiation form radiation, neutrons gamma rays, nuclear reactors, radiation form, gamma rays neutrons, safety system, form radiation,
Approximate Word count = 1163
Approximate Pages = 5 (250 words per page double spaced)