The Negative Effects of Nuclear Energy Essay

This essay has a total of 1913 words and 14 pages.

The Negative Effects of Nuclear Energy


In 1950, the first commercial nuclear power
plants were constructed. The public was promised
a non-polluting and resourceful type of energy, but
how safe was, and is, nuclear energy? Although
there are less than 500 licensed nuclear power
plants in the world, many nuclear accidents have
already been endangering civilian lives. More
serious accidents are not just likely, but inevitable
(Fairchild 29). Nuclear energy may appear to be
the ideal source of energy for the future: however,
there are many negative effects of nuclear energy
that can lead to very dangerous situations.

Energy has always been among the basic human
concerns, along with food and shelter. It takes
part in all activities, from walking to the operation
of even the most complicated equipment. Mankind
has been faced with the challenge of meeting its
energy needs without risking human health and the
environment.

The many types of energy are mechanical, thermal,
chemical, electrical, radiant, and atomic (Microsoft
Encarta). In 1987, oil supplied 32% of the energy
worldwide. Coal was next in line with 26%, then
natural gas with 17%, biomass 15%, and nuclear
energy with only 4% (Galperin 19). With the main
sources of our energy running low, nations look to
new sources to provide our society with power.
Nuclear energy, the newest type of energy, was
researched to see if it would be the most
promising type of energy for the future.

Surprisingly, nuclear energy was discovered by
accident. In 1896, the French scientist, Antoine
Henri Becquerel, conducted an experiment with
uranium salts and found that these salts gave off
their own light when exposed to sunlight. Marie
and Pierre Curie were fascinated by the
possibilities of Becquerel’s rays. The Curies
discovered exactly what the rays were and then
named the phenomenon radioactivity (Halacy 6).

During World War II, many scientists from around
the world came to the United States to work on
nuclear reactors and weapons. With much
success, they continued after World War II and
concentrated more on nuclear energy. The
scientists instantly saw that nuclear energy would
be a great source of power because of the amount
of power it released. Splitting an amount of
uranium equal to one penny would produce as
much energy as seven and a half tons of coal
(Lilienthal 85).

A nuclear power plant is where energy is formed
when nuclear fission or fusion takes place. So far,
however, only the power of fission has been
controlled and used for energy. There are many
parts of the nuclear power plant, including the
reactor, generator, control room, cooling systems,
and the electrical, air, and water lines. The heart of
the nuclear power plant is its reactor core, which
contains a few hundred fuel assemblies. The
reactor core is encased in a pressured steel tank
with walls several inches thick. In most reactors,
this vessel is enclosed in a containment structure.
This is a steel-reinforced concrete dome that is
about three feet thick and serves as the outermost
barrier between the plant and the environment
around it. This helps prevent radiation from
escaping the plant (Galperin 42).

There are many different types of nuclear reactors,
but all the power plants in the United States and
more than three-quarters of those worldwide are
light-water reactors. There are two types of
light-water reactors, which are boiling-water and
pressurized-water reactors. Both types use
ordinary water as coolant and require enriched
uranium (Microsoft Encarta).

In boiling-water reactors, cooling water surrounds
fuel assemblies. The heat of nuclear fission makes
the water boil and the steam produced is carried
away from the core to the turbines. Once its work
is done, the steam is condensed to water and it
returns to the reactor (Galperin 44).

The pressurized-water reactor is more commonly
used than the boiling-water reactor. This reactor
seals the cooling water in a closed loop and adds
a heat-exchange system. Water in the reactor core
gets hot, but it does not turn to steam. The hot
water is piped through a steam generator and
converts a secondary water supply into steam to
power the turbine. The two water supplies do not
mix (Galperin 45).

A gas-cooled reactor is similar to a
pressurized-water reactor. The only main
difference is that helium or carbon dioxide gas
replaces the water in the primary loop. These
reactors cost more to operate and to build, but are
more energy efficient (Galperin 46).

The last main type of reactor is a breeder-reactor.
This is very different then other reactors because it
produces more fissionable material then it
consumes. A breeder reactor fuels with a
combination of plutonium and uranium. A breeder
reactor would be extremely useful if uranium was
scarce. It takes about 10 to 60 years to use up the
fuel from just one cycle (Galperin 46).

Radiation is very strong in the nuclear waste of
power plants. Nuclear waste exists in several
forms. One form is called high-level waste, and the
other is called low-level waste. High-level waste is
mostly from the used fuel rods and other materials
exposed to as much radiation as they are.
High-level wastes can let out very large amounts
of radiation for thousands of years. There is no
place to store this waste that is safe, and it will
always be radioactive. But for now, they are
stored in the ground. Other proposed storing
solutions are sending it to space, burying it in the
core of the earth, burying it in the ocean, or
burying it under the Antarctic ice. Even these ideas
have the potential of severely damaging the earth.
An example of low-level waste is the waste left in
the reactor water. This waste is less radioactive,
but is still very dangerous (Galperin 65).

Two engineers in Connecticut have, not too long
ago, caught the Nuclear Regulatory Commission
(NRC) in a dangerous game of disobeying the
rules. The NRC has been regularly disobeying
safety rules to let plants keep the cost down and
stay open to operate (Microsoft Encarta). Two
senior engineers started questioning after one of
them had checked the specifications of the cooling
system in a power plant.

After eighteen months of operation, a nuclear
power plant is temporarily shut down. They have
to get rid of the used fuel rods and replace them
with new ones. The old rods are very hot and
radioactive. Places to store the old fuel rods are
rather limited, especially since the federal
government has never designated an official
storage place for this high-level waste. So where
Continues for 7 more pages >>




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