08 September 2009

Nuclear reactor

The invention: 

The first nuclear reactor to produce substantial
quantities of plutonium, making it practical to produce usable
amounts of energy from a chain reaction.

The people behind the invention:

Enrico Fermi (1901-1954), an American physicist
Martin D. Whitaker (1902-1960), the first director of Oak Ridge
National Laboratory
Eugene Paul Wigner (1902-1995), the director of research and
development at Oak Ridge

The Technology to End a War

The construction of the nuclear reactor at Oak Ridge National
Laboratory in 1943 was a vital part of the Manhattan Project, the effort
by the United States during World War II (1939-1945) to develop
an atomic bomb. The successful operation of that reactor
was a major achievement not only for the project itself but also for
the general development and application of nuclear technology.
The first director of the Oak Ridge National Laboratory was Martin
D. Whitaker; the director of research and development was Eugene
Paul Wigner.
The nucleus of an atom is made up of protons and neutrons. “Fission”
is the process by which the nucleus of certain elements is split
in two by a neutron from some material that emits an occasional
neutron naturally. When an atom splits, two things happen: A tremendous
amount of thermal energy is released, and two or three
neutrons, on the average, escape from the nucleus. If all the atoms in
a kilogram of “uranium 235” were to fission, they would produce as
much heat energy as the burning of 3 million kilograms of coal. The
neutrons that are released are important, because if at least one of
them hits another atom and causes it to fission (and thus to release
more energy and more neutrons), the process will continue. It will
become a self-sustaining chain reaction that will produce a continuing
supply of heat.
Inside a reactor, a nuclear chain reaction is controlled so that it
proceeds relatively slowly. The most familiar use for the heat thus
released is to boil water and make steam to turn the turbine generators
that produce electricity to serve industrial, commercial, and
residential needs. The fissioning process in a weapon, however, proceeds
very rapidly, so that all the energy in the atoms is produced
and released virtually at once. The first application of nuclear technology,
which used a rapid chain reaction, was to produce the two
atomic bombs that ended World War II.

Breeding Bomb Fuel

The work that began at Oak Ridge in 1943 was made possible by a
major event that took place in 1942. At the University of Chicago,
Enrico Fermi had demonstrated for the first time that it was possible to
achieve a self-sustaining atomic chain reaction. More important, the reaction
could be controlled: It could be started up, it could generate heat
and sufficient neutrons to keep itself going, and it could be turned off.
That first chain reaction was very slow, and it generated very little heat;
but it demonstrated that controlled fission was possible.
Any heat-producing nuclear reaction is an energy conversion
process that requires fuel. There is only one readily fissionable element
that occurs naturally and can be used as fuel. It is a form of
uranium called uranium 235. It makes up less than 1 percent of all
naturally occurring uranium. The remainder is uranium 238, which
does not fission readily. Even uranium 235, however, must be enriched
before it can be used as fuel.
The process of enrichment increases the concentration of uranium
235 sufficiently for a chain reaction to occur. Enriched uranium is used
to fuel the reactors used by electric utilities. Also, the much more plentiful
uranium 238 can be converted into plutonium 239, a form of the
human-made element plutonium, which does fission readily. That
conversion process is the way fuel is produced for a nuclear weapon.
Therefore, the major objective of the Oak Ridge effort was to develop a
pilot operation for separating plutonium from the uranium in which it
was produced. Large-scale plutonium production, which had never
been attempted before, eventually would be done at the Hanford Engineer
Works in Washington. First, however, plutonium had to be pro-
duced successfully on a small scale at Oak Ridge.
The reactor was started up on November 4, 1943. By March 1,
1944, the Oak Ridge laboratory had produced several grams of plutonium.
The material was sent to the Los Alamos laboratory in New
Mexico for testing. By July, 1944, the reactor operated at four times
its original power level. By the end of that year, however, plutonium
production at Oak Ridge had ceased, and the reactor thereafter was
used principally to produce radioisotopes for physical and biological
research and for medical treatment. Ultimately, the Hanford Engineer
Works’ reactors produced the plutonium for the bomb that
was dropped on Nagasaki, Japan, on August 9, 1945.
The original objectives for which Oak Ridge had been built had
been achieved, and subsequent activity at the facility was directed
toward peacetime missions that included basic studies of the structure
of matter.


The most immediate impact of the work done at Oak Ridge was
its contribution to ending World War II. When the atomic bombs
were dropped, the war ended, and the United States emerged intact.
The immediate and long-range devastation to the people of Japan,
however, opened the public’s eyes to the almost unimaginable
death and destruction that could be caused by a nuclear war. Fears
of such a war remain to this day, especially as more and more nations
develop the technology to build nuclear weapons.
On the other hand, great contributions to human civilization
have resulted from the development of nuclear energy. Electric
power generation, nuclear medicine, spacecraft power, and ship
propulsion have all profited from the pioneering efforts at the Oak
Ridge National Laboratory. Currently, the primary use of nuclear
energy is to produce electric power. Handled properly, nuclear energy
may help to solve the pollution problems caused by the burning
of fossil fuels.

See also Breeder reactor; Compressed-air-accumulating powerplant; Fuel cell;
Geothermal power; Heat pump; Nuclear power plant; Solar thermal engine; Nuclear reactor


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