Three Mile Island accident

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PostSun Jun 24, 2012 5:06 pm » by weasel666


The Three Mile Island accident was a partial nuclear meltdown which occurred at the Three Mile Island power plant in Dauphin County, Pennsylvania, United States on March 28, 1979. It was the worst accident in U.S. commercial nuclear power plant history, and resulted in the release of small amounts of radioactive gases and radioactive iodine into the environment.

The power plant was owned and operated by General Public Utilities and Metropolitan Edison (Met Ed). The reactor involved in the accident, Unit 2, was a pressurized water reactor manufactured by Babcock & Wilcox.

The accident began at 4 a.m. on Wednesday, March 28, 1979, with failures in the non-nuclear secondary system, followed by a stuck-open pilot-operated relief valve (PORV) in the primary system, which allowed large amounts of nuclear reactor coolant to escape. The mechanical failures were compounded by the initial failure of plant operators to recognize the situation as a loss-of-coolant accident due to inadequate training and human factors, such as human-computer interaction design oversights relating to ambiguous control room indicators in the power plant's user interface. In particular, a hidden indicator light led to an operator manually overriding the automatic emergency cooling system of the reactor because the operator mistakenly believed that there was too much coolant water present in the reactor and causing the steam pressure release. The scope and complexity of the accident became clear over the course of five days, as employees of Met Ed, Pennsylvania state officials, and members of the U.S. Nuclear Regulatory Commission (NRC) tried to understand the problem, communicate the situation to the press and local community, decide whether the accident required an emergency evacuation, and ultimately end the crisis. The NRC's authorization of the release of 40,000 gallons of radioactive waste water directly in the Susquehanna River led to a loss of credibility with the press and community.

In the end the reactor was brought under control, although full details of the accident were not discovered until much later, following extensive investigations by both a presidential commission and the NRC. The Kemeny Commission Report concluded that "there will either be no case of cancer or the number of cases will be so small that it will never be possible to detect them. The same conclusion applies to the other possible health effects". Several epidemiological studies in the years since the accident have supported the conclusion that radiation released from the accident had no perceptible effect on cancer incidence in residents near the plant, though these findings are contested by one team of researchers. Cleanup started in August 1979 and officially ended in December 1993, with a total cleanup cost of about $1 billion. The incident was rated a five on the seven-point International Nuclear Event Scale: Accident With Wider Consequences.

Communications from officials during the initial phases of the accident were confusing. There was an evacuation of 140,000 pregnant women and pre-school age children from the area. The accident crystallized anti-nuclear safety concerns among activists and the general public, resulted in new regulations for the nuclear industry, and has been cited as a contributor to the decline of new reactor construction that was already underway in the 1970s. Public reaction to the event was probably influenced by The China Syndrome, a movie which had recently been released and which depicts an accident at a nuclear reactor.

For more info check this link

The American Experience: Meltdown At Three Mile Island

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PostSat Apr 26, 2014 8:03 pm » by OtheklzeR

there was one confirmed case of cancer that was directly attributted to three mile island

Gordon Warren a senior electrical engineer at rockwell and NRC ,who was transported
by air force in the dark of nightto three mile island with to hydrogen recombidant machines .

basicly the burning (read melt down) of the cladding (zirconium) of the pellets of
uranium oxide gives off hydrogen gas, Gordon (a person I knew since childhood)
burned the hydrogen gas with oxygen to form water vapor that was further
coold and condensed into liquid water for radioactive disposal.

the hydrogen gas was building up close to bursting the pressurized containment
while a the building was built to withstand two 747 strikes from outside
an internal explosion of a mear 10,000 lbs of tnt would have spread containment for over
fifty miles at nearly 150 tons of pyle that is in excess of 4.5 billion curies of contamination

Gordon soon lost his battle with cancer saving the lives of tens of thousands of people
in both three mile island and the clean up at rocky flats in colorado

HEROS are often un adorned with praise and too modest
goverments would rather keep the whole thing quiet
but often goverment workers do such valliant things
that must needs be their praise be stomped out by even just
one voice, over and over.

not every goverment employee is useless
and you I can assure you will rarely hear about
them and their sacrifice

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