Davis–Besse Nuclear Power Station

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Active reactors ( gross ):

Set planning ( gross ):

The Davis-Besse nuclear power plant (English Davis Besse Nuclear Power Station ) is a nuclear power plant with a pressurized water reactor. The nuclear power plant is located in the U.S. state of Ohio on the shores of Lake Erie near Oak Harbor.

History

The construction of the nuclear power plant began on 24 March 1971. Farms is the powerhouse of the FirstEnergy Corp.. The block ended on August 28, 1977 to the network.

The reactor is a 925 megawatt pressurized water reactor of the Babcock and Wilcox. From 2002 to early 2004, the plant was shut down in order to modernize them.

Incidents

On September 24, 1977, a pressure relief valve opened in the primary circuit, which is why steam emanated. The staff of the control room could not bring under control a long time the situation. There was a danger that the core of the reactor would have due to the strong loss of coolant can be exposed and heated. Before it happened, the valve could be closed again. Some years later, the accident of category 3 was assigned on the International Nuclear Event Scale evaluation.

On June 9, 1985, occurred in the start-up of the refrigeration system to a fault of a pump having a high speed due to the erroneous operation of an operator. To counteract this, the flow rate is throttled. Shortly thereafter, there was a pressure to another pump. The operators switched off the pump. However, the circulation of the coolant flow is stopped thereby. To counteract this, an operator activated the Notspeisewasserpumpen. It was not until the event was classified as "extraordinary "; later they investigated the incident in more detail and found that it almost came to meltdown ( meltdown of the reactor core ). According to estimates by the IAEA of the accident on the INES was, so to be seen with at least level 4 "accident."

In March 2002 it was found at a longer -delayed inspection found that boric acid had leaked near a control rod carrying the lid of the reactor pressure vessel of the reactor. The boric acid is used to control the reactor and is added to the coolant. However, the acid reacts very aggressively to heavy metals. As a result, there was severe corrosion of the reactor lid, leaving only remained a few millimeters thin layer of the lid inner lining. Experts from the Oak Ridge National Laboratory calculated then that it would have taken in the worst case, five months before a large leak would have formed in the reactor lid. The nuclear experts of the NGO Union of Concerned Scientists (UCS ), this scenario combined with the problems that were discovered several years ago in connection with clogging of sump strainers some nuclear power plants. The loss of cooling water from this leak would have meant that insulation had been demolished, which would have clogged the pump screens the emergency cooling. According to the UCS, the consequences would have been different than the nuclear power plant at Three Mile Iceland, where there was a meltdown in 1979. According to the UCS containment (safety building) could fail and that most likely after two days at the melt-through of the corium through the building foundation. It is during this process much carbon monoxide and hydrogen is released, which may explode under reaction with oxygen and can cause damage to the containment.

Data of the reactor units

The Davis-Besse nuclear power plant has an in-use block and dropped two blocks:

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