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Davis-Besse Nuclear Power Station, Ohio, USA

Davis-Besse Nuclear Power Station – Projects – Bechtel

Bechtel has been replacing the two “once-through” steam generators and the reactor vessel closure head at Davis-Besse Nuclear Power Station near Oak Harbor, southeast of Toledo, Ohio. Owned by FirstEnergy Nuclear Operating Company, Davis-Besse is a pressurized-water reactor that produces 908 megawatts of electricity, enough to power 450,000 homes.
The generators function as heat exchangers, producing the steam that drives the turbine generator. Each of the new steam generators for Davis-Besse weighs 550 tons.
Bechtel was the original architect engineer for Davis-Besse when the plant was constructed in the 1970s. We also performed the Davis-Besse head replacement in 2002 and the Beaver Valley Unit 1 steam generator replacement in 2006.
Davis-Besse Nuclear Power Station – Projects – Bechtel

The Davis-Besse plant supplies a significant amount of Ohio’s electricity, and Ohio is among the top 10 U.S. electricity producers. The continued safe and efficient operation of Davis Besse not only generates power and provides good jobs—it avoids the emission of millions of tons of SO2, NOx, and CO2. Nuclear power plants supply about 12 percent of the state’s electricity.
Ohio’s industrial sector accounts for more than a third of the state’s energy consumption. Ohio is home to a number of energy-intensive industries, such as chemical and glass manufacturing, glass making, metal casting, and steel production. Ohio is a net importer of electricity.
Davis-Besse Nuclear Power Station – Projects – Bechtel

Steam generators use heat from a nuclear power plant’s reactor core to create steam, which drives the plant’s turbines to create electricity.

Each steam generator contains thousands of alloy tubes through which hot radioactive water is pumped under high pressure. This process prevents the water from boiling. As the water flows through the tubes, it heats nonradioactive water outside the tubes to make steam.

A typical steam generator has more than 3,000 alloy tubes. The tubes were expected to last for about 40 years, but metallurgy and water chemistry issues often shorten their useful lives considerably. When about15 percent of these tubes have corroded, a plant suffers from significant maintenance costs and the inability to maintain full power.

Source : bechtel company

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