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    Union of Concerned Scientists

(Southwest and West). The Northeast has the oldest reactors in the country as well as the highest energy consumption; the Southeast has the Tennessee Valley Authority (with its large number of nuclear power plants).

gas-cooled reactors have experienced year-plus reactor outages, resulting in a higher outage rate for those reactor types than the more common pressurized water reactor or boiling water reactor (Figure 8).

Technology and Time

Most of the nuclear power plants in the United States feature pressurized water reactors. The next most popular type is the boiling water reac- tor. The country’s sole liquid metal fast breeder reactor and one of its two high-temperature

Figure 9 demonstrates that there is no partic- ular age at which nuclear reactors are more likely to experience extended outages. Three year-plus outages occurred during the first year of opera- tion, but even reactors that have been operating for more than 20 years have had to shut down for a year or more.

Figure 6. Percent of Reactors Experiencing Year-plus Outages (by State)

150%

140%

130%

120%

120%

100%

100%

100%

100%

100%

100%

83.3%

80%

75.0%

71.4%

66.7%

60%

60%

50%

50%

50%

40%

40%

    • 33.3

      %

    • 28.6

      %

    • 21.4

      %

33.3%

20%

0%

Alabama

Arizona

California

Colorado

Connecticut Florida

Illinois

Maine

Maryland Massachusetts

Michigan

New Jersey

New York

North Carolina

Ohio

Pennsylvania

Tennessee

Texas

Virginia

NOTE: Total can exceed 100% if the number of outages is greater than the total number of reactors in the state.

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