The Tennessee Valley Authority has begun replacing 108 sirens near the Sequoyah nuclear plant – part of a $7 million program that will also upgrade sirens at TVA's Browns Ferry and Watts Bar sites.Sequoyah's existing sirens are three decades old and can't function without power from the grid. The new equipment will include battery backups, rotating sirens and steel poles, the Chattanooga Times Free Press reported. Their locations and number also will change. Four sirens will be added to the system to accommodate changes in development and wind patterns near the plant.About 80,000 people live within a ten-mile radius of Sequoyah. It is located about 9.5 miles northeast of Chattanooga, Tenn., according to the Nuclear Regulatory Commission.
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