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U.S. Nuclear Reactors

Reactor:
Sequoyah Unit 1
Location:

Soddy-Daisy, Tennessee
Local population: 101,914 (10-mile radius)

Type:

Pressurized Water Reactor

Status:

Operating
Licensed to operate from 09/17/80-09/17/20

Owner:

Tennessee Valley Authority

Safety Issues:

Earthquake Risk, Flooding Hazard, Groundwater Leaks Reported, Heightened NRC Attention, Year Plus Outages


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Related Links & Documents

12/05/2012   An All Things Nuclear blog post commended the owner for upgrading the emergency sirens used to warn the public in event of an accident.

09/18/2006   UCS documented the factors leading to the year-plus reactor outage that began in March 1993 in this case study for our Walking a Nuclear Tightrope report.  See details | Download the pdf (1.5 kb)

09/18/2006   UCS documented the factors leading to the year-plus reactor outage that began in August 1985 in this case study for our Walking a Nuclear Tightrope report.  See details | Download the pdf (1.5 kb)

06/30/1999   Fission Stories #43 describes recurring problems with the run-off from heavy rainfall entering the turbine building and threatening electrical equipment.

07/11/1994   Fission Stories #43 describes recurring problems with the run-off from heavy rainfall entering the turbine building and threatening electrical equipment.

09/1992   Fission Stories #53 describes the plant’s owner selling a locked file cabinet to a local church. When church officials opened the cabinet, they found it filled with security blueprints and related details.

03/18/1992   Fission Stories #11 explains how workers discovered 11 of the 48 doors that open during an accident to admit steam into the ice vaults to protect the containment from excessive pressure and temperature conditions to be immovable due to the vault’s floor buckling in the cold atmosphere.

04/19/1984   Fission Stories #32 chronicles how 8 workers narrowly escaped death when 16,000 gallons of hot, highly radioactive water leaked into the small room in which they were working.

02/11/1981   Fission Stories #96 explained how a test gone awry sprayed nearly 110,000 gallons of water into the containment.

09/17/1980   Fission Stories #89 described the brinksmanship between the NRC and TVA. After the NRC proposed a $29,000 fine on TVA for a safety violation at Browns Ferry, TVA responded that it was illegal for NRC to fine another federal agency like TVA.

05/31/1979   Fission Stories #73 explained how a walkie-talkie inadvertently triggered the start of emergency systems for the unneeded injection of makeup water into the reactor vessel.