Browns Ferry Nuclear Power Plant

The Browns Ferry nuclear power plant is located on the Tennessee River near Decatur and Athens, Alabama, on the north side (right bank) of Wheeler Lake. The plant is named after a ferry that operated at the site until the middle of the 20th century. The site has three General Electric boiling water reactor (BWR) nuclear generating units and is owned entirely by the Tennessee Valley Authority.

Unit One

Unit One is a 1,065 MWe BWR built by General Electric which originally came online on December 20 1973, and is licensed to operate through December 20 2033. However, Unit One was shut down for a year after a fire in 1975 caused major damage to the unit. The unit was subsequently repaired and operated from 1976 through 1985, when all three Browns Ferry units were shut down for operational and management issues. Units Two and Three were restarted in 1991 and 1995, respectively.

Starting in 2002, TVA undertook to restore Unit One to operational status, spending $1.8 billion to do so. The United States Nuclear Regulatory Commission (NRC) approved the restart of Unit 1 on May 15 2007 and the reactor was brought up to criticality on May 22 for the first time since March 3 1985. [http://www.tva.gov/news/releases/aprjun07/restart.htm] During initial testing after restart, on May 24 2007, a leaky hydraulic control pipe in the turbine hall burst, spilling about 600 gallons of non-radioactive fluid, and the newly restarted reactor was temporarily powered down. Reactor power-up and tests resumed on May 27 and the unit started supplying power to the electricity supply grid on June 2 2007, reaching full power on June 8. The reactor has automatically shut itself down five times since June 2 [http://www.waaytv.com/Global/story.asp?S=7241726] , leading to additional NRC oversight [http://www.nrc.gov/reading-rm/doc-collections/news/2008/08-007ii.html] . The Browns Ferry restart will pay for itself in five years. [http://www.bloomberg.com/apps/news?pid=20601103&sid=agGMCRlWdMyU&refer=us]

Unit One can generate 1,155 MW of electricity, and TVA plan an uprate to 1280 MWe for this and the other two reactors.

Unit One fire

The March 22 1975 fire started when a worker using a candle to search for air leaks accidentally set a temporary cable seal on fire. At Browns Ferry, foamed plastic covered on both sides with two coats of a flame retardant paint was used as a firestop. The fire spread from the temporary seal into the foamed plastic, causing significant damage to the reactor control cabling in the station.

From [http://www.nrc.gov/reading-rm/doc-collections/gen-comm/bulletins/1975/bl75004a.html NRC IE BULLETIN NO. - 75-04A] :

The fire started in the cable spreading room at a cable penetration through the wall between the cable spreading room and the reactor building for Unit 1. A slight differential pressure is maintained (by design) across this wall, with the higher pressure being on the cable spreading room side. The penetration seal originally present had been breached to install additional cables required by a design modification. Site personnel were resealing the penetration after cable installation and were checking the airflow through a temporary seal with a candle flame prior to installing the permanent sealing material. The temporary sealing material was highly combustible, and caught fire. Efforts were made by the workers to extinguish the fire at its origin, but they apparently did not recognize that the fire, under the influence of the draft through the penetration, was spreading on the reactor building side of the wall. The extent of the fire in the cable spreading room was limited to a few feet from the penetration; however, the presence of the fire on the other side of the wall from the point of ignition was not recognized until significant damage to cables related to the control of Units 1 and 2 had occurred.

This later resulted in the Nuclear Regulatory Commission making significant additions to the standards for fire protection through the publication of 10CFR50.48 Appendix R. According to the Nuclear Information and Resource Service, the newly restarted Unit One does not comply with these standards. Unit Three was not affected by the accident. This event was pivotal not just for firestopping in the nuclear field, but also in commercial and industrial construction. While the nuclear field went to installations of silicone foam, a wider array of firestops became prevalent in non-nuclear construction.

In a 2005 analysis of significant nuclear safety occurrences in the US, the NRC concluded that the fire at Browns Ferry was the most likely (excluding the actual disaster at TMI) "precursor" incident to have led to a nuclear disaster in the event of a subsequent failure. [cite_web | author=Nuclear Regulatory Commission | title=NRC Commission Document SECY-05-0192 Attachment 2 | url=http://www.nrc.gov/reading-rm/doc-collections/commission/secys/2005/secy2005-0192/attachment2.pdf | accessdate=2008-01-28|format=PDF]

Unit Two

Unit Two is a 1,113 MWe BWR built by General Electric which originally came online on August 2 1974, and is licensed to operate through June 28 2034. Unit Two generated 8,911,261 Megawatthours of electricity in 2003, achieving a capacity factor of 94.1%.

Unit Two was temporarily shutdown on August 16, 2007 because the cooling water drawn from the Tennessee River was too hot. The water had been heated by a heatwave across the southeastern U.S. and the heated cooling water discharge from upstream plants.

Beginning in 2005 Unit 2 was loaded with BLEU (Blended Low Enriched Uranium) recovered by the DOE from weapons programs. This fuel contains quantities of U-236 and other contaminants because it was made from reprocessed fuel from weapons program reactors and therefore has slightly different characteristics when used in a reactor as compared to fresh Uranium fuel. By making use of this fuel which would otherwise have been disposed of as waste the TVA is saving millions of dollars in fuel costs and accumulating a database recycled uranium reactions in LWR use. [http://www.tva.gov/news/releases/octdec05/tva_bleu.htm TVA press release]

Unit Three

Unit Three is a 1,113 MWe BWR built by General Electric which originally came online on August 18 1976, and is licensed to operate through July 2, 2036. Unit Three generated 9,260,078 Megawatthours, achieving a capacity factor of 99%.

References

ee also

*Gregory Minor

External links

* [http://www.eia.doe.gov/cneaf/nuclear/page/at_a_glance/reactors/brownsferry.html DOE Browns Ferry Site]
* [http://www.tva.gov/ TVA Website]
* [http://www.ccnr.org/browns_ferry.html The Fire at the Brown's Ferry Nuclear Power Station] , by David Dinsmore Comey, 1976.
* [http://www.nirs.org/press/06-20-2007/1 NIRS Investigation Finds That "New" Browns Ferry-1 Reactor Still Doesn't Meet Fire Protection Regulations Its 1975 Fire Caused] Nuclear Information and Resource Service, June 20, 2007.
* [http://www.al.com/newsflash/regional/index.ssf?/base/news-30/1187315674106070.xml&storylist=alabamanews TVA reactor shut down; cooling water drawn from river too hot]
* [http://frwebgate3.access.gpo.gov/cgi-bin/waisgate.cgi?WAISdocID=1957518962+71+2+0&WAISaction=retrieve Reactor Fire Protection 10CFR50.48] , NRC Summary