Vogtle Electric Generating Plant
Location of Plant Vogtle in Georgia (U.S. state)
|Official name||Alvin W. Vogtle Electric Generating Plant|
|Location||Burke County, Georgia,|
|Coordinates||33°8′36″N 81°45′38″W / 33.14333°N 81.76056°WCoordinates: 33°8′36″N 81°45′38″W / 33.14333°N 81.76056°W|
Unit 1: June 1, 1987 |
Unit 2: May 20, 1989
|Construction cost||$8.87 billion (Units 1 & 2)|
Georgia Power (45.7%)|
City of Dalton (1.6%)
|Nuclear power station|
|Reactor type||4-loop PWR (active), AP1000 (in construction)|
|Cooling source||Savannah River|
|Cooling towers||4 (two in construction)|
|Units operational||2 × 1215 MW|
|Make and model||
(Units 1 & 2)
|Units under const.||2 × 1117 MW|
|Average generation||18,297 GW·h|
Plant Vogtle — Southern Nuclear
The Alvin W. Vogtle Electric Generating Plant, also known as Plant Vogtle, is a 2-unit nuclear power plant located in Burke County, near Waynesboro, Georgia, in the southeastern United States. It is named after the Alabama Power and Southern Company board chairman, Alvin Vogtle.
Each unit has a Westinghouse pressurized water reactor (PWR), with a General Electric steam turbine and electric generator. Units 1 and 2 were completed in 1987 and 1989, respectively. Each unit is capable of producing approximately 1,200 MW of electricity when online, for a combined capacity of 2,400 MW. Southern Nuclear lists the capacity as 1,215 MW each, for a combined output of 2,430 MW. The twin natural-draft cooling towers are 548 ft (167 m) tall and provide cooling to the plant's main condensers. Four smaller mechanical draft cooling towers provide service water cooling to auxiliary safety and non safety components and remove the decay heat from the reactor when the plant is offline. One natural-draft tower and two service water towers serve each unit. In 2009, the NRC renewed the licenses for both units for an additional 20 years, to the 2040s.
Construction of two additional AP1000 reactors (3 and 4) are underway. Natural-draft type cooling towers were also selected and the two new cooling towers will also be nearly 550 feet tall. The certified construction & capital costs for these two new units were originally 4,418 million which escalated to an estimated $5,045 million according to the Twelfth Semi-annual Vogtle Construction Monitoring Report. This last report blames the latest increase of costs to Contractor not completing work as scheduled. Though the utility suffered some of the cost increases resulting from the delay, protections in the EPC (Engineering, Procurement, Construction) agreement largely insulate the utility from these cost increases. Upon completion of units 3 and 4, Vogtle will become the largest nuclear station in the United States and one of the largest power plants of any fuel type nationwide in terms of annual energy output.
The Nuclear Regulatory Commission defines two emergency planning zones around nuclear power plants: a plume exposure pathway zone with a radius of 10 miles (16 km), concerned primarily with exposure to, and inhalation of, airborne radioactive contamination, and an ingestion pathway zone of about 50 miles (80 km), concerned primarily with ingestion of food and liquid contaminated by radioactivity.
The 2010 U.S. population within 10 miles (16 km) of Vogtle was 5,845, a decrease of 16.3 percent in a decade, according to an analysis of U.S. Census data for msnbc.com. The 2010 U.S. population within 50 miles (80 km) was 726,640, an increase of 8.8 percent since 2000. Cities within 50 miles include Augusta (26 miles to city center).
The Nuclear Regulatory Commission's estimate of the risk each year of an earthquake intense enough to cause core damage to the reactor at Vogtle was 1 in 140,845, according to an NRC study published in August 2010.
In 2008, both reactors were increased in power by 1.7% by an "Appendix K" uprate, also called a Measurement Uncertainty Recapture uprate. "Measurement uncertainty recapture power uprates are less than 2 percent and are achieved by implementing enhanced techniques for calculating reactor power. This involves the use of state-of-the-art feedwater flow measurement devices to more precisely measure feedwater flow, which is used to calculate reactor power. More precise measurements reduce the degree of uncertainty in the power level, which is used by analysts to predict the ability of the reactor to be safely shut down under postulated accident conditions." Because the reactor power can be calculated with much greater accuracy now than with the old venturi type measurement, the plant can safely run within a tighter margin of error to their limit. The new flow meter works by comparing the time it takes ultrasonic sound pulses to travel upstream versus downstream inside the pipe, and uses that time difference to figure the flow rate of the water in the pipe.
The NRC approved Vogtle's License Amendment Request (LAR) in March 2008. "The NRC staff determined that Southern Nuclear could safely increase the reactor’s output primarily through more accurate means of measuring feedwater flow. NRC staff also reviewed Southern Nuclear’s evaluations showing the plant’s design can handle the increased power level." Unit 1 was uprated during its spring 2008 defueling outage, and Unit 2 was uprated in the fall outage of the same year.
Site area emergency
On March 20, 1990 at 9:20 a.m., a truck carrying fuel and lubricants in the plant's 230kv low voltage switchyard backed into a support column for the feeder line supplying power to the Unit 1-A reserve auxiliary transformer (RAT). At the time, the 1-B RAT was de-energized for maintenance and RAT 1-A was powering both trains of emergency electrical power, and the non-emergency electrical trains were being powered by back-feeding from the switchyard through the main step-up transformer to the 1-A and 1-B unit auxiliary transformers (UAT.) Additionally, Emergency Diesel Generator (EDG) 1-B was out of service for planned maintenance. After the power loss, EDG 1-A failed to start due to a protective safety trip. The resulting loss of electrical power in the plant's "vital circuits" shut down the residual heat removal (RHR) pump that was cooling Unit 1 (which was nearing the end of a refueling outage) and prevented the back-up RHR from activating. Even though Unit 1 was offline at the time, residual heat from the natural decay of the radioactive fuel needed to be removed to prevent a dangerous rise in core temperature. While the non safety power was not interrupted, there was no physical connection between the vital and non-vital electrical trains which prevented the vital trains from receiving power from the unaffected path through the UATs.
At 9:40 a.m., the plant operators declared a site area emergency (SAE) per existing procedures which called for an SAE whenever "vital" power is lost for more than 15 minutes. At 9:56 a.m., after trying multiple times to start the "A" EDG normally, plant operators performed an emergency startup of the EDG by activating the generator's "emergency start" break-glass which bypassed most of the EDG's safeties and forced it to start. The startup was successful. RHR-A was then started using power from EDG-A. With core cooling restored, the SAE was downgraded to an alert at 10:15 a.m. At 11:40 a.m., crews energized RAT 1-B which had been shut down for maintenance and restored power to the "B" safety electrical train. At 12:57 p.m., the "A" safety train was switched from the EDG to RAT 1-B and the EDG was shut down. With both trains receiving offsite power, the alert was terminated at 1:47 p.m.
The temperature of the Unit 1 core coolant increased from 90 °F to 136 °F during the 36 minutes required to re-energize the A-side bus. Throughout the event, non-vital power was continuously available to Unit 1 from off-site sources. However, the Vogtle electrical system was not designed to permit easy interconnection of the Unit 1 vital busses to non-vital power or to the Unit 2 electrical busses. Since this incident, Plant Vogtle has implemented changes to the plant that allow the non-vital electrical buses to transfer power to the vital buses in this type of scenario.
The electrical fault described above also affected unit 2 by causing breakers in the 230kv switchyard to trip cutting off power to RAT 2-B and vital bus B on unit 2. EDG 2-B subsequently started and restored power to the vital bus. At the same time, the electrical disturbance from the falling line striking the ground was detected by protective safeties on unit 2's main step-up transformer and a protective relay actuated and opened the transformer's output breaker causing a full load rejection to unit 2 which led to a turbine trip and reactor scram. After the unit tripped, the B non-vital electrical train lost power as it attempted to transfer from UAT 2-B (which is powered by the turbine generator) to the failed RAT 2-B causing two of the reactor coolant pumps and one of the main feedwater pumps to trip, though the plant cool down proceeded safely. At 9:03 p.m., the RAT 2-B breakers in the switchyard were reset and offsite power was restored to the vital and non-vital B electrical trains allowing reactor coolant pumps 2 and 4 to be restarted. EDG 2-B was shutdown. It was later determined that the fault disturbance caused by the line falling was not of significant magnitude to trip the protective relay per design and should not have caused unit 2 to shut down. Further investigation found that current transformers on the main transformer were improperly set. The controls were adjusted to the proper setting. Had the CTs been properly set initially, the unit would have remained online.
Units 3 and 4
|Wikinews has related news: US regulators approve new nuclear reactors for first time in 34 years|
On August 15, 2006, Southern Nuclear formally applied for an Early Site Permit (ESP) for two additional units. The ESP determined whether the site was appropriate for additional reactors, and this process is separate from the Combined Construction and Operating License (COL) application process. On March 31, 2008, Southern Nuclear announced that it had submitted an application for a COL, a process which will take at least 3 to 4 years. On April 9, 2008, Georgia Power Company reached a contract agreement for two AP1000 reactors designed by Westinghouse which is owned by Toshiba and the Shaw Group (Baton Rouge, LA). The contract represents the first agreement for new nuclear development in the US since the Three Mile Island accident in 1979, and received approval from the Georgia Public Service Commission on March 17, 2009. As stated by a Georgia Power spokesperson Carol Boatright: "If the PSC approves, we are going forward with the new units."
On August 26, 2009, the Nuclear Regulatory Commission (NRC) issued an Early Site Permit and a Limited Work Authorization. Limited construction at the new reactor sites began, with Unit 3 then expected to be operational in 2016, followed by Unit 4 in 2017, pending final issuance of the Combined Construction and Operating License by the NRC. These dates have since slipped to 2019 and 2020.
On February 16, 2010, President Obama announced $8.33 billion in federal loan guarantees toward the construction cost, although as of December 2013 Georgia Power had not availed itself of those guarantees. The expected building cost for the two reactors is $14 billion. Georgia power's share is around $6.1 billion, while "remaining ownership of the two reactors is split among Oglethorpe Power Corp., the Municipal Electric Authority of Georgia (MEAG Power), and Dalton Utilities".
In February 2012, the NRC approved the construction license of the two proposed AP1000 reactors at the Vogtle plant. NRC Chairman Gregory Jaczko cast the lone dissenting vote on plans to build and operate the two new nuclear power reactors, citing safety concerns stemming from Japan's 2011 Fukushima nuclear disaster, and saying "I cannot support issuing this license as if Fukushima never happened". One week after Southern received the license to begin construction, a dozen environmental and anti-nuclear groups sued to stop the expansion project, saying "public safety and environmental problems since Japan's Fukushima Daiichi nuclear reactor accident have not been taken into account". On July 11, 2012, the lawsuit was rejected by the Washington D.C. Circuit Court of Appeals.
On March 12, 2013 construction on unit 3 officially began with the pour of the basemat concrete for the nuclear island. This operation was complete on March 14. During the weekend of June 1–2, 2013, assembly of the containment vessel began with the bottom head of the vessel being lifted into place on the nuclear island. By June 2013, construction schedule had been extended by at least 14 months. On November 21, 2013, the basemat pour for Unit 4 was completed.
In February 2014, the Department of Energy approved a $6.5 billion loan guarantee for Southern Co. subsidiary Georgia Power and Oglethorpe Power Corp. The Department of Energy initially demanded a credit subsidy fee, but the demand was ultimately dropped given the financial strength of Southern Co. and the Vogtle project. Even though the waiver of the credit subsidy fee benefits Georgia rate-payers, several anti-nuclear groups are critical of the loan guarantee. In a similar case Constellation Energy was asked to pay a credit subsidy fee of hundreds of millions of dollars when it applied to build a nuclear plant in Maryland. The company refused and ultimately cancelled the project.
Recent construction milestones include the setting of the final of the "big six" structural modules for Unit 3 the CA-02 and CA-03 which form the walls of a storage tank that is part of the reactor's passive cooling systems. The big 6 modules also include the previously installed CA-01, CA-04, and CA-05 in-containment structural modules and the previously installed CA-20 structural module which forms part of the internal structure of the auxiliary building and contains many of the reactor's support systems. CA-02 and CA-03 were placed within the containment vessel during May 2016. The setting of these modules is a fairly significant milestone and allows other construction activities to commence that could not until the modules were in place. It was also announced that the cooling tower of unit 4 is nearing completion. In June the final reactor coolant pump for Unit 3 was received on site.
The Vogtle Electric Generating Plant consists of two operational reactors; two additional units are under construction.
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|Wikimedia Commons has media related to Vogtle Electric Generating Plant.|
- Southern Nuclear: Plant Vogtle Homepage
- U.S. Department of Energy: Vogtle
- NRC: Vogtle Electric Generating Plant, Unit 1
- NRC: Vogtle Electric Generating Plant, Unit 2
- NRC: Vogtle, Units 3 & 4 Application