Bruce Nuclear Generating Station
|Bruce Nuclear Generating Station|
Bruce B Nuclear Generating Station
|Location||Kincardine, Bruce County, Ontario|
|Construction cost||$14.4 billion CAD|
|Owner(s)||Ontario Power Generation (OPG)|
|Nuclear power station|
|Reactor type||CANDU, Advanced CANDU reactors proposed|
|Units operational||2 x 772 MW (A 1-2)
2 x 730 MW (A 3-4)
4 x 817 MW (B 1-4)
|Units decommissioned||1 (Douglas Point)|
|Nameplate capacity||6,232 MW|
|Annual generation||45,000 GWh|
Bruce Nuclear Generating Station is a Canadian nuclear power station located on the eastern shore of Lake Huron, in the communities of Inverhuron and Tiverton, Ontario. It occupies 932 ha (2300 acres) of land. The facility derives its name from Bruce County in which it is located, in the former Bruce Township. It is the largest nuclear generating station in the world by total reactor count, and number of operational reactors.
Formerly known as the Bruce Nuclear Power Development (BNPD), the facility was constructed in stages between 1970 and 1987 by the provincial Crown corporation, Ontario Hydro. In April 1999 Ontario Hydro was split into 5 component Crown corporations with Ontario Power Generation (OPG) taking over all electrical generating stations. In June 2000, OPG entered into a long term lease agreement with private sector consortium Bruce Power to take over operation of the Bruce station. In May 2001, Bruce Power began operations. The lease is for 18 years (until 2019) with an option to extend a further 25 years (to 2044).
The Bruce station is the largest nuclear facility in the world (the Kashiwazaki-Kariwa in Japan is larger but is only operating at 48% of capacity due to earthquake damage and decommissioning), comprising 8 CANDU nuclear reactors having a total output of 6,272 MW and 7,276 MW (net) when all units are online. The Bruce station has three double-circuit 500 kV transmission lines going out of it to feed the major load centres in southern Ontario, in addition to three double-circuit 230 kV lines serving the local area.
The station is the largest employer in Bruce County, with 3800 workers.
In November 2009, the Canadian Nuclear Safety Commission renewed Bruce Power’s operating licences for 5 years (until 2014), as well as giving permission to refuel units 1 and 2. In May 2014, the CNSC extended the license to May 2015. Public hearings are tentatively schedule for early 2015 in Ottawa and Kincardine.
- 1 Description
- 2 Refurbishment Bruce 1 and 2
- 3 Future Development
- 4 Other features on site
- 5 Security and Safety
- 6 See also
- 7 References
- 8 External links
The 8 reactors are arranged into two plants (A and B) of 4 reactors. Each reactor is within a reinforced concrete containment, with eight steam generators. The steam generators are 12m tall, and weigh 100 tonnes each. Reactors share fuelling machines which travel in a duct traversing the entire plant. The duct is cut through solid rock beneath the reactors, and doubles as part of the pressure relief system, connected to the vacuum building. Each reactor has its own turbine generator set, with one high pressure turbine and 3 low pressure turbines driving one generator. The turbine hall (about 400 m long) at each plant houses the four turbine generator sets. Cooling water is taken from Lake Huron. There is (originally) one control room per 4 reactors.
- BRUCE A 1
- plant construction begins 1969
- construction of Bruce-1 begins 1 June 1971 (Bruce-2 work started first)
- first criticality 17 December 1976
- in service 1 September 1977 (about 8 years to build)
- out of service December 1997 (after about 20 years);
- refurbished starting in December 2010 (idle 13 years)
- operation resumed in September 2012
- expected retirement 2043
- BRUCE A 2
- construction begins 1 December 1970
- first criticality 27 July 1976
- first electricity generated 4 September 1976
- in service 1 September 1977
- out of service October 1995 (after approx. 18 years)
- operation resumed October 2012 (after 17 years idle, unit is 42 years old)
- expected retirement 2043 (73 years after construction start)
- BRUCE A 3
- BRUCE A 4
Construction of Bruce A began in 1969, making it the successor to the Pickering A plant.
Bruce A units are rated at 750MW of electricity net, and 805MW gross. Another source gives the figures of 769 MW and 825 MW. Each reactor requires 6240 fuel bundles that weigh 22.5 kg each, or about 140 tonnes of fuel. There are 480 fuel channels per reactor, containing 13 bundles each. There is storage capacity for about 23000 bundles. About 16 bundles are discharged per reactor per day.
The Bruce A steam generators have a separate, horizontal steam drum (one steam drum common to four steam generators). This design had been dropped in most other plants at the time. Issues related to the (AECL requested) design of the tube supports caused repair and delay costs which exceeded the net worth of the builder Babcock & Wilcox Canada.
Bruce A reactors uses unique booster rods to control reactivity. Booster rods contain 93% uranium-235, and are inserted to overcome xenon poisoning. Bruce B and all other Ontario Hydro reactors use absorber rods called adjusters that are normally in and are removed to overcome xenon poisoning.
Bruce A demonstrated an "excellent" early operating history. Together with Pickering A, the eight units achieved an overall average capability factor of 83% over the initial five-year period. In 1982, Unit 3 set a (then) world record of 494 days of continuous operation. Bruce A was the most reliable multi-unit station in the world in 1984.
In 1982 Bruce-2 was temporarily shutdown due to a pressure tube leak. In 1986 a fuel channel failed in Bruce-2 while the reactor was shut down. Some of the fuel elements were swept into the moderator (calandria) and were difficult to remove. In 1986 maintenance workers accidentally left a protective lead blanket in the steam generator of Bruce A 2. By the time the mistake was discovered six years later, the blanket had melted, severely damaging the boiler. In 1990 a software error caused a fuelling machine error on Bruce-4, damaging a fuel channel. In 1993, reactor power was reduced to 60% until various LOCA scenarios could be addressed. Subsequently Bruce A units returned to 89% of rated power. At the time Bruce Power took the lease (2001), all Bruce A units were laid-up
- Bruce B 5
- Bruce B 6
- in service 14 September 1984
- (original) scheduled shutdown 2018 (approx 34 years old)
- planned refurbishment to begin 2024
- Bruce B 7
- in service 10 April 1986
- (original) scheduled shutdown 2015
- planned refurbishment to begin 2026
- Bruce B 8
- in service 22 May 1987
- (original) scheduled shutdown 2019
- planned refurbishment to begin 2028
The Bruce B plant stands somewhat to the south of the original Douglas Point and Bruce A plants. Construction began in 1977.
Bruce B units are slightly larger capacity: 817 MW net, 840 MW gross. The slightly higher value is attributed to an improved steam generator design, where the steam drum is integral to each steam generator in a "light bulb" arrangement, eliminating the horizontal cross-drum.
With the completion of Bruce B in 1987, Bruce was the largest nuclear site in the world.
In 1990, a nine-week "impairment" of the Bruce B containment system was created when a technician incorrectly set the calibration on radioactivity monitors.
By year, the station (A and B combined) produced the following amounts of electricity:
- 2001 20.5 terawatt hours (TWh);
- 2003 24.5 TWh;
- 2004 (planned) 34 TWh.
- 2007 35.47 TWh
- 2008 35.26 TWh
- 2013 45 TWh which is about 30% of Ontario's production.
In 2006, OPA proposed increasing transmission line capacity from the plant, at a cost of between $200–600 million, described as "the largest electricity transmission investment in Ontario in the last 20 years." The line was completed in June 2012, several months ahead of schedule. Over 700 towers were built for the 180 kilometre line to Milton. The project ranked 45th in Renew Canada's annual list.
In 2010, Bruce Power was paid approximately $60 million for contracted, but unused power.
Comparison with Pickering
- Compared to the previous Pickering station, the Bruce reactors have higher power output, achieved by: increasing the number of fuel channels, increasing the number of bundles per channel, and a change in the fuel bundle itself.
- At Bruce, the fuelling equipment is shared by the four reactors of each plant, while at Pickering each reactor has a fuelling machine.
- The Bruce fuelling machine and fuel channel end fitting design (mostly by CGE) is based on the NPD design. The Pickering design by AECL is based on Douglas Point.
- The design of the reactor buildings differs: Bruce uses a squarish "close-in" design, in which as much of the equipment as possible is arranged outside the main containment envelope for easier access during maintenance and emergencies. The steam generators penetrate the containment. The primary coolant pumps and primary piping systems are inside the containment enclosure, but the pump motors are outside containment and the drive shaft seals form the containment boundary. Pickering has round domes which enclose much of the secondary cooling equipment.
- The Pickering A system did not originally have a second independent shutdown system. The Bruce containment concept differs: the reactor's reactivity mechanism deck serves as a part of the containment boundary, is closer to the reactor, and more prone to damage in the event of an accident ("accidental physical disasembly"). The designers therefore foresaw the need for a second safety system to reduce the risk on an accident. Bruce received a second, fully independent Safety Shutdown System (SDS2) which uses a liquid neutron poison injection method.
- The Bruce system also has a high-pressure Emergency Coolant Injection System (ECIS).
- Each Bruce "4 pack" has its own Vacuum Building, while Pickering has one per eight reactors.
- At Pickering, the vacuum duct is closed by nonreturn valves, which would prevent flow of the steam/air mixture from the duct to a non-accident reactor unit following a LOCA. In the Bruce concept, there is no such non-return valve; the reactor buildings are all interconnected during normal operation.
- Bruce uses single-circuit heat transport system, while Pickering has two circuits.
- The first two reactor units of Pickering A originally used Zircaloy-2 pressure tubes. All subsequent CANDU units use a zirconium - 2.5% niobium alloy.
- Bruce uses a pressuriser to maintain coolant pressure, Pickering a different system.
- The Pickering design utilizes 12 small steam generators operated in groups of three. Steam generators can be individually valved out of the heat transport loop, as can the pumps. There are 16 pumps per reactor, with 4 being spare. At Bruce, the number of steam generators and coolant pumps was reduced (to 8 and 4 respectively, there are no spare pumps), thereby simplifying the piping. The Bruce system permits reactor power level to be adjusted more quickly and easily.
Bruce A was projected to cost $0.9 billion (1969), and actually cost $1.8 billion (1978), a 100% over-run. Bruce B was projected to cost $3.9 billion (1976), and actually cost $6 billion (1989) in "dollars of the year", a 150% over-run. These figures are better than for Pickering B or Darlington (at 350%).
Blackout of 2003
During the Northeast Blackout of 2003 three Bruce B units were able to continue running at 60% reactor power and at 0% grid electrical power. They were able to do so for hours, because they had steam bypass systems that were designed to de-couple the reactor output from the generator electrical output. The three units were reconnected to the grid within 5 hours.
The Bruce A and B stations were designed to operate through grid disturbances and to operate for at least 6 hours disconnected from the grid. Bruce A subsequently lost this capability due to safety concerns with the booster rod system.[dubious ] "Contrary to popular belief, the electrical generators of nuclear plants can follow the load demands of the electrical grid provided specific engineered systems to permit this mode of operation are included in the plant design."
Refurbishment Bruce 1 and 2
Retubing of Bruce A units was planned in 1992, although this was deferred, as Ontario Hydro had a surplus of generation at the time.
In late 2005, Bruce Power and the Government of Ontario committed to return units 1 and 2 to service, in order to help meet increasing energy demand in the province of Ontario. The project was originally estimated to cost $4.25 billion. It was determined that while Units 1&2 could have been restarted without refurbishment, it was believed to be economical advantageous to do so, since refurbishment would have been required shortly thereafter. The goal is to keep units 1&2 in service until 2043, 66 years after original commissioning.
The refurbishment required:
- Pressure tube and calandria tube replacement
- Steam generator replacement
- Shutdown System 2 (SDS2) enhancement
- upgrade of turbine control systems, replacing original analog controls with a DCS
- Significant other work and maintenance (for example, 30 transformers containing PCBs will be replaced).
A new fuel bundle design (Low Void Reactivity Fuel, LVRF) is being considered, which uses slightly enriched (1% U-235) fuel pellets, within a CANFLEX 43-element bundle (compared to the existing 37-element bundle).
In 2006 and 2007, the restart project was judged to be the largest infrastructure project in Canada by ReNew Canada magazine. Estimated cost for the project later grew to $5.25 billion when Bruce Power decided to replace all 480 fuel channels in Unit 4, which will extend its working life to 2036, in line with the other 3 units of Bruce A. In 2008, due to difficulties developing the necessary robotics, the estimated cost of restarting Units 1 and 2 was raised between $400 and $700 million. The project, however, remained on schedule.
The auditor general reviewed the refurbishment deal in 2007
In January 2010, up to 217 workers were potentially exposed to radiation during the refurbishment. 27 workers may have received 5 mSv, a level well below the level that can affect human health. (For context, 8000mSv is fatal, and 3-16 is the normal background radiation that people normally experience in a typical year.) Only one lab in Canada (at Chalk River ) was qualified to do the testing. Bruce Power had to seek permission to use alternative labs.
In 2011, it was reported that Unit1 and 2 refurbishment, originally scheduled for 2009, is now predicted to be in commercial operation in 2012. Cost is $3.8 billion so far; the final cost is expected to be $4.8 billion. The original 2005 estimate was $2.75 billion.
As of January 2011, fuel channel installation in Unit 2 was complete. The Canadian Nuclear Safety Commission gave the operator the green light to restart Unit 2 on 16 March 2012. However, the reactor was shut down the next day after a leak was discovered in the moderator system.
In September 2012, Unit 1 began generating power again.
On 16 October 2012, Unit 2 was connected to the provincial electricity grid for the first time in 17 years.
Final costs are estimated at $4.8 billion, up from an original estimate of $2.75 billion, and the project ran "far behind" schedule.
New station (cancelled)
As part of a plan submitted to the Ontario Energy Board for approval, the Ontario Power Authority recommended building a new nuclear power station consisting of at least two reactors. The leading candidate is AECL's Advanced CANDU Reactor. Environmental assessments are currently underway both at Bruce and at Ontario Power Generation's Darlington Nuclear Generating Station.
Ontario Long Term Energy Plan (LTEP) 2013
Ontario announced plans to refurbish six reactors at the Bruce plant. Refurbishment of Bruce A4 would begin in 2016. Other units would follow at intervals. Bruce Power estimates the refurbishment cost to be about $2 billion per unit, or $12 billion for six. The price of the power from these units is expected to be in the range of ~$60–$70 per MWh.
Other features on site
There are more than 56 kilometres of roads on site, and at least 25 major structures. The site has its own fire department, laundry and medical centre.
Encompassed by the Bruce site is the shut-down Douglas Point reactor, an earlier version of the CANDU design. Construction began in 1960; was operational in 1967; and was shut down in 1984. The present Bruce reactors each are roughly 4 times the capacity of the 200 MW Douglas Point unit.
Bruce Heavy Water Plant (BHWP)
At one time the Bruce Heavy Water Plant (BHWP) also occupied the site. Atomic Energy of Canada Limited contracted the Lummus Company of Canada Limited in 1969 to design and construct the first phase of the plant, while Ontario Hydro was responsible for commissioning and operating.
It was planned to consist of four sub-plants, A through D:
- A was in production in 1973, shutdown in 1984, and demolished in 1993;
- B was in production in 1979, partially shutdown in 1993, completely closed in 1997, and subsequently demolished;
- C was cancelled, and never built;
- D was 70% completed when cancelled, and subsequently demolished in 1995.
During its lifetime, BHWP produced 16,000 megagrams (Mg) of reactor grade heavy water. Capacity of each sub-plant was planned to be 800 Mg/annum. The plant size was approximately 960 m by 750 m. The heavy water was 99.75% pure. The production of a single pound of heavy water required 340,000 pounds of feed water.
Bruce Bulk Steam System (BBSS)
Steam from Bruce A could be diverted to the bulk steam system to provide energy for the production of Heavy Water (750 MW thermal), to heat buildings within the development (15 MW th), or to provide energy (72 MW th) for the adjacent Bruce Energy Centre (BEC). The BEC supported industries such as greenhouses and plastic manufacturers. As one of the largest bulk steam systems in the world, this system could produce 5,350 MW of medium-pressure process steam, and had over 6 km of piping. It was demolished by the end of 2006. Because of the requirement to provide steam, the Bruce A turbines are undersized relative to the reactor power.
The Bruce station area is also the site of OPG's Western Waste Management Facility (WWMF). The WWMF stores all the low and intermediate level nuclear waste from the operation of OPG's 20 nuclear reactors, including those leased to Bruce Power. As of 2009, there are 11 Low level storage buildings.
In addition, the WWMF provides dry fuel storage for the Bruce reactors. The Nuclear Waste Management Organization is presently seeking a separate site in Canada for a permanent repository for the used fuel from all of Canada's nuclear reactors.
OPG has proposed a Deep Geologic Repository (DGR) for the long-term management of this low-and-intermediate level waste, to be constructed on lands adjacent to WWMF. The proposed DGR would be about 680 metres below surface.
Inverhuron Provincial Park
While not part of the Bruce site proper, the nearby Inverhuron Provincial Park is owned by OPG and is on lease to the Ontario Ministry of Natural Resources. As a condition of the operating licence for Bruce Nuclear, OPG has retained a 914 m radius exclusion zone in the northwest corner of the park. The former park campground was phased out in 1976 because of safety concerns related to the manufacturing of heavy water. Since heavy water is no longer produced, the park campground was allowed to re-open.
The heated water released back into Lake Huron by the plant prevents the surrounding shoreline from freezing over during winter and attracts an inordinate concentration of lake fish, which in turn attracts droves of Bald Eagles wintering in the area. Numbers peak around late February to early March and it is not uncommon for visitors to observe several dozen eagles in and around the general vicinity of the plant at any given time during these months.
Security and Safety
No Canadian nuclear power plant was designed to withstand an aerial terrorist attack similar to 9/11; the CNSC has since established no-fly zones above plants.
The "transformed" post 9/11 security team is described as being larger than the police force of the city of Kingston, i.e. equivalent to the force of a city of 100,000. Force members are permitted to carry firearms, and have powers of arrest. The force possesses armoured vehicles, water craft, and the plant is now triple-fenced. In May 2008, the Bruce Nuclear Response Team (NRT) won the U.S. National SWAT Championship (USNSC), defeating 29 other teams from 4 countries, the first time a Canadian team won an international SWAT event. They won again in 2009, 2010, and 2011.
Post 9/11, tours of the plant area were discontinued, although there is a visitor centre outside of the site.
According to the Bruce County emergency plan, "The Municipality of Kincardine will coordinate the emergency response concerns of a nuclear emergency situation resulting from an accident at the Bruce Power Site in the Municipality of Kincardine.". Kincardine is required to maintain a warning system within 3 km of the plant, and has a network of 10 warning stations equipped with sirens and strobes.
A variety of radiation monitoring measures are in place. Milk samples from local farms are sampled weekly. Drinking water at treatment plants in Kincardine and Southampton is sampled twice daily, and tested weekly. Ground water is sampled from several surface water, shallow and deep well locations. Aquatic sediment and fish are analysed, as well as livestock feed, honey, eggs, fruits and vegetables.
- List of Canadian nuclear generating stations
- List of electrical generating stations in Canada
- List of largest power stations in the world
- Huron Wind
- Nuclear Power
- Pickering Nuclear Generating Station
- Darlington Nuclear Generating Station
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- Bruce Power -operates the plant
- Ontario Power Generation (OPG) -owns the site, operates WWMF
- Ontario Power Authority (OPA) -long term planning
- Nuclear Waste Management Organization (NWMO)
- Atomic Energy of Canada Limited (AECL) -involved with design, owns Douglas Point
- Canadian Nuclear Safety Commission (CNSC) -federal regulator
- Kincardine -host municipality