Bradwell had two Magnox-design reactors with a design output of 300MW of net electrical output, although this was reduced to 242MW net electrical in total[2] as a result of the discovery of breakaway oxidation of mild-steel components inside the reactor vessel. The reactors were supplied by The Nuclear Power Group (TNPG), and the nine turbines and 12 gas circulators by C. A. Parsons & Co.[3] (six of 52MW main turbines supplying power to the grid, three of 22.5MW auxiliaries turbines, one for each reactor for driving the gas circulators, with one standby auxiliary turbine). Steam pressure and temperature at the turbine stop valves was 730 psi (50 bar) and 371 °C (700 °F).[4]
Bradwell's peak output, achieved in the early 1960s, was nearly 10% above the design value. On a typical day it could supply enough electricity to meet the needs of towns the size of Chelmsford, Colchester and Southend.
Location
Bradwell was built on the edge of RAF Bradwell Bay, a former World War II airfield, 1.5 miles (2.4 km) from the Essex coastline. Its location was deliberately chosen, as the land had minimal agricultural value, offered easy access, was geologically sound and had an unlimited source of cooling water from the North Sea.
Nuclear fuel for Bradwell was delivered and removed via the nearest railhead, a loading facility adjacent to Southminster railway station on the Crouch Valley line. This included a dedicated siding and a gantry crane.[5]
In 1969, a new Honeywell 316 was installed as the primary reactor temperature-monitoring computer; this was in continuous use until summer 2000, when the internal 160kB disk failed. Two PDP-11/70s, which had previously been secondary monitors, were moved to primary.[citation needed]
Electricity output
Electricity output from Bradwell power station over the period 1964–1984 was as follows.[4][6]
Bradwell annual electricity output GWh.
Graphs are unavailable due to technical issues. Updates on reimplementing the Graph extension, which will be known as the Chart extension, can be found on Phabricator and on MediaWiki.org.
Decommissioning
In 1999, it was announced that the station would cease operation in 2002 – the first UK station to be closed on a planned basis. On 28 March 2002, Lord Braybrooke, Lord Lieutenant of Essex, unveiled a plaque to mark the cessation of electricity generation and the beginning of the decommissioning stage.[7]
Decommissioning is being carried out by Nuclear Decommissioning Authority (NDA) subsidiary Magnox Ltd.
All spent nuclear fuel was removed from the site by 2005, the turbine hall was demolished in 2011, and by 2016 underground waste storage vaults had been emptied and decontaminated.[8]
Demolition of all buildings except the ponds and two reactor buildings was completed in 2019. Demolition of the reactor buildings and final site clearance is planned for 2083 to 2093.[9]
In 2007, Bradwell became one of the sites being considered by British Energy for redevelopment in a new round of nuclear reactors.[10]
On 18 October 2010, the British government announced that Bradwell was one of the eight sites it considered suitable for future nuclear power stations.[11]
On 21 September 2015, Energy Secretary Amber Rudd announced that "China was expected to lead the construction of a Beijing-designed nuclear station at the (Bradwell) Essex site".[13][14] EDF's chief executive Jean-Bernard Lévy stated that the reactor design under consideration is the Hualong One.[15]
On 21 October 2015, it was reported that Britain and China had reached Strategic Investment Agreements for three nuclear power plants, including one at Bradwell.[16]
On 19 January 2017, the Office for Nuclear Regulation started their Generic Design Assessment process for the Hualong One design, expected to be completed in 2021, in advance of possible deployment at Bradwell.[17] The target commercial operation date is about 2030.[18]
The press have raised concerns about Chinese government involvement in the project.[19] The China General Nuclear Power Group,[20][21] specified as a designer and operator of the plant, is blacklisted by the United States Department of Commerce for attempting to acquire advanced U.S. nuclear technology and material for diversion to military use.[22][23]
Safety record
In 1966, 20 natural uranium fuel rods were stolen from Bradwell.[24] The rods were stolen for their perceived scrap value by Harold Arthur Sneath, a worker at the plant. The theft was discovered by the local police when a van driven by Dennis Patrick Hadley, who was transporting the rods to their final destination, was stopped because of its defective steering. The rods were recovered and, in the subsequent court case, Sneath and Hadley were bound over for five years, each fined £100, and were required to contribute to the costs of the court case. Neither was said to have understood the consequences of the theft.[25]
On 22 January 2011, a fire broke out during the decommissioning work as condenser tubes made from titanium were being cut up. No radiation was released from this fire.[26]
In literature
The construction of the original power station is the subject of the Michael Morpurgo story Homecoming.[27]
