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Hinkley Point B Nuclear Power Station

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Title: Hinkley Point B Nuclear Power Station  
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Subject: Nuclear power in the United Kingdom, Heysham nuclear power station, Hinkley Point A nuclear power station, River Parrett, Bridgwater College
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Hinkley Point B Nuclear Power Station

Hinkley Point B nuclear power station
Hinkley Point B seen from the beach
Country England
Location Somerset, South West England
Status Operational
Construction began 1967
Commission date 1976
Decommission date Expected 2023
Owner(s) Central Electricity Generating Board
Nuclear Electric
British Energy
EDF Energy
Operator(s) EDF Energy
Nuclear power station
Reactor type Advanced gas cooled reactor
Reactor supplier The Nuclear Power Group
Power generation
Primary fuel Nuclear
Units operational 2 x 625 MWe (Operating at ~490 MWe [1] )
Nameplate capacity 1250 MWe
grid reference ST211460

Hinkley Point B is a nuclear power station near Bridgwater, Somerset, on the Bristol Channel coast of south west England.


The construction of Hinkley Point B, which was undertaken by a consortium known as The Nuclear Power Group (TNPG),[2] started in 1967. The reactors were supplied by TNPG and the turbines by GEC.[3] Hinkley Point B is an Advanced Gas-cooled Reactor (AGR) which was designed to generate 1250 MW of electricity (MWe).

In March 1971 it was announced that there would be a six-month delay in completion due to problems with the insulation of the concrete pressure vessel. In place of the stainless steel mesh and foil insulation that had been used on previous Magnox stations, a fibrous type of insulation supplied by Delaney Gallay, part of the Lindustries Group, had been used for the first time. During pre-operational trials, before the nuclear fuel was loaded, high levels of acoustic vibration in the gas circuit were found to be damaging the insulation tiles, and the retention plates which held the insulation in place had to be redesigned and modified within the reactor.[4]

During further pre-operational testing, severe vibration of the fuel channel gags was detected. The fuel channel gags are valves which are gradually closed to restrict the flow of gas through a fuel channel in order to maintain the channel gas outlet temperature as the nuclear fuel is used up. Modifications to produce a fluidically generated bias force to stop the gags vibrating took time to design, test and implement, delaying the planned start up date.[5] The station began generating electricity on 5 February 1976.

It was taken over by Nuclear Electric as part of the privatisation of the UK Electricity Supply Industry in 1989, though remaining in public ownership at that time. In 1996, the AGR and PWR assets of Nuclear Electric and Scottish Nuclear were privatised as part of British Energy.

In 2006 the station's reactors were closed for testing microscopic defects that had been found in similar reactors. While it was implied in the media that these were major holes gushing steam, had this been the case the loss of pressure would lead to an automatic shut down to prevent damage. Due to its age, on 16 August 2006 the company warned that until a decision was made over whether to extend its usable life it would operate at a maximum of 70 per cent load. Both reactors were subsequently restarted generating 420 MW each, roughly 70% of full capacity. The number 4 reactor was cleared for restart by the Nuclear Installations Inspectorate on 11 May 2007. [6] The power station current accounting closure date in 2023.[7]

Hinkley Point B is the only one of four nuclear power stations in the area which is operational, the others being decommissioned are the adjacent Hinkley Point A together with Oldbury and Berkeley on the banks of the River Severn. As of 2013 it provided 1% of the UK's total power output.[8]

A new 3,260 MW Hinkley Point C nuclear power station was given planning consent on 19 March 2013. [9] A guaranteed "strike price" of £92.50 per megawatt-hour (to be indexed for inflation over 45 years) was announced on 21 October 2013. The new power station would see Hinkley's contribution to the country's power supply rise to 7%.[8] At the time of the planning consent, the price for electric energy on the wholesale market was around £45 per megawatt-hour while the new power plant was expected to need earnings of £90 per megawatt-hour in order to break even.[10]

See also


  1. ^ "Hinkley Point B EDF Energy". Retrieved 14 Oct 2014. 
  2. ^ "Nuclear Development in the United Kingdom". World Nuclear Association. Retrieved 28 December 2013. 
  3. ^ "Nuclear Power Plants in the UK". Retrieved 2013-10-20. 
  4. ^ The Times, Tuesday, 30 Mar 1971
  5. ^ The Times, Thursday, 13 Feb 1975
  6. ^ "Nuclear plant gets nod to restart". BBC. 11 May 2007. Retrieved 2007-05-31. 
  7. ^ This website was built by the EDF Energy WCM (2012-12-04). "EDF Energy announces seven year life extension to Hinkley Point B and Hunterston B nuclear power stations - EDF Energy 4 December 2012". Retrieved 2013-10-20. 
  8. ^ a b "UK nuclear power plant set for go-ahead". 2013-10-13. Retrieved 2013-10-20. 
  9. ^ Dave Harvey (19 March 2013). "What price nuclear power? The final hurdle for Hinkley". BBC. Retrieved 19 March 2013. 
  10. ^ What price nuclear power? The final hurdle for Hinkley BBC, 19 March 2013.
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