EDF_REGISTRATION_DOCUMENT_2017

PRESENTATION OF EDF GROUP Description of the Group's activities

The AGRs were designed with a nominal 25 year lifetime, and Sizewell B with a 40 year lifetime. However, with the aggregation of technical information, and operational and safety experience, it has been possible to revise the expected AGR lifetimes. Prior to EDF Energy ownership, the AGRs had been extended by an average of 10 years, and it has been EDF Energy’s intention, where possible and economic, to seek further lifetime extensions. This may require additional investment in each plant, and requires technical, safety, and economic justifications to be made; and since it may result in increasing the nuclear liabilities, the consent of the Nuclear Decommissioning Authority (NDA).

Since British Energy was acquired by EDF, the AGRs have been further extended by an average of eight years. The last extensions were declared in February 2016. Hartlepool and Heysham 1 were extended by a further five years, and Heysham 2 and Torness were extended by seven years. Although the work has not yet been carried out to support the extension of Sizewell B, EDF Energy expects that it should be possible to extend it by c.20 years.

1.

CURRENT OPERATING LIVES (1) AND CLOSURE DATES:

Power Station Lifetime (Formally Declared)

Life Extensions (Already Formally Declared)

Associated Scheduled Closure Date

Type of reactor

Start of Generation Feb. 1976 Feb. 1976 Apr. 1983 Jul. 1983 Aug. 1983 May 1988 Jul. 1988 Feb. 1995

Scheduled Periodic Safety Reviews

Power Plant Hinkley Point B Hunterston B Dungeness B

AGR AGR AGR AGR AGR AGR AGR PWR

47 years 47 years 45 years 41 years 41 years 42 years 42 years 40 years

22 years 22 years 20 years 15 years 15 years 17 years 17 years

2023 2023 2028 2024 2024 2030 2030 2035

2017 2017 2018 2019 2019 2020 2020 2025

Heysham 1 Hartlepool

Torness

Heysham 2 Sizewell B

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As formally recorded by EDF Energy and approved by the NDA. (1)

CAPACITY AND OUTPUT BY POWER PLANT:

Output (2) (TWh)

Power Plant

Capacity (1) (MW)

2017

2016

AGR Power Plants Dungeness B

1,050 1,180 1,155 1,230

5.7 9.3 6.3 7.3 7.3 8.9

7.7 6.6 7.6 9.6 7.2 7.9 9.9

Hartlepool Heysham 1 Heysham 2

10.3

Hinkley Point B Hunterston B

955 965

Torness

1,185

PWR Power Plan t Sizewell B

1,198 8,918

8.8

8.6

63.9 82%

65.1 83%

TOTAL

LOAD FACTOR (3)

Capacities are stated net of all power consumed for the power stations’ own use, including power imported from the Grid. (1) Output in each year reflects any refuelling, planned and unplanned outages. (2) Load factors are obtained by dividing the actual output by the output that would have been achieved by each power plant operated at its stated capacity (3) appropriate for the period.

Planned statutory outages were completed on Dungeness B Reactor 21, Heysham 1 Reactor 1, Hunterston B Reactor 4, and Torness Reactor 1. A planned statutory outage was started at Sizewell B and Unit 2 returned on 31 January 2018 and Unit 1 returned on 1 February 2018. The outage was extended to make repairs to the steam generators. Radioactive Waste Management In the UK, radioactive waste is classified into four categories: low Level Waste (LLW), for which a near surface disposal route exists – including ■ the LLW Repository at Drigg West Cumbria; intermediate Level Waste (ILW), for which no disposal route is currently available ■ in the UK;

Operational review of the existing nuclear generation fleet

The nuclear generation fleet produced 63.9TWh during 2017, 1.2TWh less than 2016 (65.1TWh). The reduction in output is largely due to an additional statutory outage in 2017, two more reactor core inspection outages at Hinkley Point B and Hunterston B, higher unplanned losses and one less day of generation (2016 being a leap year), offset by fewer off-load refuellers and the first full year of seven out of eight boiler operation at Heysham 1 Reactor 1 since its load was constrained, following the discovery of a defect in a boiler spine in 2014. The 2017 output is the second highest since Hinkley Point B and Hunterston B were derated in 2006. In addition, the load factor, which through revision of station capacities takes account of these deratings, was 82%, the second best performance over the lifetime of the fleet.

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DF I Reference Document 2017