EDF / 2018 Reference document

1.

PRESENTATION OF EDF GROUP Description of the Group's activities

In addition, every ten years, the stations are subject to a more detailed and wide ranging Periodic Safety Review (PSR) of design, operational and organisational safety which must also be accepted by the ONR in order to secure continued operation. In January 2017, the ONR accepted the Hinkley Point B and Hunterston B PSRs, and in January 2018 the ONR accepted for the Dungeness B PSR. ONR are currently assessing the Hartlepool and Heysham 1 PSR with acceptance due early 2019. Heysham 2 and Torness PSRs have been submitted for ONR assessment in 2019 with an ONR acceptance due in January 2020. 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. Seeking further lifetime extentions 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) is required. 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.

CURRENT OPERATING LIVES (1) AND CLOSURE DATES

Life Extensions (Already Formally Declared)

Scheduled Periodic Safety Reviews

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

Power Station Lifetime (Formally Declared)

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

–

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

CAPACITY AND OUTPUT BY POWER PLANT

Output (2) (TWh) 2018

Power (1) (MW)

Power plant

2017

AGR Power Plants Dungeness B

1,090 1,185 1,060 1,240

5.7 8.1 7.4 8.9 7.2 3.8 8.6

5.7 9.3 6.3 7.3 7.3 8.9

Hartlepool Heysham 1 Heysham 2

10.3

Hinkley Point B Hunterston B

965 985

Torness

1,200

PWR Power Plant Sizewell B

1,198 8,923

9.4

8.8

59.1 76%

63.9 82%

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.

Operational review of the existing nuclear generation fleet The nuclear generation fleet produced 59.1TWh during 2018, 4.8TWh less than 2017 (63.9TWh). The reduction in output is largely due to the extended outages at Hunterston B for graphite inspections and safety case work, the extended outages at Dungeness B to address the discovery of steam pipework cracking and corrosion on cooling water pipework and two additional statutory outages in 2018. Planned statutory outages were completed on Hartlepool Reactor 1, Heysham 1 Reactor 2, Heysham 2 Reactor 7, Hinkley Point B Reactor 4 and Torness Reactor 2. A planned statutory outage that was started at Sizewell B in 2017 was extended into 2018 to make repairs to the steam generators and was completed on 31 January 2018.

A statutory outage was started on Dungeness B Reactor 22 in August 2018 with an associated outage on Reactor 21 starting in September for work on common systems. These outages have been extended to address the discovery of steam pipework cracking and corrosion on cooling water pipework. The units are expected to return to service in Q2 2019. Hunterston B Reactor 3 was shut down for a scheduled graphite core inspection in March 2018. Following the discovery of new keyway root cracks in the reactor core at a slightly higher rate than modelled in the current safety case, EDF Energy took the decision to keep the reactor offline for further inspections and safety case work. A graphite core inspection on Hunterston B Reactor 4 planned for 2019 was also brought forward to October 2018. The units are expected to return to service in Q2 2019.

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I Reference Document 2018