Office for Nuclear Regulation

Stress Tests

In the wake of events at Fukushima, on 24-25 March 2011 the European Council EC requested a review of safety at all European nuclear power plants (NPP) and the European Nuclear Safety Regulators Group (ENSREG) produced a specification and a plan for this review based on preliminary work carried out by the Western European Nuclear Regulators Association (WENRA). The reviews are commonly referred to as the 'stress tests'. Every nuclear power generating country in Europe agreed to carry out safety stress tests under request of the European Council. The tests, completed by licensees, involve a targeted reassessment of each stations safety margins in light of extreme natural events, such as earthquake and tsunami.

Given that the European Council stress tests only focus on NPPs HM Chief Inspector of Nuclear Installations decided to extend the stress test process to all other licensed nuclear installations within the UK.

On this page you will find the progress and the final reports for the UK nuclear power plants (NPP) and non power generating nuclear facilities (NPGNF) final report for UK nuclear power plants, submissions from licensees as well as details of an invitation to a public meeting.

Nuclear Power Plants

European Council Stress Tests for UK Nuclear Power Plants

The stress test can be summarised as the licensed nuclear installations targeted assessment of the relevant safety margins in light of the events which occurred at Fukushima: extreme natural events challenging the plant safety functions and leading to a severe accident.

Submissions from licensees

Rolls-Royce Marine Power Operations Ltd

Magnox Sites:

  • Chapel Cross
  • Dungeness A
  • Oldbury
  • Sizewell A
  • Wylfa

EDF Energy sites:

  • Dungeness B
  • Hartlepool
  • Hunterson B
  • Hinkey Point B
  • Heysham A
  • Heysham B
  • Torness
  • Sizewell B

Non Power Generating Nuclear Facilities (Non Nuclear Power Plants)

'Stress Tests' for UK Non Power Generating Nuclear Facilities

Submissions from licensees

Rolls-Royce Marine Power Operations Ltd

Magnox Ltd - defueled Reactors

  • Berkeley
  • Trawsfynydd
  • Hinkley Point A
  • Hunterston
  • Bradwell

Magnox Ltd - Defueling

  • Dungeness A
  • Sizewell A
  • Chapelcross

Magnox Ltd - Hot

  • Oldbury
  • Wylfa

EDF Energy NNB Generation Company Limited(NNB GenCo) - Hinkley Point C

Public meeting on the European stress tests & peer review process

Public meetings

Peer review report on EU stress tests

Following the events at Fukushima the European Council requested a comprehensive safety and risk assessment to be performed on all EU nuclear plants. The 'stress tests' were a three step process. The first step required all operators to perform an assessment and make proposals for safety improvements, following the ENSREG specifications. The second step was for national regulators to perform an independent review of the operators assessments and issue requirements where appropriate. This report represents the third step - a European peer review of all the national reports submitted by regulators.