What is it?

It is a nuclear site licence condition (LC 14) for licensees to implement adequate arrangements for the production and assessment of safety cases justifying safety during all phases of the installation lifecycle i.e., during design, construction, manufacture, commissioning, operation, and decommissioning.


Safety cases are living documentation, that can consist of a single submission or several hundred documents and which must be maintained throughout the lifetime of the installation. Once implemented, they must be regularly reviewed and updated to consider plant modifications, operating experience gained, changes to standards, guidance or regulatory expectation, or learning from external events.

A proportionate approach is applied to safety case development, based on the perceived risk associated with the plant or process in question or the potential consequences if the design or safety case is ill conceived or poorly implemented.


Each licensee develops their own safety management arrangements to define the principles and processes to be applied in the development of safety cases for their sites. The specifics of these principles and processes vary between licensees but are based on a common foundation, demonstrating that the radiological risk has been reduced As Low As Reasonably Practicable (ALARP).

Why is it important?

The primary purpose of the safety case is to ensure licensees understand the potential risks and the ways in which they can be managed.


The safety case is also the vehicle by which the licensee can demonstrate to the regulator that they are adequately managing the safety of their facilities and processes in accordance with their own arrangements and the requirements of their site licence.

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What do we do?

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Our team provides expert safety case support to new and existing facilities across the UK civil and defence sectors as well as internationally.


Our safety case specialists use a range of deterministic and probabilistic techniques to develop high quality safety submissions for our clients.


Our safety case capability includes:

Safety Case Authoring – modifications and new build plant


Independent Nuclear and Technical Assessment

Safety Case Strategy development

Hazard Identification and assessment

Fault and engineering schedule development

Optioneering and ALARP studies

Development of safety case standards, processes, guidance and training

Our safety case team work in close collaboration with our probablistic safety assessment and human factors teams to provide a fully integrated service unique within the UK nuclear sector.

Our Experience

Our team members have authored and verified safety case submissions at all safety significance levels for our clients (e.g. Safety Category 1, 2 and 3). Our experience includes:

Plant Modifications

New Build Safety Cases, including staged submissions (e.g. Preliminary, Pre-Construction, Pre-Commissioning and Pre -Operations Safety Reports).

Fault Studies and Fuel Safety Cases

Fuel Route Safety Cases

Return to Service Cases and Justifications for Continued Operation

Shutdown Safety Cases

Relicensing Safety Cases

Waste and Decommissioning Safety Cases

Supporting the production Generic Design Assessment (GDA) submissions

Expert support to the regulator

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