Modification and Design Substantiation

Discrete, rapid-turnaround safety arguments for plant modifications and engineering changes using documentation-driven logic.

What we do

Plant modifications and engineering changes need a clear safety argument before work can proceed. We deliver focused substantiation that verifies the existing design data against applicable regulatory criteria and identifies the claims and evidence affected by the change.

Our work covers change categorisation, requirements and hazard impact, design intent, assumptions, supporting calculations supplied by the client, and the written safety justification. We work within the established change process and templates rather than adding a new layer of bureaucracy.

The delivery model is sized to the change. Routine modifications receive an efficient, repeatable review, while novel or higher-consequence changes receive senior technical attention and a clear route to acceptance.

Who this is for

Operating nuclear sites, decommissioning programmes, defence estates, design authorities and operators working under a permissioning regime.

Related frameworks

Licence Condition 22, Design substantiation arrangements, MoD safety management arrangements