A minor change may result in a major accident even for spare part replacement.
The assessment of risks related to the permanent or temporary change constitutes a crucial step. The identification, analysis and classification of the risks permit to define the most appropriate prevention actions covering the technical, human and organizational dimensions. They have to be updated and regularly audited whenever there is a permanent or temporary change.
Any permanent or temporary technical, technological or organizational change as well assigning an employee to a critical position must be subject to a systematic risk assessment prior to the change authorization; the residual risks after the change must remain acceptable.
For any change, one must :