CERN Accelerating science

The purpose of this Safety Regulation is to define the principles governing the declaration and management, including the notification, classification, analysis and follow-up, of Safety Incidents at CERN with a view to mitigate their consequences, both immediate and long term, and to avoid re-occurrence through corrective actions and sharing of lessons learnt.

The object is to define safety alarms and to establish general rules for the installation, maintenance, disabling, and layout of safety alarm systems generating level 3 alarms. The EDH version of the disabling form is now mandatory.

Description of the two types of emergency stops (general and local emergency stops), definition of the buildings or areas to be equipped, and effects due to these emergency stops on power supplies or accelerators. Exceptions and rules for safety equipment.

The scope of this Safety Instruction is to describe operational procedures in response to accidents, to assure coordination of interventions, both at CERN and with outside emergency services as well as the transmission of information within CERN and in case of need to the Host States Authorities and media. The adopted procedures depend on the seriousness level assigned to the event.

In application of the "Safety Policy at CERN" document, this Code describes the proper administrative procedure to be followed in the event of a serious accident or incident (Fact-Finding Report, Accident Board, Committee of Enquiry).

To be completed in accordance with Safety Code A2 Rev. 3 (EDH).
If you do not have an EDH account and only in this case, please contact by email: accident-inventory-admins@cern.ch.

In some cases the regulatory framework of a certain domain can be exhaustive and challenging to implement. This document provides further interpretation on CERN safety requirements, related to evacuation procedure and principles on the French territory of the CERN site, as well as recommendations on best practices to be used on CERN sites.

In some cases the regulatory framework of a certain domain can be exhaustive and challenging to implement. This document provides further interpretation on CERN safety requirements, related to evacuation procedure and principles on the French territory of the CERN site, as well as recommendations on best practices to be used on CERN sites.--