Written by:
HSE Department
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The CERN Safety Rules listed below have been published on the dedicated CERN website:
- Safety Regulation SR-M, “Mechanical Equipment” (revised version,) EDMS 875606
- General Safety Instruction GSI-M-2, “Pressure Equipment” (revised version), EDMS 875610
- General Safety Instruction GSI-M-4, “Cryogenic Equipment” (revised version), EDMS 1327191
- Specific Safety Instruction SSI-M-2-1, “Pressure Vessels” (revised version), EDMS 1453950
- Specific Safety Instruction SSI-M-2-2, “Simple Pressure Vessels” (revised version), EDMS 1453952
- Safety Guideline SG-M-2-1-1, “Risk Based Inspection (RBI) Evaluation for Pressure Equipment”(new), EDMS 3516247
Prompted by the introduction of a new risk-based inspection concept, the above Safety Rules have been updated to take account of changes in EU directives and evolutions in the definitions and concepts used in CERN’s Safety Rules, and to replace the Major Safety Implication (MSI) approach with the now standard approach of authorising deviations from Safety Rules’ provisions on the basis of satisfactory risk assessment and mitigation.
Any questions regarding the Safety Rules can be addressed to Safety-Rules.Secretariat@cern.ch
The CERN Safety Rules apply to all persons under the Director General’s authority. They are available at the following link: http://www.cern.ch/safety-rules
Facts Only
Safety Regulation SR-M, “Mechanical Equipment” was revised and is documented in EDMS 875606.
General Safety Instruction GSI-M-2, “Pressure Equipment” was revised and is documented in EDMS 875610.
General Safety Instruction GSI-M-4, “Cryogenic Equipment” was revised and is documented in EDMS 1327191.
Specific Safety Instruction SSI-M-2-1, “Pressure Vessels” was revised and is documented in EDMS 1453950.
Specific Safety Instruction SSI-M-2-2, “Simple Pressure Vessels” was revised and is documented in EDMS 1453952.
Safety Guideline SG-M-2-1-1, “Risk Based Inspection (RBI) Evaluation for Pressure Equipment” was newly introduced in EDMS 3516247.
The updates incorporate changes from EU directives and evolutions in CERN's Safety Rules definitions.
The standard for authorizing deviations is based on satisfactory risk assessment and mitigation, replacing the Major Safety Implication (MSI) approach.
Information regarding the Safety Rules is available at http://www.cern.ch/safety-rules
Executive Summary
Full Take
The shift from a Major Safety Implication (MSI) framework to one based on risk assessment and mitigation represents a significant epistemological pivot in safety governance. This move suggests an institutional recognition that static, high-level categorization of risk may be insufficient for managing complex technological evolution; instead, the focus shifts to dynamic, context-dependent evaluation. The introduction of Risk-Based Inspection (RBI) as a new guideline demonstrates an attempt to formalize decision-making around residual risk rather than binary compliance checks. This operational change implies that the definition and application of safety are moving from prescriptive adherence to performance-based accountability.
The pattern observed is an institutional drive toward procedural maturity, where evolving external mandates (EU directives) necessitate an internal restructuring of established protocols. The implication for agency is whether this transition successfully empowers operational teams by providing more flexible, risk-informed decision space, or if the implementation introduces new layers of bureaucratic complexity in assessing and documenting these novel risk-based deviations. What specific mechanisms are being put in place to ensure that "satisfactory risk assessment and mitigation" remains an objective, non-negotiable standard across different operational contexts?
Sentinel — Human
This text reads like an official administrative notification detailing the publication of updated safety rules, strongly suggesting human authorship from an official source.