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Featured countriesAll countries We hold legislation content for {u}: duties, deadlines and the documents they produce. For {u} we have measured content in specific areas — today the construction health and safety plan — and the basic framework is {k}. A full obligation register for this country does not exist yet; for everything else you will continue with country-independent content. In {u} the base framework is {k}. We do not yet hold country-specific duty content; you will continue with method and standard content. We do not yet hold legislation content for {u}. You will continue with country-independent content: methods, management system standards and internationally accepted practice.Seveso III — control of major accident hazards
It binds establishments in the European Union that exceed the dangerous substance thresholds. The thresholds are identical to the Turkish regulation (measured).
What it asks for
The directive defines two tiers. The lower tier triggers notification, a major-accident prevention policy and public information; the upper tier adds a safety report, an internal emergency plan and an input to land-use planning. Establishments close to one another are handled under domino effects.
- Scope and tierLower or upper tier is determined from the Annex I thresholds and the summation rule.
- NotificationSubstances and quantities are notified to the competent authority.
- Prevention policyA major-accident prevention policy is prepared and implemented.
- Safety reportAt upper tier a report with scenarios, consequences and measures is submitted.
- Internal plan and drillsAn emergency plan is prepared and tested by regular drills.
- Domino effects and land useInformation is shared with neighbouring establishments and fed into planning decisions.
Because the thresholds match the Turkish regulation, the same calculation engine serves both regimes; what changes is the name of the documents and the authority they go to.
Which modules cover it
The modules below hold the records for this topic. Which ones you switch on is your decision.
Major accident (Seveso)
Establishment tier, substance inventory and notification documents.
Explosion protection document
Zones, the zone file, the 14-section document and equipment suitability.
Emergency management
Scenarios, team assignments and drill records.
Incident and non-conformity
Near miss, unsafe condition, work accident and occupational disease records.
Free tools for this topic
Legal basis
The table shows the obligations of the legislation region you pick in the top bar; it refreshes without reloading the page when the region changes.
Legal basis — Türkiye
| Obligation | Legal basis | How the page covers it |
|---|---|---|
| The operator determines the tier of the establishment by applying the summation rule defined in item 4 of the Notes to Annex 1. | Regulation on the Prevention of Major Industrial Accidents, Art. 7(1) | The scope and tier step on the page: the lower or upper tier is set with the Annex I thresholds and the summation rule. The page's own measurement states that the thresholds are identical to the Turkish regulation. |
| The operator of a lower or upper tier establishment files the notification before starting operation, accurately and completely, through the notification system by way of declaration. | Regulation on the Prevention of Major Industrial Accidents, Art. 7(2) | The notification step on the page; in the page's own words what changes is the name of the resulting documents and the authority they go to. |
| The operator of a lower tier establishment prepares or has prepared the major accident prevention policy document, taking account of the safety management system set out in Annex 3. | Regulation on the Prevention of Major Industrial Accidents, Art. 10(1) | The prevention policy step on the page. |
| The operator of an upper tier establishment prepares or has prepared a safety report containing at least the information set out in Annex 2 and keeps it at the establishment. | Regulation on the Prevention of Major Industrial Accidents, Art. 11(1) | The safety report step on the page. |
| The operator reviews the internal emergency plan at intervals not exceeding three years, updates it where necessary, tests it and ensures that the emergency services take part in the drill. | Regulation on the Prevention of Major Industrial Accidents, Art. 14(1) | The internal plan and drill step on the page; the interval is the same as the three-year interval in Seveso III. |
In Türkiye the counterpart of Seveso III is the Regulation on the Prevention of Major Industrial Accidents and Mitigation of their Effects; the same two tiers, the same set of documents and the same three-year interval for the internal emergency plan apply.
Legal basis — European Union
| Obligation | Legal basis | How the page covers it |
|---|---|---|
| Member States shall ensure that the operator takes all measures necessary to prevent major accidents and to limit their consequences for human health and the environment. | Seveso III Directive 2012/18/EU, Art. 5(1) | The "what it requires" block on the page: the document duty grows with the tier. |
| Member States shall require the operator to send the competent authority a notification containing the name and address of the operator, information sufficient to identify the dangerous substances, their quantity and physical form, the activity of the installation and the immediate environment of the establishment. | Seveso III Directive 2012/18/EU, Art. 7(1) | The notification step on the page: substances and quantities are notified to the competent authority. |
| The major-accident prevention policy is set out in a written document; it is drawn up a reasonable period of time before construction or operation for new establishments and, in all other cases, within one year from the date the Directive applies to the establishment. | Seveso III Directive 2012/18/EU, Art. 8(1) and 8(2) | The prevention policy step on the page: the major accident prevention policy is prepared and implemented. |
| The operator of an upper-tier establishment produces a safety report demonstrating that a safety management system is in effect, that major-accident hazards and possible scenarios have been identified, that adequate safety and reliability have been taken into account, and that internal emergency plans have been drawn up. | Seveso III Directive 2012/18/EU, Art. 10(1)(a)-(d) | The safety report step on the page: at the upper tier a report is submitted with scenarios, consequences and measures. |
| For all upper-tier establishments the operator draws up an internal emergency plan for the measures to be taken inside the establishment and supplies the competent authority with the information needed for the external plan; the plans are reviewed, tested and where necessary updated at suitable intervals of no longer than three years. | Seveso III Directive 2012/18/EU, Art. 12(1) and 12(6) | The internal plan and drill step on the page: the emergency plan is prepared and tested by regular drills. |
| The competent authority identifies establishments where the risk or consequences of a major accident may be increased because of geographical position, proximity and inventories of dangerous substances; the operators of those establishments exchange suitable information so that the overall hazard can be taken into account in their policies and reports. | Seveso III Directive 2012/18/EU, Art. 9(1) and 9(3)(a) | The domino and land-use step on the page: information is shared with neighbouring establishments. |
| Member States shall ensure that the objectives of preventing major accidents and limiting their consequences are taken into account in land-use policies, pursued through controls on the siting of new establishments, modifications to establishments and new developments in the vicinity of establishments. | Seveso III Directive 2012/18/EU, Art. 13(1)(a)-(c) | The domino and land-use step on the page: input is given to siting decisions. |
Seveso III is Directive 2012/18/EU; it defines two tiers, with notification and a prevention policy at the lower tier and, in addition at the upper tier, a safety report, an internal emergency plan and input to land-use planning.
Legal basis — United Kingdom
| Obligation | Legal basis | How the page covers it |
|---|---|---|
| Every operator must take all measures necessary to prevent major accidents and to limit their consequences for human health and the environment. | Control of Major Accident Hazards Regulations 2015, reg. 5(1) | The "what it requires" block on the page. |
| Within a reasonable period of time prior to the start of construction of a new establishment the operator must send a notification to the competent authority. | Control of Major Accident Hazards Regulations 2015, reg. 6(1) | The notification step on the page. |
| Every operator must prepare and retain a written major accident prevention policy. | Control of Major Accident Hazards Regulations 2015, reg. 7(1) | The prevention policy step on the page. |
| A safety report must contain as a minimum the data and information specified in Schedule 3 and identify the organisations involved in preparing it. | Control of Major Accident Hazards Regulations 2015, reg. 9(1) | The safety report step on the page. |
| The operator of an upper tier establishment must prepare an internal emergency plan and, at suitable intervals not exceeding three years, review, where necessary revise, and test it. | Control of Major Accident Hazards Regulations 2015, reg. 12(1) and 12(6) | The internal plan and drill step on the page. |
| The competent authority must identify groups of establishments, called domino groups, where the risk or consequences of a major accident may be increased. | Control of Major Accident Hazards Regulations 2015, reg. 24(1) | The domino and land-use step on the page. |
In Great Britain the counterpart is the Control of Major Accident Hazards Regulations 2015; the lower and upper tiers continue and the competent authority identifies the domino groups.
Legal basis — United States
| Obligation | Legal basis | How the page covers it |
|---|---|---|
| The employer shall perform an initial process hazard analysis on processes covered by this standard; it shall be appropriate to the complexity of the process and shall identify, evaluate and control the hazards. | 29 CFR 1910.119(e)(1) | The United States counterpart of the safety report step. |
| At least every five years after completion of the initial process hazard analysis the analysis is updated and revalidated. | 29 CFR 1910.119(e)(6) | The interval in the United States counterpart of the internal plan and drill step; Seveso III says three years, here it is five. |
| The employer shall establish and implement an emergency action plan for the entire plant in accordance with the provisions of 29 CFR 1910.38. | 29 CFR 1910.119(n) | The internal plan and drill step on the page. |
| Employers shall retain process hazard analyses and updates or revalidations, and the documented resolution of recommendations, for the life of the process. | 29 CFR 1910.119(e)(7) | The incident and non-conformity module on the page: records and action tracking. |
On the federal occupational safety side in the United States the counterpart is the process safety management standard; there is a coverage threshold instead of a tier and a process hazard analysis instead of a safety report.