Experiences on risk analysis, modelling and the

preparation of safety reports in the Netherlands

Eric van der SchansSenior ConsultantDHV

Content

1. What is in a safety report? And why?

2. The various types of risk assessment

The objective of the safety report is twofold

1. To provide a case to the authorities that the establishment can be operated safely

2. To inform the authorities and the public on the activities and risks of the establishment

And there are more objectives possible

3. To facilitate inspections by the authorities

4. The Safety Report as a starting point for a Population Protection Plan

5. The Safety Report as an information source within the establishment

The content of a Dutch safety report

The required content of is specified in a “Guideline for information requirement of the Seveso II Directive”

Guideline is derived from EU guidelines and sharpened during pilot projects in the Netherlands

The safety report is divided into three volumes

The content of a Dutch safety report

Volume 1 Description of the establishment (including

safety management system)

Volume 2 Detailed description of the various installations

Volume 3 Risk assessments

Risk assessment in the Safety Report

The objectives of the risk assessment is:

Demonstrate that the establishment is operated safely

Inform the authorities (and public) of the remaining risks of the establishment

The risk assessments focus on various kinds of risks

Risk for the population Quantitative Risk Assessment (QRA)

Risk for the environment Surface water risk Assessment (SWRA)

Risk for personnel Bowtie Analysis of available lines of defences

(qualitative) Emergency preparedness Analysis (semi-

quantitative)

10-5

10-6

10-7

10-8

Quantitative Risk Assessment (QRA)

Objective: Assess the risk for the population in a

quantitative way

Requirements: Assessment criteria Sound method (rules on what and how to

model the risks) Software tools

Surface water risk assessment

Objective:Assess the risks for the surface water in a quantitative way

Requirements:As with a QRA

Bowtie Risk Assessment

Objective: Demonstrate technical and organisational

“lines of defence”R

oot C

ause

s

Effe

ct

Loss of containment

Line of defence

Emergency preparedness Analysis

Objective: Assess the need for a fire brigade in the

establishment and

Assess the size and equipment of the fire brigade

Starting point: The credible effects from the bowtie