Springer Series in Reliability Engineering

Transcription

1 Springer Series in Reliability Engineering

2 Series Editor Professor Hoang Pham Department of Industrial Engineering Rutgers The State University of New Jersey 96 Frelinghuysen Road Piscataway, NJ USA Other titles in this series The Universal Generating Function in Reliability Analysis and Optimization Gregory Levitin Warranty Management and Product Manufacture D.N.P Murthy and Wallace R. Blischke Maintenance Theory of Reliability Toshio Nakagawa System Software Reliability Hoang Pham Reliability and Optimal Maintenance Hongzhou Wang and Hoang Pham Applied Reliability and Quality B.S. Dhillon Shock and Damage Models in Reliability Theory Toshio Nakagawa

3 Terje Aven and Jan Erik Vinnem Risk Management With Applications from the Offshore Petroleum Industry 123

4 Professor Terje Aven Professor Jan Erik Vinnem University of Stavanger 4036 Stavanger Norway British Library Cataloguing in Publication Data Aven, T. (Terje) Risk management with applications from the offshore petroleum industry. - (Springer series in reliability engineering) 1. Offshore oil industry - Risk management 2. Risk management I. Title II. Vinnem, Jan Erik ISBN-13: Library of Congress Control Number: Springer Series in Reliability Engineering series ISSN ISBN e-isbn Printed on acid-free paper Springer-Verlag London Limited 2007 Apart from any fair dealing for the purposes of research or private study, or criticism or review, as permitted under the Copyright, Designs and Patents Act 1988, this publication may only be reproduced, stored or transmitted, in any form or by any means, with the prior permission in writing of the publishers, or in the case of reprographic reproduction in accordance with the terms of licences issued by the Copyright Licensing Agency. Enquiries concerning reproduction outside those terms should be sent to the publishers. The use of registered names, trademarks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant laws and regulations and therefore free for general use. The publisher makes no representation, express or implied, with regard to the accuracy of the information contained in this book and cannot accept any legal responsibility or liability for any errors or omissions that may be made Springer Science+Business Media springer.com

5 Preface This book is about making decisions in the face of risks and uncertainties. Our ultimate goal is to arrive at decisions that provide desirable outcomes, but the risks and uncertainties oblige us to acknowledge that the best we can do is to obtain confidence in being able to obtain desirable outcomes. At the point of the decisionmaking we do not know the future outcomes of the activities (alternatives) that we are investigating, and the challenge is then, how we should perform the decisionmaking process. More specifically, some of the main challenges are: How we should identify the relevant decision attributes (quantities related to costs, safety, health, etc.) How we should measure these attributes How we should deal with uncertainties in future performance, in general and through different project phases in particular How we should balance the project risk management perspective and the corporate portfolio perspective How we should take into account the level of manageability in projects How we should use expected values in risk management How we should understand and deal with risk aversion, the cautionary and precautionary principles as well as the ALARP principle (risk should be reduced to a level that is as low as reasonably practicable) How we should formulate and use goals, criteria and requirements to stimulate performance and ensure acceptable safety standards How we should understand and use analyses, including risk analyses, to support decision-making How we should weight the different attributes, using methods such as cost-benefit analyses, cost-effectiveness analyses and multi-attribute analyses How we should involve the stakeholders in the decision-making process.

6 vi Preface In this book we address these challenges. A risk management framework is developed providing an adequate context for how to deal with these challenges. The framework comprises problem definition (challenges, goals and alternatives) stakeholders concerns that need to be taken into consideration in the decision-making process identification of which risk and decision analyses to execute and execution of these managerial review and judgement the decision. Risks and uncertainties are key concepts of this framework. Risk is defined as the combination of the two basic dimensions: (a) possible consequences and (b) associated uncertainties. This definition is in line with that adopted by the UK government (Cabinet Office 2002, p. 7). As there are many facets of these dimensions, the framework implies a broad perspective on risk, reflecting, for example, that there may be different assessments of uncertainties, as well as different views on how these uncertainties should be dealt with. Compared to much of the earlier discussion on this topic, the book has a higher level of precision with regard to the way uncertainty, probability and expected values are understood and measured. Such a precision level is required to give the necessary sharpness on what risk management can and cannot do. The framework gives a structure for classification of risk decision problems, and a procedure for execution of the related decision-making processes. The framework provides a check list for what concerns to address when searching for the best decision alternative. Several classification systems are developed, partly based on the risk classification scheme introduced by Renn and Klinke (2002) and modified by Kristensen et al. (2005). This scheme is based on characterisations of special features of the consequences, such as ubiquity which describes the geographical dispersion of potential damages, and persistency which describes the temporal extension of the potential damages. In addition to this classification of the possible consequences, a system for describing and characterising the associated uncertainties is presented. This system reflects features such as current knowledge and understanding of the underlying phenomena and the systems being studied, the complexity of technology, the level of predictability, the experts competence, and the vulnerability of the system. These classifications are based on features of the two dimensions possible consequences and associated uncertainties i.e., the risks. In addition we focus on a third dimension, the level of manageability. Some risks are more manageable than others, meaning that the potential for reducing the risk is larger for some risks compared to others. By proper uncertainty and safety management, we seek to obtain desirable consequences. The expected values and the probabilistic assessments performed in the risk analyses provide predictions for the future, but what the outcomes will be can be influenced. This leads to consideration of, for

7 Preface vii example, how to run processes aimed at reducing risks (uncertainties) and how to deal with human and organisational factors and obtain a good safety culture. The framework is presented in Chapter 3, following Chapter 1, which gives an introduction to the book using some real life applications, and Chapter 2 which reviews and discusses fundamental risk management principles and methods. These principles and methods are related to basic concepts such as probability, risk, risk analysis and risk management economic principles/theories such as portfolio theory, risk aversion, costbenefit analyses basic principles of safety management, such as the ALARP, the cautionary and precautionary principles the meaning and use of expected values in risk management uncertainty handling (in different project phases) risk acceptance and decision-making (risk acceptance criteria, ethical aspects). The review and discussion are based on recent research related to these topics, clarifying and challenging some of the prevailing paradigms and methods within risk management. Chapter 2 provides new insights and perspectives on basic concepts, theories and methods, and the more practical procedures for implementing them. As an example, we can mention the discussion included on the prevailing approach to the use of risk acceptance criteria and our alternative approach highlighting the generation of alternatives and greater management involvement. Chapters 4 7 present and discuss several examples of applications, in which the framework of Chapter 3 is used. Chapter 4 focuses on concept optimisation, whereas the operations phase is the main topic of Chapter 5, followed by decommissioning in Chapter 6. An application relating to risk indicators on a national level is discussed in Chapter 7. In the final chapter, Chapter 8, we discuss the approaches and framework introduced and used in the previous chapters. What are the main challenges and the key success factors? Specifically we address the importance of understanding the basic building blocks of risk analysis and risk management, and challenges related to the implementation of the framework and an ALARP regime. These applications presume that the reader has a basic knowledge of offshore installations and operations. Although they may lose some details of how the systems being studied work and are operated, readers without such knowledge will also be able to understand and appreciate the main message of these chapters, including the need for risk reducing measures. Our starting point is the offshore oil and gas industry, but our framework and discussion is to a large extent general and could also be applied in other areas. This book is written primarily for risk analysts and managers, and others dealing with risk and risk analysis, as well as academics and graduates. To immediately appreciate the book, the reader should be familiar with basic probability theory. One of our goals, however, has been to reduce the dependency on extensive prior knowledge of probability theory. The key probabilistic concepts will be intro-

8 viii Preface duced and discussed thoroughly in the book, as well as some basic tools such as cost-benefit analyses. Appendix A reviews basic ideas on risk and risk analysis. This makes the book more self-contained, gives it the required focus with respect to relevant concepts and tools, and opens it up for readers outside the primary target group. The book is based on, and relates to, the research literature in the field of risk and uncertainty. References are kept to a minimum throughout, but readers are referred to the bibliographic notes following each chapter, which give a brief review of the material covered and related references. The terminology used in this book is in line with the ISO standard on risk management terminology, ISO (2002). Our definition of risk, however, is slightly adjusted compared to the ISO standard, as discussed in Section 2.1. Our focus is the part of risk management addressing HES (Health, Environment and Safety), and in particular major accidents. When we use the term risk management it is tacitly understood that we have in mind these types of risks. This book is important, in our view, as it provides a guide on how to manage risk and uncertainty in a practical decision-making context and at the same time is precise with respect to concepts and tools in use. Technicalities are reduced to a minimum, ideas and principles are highlighted. Acknowledgments Several people have provided helpful comments and suggestions at various stages of the book s development. In particular we would like to mention Kjell Sandve, Henrik Kortner and Vidar Kristensen. The work is based on a number of research papers and we would like to acknowledge our co-authors; Eirik B. Abrahamsen, Torleif Husebø, Vidar Kristensen, Jens Kørte, Willy Røed, Malene Sandøy, Jorunn Seljelid, Odd J. Tveit, Frank Vollen, Hermann S. Wiencke and Elin S. Witsø. We would also like to acknowledge the assistance by Evelyn Fulton in order to improve the use of the English language in this book. Writing this book has been part of the research project HES Petroleum, Decision Tools, managed by the Norwegian Research Council. This project has provided financial support, which is gratefully acknowledged. The authors wish to thank Anthony Doyle, Oliver Jackson and Simon Rees of Springer-Verlag, London, for their assistance and support in producing the cameraready version. Terje Aven and Jan Erik Vinnem Stavanger, Norway

9 Contents 1 Introduction Fundamentals of Risk Management Challenges Overview of Cases Summary and Conclusions Risk Management Principles and Methods Review and Discussion Perspectives on Risk Economic Principles, Theories and Methods Expected Utility Theory Cost-benefit Analysis and Cost-effectiveness Analysis Portfolio Theory Risk Aversion and Safety Management The Cautionary and Precautionary Principles Discussion of the Meaning and Use of the Precautionary Principle Conclusions The Meaning and Use of Expected Values in Risk Management Uncertainty Handling (in Different Project Phases) Risk Acceptance and Decision-making The Present Risk Analysis Regime for the Activities on the Norwegian Continental Shelf A Review of the Common Practice of the ALARP Principle A Structure for a Risk Analysis Regime Without the use of Risk Acceptance Criteria Cases Common Objections to our Approach Conclusions On the Ethical Justification for the Use of Risk Acceptance Criteria The Influence of the Risk Perspectives Adopted Discussion Conclusions... 74

10 x Contents 3 A Risk Management Framework for Decision Support under Uncertainty Introduction Basic Building Blocks of the Framework The Framework Decision-maker and Stakeholders Decision Principles and Strategies Decision-making Process Discussion and Conclusions Applications Concept Optimisation Historical Background Ocean Ranger Legislative Situation Typical Current Decision-making Application of the Decision-making Framework Framing of the Problem and Alternatives Quantitative Results Qualitative Evaluations Managerial Review and Decision Observations Applications Operations Phase Decision-making Context Deficiencies and the Need for an Alternative Process Framing of Decision Problem and Decision Process Goals and Criteria Problem Definition Generation and Assessment of Alternatives Generation of Alternatives Assessment of Alternatives Managerial Review and Decision Discussion Observations Applications Choice of Disposal Alternative Case Overview Decision-makers and Other Stakeholders Decision Principles and Strategies Framing Describe Goals and Objectives Problem Definition Generate and Assess Alternatives Generate Alternatives Selection of Method Assess Alternatives Managerial Review and Decision Observations Decommissioning Phase

11 Contents xi 7 Applications Risk Indicators, National Level Background and Introduction Objectives of the Risk Level Project Overall Approach Major Hazard Risk Other Indicators Leading vs. Lagging Indicators Event-based Indicators for Major Hazard Risk Indicators for Individual Hazard Categories Basic Risk Analysis Model Challenges in the Trend Analysis Barrier Indicators for Major Hazard Risk Barrier Elements and Performance Requirements Follow-up of Performance by the Industry Availability Data for Individual Barrier Elements Overall Assessment of Barrier Performance Observations Indicators used on National Level The Success Factors Discussion Understanding the Basic Building Blocks of Risk Analysis and Risk Management Basic Concepts and Theories Uncertainty Assessments of Alternatives Cost-benefit Analyses and HES Decision Principles and Strategies Research Challenges Implementation of the Framework Experience with ALARP Demonstration What are the Characteristics of a Good ALARP Demonstration? Needs in order to Improve Applications Appendices A Foundational Issues of Risk and Risk Analysis A.1 A Wide Spectrum of Risk Indices A.2 Classical, Relative Frequency Perspective A.3 Alternative Bayesian Perspective B Example, ALARP Demonstration B.1 Introduction B.1.1 Purpose B.1.2 Structure of Presentation B.1.3 Basic Assumptions and Limitations B.2 Approach Adopted in ALARP Process B.2.1 Risk Acceptance Principles B.2.2 Illustration of ALARP Process B.2.3 Cost-Benefit Analysis

12 xii Contents B.3 Risk Results B.3.1 Risk to Personnel B.3.2 Risk to Assets B.4 Identification of Possible Risk Reducing Measures B.4.1 Good Practice B.4.2 Codes and Standards B.4.3 Engineering Judgement B.4.4 Stakeholder Consultation B.4.5 Tiered Challenge B.5 Evaluation of Individual Risk Reducing Measures B.5.1 List of RRMs B.5.2 Evaluation of RRMs B.6 Overall Evaluation of Risk Reduction Measures B.7 Final Selection of Risk Reduction Measures B.8 Risk Levels after Implementation of Measures B.8.1 Measures Accepted for Implementation B.8.2 Measures Not Accepted for Implementation B.8.3 Residual Risk for Personnel B.8.4 Overall Evaluation of Risk B.9 Implementation Plan for Measures References Index