High-integrity systems aspects

The fastest to develop will apparently be labelling systems that will certify the entire product life cycle as well as take account of the social and ecological aspects of production, and those that ensure high integrity of labels across the product life cycle, for instance through transactional or scope certificates. 

Such demands are so high they could hardly be ignored. In Clause 2.2 of Chapter VII some aspects were already discussed. Here the discussions will be on architecture of the integrated systems due consideration will be given to lEC standards. It is advisable that Clause 7.4.2.3 of lEC 61508-2 2010 and Clause 11.2.2/11.2.3/11.2.4/ 11.2.9/11.2.10 of lEC 61511-1 2004 are referred to. 

This book is divided into three parts. The first part. High-integrity Safety Instrumented Systems (Chapter 2), deals with the following aspects ... 

This chapter provides an overview of the design considerations for high-integrity l C systems including the following aspects. 

There is a lot of experience to show that the most critical aspect of designing high-integrity systms is to make sure the specification is correct. Figure 2.3 presents UK Health and Safety Executive data which shows that 44% of control systan failures in industrial control systems can be attribnted to poor specification. 

The problems associated with carrying out the refuelling operation require a high Integrity control system for their solution. The two key criteria for such a control system are (a) safety and (b) system availability. The safety aspects cover areas such as prevention of radioactive release and plant damage whereas system availability Includes reduction of downtime and hence reduction In lost revenue due to the refuelling shutdown. 

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