Plant emergencies general requirements

Plant emergency is quite a large topic having variations with respect to specific plants. It is hardly possible to cover all these in the limited space of this book. As per the IPL concept, basically, plant emergency is mainly concerned with evacuation. In that sense, ESD is a predictive safety system. From an instrumentation point of view an ESD system is the main system deployed during an emergency and this will be discussed here. Here, only ESD philosophy and general requirements are discussed because specific details of ESD depend on the plant type/facility, for example, the ESD for offshore facilities will be different to that of other plants. 

Generally, risk assessment has focused on the first type of error, since the main interest in human reliability was in the context of human actions that were required as part of an emergency response. However, a comprehensive Consequence Analysis has to also consider other types, since both of these outcomes could constitute sources of risk to the individual or the plant. 

The acceptance criterion for the resolution of GSI II.E.l.l is that plants using emergency feedwater systems shall meet the intent of the guidance identified in SRP Section 10.4.9 and BTP ASB 10-1 and thus meet the requirements of 10 CFR 50 Appendix A (General Design Criteria (GDC)) and 10 CFR 50.34(f)(1). 

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