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[en] The Secondary Protection System (SPS), along with the Primary Protection System (PPS) constitutes the Sizewell B Reactor Protection System (RPS). The RPS provides automatic protection from unsafe states arising from faults within the station design basis. The two systems operate as two diverse and independent protection systems, each with its own set of plant sensors, logic equipment and reactor trip switchgear (PPS) and reactor trip contactors (SPS). Each system also derives its own initiation signals for Engineered Safety Safeguard plant items. The SPS system performs the functions of initiation of a reactor trip. It also actuates Engineered Safety Features (ESFs) plant as required, to mitigate the consequences of the fault. The SPS provides claimed protection against all of the frequent (>10-3) initiating faults in the station fault schedule. (Author)
Source
Institution of Electrical Engineers, London (United Kingdom); British Nuclear Energy Society, London (United Kingdom); Institute of Energy, London (United Kingdom); Institution of Mechanical Engineers, London (United Kingdom); Convention of National Societies of Electrical Engineers of Western Europe (EUREL), London (United Kingdom); IEE Conference Publication Series; no.361; 272 p; ISBN 0 85296 550 8; 
; 1992; p. 232-244; Institution of Electrical Engineers; London (United Kingdom); International conference on electrical and control aspects of the Sizewell B PWR; Cambridge (United Kingdom); 14-15 Sep 1992; ISSN 0537-9989;
; 1992; p. 232-244; Institution of Electrical Engineers; London (United Kingdom); International conference on electrical and control aspects of the Sizewell B PWR; Cambridge (United Kingdom); 14-15 Sep 1992; ISSN 0537-9989;