Title :
Throwing a bridge between risk assessment and functional safety
Author_Institution :
Tokyo Univ. of Marine Sci. & Technol., Tokyo
Abstract :
Risk assessment must be established for reasonable operation of functional safety. So far, the relationships between the risk frequency, i.e., hazardous event rate, and the safety integrity of safety-related systems have not been clear for the general demand modes of operation. Then, the present paper describes the new formulations of hazardous event rate (HER) as well as the risk reduction ratio (RRR) for the general demand modes of operation, and proposes the method how to determine safety integrity levels of SRS using HER, RRR, table 2 and 3 in the standard of IEC 61508, functional safety of electrical/electronic/programmable electronic safety-related systems.
Keywords :
Markov processes; electrical safety; fault trees; hazards; logic gates; risk management; safety systems; 1-out-1 systems architecture; Markov state-transition diagrams; and-gates; electrical programmable safety systems; electronic programmable safety sytems; failure rate; fault trees; functional safety; hazardous event logics; hazardous event rate; hazardous risk reduction; risk assessment; safety integrity; safety-related systems; Automatic testing; Bridges; Electrical safety; Frequency estimation; IEC standards; Logic; Marine safety; Marine technology; Risk management; Telephony; Functional safety; Hazardous event rate; Keywords; Risk assessment; Safety integrity; Safety integrity level;
Conference_Titel :
SICE, 2007 Annual Conference
Conference_Location :
Takamatsu
Print_ISBN :
978-4-907764-27-2
Electronic_ISBN :
978-4-907764-27-2
DOI :
10.1109/SICE.2007.4421407
