Throwing a bridge between risk assessment and functional safety

Author

Sato, Yoshinobu

Author_Institution

Tokyo Univ. of Marine Sci. & Technol., Tokyo

fYear

2007

fDate

17-20 Sept. 2007

Firstpage

2484

Lastpage

2488

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;

fLanguage

English

Publisher

ieee

Conference_Titel

SICE, 2007 Annual Conference

Conference_Location

Takamatsu

Print_ISBN

978-4-907764-27-2

Electronic_ISBN

978-4-907764-27-2

Type

conf

DOI

10.1109/SICE.2007.4421407

Filename

4421407