国際機能安全規格の動向 : 安全度水準(SIL)の推定モデル

概要

論文の詳細を見る
The safety integrity level (SIL) is determined by taking account of both random hardware failures of SRS and demands for implementation of a safety function(s) to prevent a hazardous event(s) from occurring. Here, one of the simplest systems, in which an SRS with a constant failure rate implements a safety function and no other protection layer than that SRS exists, is taken for showing how the relationship between the failures of SRS and the risk frequency (i.e. hazardous event rate) is formulated by use of Markov techniques. The conventional method for evaluation of PFD and PFH sometimes gives us dangerous estimation of the tolerable common-caused dangerous-undetected failure-rate. The approach in the present paper will contribute toward solving the problem.
社団法人電子情報通信学会の論文
2006-10-19