Fig 1.
Comparison of fuzzy Z-number and intuitionistic fuzzy Z-number.
A and B: a simple fuzzy Z-number. C and D: a simple intuitionistic fuzzy Z-number.
Fig 2.
The process accident model [38].
Fig 3.
Framework of the proposed method.
Table 1.
Weighting scores and details related to experts [41].
Table 2.
Fig 4.
The severity of consequences following barrier failures in each level of the event tree.
Table 3.
Description of the basic events symbols.
Fig 5.
Fault Trees of Different Process Barriers.
A. Fault tree of RPB. b. Fault tree of DPB.c. Fault tree of IPB.d. Fault tree of EPB.
Table 4.
Scores and weighting factors related to experts.
Table 5.
Fuzzy failure probability of BEs based in states of IFS and IZN.
Table 6.
The prior probability of barrier failure and consequences in two modes of IFS and IZN.
Fig 6.
Prior Probabilities of (a) Barrier Failure and (b) Consequence.
Table 7.
The cumulative number of abnormal events that have occurred during the first 12 months.
Table 8.
Likelihood probability of each barrier.
Table 9.
Posterior probability of barrier failure in two states of calculations, IFS and IZN.
Fig 7.
Temporal pattern of the posterior probability of barrier failures in the 12 months (The vertical axis is the probability value, and the horizontal axis is the period).
Table 10.
Posterior probability of consequences in two states of calculations, IFS and IZN.
Fig 8.
Temporal pattern of the posterior probability of consequences in the 12 months (The vertical axis is the probability value, and the horizontal axis is the period).