Analysis and Estimation of Core Damage Frequency of Flow Blockage and Loss of Coolant Accident: A Case Study of a 10 MW Water-Water Research Reactor-PSA Level 1

Table 4

System fault tree with the top event “no emergency ventilation.”

Basic event	Components failure identification	Probability
1	No signal	8.300 × 10^−4
2	Human error	1.000 × 10^−2
3	Filters fail	3.440 × 10^−4
4	Air pump F failed	2.270 × 10^−3
5	Two valves (h) fail to open	1.680 × 10^−3
6	Loss of normal offsite power	1.000 × 10^−4
7	AC generator fails	2.790 × 10^−3
8	Diesel motor fails	8.200 × 10^−3
9	Switches fail stuck	3.200 × 10^−2