Abstract:
In order to analyze the effect of common cause failure（CCF） on average probability of failure on demand（
Pavg） calculation, fault tree models of a normal excitation 1oo2 system are established. The
Pavg without regard to CCF and
Pavg with regard to CCF（use β factor model） are both calculated. By comparing the calculation results, find that CCF has a great impact on
Pavg calculation. Correlation analysis shows that when the system is safer（dangerous failure rate is lower, the detect rate of dangerous failure is higher）, the impact is greater.
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