* The first five steps involve the problem formulation for an FTA .
6. Construct the FT.
7. Evaluate the FT.
Interpret and present the results.
The remaining steps involve the actual construction of the FT, the evaluation of the FT, and the interpretation of the FT results.
SYMBOL REPRESENTATIONS Circle – it means that basic failure Diamond – it means that basic fault Rectangle – it means that resultant event Double diamond – represents an event House – represents the basic event
For an emergency operation theatre in a hospital, the power is obtained from the main city supply through a transformer connected in series. To ensure an uninterrupted supply, an auxiliary generator is also used with a suitable switch-over. The probability of failure of the city supply is 0.01 and the transformer reliability is 0.996. the auxiliary power generator has a reliability factor of 0.99. draw the block diagram for the system. Construct the fault tree and, based on this, calculate the reliability of the system.