1. Consider a chemical reactor system which has a high temperature alarm installed to warn the operator of a high temperature within the reactor. The event tree for a loss of coolant initiating event is shown in figure below. Four safety functions are identified. a) Calculate the frequency that dangerous runaway will occur based on event tree. b) Propose two solutions to reduce the frequency of runaway. Safety function: Results: High-Temp alarm alerts operator B 0.01 Operator notices high temp C 0.2 Operator restarts cooling D 0.2 Operator shuts down reactor E 0.1 Identifier: Failure/demand: Success Continue Success Success Success Shutdown Failure A A Failure Runaway Initiating event: loss of cooling 5 occurence/yr Success Continue Success Success Shutdown Failure Failure Failure Runaway Failure Runaway