thank you! a and B

1. The system below includes a process reactor for a highly unstable process that is sensitive to small increases in temperature. The system is equipped with a deluge water system for emergency cooling to protect against an uncontrolled reaction. To prevent a runaway reaction during an increase in temperature, the inlet flow of process material to the reactor must be stopped or the deluge system must be activated. The reactor temperature is monitored by a sensor (T1) that automatically activates the deluge system by opening the deluge water supply valve when a temperature rise is detected. At the same time, sensor T1 sounds an alarm in the control room to alert the operator of the temperature rise. When the alarm sounds, the operator pushes the "inlet valve close" button to close the inlet valve and stop inlet flow to the reactor. The operator also pushes the "deluge system open" button in the control room if the deluge system is not activated by sensor T1. If the inlet valve closes or the deluge system is activated, system damage due to an uncontrolled reaction is averted. (a) Considering the Top Event to be "Damage to reactor due to high process temperature," construct a fault tree diagram for the system. (b) What could be done to improve the reliability of the system safeguards