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Process Hazard Analysis Report July 2020 SYSTEM APPLICABILITY SAFETY SYSTEM System System System COMMENTS No. 1 No. 2 No. 3 Alarm to prevent High level vessel alarms Q Q Q liquid carryover to the compressor(s) Ammonia detection and alarm system Detector in the relief for response to elevated levels of Q ❑ ❑ vent line at Diffusion ammonia vapor in the relief line. Tank to notify Emergency refrigeration control Shuts down switches ("Stop Button" or"E-Stop") for Q Q Q compressor emergency shutdown of the system operation Fire suppression to prevent damage and Fire sprinkler system and fire Q Q Q potential release due extinguishers to overpressure caused by heat from a fire Prevent uncontrolled Spring-loaded, self-closing ("deadman") Q Q Q release of liquid oil drain valves ammonia during oil removal procedure Prevents release of Check valve at charge point for adding ammonia in the ammonia to system 0 ❑ ❑ event of a hose or valve failure at the char a point Manual isolation valves at vessels Q Q Q Emergency shower and eyewash Q Q Q stations 5.3 Past Incidents There were no incidents meeting the 5-year reporting requirements at the facility since the last PHA/ program update. The facility implements a throughout incident investigation process and investigates near-misses and minor incidents. The team reviewed the incident reports on file and concluded that the incidents were addressed appropriately and confirmed actions were taken to prevent reoccurrence. None of the incident scenarios were included in the PHA what-if questions. A few incidents are described below. On 7/12/16 there was a release of approximately 47 pounds of ammonia to the diffusion tank. System 1 chiller was not service, and the system had been shutting down over the few weeks prior. The prior refrigeration contractor had not been 11