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Process Hazard Analysis Report July 2020 able to pinpoint the cause and another contractor was called in to troubleshoot. The technician adjusted the set-point higher and closer to the PRV setting on the HPR. The system experienced high pressure and the PRV activated and discharged into the diffusion tank. The compressors were stopped, and personnel noticed the PRV was frosted over. The recommendations were to ensure adequate sensor calibration, which is still occurring today. Ensure there is adequate water make up. There is a min / max water level indicator on the tank and the PRV was changed out. On November 3rd through the 7th in 2016 there was another release of ammonia to the diffusion tank. The tank had been emptied due to the release detailed above. A technician had tested the ammonia sensor and water on the 3'd. He returned on the 7th to do additional work and noticed an ammonia smell. He tested the water and realized that there was a release of ammonia due to the high pH. Oak Ridge Winery determined that the system may have had more ammonia than what was needed. Three recommendations were made and addressed within the allowable timeframe. The recommendations were to confirm the ammonia charge for the system, remove the excess ammonia, and to calibrate the sensor to ensure proper operation. On November 19, 2018 there was a slight smell of ammonia near system 3. Cones were placed to isolate the area and the refrigeration contractor was on-site within 30-minutes. The cause of the smell was a loose oil filter directional valve. The valve was tightened about a '/z turn and the ammonia stopped weeping. The valve had not been active, and this was believed to be a contributing factor. Ammonia has been known to weep from compressors, valves, equipment, etc. when they are not in use. The facility continues to institute daily rounds and ensures employees are trained to report any unusual noises or smells as it pertains to the ammonia systems. 5.4 Process Modifications As part of the PHA review and revalidation process, changes must be taken into consideration. As a good industry practice, Oak Ridge Winery has adopted program 3 management of change practices. Since the last PHA, there have been six (6) recorded modifications to the processes. The brief summary of each is detailed below. MOC 0001 —Addition of automatic solenoid at CH & CH2 (System 1) 12