Document: NRC Regulatory Guide
Document ID: 25a5daff-c390-423e-a736-7744b82624bb
Document Type: regulatory_guide
Title: Preoperational Testing of Instrument Air Systems
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1306/ML13064A110.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.80
CFR Part: 
CFR Title: 

Content:
standby compressors, high and low pressure alarms, pressure indicators, and temperature indicators. Verify validity of relief valve settings. 3. Test air dryer units for proper functioning and operate units through at least one regeneration cycle. Verify operation at maximum flow rates. Verify appropriate differential pressures and proper operation of pressure switches, high and low pressure alarms, safety and/or relief valves, bypass valves and alarms, and resets. 4. Verify by test that the instrument air system will meet specifications relating to flow, pressure, and temperature of the product air. 5. Verify by test that the system will meet cleanliness requirements with respectto oil, water, and particulate matter contained in the product air by analyzing the air at the end of each main feeder line using continuous flow techniques or by the analysis of a discrete sample. 6. When redundant components of the instrument air system are required, verify by test that the failure or loss of function of one component will not prevent the proper operation of the others. 7. Test and check for proper operation all safety-related instruments, controls, and valves served by the instrument air system. Verify that all safety-related instruments, controls, and valves served by each branch of the system are properly labeled and that their remote controls, indicators, and alarms are correctly identified. Verify by test that the failure of any non-safety-related instruments, controls, and valves served by the instrument air system or the lines leading thereto will not jeopardize the safety-related parts of the system. 8. Conduct a loss-of-instrument-air-supply test on all branches of the system simultaneously, if practicable, or on the largest number of branches of the system that can be adequately managed as follows: a. Prior to the test, place the valves to be tested, except for those valves which fail as is, in a position other than the failed position. Maintain the rest of the