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:
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 plant in as close to normal operating condition as is possible. (It should be noted that not all valves can be placed in the required positions because of operating procedure requirements or personnel or equipment safety factors.) b. Shut off instrument air supply in a manner that would simulate an instrument air pipe break and verify the movements of the affected components. Also verify the adequacy of the various feeders or branches to sustain an adequate share of the decaying air supply as required by the operational mode; i.e., verify that branches of smaller pipe sizes are not starved by flow to branches of larger capacity. 9. Rerun the test outlined in Regulatory Position C.8 with the exception that, during this test, shut off instrument air supply very slowly to simulate the loss of instrument air by moisture freezing and plugging the main supply line. 10. Rerun the tests outlined in Regulatory Positions C.8' and C.9 with the exception that, during these tests, place the valves in their normal operating position. 11. The results of each test performed in accordance with Regulatory Positions C.A through C.10 above should be included in the startup report2 which should present a description of the test, a comparison of test results predicted by the test procedures, identification of conditions encountered which were not anticipated, corrective actions, if any, and an evaluation of test results. See Regulatory Guide 1.16, "Reporting of Operating Information," Revision 1, October 1973., Section C.l.a.(1). K 1. 80-2