Document: NRC Regulatory Guide
Document ID: 1731a882-b0c5-418d-b65e-55646c26be5c
Document Type: regulatory_guide
Title: 03/2007
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0703/ML070380553.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.9
CFR Part: 
CFR Title: 

Content:
a load equal to 90–100 percent of the continuous rating while operating at its design load power factor and verify that the voltage requirements are met and that the unit will not trip on overspeed. 2.2.9 Endurance and Load Margin Test Clause 7.5.9 of IEEE Std 387-1995 should be supplemented as follows: This test involves demonstrating the capability of the emergency diesel generator at continuous rating and worst case power factor for an interval of not less than 24 hours. Of this period, 2 hours are at a load equal to 105–110 percent of the diesel generator’s continuous rating, and 22 hours are at a load equal to 90–100 percent of the generator’s continuous rating. The test process should verify that frequency and voltage requirements are maintained. 2.2.10 Hot Restart Test Clause 7.5.10 of IEEE Std 387-1995 should be supplemented as follows: This test involves demonstrating the hot restart functional capability at full load-temperature conditions (after the emergency diesel generator has operated for 2 hours at continuous rating) by verifying that the emergency diesel generator starts on a manual or auto-start signal, attains the required frequency and voltage within acceptable limits and time, and operates for longer than 5 minutes. This test may be performed following the endurance and margin test described above. 2.2.11 Periodic-Trip Bypass Test Clause 7.5.12 of IEEE Std 387-1995 should be supplemented as follows: This test involves demonstrating that automatic diesel generator unit trips are automatically bypassed as designed. Typically, engine overspend, generator differential current trip and those trips retained with coincident logic are not bypassed. This test should also verify that the critical protective trips that are not automatically bypassed perform their intended function. 2.3 Preoperational and Surveillance Testing Table 1 relates preoperational and surveillance tests to the anticipated schedule for performance (e.g., preoperational,