Document: NUREG-0800
Document ID: 88ed0d92-9d6e-40b1-b060-6d7334f66eb8
Document Type: srp
Title: Revision 3 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070710478.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8
CFR Part: 
CFR Title: 

Content:
p, loss-of-coolant accident, startup or shutdown, with the offsite power supply (grid) at minimum anticipated voltage and only the offsite source being considered available. Maximum voltages should be analyzed with the offsite power supply (grid) at maximum expected voltage concurrent with minimum unit loads (e.g., cold BTP 8-6-4 Revision 3 - March 2007 shutdown, refueling). A separate set of the above analyses should be performed for each available connection to the offsite power supply. 4. The analytical techniques and assumptions used in the voltage analyses cited in item 3 above must be verified by actual measurement. The verification and test should be performed before initial full-power reactor operation on all sources of offsite power by taking the following actions: a. Loading the station distribution buses, including all Class 1E buses down to the 120/208-volt level, to at least 30 percent b. Recording the existing grid and Class 1E bus voltages and bus loading down to the 120/208-volt level at steady-state conditions and during the start of both a large Class 1E and non-Class 1E motor (not concurrently) Note: To minimize the number of instrumented locations (recorders) during the motor-starting transient tests, the bus voltages and loading need only be recorded on that string of buses that previously showed the lowest analyzed voltages from item 3 above. c. Using the analytical techniques and assumptions of the previous voltage analyses cited in item 3 above, and the measured existing grid voltage and bus loading conditions recorded during conduct of the test, calculate a new set of voltages for all the Class 1E buses down to the 120/208-volt level d. Compare the analytically derived voltage values against the test results With good correlation between the analytical results and the test results, the test verification requirement will be met. That is, the validity of the mathematical model used to perform the analyses of item 3 will have been established,