Document: NRC Regulatory Guide
Document ID: 74c49394-8dbf-46e7-b62a-b85de93b47d8
Document Type: regulatory_guide
Title: Initial Test Programs for Water-Cooled Nuclear Power Plants + HISTORY - HISTORY 11/2012 – DG-1259 , Proposed Revision 4 11/2006 – DG-1166 , Proposed Revision 3 (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1229/ML12298A071.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.68
CFR Part: 
CFR Title: 

Content:
of loss of turbine generator coincident with loss of all sources of offsite power (i.e., station blackout for passive plants with no emergency diesel generators) (in the range of 10-20 percent power). kk. Demonstrate that the dynamic response of the plant is in accordance with design for the loss or bypass of the feedwater heater(s) from a credible single failure or operator error that would result in the most severe case of feedwater temperature reduction (50 percent, 90 percent). ll. Demonstrate that the dynamic response of the plant is in accordance with design requirements for turbine trip. This test may be combined with the dynamic response testing (item “mm” below) if a turbine trip is initiated directly by all remote-manual openings or automatic trips of the generator main breaker (i.e., a direct electrical signal, not a secondary effect such as a turbine over-speed) (100 percent). mm. Demonstrate that the dynamic response of the plant is in accordance with design for the case of automatic closure of all main steam-line isolation valves. For PWRs, justification for conducting the test at a lower power level, while still demonstrating proper plant response to this transient, may be submitted for NRC staff review (100 percent). nn. Demonstrate that the dynamic response of the plant is in accordance with design for the full load rejection. The method used to open the generator main breakers (by simulating an automatic or manual trip) should be selected, such that the turbine generator will be subjected to the maximum credible over-speed condition. The test should be initiated 16 Regulatory Guide 1.68.2, “Initial Startup Test Program to Demonstrate Remote Shutdown Capability for Water-Cooled Nuclear Power Plants,” (Ref. 33) should be used as guidance for demonstration of this capability. Appendix A to DG-1259, Page A-29 with the plant’s electrical distribution system aligned for normal full-power operation (100 percent). oo. Verify by observations and