Document: NUREG-0800
Document ID: 805f7e09-51a2-413b-92af-e23bb9073497
Document Type: srp
Title: NUREG-0800
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070493.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8
CFR Part: 
CFR Title: 

Content:
d as prohibiting tThe staff's position regarding use of plantonsite emergency power diesel-generator sets for purposes other than that of supplying standby power when needed is that such use should be prohibited . In 21 particular, emergency power diesel-generator sets should not be used for peaking service. C. REFERENCES 1. 10 CFR Part 50, Appendix A, General Design Criterion 17, "Electric Power Systems."22 2. Regulatory Guide 1.32, "Criteria for Safety-Related Electric Power Systems for Nuclear Power Plants."23 3. IEEE STDtd 308-1974, "IEEE Standard Criteria for Class 1E Systems for Nuclear Power Generating Stations."24 8A-7 DRAFT Rev. 3 - April 1996 BRANCH TECHNICAL POSITION ICSB-11 (PSB) STABILITY OF OFFSITE POWER SYSTEMS A. BACKGROUND The staff has traditionally required each applicant to perform stability studies for the electrical transmission grid which would be used to provide the offsite power sources to the plant. The basic requirement is that loss of the largest operating unit on the grid will not result in loss of grid stability and availability of offsite power to the plant under consideration. In some cases, such as plants on the island of Puerto Rico, the plant is connected to an isolated power system of limited generating capacity. These kinds of isolated power systems are inherently less stable than equivalent systems with supporting grid interties. It is also obvious that limited systems are more vulnerable to natural disasters such as tornadoes or hurricanes. B. BRANCH TECHNICAL POSITION 1. The staff has concluded, from a review of appropriate reliability data, that power systems with supporting grid interties meet the grid availability criterion with some margin. This conclusion is applicable to the review of most plants located on the U.S. mainland. 2. There is also strong indication that an isolated system large enough to justify inclusion of a nuclear unit will also meet this criterion. However, as a conservative approach, the staff will