Document: NUREG-0800
Document ID: 9cfc38bf-7808-446e-a43d-4ca9ff55df2a
Document Type: srp
Title: AC POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1007/ML100740289.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
ctional (i.e., fuses in place, no loose wires, test leads removed, etc.) and all valves are in the proper position. The test procedure(s) should explicitly state that upon satisfactory test completion the diesel generator unit should be returned to a ready automatic standby service under the control of the control room operator. v. Except for sensors and other equipment that need to be directly mounted on the engine or associated piping, the controls and monitoring instruments should be installed on a free-standing, floor-mounted panel located on a vibration-free floor area. [NOTE: If the floor is not vibration free, the panel should be equipped with vibration mounts.] 8.3.1-11 Revision 4 - May 2010 J. Acceptance criteria for the interface between the onsite ac power system and the offsite power system to satisfy the requirements of GDC 17 in evolutionary LWR design applications are documented in SECY-91-078, which states that the design should include at least one offsite circuit to each redundant safety division supplied directly from one of the offsite power sources with no intervening non-safety buses in such a manner that the offsite source can power the safety buses upon the failure of any non-safety bus. The evolutionary LWR design should also include an alternate power source to non-safety loads, unless it can be demonstrated that existing design margins will ensure that transients for loss of non-safety power events are no more severe than those associated with the turbine-trip-only event specified in current plant designs. Passive LWR design applications provide passive safety systems that do not need Class 1E ac electric power, other than that provided by the Class 1E dc batteries and their inverters, to accomplish the plant's safety-related functions for 72 hours. However, in accordance with SECY-94-084, SECY-95-132, and RG 1.206 Section C.IV.10, ac power system features will be evaluated using the process for regulatory treatment of non-safety systems