Document: NUREG-0800
Document ID: 72cf12c3-a823-4385-bbf4-92e2b543a906
Document Type: srp
Title: AC POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070498.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
tly mounted on the engine or associated piping, the controls and monitoring instruments shall 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 shall be equipped with vibration mounts.] h. For new applications, the design should provide that at least one offsite circuit to each redundant safety division be supplied directly from an offsite power source with no intervening nonsafety buses, thereby permitting the offsite source to supply power for safety buses when a nonsafety bus fails. The design should also include an alternate power source to nonsafety loads, unless it can be demonstrated that existing design margins will result in transients for loss of nonsafety power events that are no more severe than those associated with the turbine-trip-only event specified in plant designs.65 5. General Design Criterion 18 (GDC 18), as related to the testability of the onsite ac 66 power system, and the following guidelines: of Regulatory Guide 1.118 (see also IEEE 338), as related to the capability for testing the onsite ac power system. a. Regulatory Guide 1.32 (see also IEEE Std 308), as related to capability for testing of the onsite ac power system. b. Regulatory Guide 1.118 (see also IEEE Std 338), as related to the capability for testing the onsite ac power system. c. Regulatory Guide 1.153 (see also IEEE Std 603), as related to the onsite ac power system.67 6. The design requirements for an onsite ac power supply for systems covered by General Design Criteria 33, 34, 38, 41, and 44 are encompassed in General Design CriterionGDC 17.68 7. General Design Criterion 50 (GDC 50), as related to the design of containment 69 electrical penetrations containing circuits of the ac power system, and the guidelines of Regulatory Guide 1.63 (see also IEEE Stds 242, 317, and 741), as related to the capability of electric penetration assemblies in containment structures to withstand a