Document: NUREG-0800
Document ID: 81256f55-72dd-4777-9472-f373c71c4554
Document Type: srp
Title: AC POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550065.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
fety-related functions for 72 hours. However, in accordance with SECY-94-084, SECY-95- 132, and Regulatory Guide 1.206 Section C.IV.10, ac power system features will be evaluated using the process for regulatory treatment of non-safety systems (RTNSS) for electrical distribution issues on passive designs. The AP1000 passive plant design certification, for example, includes an exemption to the requirement of GDC 17 for two physically independent offsite circuits, by providing safety-related passive safety systems for core cooling and containment integrity. However, even for this design, one offsite power source with sufficient capacity and capability from the transmission network should be provided to power the safety-related systems and all other auxiliary systems under normal, abnormal, and accident conditions. The offsite power source should be designed to minimize to the extent practical the likelihood of its failure under normal, abnormal, and accident conditions. Detailed reviews of the offsite ac power system and its interface with the onsite power system for ALWR design applications are covered in Section 8.2, "Offsite Power System." 5. GDC 18 is satisfied as it relates to the testability of the onsite ac power system, and the following guidelines: A. Regulatory Guide 1.32 (see also IEEE Std 308), as it relates to capability for testing of the onsite ac power system. B. Regulatory Guide 1.47, with respect to indicating the bypass or inoperable status of portions of the protection system, systems actuated or controlled by the protection system, and auxiliary or supporting systems that must be operable for the protection system and the system it actuates to perform their safety-related functions. C. Regulatory Guide 1.118 (see also IEEE Std 338), as it relates to the capability for testing the onsite ac power system. D. Regulatory Guide 1.153 (see also IEEE Std 603), as it relates to the onsite ac power system. 6. The design requirements for an onsite ac power