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:
e a significant role in accident and consequence mitigation by providing defense-in-depth functions to supplement the capability of the safety-related passive systems. Certified passive designs should demonstrate how the RTNSS evaluation process addresses the resolution of design issues, in accordance with SECY-94-084, SECY-95-132, and Regulatory Guide 1.206 Section C.IV.10. Subsequent COL applications could then reference the RTNSS evaluation in the applicable existing certified design control documents to demonstrate compliance with design requirements for passive design power systems as described in Section C.III.1 of Regulatory Guide 1.206. Further detailed information and guidance on electrical design for passive COL applications is provided in Section C.III.1.8.3.1 of Regulatory Guide 1.206, SECY-94-084, and SECY-95-132. The COL applicant should submit a reliability assurance program describing the reliability assurance activities it will perform before the initial fuel load. The program should maintain the reliability objectives consistent with the PRA assumptions designed into the plant. Reliability assurance activities for the operating stage are integrated into existing programs (e.g., maintenance rule, surveillance testing, inservice inspection, inservice testing, and quality assurance). Further detailed information and guidance on reliability assurance programs for passive COL applications are provided in Section C.III.17.4 of Regulatory Guide 1.206, SECY-94-084, and SECY-95-132. Provisions should also be included to minimize the probability of losing electric power from any of the remaining supplies as a result of, or coincident with, the loss of power generated by the nuclear power unit, the loss of power from the transmission network, or the loss of power from the onsite electric power supplies. The trip of the nuclear power unit is an anticipated operational occurrence that can result in reduced switchyard voltage, potentially actuating the plant’s