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:
reference the RTNSS evaluation in the applicable existing certified design control documents (DCDs) to demonstrate compliance with design requirements for passive design power systems as described in Section C.III.1 of RG 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 RG 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 probabilistic risk assessment (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 RG 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 degraded voltage protection and separating the plant=s safety buses from offsite power. It can also result in grid instability, potential grid collapse, inadequate switchyard voltages, and a subsequent LOOP due to loss of the real and/or reactive power support supplied to the grid from the nuclear unit. Plant technical specifications (TS) limiting conditions for operation (LCO) require the offsite power system to be