Document: NUREG-0800
Document ID: 824740ba-eb51-4b24-bd6f-df01c35d75f3
Document Type: srp
Title: LOSS OF NONEMERGENCY AC POWER TO THE STATION AUXILIARIES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550008.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.2.6
CFR Part: 
CFR Title: 

Content:
applicant in the SAR is reviewed by the organization responsible for review of transients and accidents analyses regarding the occurrences leading to the initiating event. The sequence of events from initiation until condition stabilization is reviewed to ascertain: A. The extent to which normally operating plant instrumentation and controls are assumed to function. B. The extent to which plant and reactor protection systems are required to function. C. The credit taken for the functioning of normally operating plant systems. D. The operation of engineered safety systems required. E. The extent to which operator actions are required. F. The operation of standby diesel generators required. 15.2.6-7 Revision 2 - Month 2007 G. Whether the description accounts for appropriate margin for malfunctions like stuck rods (per subsection II.B of this SRP section). 2. If the SAR states that the loss of ac power transient is not as limiting as some other similar transient, the reviewer evaluates the applicant’s justification. If the SAR presents a quantitative analysis of the loss of ac power transient, the timing of the initiation of those protection, engineered safety, standby diesel generator, and other systems needed to limit transient consequences acceptably level is reviewed. The reviewer compares the predicted variation of system parameters to various trip and system initiation setpoints. The review of SAR Chapter 7 confirms whether the instrumentation and control systems design is consistent with the requirements for safety system actions for these events. To the extent necessary, the reviewer evaluates the effects of single, active system and component failures which may affect the course of the transient. This aspect of the review uses the procedures described in SRP sections for SAR Chapters 4, 5, 6, 7, 8, and 9. 3. The applicant’s mathematical models for evaluating core performance and predicting system pressure in the RCS and main steam lines are reviewed by