Document: NUREG-0800
Document ID: e75b7685-2a36-4e9b-a431-02d166dcf372
Document Type: srp
Title: LOSS OF NONEMERGENCY AC POWER TO THE STATION AUXILIARIES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070681.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.2.6
CFR Part: 
CFR Title: 

Content:
nd operating license (OL) applications. During the CP review the values of 45 system parameters and setpoints used in the analysis will be preliminary in nature and subject to change. At the COL or OL review stage, final values should be used in the analysis and the 46 reviewer should compare these to the limiting safety system settings included in the proposed technical specifications. The description of the loss of ac power transient presented by the applicant in the SAR is reviewed by RSBSRXB regarding the occurrences leading to the initiating event. The 47 sequence of events from initiation until a stabilized condition is reached is reviewed to ascertain: 1. The extent to which normally operating plant instrumentation and controls are assumed to function. 2. The extent to which plant and reactor protection systems are required to function. 3. The credit taken for the functioning of normally operating plant systems. 4. The operation of engineered safety systems that is required. 5. The extent to which operator actions are required. 6. The operation of standby diesel generators that is required. 15.2.6-7 DRAFT Rev. 2 - April 1996 7. That appropriate margin for malfunctions, such as stuck rods (per II.3.bII.b above) are 48 accounted for. If the SAR states that the loss of ac power transient is not as limiting as some other similar transient, the reviewer evaluates the justification presented by the applicant. If a quantitative analysis of the loss of ac power transient is presented in the SAR, the RSBSRXB reviewer, 49 with the aid of the ICSBHICB reviewer, reviews the timing of the initiation of those 50 protection, engineered safety, standby diesel generator, and other systems needed to limit the consequences of the transient to an acceptable level. The RSBSRXB reviewer compares the 51 predicted variation of system parameters with various trip and system initiation setpoints. The ICSBHICB review of Chapter 7 of the SAR confirms that the instrumentation and control