Document: NUREG-0800
Document ID: 050fa52d-0a13-4146-93e4-0f4659c7d893
Document Type: srp
Title: LOSS OF NONEMERGENCY AC POWER TO THE STATION AUXILIARIES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350140.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.2.6
CFR Part: 
CFR Title: 

Content:
accordance wih Regulatory Guide 1.105. Compliance with Regulatory Guide 1.105 is determined by ICSB. III. REVIEW PROCEDURES The procedures below are used during the review of both construction permit (CP) and operating license (OL) applications. During the CP review the values of system parameters and setpoints used in the analysis will be preliminary in nature and subject to change. At the OL review stage, final values should be used in the analysis and the 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 RSB regarding the occurrences leading to the initi- ating event. The 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. 15.2.6-4 Rev. 1 - July 1981 7. That appropriate margin for malfunctions, such as stuck rods (per II.3.b above) are 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 RSB reviewer, with the aid of the ICSB reviewer, reviews the timing of the initiation of those protection, engineered safety, standby diesel generator, and other systems needed to limit the consequences of the transient to an acceptable level. The RSB reviewer compares the predicted variation of