Document: NUREG-0800
Document ID: 16afcc26-09c8-4627-8906-8c56ffe8434b
Document Type: srp
Title: LOSS OF NORMAL FEEDWATER FLOW
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070683.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.2.7
CFR Part: 
CFR Title: 

Content:
ow are used during the reviews 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 normal feedwater flow transient presented by the applicant in the SAR is reviewed by RSBSRXB regarding the occurrences leading to the initiating 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. That appropriate margin for malfunctions, such as stuck rods (per II.3.b above) are accounted for. 7. The operation of auxiliary systems that is required. If the SAR states that the loss of feedwater 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 feedwater transient is presented in the SAR, the RSBSRXB reviewer, with the aid of ICSBHICB reviewer, reviews the timing of the initiation of those protection, engineered safety, and other systems needed to limit the consequences of the loss of feedwater transient to an acceptable level. The RSBSRXB reviewer compares the predicted variation of system parameters with various trip and system initiation setpoints. The ICSBHICB review of 15.2.7-9 DRAFT Rev. 2 - April 1996 Chapter 7 of the SAR confirms that the