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:
ompares 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 instrumentation and control systems design is consistent with the requirements for safety systems actions for these events. To the extent deemed necessary, the RSBSRXB reviewer evaluates the effect of single active failures of systems and components which may alter the course of the transient. For new applications, loss of offsite power (LOOP) should not be considered a single failure; loss of feedwater should be analyzed with and without a LOOP in combination with a single active failure. (This position is based upon interpretation of GDC 17, as documented in the Final Safety Evaluation Report for the ABB-CE System 80+ design certification.) This part of the review 34 uses the procedures described in the SRP sections for Chapters 4, 5, 6, 7, 8, and 9 of the SAR. The mathematical models used by the applicant to evaluate core performance and to predict system pressure in the reactor coolant system and main steam line are reviewed by RSBSRXB to determine if these models have been previously reviewed and found acceptable by the staff. If not, a generic review of the model proposed by the applicant is initiated. The values of system parameters and initial core and system conditions used as input to the model are reviewed by RSBSRXB. Of particular importance are the reactivity coefficients and control rod worths used in the applicant's analysis, and the variation of moderator temperature, void, and Doppler coefficients of reactivity with core life. The justification provided by the applicant to show that he has selected the core burnup that yields the minimum margins is evaluated. CPB is consulted regarding the values of the reactivity parameters used in the applicant's analysis.35 The results of the analysis are reviewed, including the effects of the LOOP, and compared to