Document: NUREG-0800
Document ID: 0b17303b-e5cc-4091-b22c-056b0c78eb34
Document Type: srp
Title: – 15.3.4
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070707.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.3.3
CFR Part: 
CFR Title: 

Content:
B48 reviewer, reviews the timing of the initiation of those protection, engineered safety, and other systems needed to limit the consequences of the accident to acceptable levels. The RSBSRXB reviewer compares the 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 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 safety systems and components which may alter the course of the accident. For new applications, the LOOP is not considered a single active failure, but considered in addition to a single active failure as discussed in subsection II.7. This phase of the review uses the system 49 review procedures described in the SRP sections for Chapters 5, 6, 7, and 8 of the SAR. 15.3.3-9 DRAFT Rev. 3 - April 1996 The mathematical models used by the applicant to evaluate core performance and to predict system pressure in the reactor coolant system and main steam lines are reviewed by RSBSRXB to determine if these models have been previously reviewed and found acceptable by the staff. If not, CPB is requested to initiate SRXB initiates a generic review of the model proposed by 50 the applicant. The values of system parameters and initial core and system conditions used as input to the model are reviewed by the 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. 51 The results of the applicant's