Document: NUREG-0800
Document ID: d967feb0-b1b1-4bfb-a8b4-1d6ce45e13a2
Document Type: srp
Title: 4
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350154.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.3.1
CFR Part: 
CFR Title: 

Content:
Rev. 1 - July 1981 If the SAR states that a particular loss of fl6w transient is not as limiting as some other similar transients, the reviewer evaluates the Justification presented by the applicant. The reviewer confirms that all types of flow loss transients are considered, e.g., pump trips'during two-, three-, and four-loop operation. The applicant is *to present a quantitative analysis in the SAR of the loss of flow transient that is determined to be most limiting. For this transient, the RSB reviewer, in coordinating with the ICSB reviewer, reviews the timing of the initiation of those protection, engineered safety, and other systems needed to adequately limit the consequences of the loss of flow. The RSB reviewer compares the predicted variation of system parameters with various trip and system initiation setpoints and evaluates the effects of single active failures of systems and components which may alter the course of the transient. The ICSB review of Chapter 7 of the SAR confirms that the instrumentation and control design is consistent with the requirements for safety systems actions for these events. 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 the RSB to determine if these models have been previously reviewed and found acceptable by the staff. If not, CPB is requested to initiate a generic review of the applicant's proposed model. The values of system parameters and initial core and system conditions used as input to the model are reviewed by the RSB. Of particular importance are the reactivity coefficients and control rod worths used by the applicant in his analysis, and the variation of moderator temperature, void, and Doppler coef- ficients 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