Document: NUREG-0800
Document ID: 73a7c7ff-f0ac-467b-ba1d-0fb71e328868
Document Type: srp
Title: examines this margin to ensure that specified acceptable fuel design limits are not
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070705.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.3.2
CFR Part: 
CFR Title: 

Content:
e 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 RSBSRXB50 reviewer, in coordinating coordination with the ICSBHICB reviewer, reviews the timing of 51 52 the initiation of those protection, engineered safety, and other systems needed to adequately limit the consequences of the loss of flow. The RSBSRXB reviewer compares the predicted 53 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. For new applications, loss of offsite power (LOOP) should not be considered a single failure; each loss of flow transient 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.) The ICSBHICB review of Chapter 7 of the SAR confirms that the 54 55 instrumentation and control design is consistent with the requirements for safety systems actions for these events. DRAFT Rev. 2 - April 1996 15.3.1-8 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 RSBSRXB to determine if these models have been previously reviewed and found acceptable 56 by the staff. If not, CPB is requested tothe SRXB should initiate a generic review of the 57 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 RSBSRXB. Of particular importance are the reactivity coefficients 58 and