Document: NUREG-0800
Document ID: 47c0ffe8-0c76-4d7a-8671-f04b7c8ae803
Document Type: srp
Title: – 15.3.2
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070705.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.3.1
CFR Part: 
CFR Title: 

Content:
ich are pertinent to the loss of flow transient; the methods of thermal and hydraulic analysis; the postulated sequence of events, including time delays prior to and after protective system actuation; assumed reactions of reactor systems components; the functional and operational characteristics of the reactor protection system in terms of how it affects the sequence of events; and all operator actions required to secure and maintain the reactor in a safe condition. The results of the applicant's analyses are reviewed to ensure that values of pertinent system parameters are within expected ranges for the type and class of reactor under review. The system parameters that are evaluated include core flow and flow distribution, channel heat flux (average and hot), minimum critical heat flux ratio (or minimum critical power ratio), departure from nucleate boiling ratio, vessel water level, thermal power, vessel pressure, steam line pressure (BWR), main steam flow (BWR), and feedwater flow (BWR). The results of the applicant's fuel damage analysis are reviewed by the methods described in SRP Section 4.2 (Ref. 13).4 The sequence of events described in the SAR is reviewed by RSBSRXB. This review is 5 coordinated with the Instrumentation and Controls Systems Branch (ICSB)(HICB). The 6 7 RSBSRXB review concentrates on the need for the reactor protection system, the engineered 8 safety system, and operator action to secure and maintain the reactor in a safe condition. The analytical methods are reviewed by RSBSRXB to ascertain whether the mathematical 9 modeling and computer codes have been previously reviewed and accepted by the staff. If a referenced analytical method has not been previously reviewed, the RSBSRXB reviewer 10 requests initiatesion of a generic evaluation of the new analytical model by the Core Performance Branch (CPB).11 The values of all parameters used in a new analytical model, including the initial conditions of the core and system, are reviewed. It is