Document: NUREG-0800
Document ID: 2bca792d-0e88-4e2d-b437-be572ed57a48
Document Type: srp
Title: REVIEW OF TRANSIENT AND ACCIDENT ANALYSIS METHODS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0708/ML070820123.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.0.2
CFR Part: 
CFR Title: 

Content:
ps, 15.0.2-7 March 2007 numerical solution techniques, and simplifications and approximations (including limitations) inherent in the chosen field equations and numerical methods. The reviewers should also confirm that the theory manual identifies the pedigree or origin of closure relationships used in the code and the limits of applicability for all models in the code. The reviewers should confirm that the user manual provides guidance for selecting or calculating all input parameters and code options. The guidance must be clear and unambiguous. As a result of the code development or review process many code options may be determined to be inappropriate for specific licensing calculations. The reviewers should confirm that the guidance in the manual specifies the required and acceptable code options for the specific licensing calculations. The reviewers should also confirm that required input settings are hardwired into the input processor so that the code stops with an error message if the required input is not provided or if the input is not within an acceptable range of values or that administrative controls ( an independent reviewer QA check) are in place that accomplish the same purpose. The reviewers should confirm that computer codes that are used for multiple accidents and transients include guidelines that are specific to each transient or accident. Code assessment cases can be examined to ensure that the modeling used in the assessment cases is consistent with the user guidelines. B. Evaluation Model. The reviewers should determine whether the mathematical modeling and computer codes used to analyze the transient or accident have been previously reviewed and accepted. For changes to previously approved models, the reviewers can limit their review to the new material if they determine that there is nothing new that will invalidate the previous approval, including the range of applicability for the analysis method. Otherwise the entire model must be