Document: NRC Regulatory Guide
Document ID: 6ab6a5e8-47ac-40c0-8c91-837b4e6f0026
Document Type: regulatory_guide
Title: Physical Models for Design and Operation of Hydraulic Structures and Systems for Nuclear Power Plants + HISTORY – HISTORY 09/2014 – Periodic Review of Revision 2 – Reviewed with issues for future consideration 03/2009 – Periodic Review of Revision 1 – Revise 07/2008 – DG-1198 , Proposed Revision 2 (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0810/ML081080301.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.125
CFR Part: 
CFR Title: 

Content:
meters, including resolution and error of instrumentation, scale relations, and other physical characteristics of the model; • a detailed description of the testing facilities; • methods that will be used to analyze the data obtained from the model studies; and • a schedule of expected tests, including proposed start and completion dates, and estimated dates for submitting information for NRC staff review. 2. Regulatory Position 2 In addition, the applicant should furnish documentation describing how it considered the various conditions of geometric, kinematic, dynamic, and thermodynamic similitude that take into account the physical properties and flow state of the fluid (i.e., Froude, Reynolds, Euler, Cauchy, Weber, and other related numbers). Because certain forces may act differently in a model than in a prototype, the documentation provided should justify the neglect of any forces by showing that these forces (1) are of negligible magnitude, (2) compensate for other neglected forces in such a manner that the effects of both forces are negligible, or (3) are such that their neglect leads to conservative model results and the establishment of conservative design or operating bases. The applicant should document the methods used to satisfy the equations of similitude in the model and the effects of scale distortions on data obtained from the model studies. Where applicable, the document should describe model adjustment and verification procedures and furnish information on the validity of the model over a range of likely flow conditions, heat regimes, atmospheric conditions, and DG-1198, Page 4 other physical parameters. The document should demonstrate, where applicable, that the model will simulate known flow conditions and provide this verification when measured historical data are available. 3. Regulatory Position 3 Where full-scale structures or systems having characteristics similar to those being modeled exist and information about the observed or