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:
at http://www.nrc.gov/reading rm/doc collections/cfr/. Copies are also available for inspection or copying for a fee from the NRC’s Public Document Room (PDR) at 11555 Rockville Pike, Rockville, MD; the mailing address is USNRC PDR, Washington, DC 20555; telephone (301) 415-4737 or (800) 397-4209; fax (301) 415 3548; and email PDR@nrc.gov. DG-1198, Page 2 The NRC issues regulatory guides to describe to the public methods that the staff considers acceptable for use in implementing specific parts of the agency’s regulations, to explain techniques that the staff uses in evaluating specific problems or postulated accidents, and to provide guidance to applicants. Regulatory guides are not substitutes for regulations and compliance with them is not required. This regulatory guide contains information collection requirements covered by 10 CFR Parts 50 and 52 that the Office of Management and Budget (OMB) approved under OMB control numbers 3150- 0011 and 3150-0151 respectively. The NRC may neither conduct nor sponsor, and a person is not required to respond to, an information collection request or requirement unless the requesting document displays a currently valid OMB control number. B. DISCUSSION Physical hydraulic models are often used to predict prototype performance in designing and rehabilitating hydraulic structures. The physical modeling studies ultimately increase the safety of the hydraulic structures by identifying and eliminating potential problems, thus reducing construction and maintenance costs. They are particularly useful where hydraulic structures and systems are of unusual design or configuration and hydraulic parameters cannot be adequately evaluated by state-of-the-art analytical or computational methods. Furthermore, physical models will incorporate the appropriate governing equations without the simplifying assumptions that are often necessary in analytical or numerical models. Physical hydraulic models may also be used to establish conservative