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{{Adams
{{Adams
| number = ML082810208
| number = ML003739388
| issue date = 03/01/2009
| issue date = 10/31/1978
| title = Physical Models for Design, and Operation of Hydraulic Structures and Systems for Nuclear Power Plants
| title = Rev 1,Physical Models for Design and Operation of Hydraulic Structures and Systems for Nuclear Power Plants
| author name =  
| author name =  
| author affiliation = NRC/RES
| author affiliation = NRC/RES
Line 9: Line 9:
| docket =  
| docket =  
| license number =  
| license number =  
| contact person = Orr M P/RES/301-415-6373
| contact person =  
| case reference number = DG-1198
| document report number = RG-1.125, Rev 1
| document report number = RG-1.125, Rev. 2
| package number = ML082810194
| document type = Regulatory Guide
| document type = Regulatory Guide
| page count = 4
| page count = 3
}}
}}
{{#Wiki_filter:U.S. NUCLEAR REGULATORY COMMISSION
{{#Wiki_filter:U.S. NUCLEAR REGULATORY COMMISSION
March 2009Revision 2 REGULATORY GUIDE
Revision I
  OFFICE OF NUCLEAR REGULATORY RESEARCH
October 1978 REGULATORY GUIDE  
  The NRC issues regulatory guides to describe and make available to the public methods that the NRC staff considers acceptable for use in implementing specific parts of the agency's regulations, techniques that the staff uses in evaluating specific problems or postulated accidents, and data that the staff needs in reviewing applications for permits and licenses.  Regulatory guides are not substitutes for regulations, and compliance with them is not required.  Methods and solutions that differ from those set forth in regulatory guides will be deemed acceptable if they provide a basis for the findings required for the issuance or continuance of a permit or license by the Commission.
OFFICE OF STANDARDS DEVELOPMENT
REGULATORY GUIDE 1.125 PHYSICAL MODELS FOR DESIGN AND OPERATION
OF HYDRAULIC STRUCTURES AND SYSTEMS FOR NUCLEAR  
POWER PLANTS


This guide was issued after consideration of comments received from the public.
==A. INTRODUCTION==
Paragraph (a) (3) (ii) of §50.34, "Contents of Applications; Technical Information," of 10 CFR
Part 50, "Domestic Licensing of Production and Utilization Facilities," requires that the Preliminary Safety Analysis Report (PSAR) include information on the design bases of the facility and the relation of the design bases to the principal design criteria.
 
Paragraph (a) (4) of §50.34 requires, in part, a preliminary analysis of the adequacy of structures, systems, and components provided for the prevention of accidents and the mitigation of the consequences of accidents.
 
This guide describes the desired coordination of an applicant with the NRC staff and the detail and documentation of data and studies that an applicant should include in the PSAR to support the use of physical hydraulic model testing for predicting per S
formance of safety-related hydraulic structures and systems for nuclear power plants. The regulatory position of this guide is applicable only to physical models used to predict the action or interaction of surface waters with features located outside of con tainment. The recommendations of this guide are not applicable to internal plant systems or structures.
 
The Advisory Committee on Reactor Safeguards has been consulted concerning this guide and has concurred in the regulatory position.
 
==B. DISCUSSION==
Physical hydraulic models are often used to predict prototype performance. They are particularly useful where hydraulic structures and systems are of unusual
* Lines indicate substantive changes from previous issue.
 
design or configuration and hydraulic parameters cannot be adequately evaluated by state-of-the-art analytical methods. Hydraulic models may also be used to establish conservative and reasonable design or operating bases for sites, structures, or systems involving thermal and erosional problems.


Regulatory guides are issued in 10 broad divisions-1, Power Reactors; 2, Research and Test Reactors; 3, Fuels and Materials Facilities; 4, Environmental and Siting; 5, Materials and Plant Protection; 6, Products; 7, Transportation; 8, Occupational Hea lth; 9, Antitrust and Financial Review; and 10, General.
Examples of types of physical modeling studies include, but are not confined to, the following:
1. Intake structures.


Electronic copies of this guide and other recently issued guides are available through the NRC's public Web site under the Regulatory Guides document collection of the NRC's Electronic Reading Room at http://www.nrc.gov/reading rm/doc collections/ and through the NRC's Agencywide Documents Access and Management System (ADAMS) at http://www.nrc.gov/reading rm/adams.html, under Accession No. ML082810208.
2. Discharge structures.


REGULATORY GUIDE 1.125 (Draft was issued as DG-1198, dated May 2008)
3. Energy dissipation structures.
PHYSICAL MODELS FOR DESIGN AND OPERATION OF HYDRAULIC STRUCTURES AND SYSTEMS FOR  NUCLEAR POWER PLANTS 


==A. INTRODUCTION==
4. Spillway and tailwater ratings for dams (waterlevel discharge relations). 
This guide describes the detail and documentation of data and studies that an applicant should include in the preliminary and/or final safety analysis report (PSAR/FSAR) to support the use of physical hydraulic model testing for predicting the performance of hydraulic structures and systems for nuclear power plants that are important to safety. Hydraulic structures are defined as anything that can be used to divert, restrict, stop, or otherwise manage the natural flow of water. The regulatory position of this guide is applicable only to physical models used to predict the action or interaction of surface waters with features located outside the containment. The recommendations of this guide do not apply to internal plant systems or structures.
5. Release of water resulting from dam failures.. 
6. Wave runup, including tsunami effects.
 
7. Stability of structure when exposed to waves and protection therefrom.
 
8. Erosion and deposition in streams and other water bodies and protection therefrom.
 
9. Flow patterns and dispersion of heated or'
contaminated effluents in receiving water bodies.
 
10. Heat dissipation in receiving water bodies.
 
11. Response of moored floating bodies to incident wave systems.
 
12. Response of harbors to waves.
 
It has been the experience of the NRC staff that some applicants have not furnished sufficiently de tailed information on physical hydraulic model studies for.the staff to perform an adequate review. In some instances, staff involvement in the early plan ning of a model study would have resulted in savings.
 
of both NRC and applicant'funds and time in the review and acceptance of the results.
 
Accordingly, the regulatory position describes the USNRC REGULATORY GUIDES
Comments abould be sent to the Secreta*y of the Commison, U.S Nuc USNC
RGUATOY
GIDS
Rguatoy Cmrssan.Washington. D.C. 205 Attention: Dockein and Regulatory Guides are issued to describe and make available to -te public Servic Zranc
 
====h. m alVwDC ====
0%
At~dn r
methods acceptable to the NRC staff of implementing specific peats of the"
Commission's regulations, to delineate techniques usd by the staff in evalu- The guides are issued In the following ten broad divisions:
st specific Woblems oF postulated accidents, of to provide guidance to appelcantL Regulatmy Guides are not substitutes for regulations, and cor-
 
===1. Power ===
. Products plieance with them Is not required. Methods arnd solutions differntfro ths
 
===2. p RHebedTetRatr ===
7 rn r
atitn set out in the guides will be accepta"l if they provide a basis for the findinrs
3. Fuels and Materials Facilities
8 requisite to the issuance or cotnuance of a permit or licens by the  
4. Environmental and Siting
9. Antitrust and Financial Review Commistion.
 
5.
 
& Materals Plant Protoctlot
10. Gnerwal Requests for single copie of Issued guides (which may be repoduced) or for Comments and suggestions for improvements in theae guides eae encouraged at placement on an automatic distribution list for single copias of future guides all times, and guides will be revised, as appropriate, to accommodate comrnents in specific divisions should be made in writing to the US. Nucla egulamry and to reflect new information or exaperience. This guide was revisd as a result Commission, Washington, D.C.


Title 10, Paragraph 50.34(a)(3)(ii), of the Code of Federal Regulations (10 CFR 50.34(a)(3)(ii))  requires that the PSAR include information on the design bases of the facility and the relation of the design bases to the principal design criteria.  In part, 10 CFR 50.34(a)(4) requires a preliminary analysis of the adequacy of structures, systems, and components provided for the prevention of accidents and the mitigation of the consequences of accidents.  Additionally, 10 CFR 52.47(a) and 10 CFR 52.79 describe the required technical content of the final safety analysis report (FSAR) that must accompany applications for early site permits, standard design certifications, and combined licenses for nuclear power plants.
201.


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 Rev. 2 of RG 1.125, Page 2 required to respond to, an information collection request or requirement unless the requesting document displays a currently valid OMB control number.
Attention: Director, Division of of substantive comments received from the public and additional staff review.


==B. DISCUSSION==
Technical Information and Document Control.
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 and reasonable design or operating bases for sites, structures, or systems involving thermal and erosional problems.


Examples of types of physical modeling studies of hydraulic structures and systems for nuclear power plants include, but are not confined to, the following: 
I


* intake structures and pump impeller flow characteristics , 
documentation that should be furnished and the type of coordination bfveen the staff and the applicant that should minimize the time necessary for accept ance of the results of model studies.
* discharge structures, 
* energy and wave dissipation structures, 
* spillway and tailwater ratings for dams (water level and discharge relations), 
* release of water resulting from dam failures,
* wave propagation and runup on a coastal structure, including tsunami effects, 
* stability of structure when exposed to waves and protection from waves, 
* erosion and deposition in streams and other water bodies and protection from these processes,
* flow patterns and dispersion and dissipation of heated or contaminated effluents in receiving water bodies, 
* heat dissipation in receiving water bodies, 
* response of moored floating bodies to incident wave systems, and 
* response of harbors to waves.


The applicant should incorporate the information described in the regulatory position in the PSAR/FSAR as required. However, the staff recognizes that it will not always be possible to incorporate such information in the initial application for a reactor license, since studies of this type may not be undertaken until after the safety analysis report is submitted. Such information may be added to the PSAR/FSAR, either by reference to separate reports or by insertion into the PSAR/FSAR.
The information described in the regulatory posi tion should be incorporated in the PSAR. However, the staff recognizes that it will not always be possible to incorporate such information in the initial applica tion for a construction permit since studies of this type may not be undertaken until after the PSAR is submitted. Such information may, therefore, be added to the PSAR by amendment, either by refer ence to separate reports or by insertion into the PSAR.


==C. REGULATORY POSITION==
==C. REGULATORY POSITION==
Because not all hydraulic design problems can be resolved by the mechanics of similitude and because there are limitations to hydraulic modeling, the applicant should supply the NRC staff with certain documentation for any structural, thermal, erosional, or other physical hydraulic models that it used to establish design or operating bases. The regulatory position contained in this guide applies only to physical models used to predict the action or interaction of surface waters with hydraulic features located outside the containment.
Because not all hydraulic design problems can be resolved by the mechanics of similitude and because there are limitations to hydraulic modeling, the NRC  
staff should be furnished. With certain documentation for any structural, thermal, erosional, or other physi cal hydraulic models used by the applicant to estab lish design or operating bases. The regulatory position contained in this guide *applies only to physical models used to predict the action or interaction of surface waters with safety-related features located outside of containment.
 
Generally, regulatory positions 1 and 3 describe information that should be furnished prior to actual model testing, and regulatory positions 4 through 6 describe information needed after testing' is com pleted. Additionally, partial test results should be provided for staff review and acceptance during the course of testing to ensure reconsideration of parameters whose importance emerges after partial data collection. After completing the entire study, all the information should be consolidated either (1) as a separate report with appropriate reference added in the PSAR or (2) for insertion into the PSAR.
 
1. Prior to construction of the model, the applicant should submit information outlining (a) the problem to be resolved, (b) reasons for selecting the hydraulic model chosen to resolve the problem, (c) expected results to be obtained, (d) a detailed description of the model,' including a description of materials, methods used to measure parameters, scale relations, and other physical characteristics of the model, (e)
methods that will be used to analyze the data obtained from the model studies, and (f) a schedule of expected tests, proposed completion dates, and estimated dates for submittal of information for NRC
staff review.


Rev. 2 of RG 1.125, Page 3 Generally, Regulatory Positions 1 and 2 describe information that should be furnished before the building and testing of the physical model and Regulatory Positions 3 through 5 describe information needed after testing has been completed. It is desirable for the applicant to solicit staff reviews and recommendations before model construction and following or coincident with the submittal of the information listed in Regulatory Position 1, as well as to invite appropriate members of the NRC staff to be present periodically during model testing to observe the performance of the model.  In addition, the applicant should provide partial test results for staff review and acceptance during the course of testing to allow for the consideration of those parameters that partial data collection shows to be important.
2. It is desirable that staff views and recommenda tions be solicited prior to model construction and following ot coincident with the submittal of the information listed in regulatory position 1 and that arrangements also be made for appropriate members of the staff to be present periodically during model operation to observe the actual performance of the model.


1. Regulatory Position 1 Before constructing the physical model, the applicant should submit a test plan that includes the following information:
'3. Furnish documentation on how the various con ditions of geometric, kinematic, dynamic, and ther modynamic 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) have been considered. Because certain forces may act differently in a model than in a prototype, documentation should be provided to jus tify the neglect of any forces by showing that these forces (a) are of negligible magnitude, (b) compen sate for other neglected forces in such a manner that the effects of both are negligible, or (c) are such that their neglect leads to conservative model results and establishment of conservative design or operating bases.


* the problem(s) to be resolved; 
Documentation should be furnished on the methods used to satisfy the equations of similitude in the model. Also document the effects of scale distortions on data obtained from the model studies. Where applicable, model adjustment and verification proce dures should be described, and information should be furnished on the validity of the model over a range of likely flow conditions, heat regimes, atmospheric conditions, and other physical parameters. Where applicable, demonstrate that the model will simulate known flow conditions, and provide this verification when historical data are available.
* reasons for selecting the physical hydraulic model chosen to resolve the problem(s); 
* expected results and how these results will solve the stated problem(s); 
* a detailed description of the model, including a description of materials, instrumentation, and methods used to measure parameters, 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.
4. Where full-scale structures or systems having characteristics similar to those being modeled exist and information relative to the observed or measured performance of the existing structures or systems is available, the physical model results should be com pared with the available information generated by the existing structures. If testing is or has been per formed on existing full-scale structures or systems, such tests and their results should be described.


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 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.
Document the applicability of such tests to the prob lem in question, and discuss any conclusions derived from the tests. If the results of other model tests are used by the applicant, justify the use of these results and verify the ability of these other models to reproduce or predict prototype performance.


3. Regulatory Position 3 Where full-scale structures or systems having characteristics similar to those being modeled exist and information about the observed or measured performance of the existing structures or systems is available, the applicant should compare the physical model results with the available information.  If testing is or has been performed on existing full-scale structures or systems, the applicant should describe such tests and their results.  The document should address the applicability of such tests to the problem in Rev. 2 of RG 1.125, Page 4 question and discuss any conclusions derived from the tests.  If using the results of other model tests, the applicant should justify the use of these results and verify and document the ability of these other models to reproduce or predict prototype performance.
Detailed documentation of data obtained from existing full-scale structures and systems should be provided, including (a) instrumentation used, (b)
description of the data collection network, (c) fre quency of collection, (d) methods of collection, and (e) physical parameters existing at the time of collection, such as heat regimes, flow conditions, and atmospheric conditions.


The applicant should provide detailed documentation of data obtained from existing full-scale structures and systems, including: 
5. Any changes to the original design of the prototypes as a result of the model test should be discussed. Document the designs that were modeled and the basis for modifying the desig


* instrumentation used; 
====n. Undesirable====
* description of the data collection network; 
1.125-2
* frequency of collection; 
* methods of collection; and 
* physical parameters existing at the time of collection, such as heat regimes, flow conditions, and atmospheric conditions.


4. Regulatory Position 4 The applicant should discuss any changes to the original design of the prototypes that result from the model test, documenting the designs that were modeled and the basis for modifying the design.  The discussion should address any undesirable flow characteristics or failure modes for the design tested, as well as any other relevant problems.
flow characteristics or failure modes for the design tested, as well as any other problems, should be discussed.


5. Regulatory Position 5 The report covering the completed model tests should provide the data obtained from the tests, as well as the (1) instrumentation used, (2) description of the data collection network, (3) frequency of collection, and (4) method of collection. Figures, drawings, photographs, and text submitted as documentation for Regulatory Positions 2, 3, and 4 should be sufficiently detailed to allow the staff to evaluate independently the applicability of the model to the design problem in question. This report will provide the basis for the interpretation of model results and for any conclusions reached. The applicant should not dismantle the models until the staff has reviewed the submittals.  Preserving the model for a maximum of 1 year after the submission of the model documentation to the NRC will be acceptable in most cases.
6. The report covering the completed model tests should include (a) instrumentation used, (b) descrip tion of the data collection network, (c) frequency of collection, and (d) method of collection. Figures, drawings, photographs, and text submitted as documentation for regulatory positions 3, 4, and 5 should be provided in sufficient detail to allow the staff to evaluate independently the applicability of the model to the design problem in question. (A typical model investigation reportI as published by the U.S.
 
Army Waterways Experiment Station has been found acceptable in the past.) Provide bases for the 'in terpretation of model results and for any conclusions  
'Further information may be obtained by writing to the Com mander and Director, U.S. Army Engineer Waterways Experi ment Station, Corps of Engineers, P.O. Box 631, Vicksburg, Mississippi 39180.
 
reached. In many instances, it may be advisable to provide partial test results for review. The models should not be dismantled 2 until the staff has re viewed the submittals.


==D. IMPLEMENTATION==
==D. IMPLEMENTATION==
The purpose of this section is to provide information to applicants and licensees regarding the NRC's plans for using this regulatory guide. The NRC does not intend or approve any imposition or backfit in connection with its issuance.
The purpose of this section is to provide informa tion to applicants regarding the NRC staff's plans for using this regulatory guide.
 
This guide reflects current NRC practice. There fore, except in those cases in which the, applicant proposes an acceptable alternative method for :com plying with specified portions of the Commission's regulations, the method described herein will be used in the evaluation of submittals for construction permit applications until this guide is revised as a result 9f suggestions from the public or additional staff review.
 
2 Preserving the model for a maximum of one year will be acceptable in most cases.


In some cases, applicants or licensees may propose or use a previously established acceptable alternative method for complying with specified portions of the NRC's regulations.  Otherwise, the methods described in this guide will be used in evaluating compliance with the applicable regulations for license applications, license amendment applications, and amendment requests.}}
1.125-3 I}}


{{RG-Nav}}
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Latest revision as of 02:10, 17 January 2025

Rev 1,Physical Models for Design and Operation of Hydraulic Structures and Systems for Nuclear Power Plants
ML003739388
Person / Time
Issue date: 10/31/1978
From:
Office of Nuclear Regulatory Research
To:
References
RG-1.125, Rev 1
Download: ML003739388 (3)
v • d • e


U.S. NUCLEAR REGULATORY COMMISSION

Revision I

October 1978 REGULATORY GUIDE

OFFICE OF STANDARDS DEVELOPMENT

REGULATORY GUIDE 1.125 PHYSICAL MODELS FOR DESIGN AND OPERATION

OF HYDRAULIC STRUCTURES AND SYSTEMS FOR NUCLEAR

POWER PLANTS

A. INTRODUCTION

Paragraph (a) (3) (ii) of §50.34, "Contents of Applications; Technical Information," of 10 CFR

Part 50, "Domestic Licensing of Production and Utilization Facilities," requires that the Preliminary Safety Analysis Report (PSAR) include information on the design bases of the facility and the relation of the design bases to the principal design criteria.

Paragraph (a) (4) of §50.34 requires, in part, a preliminary analysis of the adequacy of structures, systems, and components provided for the prevention of accidents and the mitigation of the consequences of accidents.

This guide describes the desired coordination of an applicant with the NRC staff and the detail and documentation of data and studies that an applicant should include in the PSAR to support the use of physical hydraulic model testing for predicting per S

formance of safety-related hydraulic structures and systems for nuclear power plants. The regulatory position of this guide is applicable only to physical models used to predict the action or interaction of surface waters with features located outside of con tainment. The recommendations of this guide are not applicable to internal plant systems or structures.

The Advisory Committee on Reactor Safeguards has been consulted concerning this guide and has concurred in the regulatory position.

B. DISCUSSION

Physical hydraulic models are often used to predict prototype performance. They are particularly useful where hydraulic structures and systems are of unusual

  • Lines indicate substantive changes from previous issue.

design or configuration and hydraulic parameters cannot be adequately evaluated by state-of-the-art analytical methods. Hydraulic models may also be used to establish conservative and reasonable design or operating bases for sites, structures, or systems involving thermal and erosional problems.

Examples of types of physical modeling studies include, but are not confined to, the following:

1. Intake structures.

2. Discharge structures.

3. Energy dissipation structures.

4. Spillway and tailwater ratings for dams (waterlevel discharge relations).

5. Release of water resulting from dam failures..

6. Wave runup, including tsunami effects.

7. Stability of structure when exposed to waves and protection therefrom.

8. Erosion and deposition in streams and other water bodies and protection therefrom.

9. Flow patterns and dispersion of heated or'

contaminated effluents in receiving water bodies.

10. Heat dissipation in receiving water bodies.

11. Response of moored floating bodies to incident wave systems.

12. Response of harbors to waves.

It has been the experience of the NRC staff that some applicants have not furnished sufficiently de tailed information on physical hydraulic model studies for.the staff to perform an adequate review. In some instances, staff involvement in the early plan ning of a model study would have resulted in savings.

of both NRC and applicant'funds and time in the review and acceptance of the results.

Accordingly, the regulatory position describes the USNRC REGULATORY GUIDES

Comments abould be sent to the Secreta*y of the Commison, U.S Nuc USNC

RGUATOY

GIDS

Rguatoy Cmrssan.Washington. D.C. 205 Attention: Dockein and Regulatory Guides are issued to describe and make available to -te public Servic Zranc

h. m alVwDC

0%

At~dn r

methods acceptable to the NRC staff of implementing specific peats of the"

Commission's regulations, to delineate techniques usd by the staff in evalu- The guides are issued In the following ten broad divisions:

st specific Woblems oF postulated accidents, of to provide guidance to appelcantL Regulatmy Guides are not substitutes for regulations, and cor-

1. Power

. Products plieance with them Is not required. Methods arnd solutions differntfro ths

2. p RHebedTetRatr

7 rn r

atitn set out in the guides will be accepta"l if they provide a basis for the findinrs

3. Fuels and Materials Facilities

8 requisite to the issuance or cotnuance of a permit or licens by the

4. Environmental and Siting

9. Antitrust and Financial Review Commistion.

5.

& Materals Plant Protoctlot

10. Gnerwal Requests for single copie of Issued guides (which may be repoduced) or for Comments and suggestions for improvements in theae guides eae encouraged at placement on an automatic distribution list for single copias of future guides all times, and guides will be revised, as appropriate, to accommodate comrnents in specific divisions should be made in writing to the US. Nucla egulamry and to reflect new information or exaperience. This guide was revisd as a result Commission, Washington, D.C.

201.

Attention: Director, Division of of substantive comments received from the public and additional staff review.

Technical Information and Document Control.

I

documentation that should be furnished and the type of coordination bfveen the staff and the applicant that should minimize the time necessary for accept ance of the results of model studies.

The information described in the regulatory posi tion should be incorporated in the PSAR. However, the staff recognizes that it will not always be possible to incorporate such information in the initial applica tion for a construction permit since studies of this type may not be undertaken until after the PSAR is submitted. Such information may, therefore, be added to the PSAR by amendment, either by refer ence to separate reports or by insertion into the PSAR.

C. REGULATORY POSITION

Because not all hydraulic design problems can be resolved by the mechanics of similitude and because there are limitations to hydraulic modeling, the NRC

staff should be furnished. With certain documentation for any structural, thermal, erosional, or other physi cal hydraulic models used by the applicant to estab lish design or operating bases. The regulatory position contained in this guide *applies only to physical models used to predict the action or interaction of surface waters with safety-related features located outside of containment.

Generally, regulatory positions 1 and 3 describe information that should be furnished prior to actual model testing, and regulatory positions 4 through 6 describe information needed after testing' is com pleted. Additionally, partial test results should be provided for staff review and acceptance during the course of testing to ensure reconsideration of parameters whose importance emerges after partial data collection. After completing the entire study, all the information should be consolidated either (1) as a separate report with appropriate reference added in the PSAR or (2) for insertion into the PSAR.

1. Prior to construction of the model, the applicant should submit information outlining (a) the problem to be resolved, (b) reasons for selecting the hydraulic model chosen to resolve the problem, (c) expected results to be obtained, (d) a detailed description of the model,' including a description of materials, methods used to measure parameters, scale relations, and other physical characteristics of the model, (e)

methods that will be used to analyze the data obtained from the model studies, and (f) a schedule of expected tests, proposed completion dates, and estimated dates for submittal of information for NRC

staff review.

2. It is desirable that staff views and recommenda tions be solicited prior to model construction and following ot coincident with the submittal of the information listed in regulatory position 1 and that arrangements also be made for appropriate members of the staff to be present periodically during model operation to observe the actual performance of the model.

'3. Furnish documentation on how the various con ditions of geometric, kinematic, dynamic, and ther modynamic 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) have been considered. Because certain forces may act differently in a model than in a prototype, documentation should be provided to jus tify the neglect of any forces by showing that these forces (a) are of negligible magnitude, (b) compen sate for other neglected forces in such a manner that the effects of both are negligible, or (c) are such that their neglect leads to conservative model results and establishment of conservative design or operating bases.

Documentation should be furnished on the methods used to satisfy the equations of similitude in the model. Also document the effects of scale distortions on data obtained from the model studies. Where applicable, model adjustment and verification proce dures should be described, and information should be furnished on the validity of the model over a range of likely flow conditions, heat regimes, atmospheric conditions, and other physical parameters. Where applicable, demonstrate that the model will simulate known flow conditions, and provide this verification when historical data are available.

4. Where full-scale structures or systems having characteristics similar to those being modeled exist and information relative to the observed or measured performance of the existing structures or systems is available, the physical model results should be com pared with the available information generated by the existing structures. If testing is or has been per formed on existing full-scale structures or systems, such tests and their results should be described.

Document the applicability of such tests to the prob lem in question, and discuss any conclusions derived from the tests. If the results of other model tests are used by the applicant, justify the use of these results and verify the ability of these other models to reproduce or predict prototype performance.

Detailed documentation of data obtained from existing full-scale structures and systems should be provided, including (a) instrumentation used, (b)

description of the data collection network, (c) fre quency of collection, (d) methods of collection, and (e) physical parameters existing at the time of collection, such as heat regimes, flow conditions, and atmospheric conditions.

5. Any changes to the original design of the prototypes as a result of the model test should be discussed. Document the designs that were modeled and the basis for modifying the desig

n. Undesirable

1.125-2

flow characteristics or failure modes for the design tested, as well as any other problems, should be discussed.

6. The report covering the completed model tests should include (a) instrumentation used, (b) descrip tion of the data collection network, (c) frequency of collection, and (d) method of collection. Figures, drawings, photographs, and text submitted as documentation for regulatory positions 3, 4, and 5 should be provided in sufficient detail to allow the staff to evaluate independently the applicability of the model to the design problem in question. (A typical model investigation reportI as published by the U.S.

Army Waterways Experiment Station has been found acceptable in the past.) Provide bases for the 'in terpretation of model results and for any conclusions

'Further information may be obtained by writing to the Com mander and Director, U.S. Army Engineer Waterways Experi ment Station, Corps of Engineers, P.O. Box 631, Vicksburg, Mississippi 39180.

reached. In many instances, it may be advisable to provide partial test results for review. The models should not be dismantled 2 until the staff has re viewed the submittals.

D. IMPLEMENTATION

The purpose of this section is to provide informa tion to applicants regarding the NRC staff's plans for using this regulatory guide.

This guide reflects current NRC practice. There fore, except in those cases in which the, applicant proposes an acceptable alternative method for :com plying with specified portions of the Commission's regulations, the method described herein will be used in the evaluation of submittals for construction permit applications until this guide is revised as a result 9f suggestions from the public or additional staff review.

2 Preserving the model for a maximum of one year will be acceptable in most cases.

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