Regulatory Guide 1.125: Difference between revisions

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{{Adams
{{Adams
| number = ML082810208
| number = ML13350A272
| issue date = 03/01/2009
| issue date = 03/31/1977
| title = Physical Models for Design, and Operation of Hydraulic Structures and Systems for Nuclear Power Plants
| title = 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/OSD
| addressee name =  
| addressee name =  
| addressee affiliation =  
| addressee affiliation =  
| 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
| 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                                                 March 2009 Revision 2 REGULATORY GUIDE
{{#Wiki_filter:yRt      REG&, 9
                                OFFICE OF NUCLEAR REGULATORY RESEARCH
                        0            U.S. NUCLEAR REGULATORY COMMISSION                                                                                                                   March 1977 REGULATORY GUIDE
                                    REGULATORY GUIDE 1.125 (Draft was issued as DG-1198, dated May 2008)
                                    OFFICE OF STANDARDS DEVELOPMENT
      PHYSICAL MODELS FOR DESIGN AND OPERATION OF
                                                                            REGULATORY GUIDE 1.125 PHYSICAL MODELS FOR DESIGN AND OPERATION
                HYDRAULIC STRUCTURES AND SYSTEMS FOR
                                      OF HYDRAULIC STRUCTURES AND SYSTEMS FOR NUCLEAR
                                    NUCLEAR POWER PLANTS
                                                                                      POWER PLANTS


==A. INTRODUCTION==
==A. INTRODUCTION==
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.
Examples of types of physical modeling studies in- clude, but are not confined to, the following:
      Paragraph (a) (3) (ii) of §50.34, "Contents of Ap- plications; Technical Information," of 10 CFR Part                                                          I. Intake structures.


Title 10, Paragraph 50.34(a)(3)(ii), of the Code of Federal Regulations (10 CFR 50.34(a)(3)(ii))
50, "Licensing of Production and Utilization                                                                2.   Discharge structures.
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.


This regulatory guide contains information collection requirements covered by 10 CFR Parts 50
Facilities," requires that the Preliminary Safety                                                          3.   Energy dissipation structures.
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 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 agencys 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.


This guide was issued after consideration of comments received from the public.
Analysis Report (PSAR) include information on the                                                          4.    Spillway and tailwater ratings for (dWrs (water- design bases of the facility and the relation of the                                                    level discharge relations).
design bases to the principal design criteria.                                                              5. Release of water resulting from daiii'lures.


Regulatory guides are issued in 10 broad divisions1, 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 Health;
Paragraph (a) (4) of §50.34 requires, in part, a pre-                                                      6. Wave runup, including ounaAi',effect'
9, Antitrust and Financial Review; and 10, General.
liminary analysis of the adequacy of structures,                                                           7. Erosion from waves..and,.rtbilaotin therefrom.


Electronic copies of this guide and other recently issued guides are available through the NRCs public Web site under the Regulatory Guides document collection of the NRCs Electronic Reading Room at http://www.nrc.gov/reading rm/doc collections/ and through the NRCs Agencywide Documents Access and Management System (ADAMS) at http://www.nrc.gov/reading rm/adams.html, under Accession No. ML082810208.
systems, and comnonents orovided for the prevention                                                          8. Erosion and deppo8io'n in.i                              *6trecamiis and other sysems            and     component          --.
of accidents and the mwttgation of the consequencesprvie  ..     . for.


required to respond to, an information collection request or requirement unless the requesting document displays a currently valid OMB control number.
.... h-  '-.      .....            aenb .      .....
                                                                                                                          desadtrt  and        r:          ..
                                                                                                                                                            tooheno      eerom          ., *th of accidents.                              mittonfts                                                        9. Flow pattersand d(pettion of heated or con- taminated
                                                                                                          10. Heat'Al'sý    effluerit*i IK i&"recci'6ing n-" receivingwater          water      bodies.


==B. DISCUSSION==
bodies.
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:
This guide describes the desired coordination of an                                                  10. Ha                                .            r applicant with the NRC staff and the detail and                                                                              eerienceex                                of the NRC staff that documentation of data and studies that. an applicant                                                    sozpe '                ican6 have not furnished sufficiently should include in the PSAR to support the use of                                                        detidic "'i.r' mation on physical hydraulic model physical hydraulic model testing for predicting per                                                    sd*iiA*r the staff to perform an adequate review. In formance of hydraulic structures and systems 4*r t .so~,-4instances, staff involvement in the early plan- nuclear power plants. The regulatory position of i~is                                                "T,%ing of a mcdel study would have resulted in savings guide is applicable only to physical mo~elt"Osedlo, gOf both NRC and applicant funds and time in the predict the action or interaction of su .Uce waterV` review and acceptance of the results.
*       intake structures and pump impeller flow characteristics ,
*       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.
with features located outside of contaiihtent.1 The recommendations of this guide are not ppoa                                                  e to          Accordingly, the regulatory position details the internal plant systems or stuctures.                                                                    documentation that should be furnished and the type of coordination between the staff and the applicant that should minimize the time necessary for accep-
                                          .*, ,,.tance                                                              of the results of model studies.
 
Physical hydr 1i ml els' te often used to predict                                                      The information described in the regulatory posi- prototype                    o          nce. hey are particularly useful                                tion should be incorporated in the PSAR. However, where h a                                        res and systems are of un-                            the staff recognizes that it will not always be possible usual de                        or configuration and hydraulic                                        to incorporate such information in the initial applica- parameters                    not be adequately evaluated by state-                                    tion for a construction permit since studies of this of-the-art analytical methods. Hydraulic models may                                                    type may not be undertaken until after the PSAR is also be used to establish conservative and reasonable                                                  submitted. Such information may, therefore, be add- design or operating bases for sites, structures, or                                                    ed to the PSAR by amendment, either by reference to systems involving thermal and erosional problems.                                                      separate reports or by insertion into the PSAR.
 
USNRC RE.GUL.ATORY GUIDES                                                    Cotenmeeet.    %hureild bee wnt to t he S--Cletry eII IIe-Creen,e,,eoy.reeUS. Ni.1a                  -,ij Regutlatory Guidieaed.C twed to iesvrilte antdmalte availablte to the, ptublic method,              Ilaoty Ce,e  ....... awo. Vi,)Ii tee,', D.C. 7D~bV,. Ate.,I,ete                          Ntn eed L)-e 1e,nel, acceptable to the NRC staff ol imtlementie'j uiiecetec parts of the Cenlor,$inss~~,                  feee regulIatieons, to deliea~tetdt Ichetetteecl ,tivdlItyth! stalfi cc tvalai nat stjwtecolc problemees  Theuiesa            sejtc t. ttecvt              eeteetlIviecc or postolittO accidenti. or itt ittovde! guitdance to .tttttlicints. R.rgulatory Guide%                h-qi.sie"uII                  n ol~-            e areC not substnlesu for *eifulmitons. and ConneteleieCe            Withethem, is not triltuirtd.      I PectvtIie-ectnr                                        G midc,ele;ro Metthods atot solntlotv' dillefecnt from lholit, set ou!to        i  Mc jetguide%will hee Ancmil-        Ffesi,...icnited Tot      tetecci                    1. ' awer~ltc able .1 they ttoe idt, a1btasis It the.findeings rentuisite In, the ifsueinci!et Col co~ntnance.          V fl    ,ecc.1,,!mt Ite        lstF.1,tcttin, w%                      Qe8 ccttet      I t.01thr of a Petmit or license by the Comcmission.                                                            .1, Erivifortcnce-mtit adSt ctl      tnq                          ete t f)lc,-"e
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==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.
effects of both are negligible, or (c) are such that their neglect leads to conservative model results and es- Because all hydraulic design problems cannot be             tablishmen.t of conservative 'design or operating resolved by the mechanics of similitude and because             bases.


Rev. 2 of RG 1.125, Page 2
there are limitations to hydraulic modeling.'the NRC
        staff should be furnished with certain documentation                  Documentation should be furnished on the


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.
* for any structural, thermal, erosional,I or other                methods used to satisfy the equations of similitude in physicalhydraulic models used by the applicant to es-          the model. The effects of scale distortions on data ob- tablish design or operating bases. The regulatory              tained from the model studies should be documented.


1.      Regulatory Position 1 Before constructing the physical model, the applicant should submit a test plan that includes the following information:
*position contained in this guide applies only to                 Where applicable, model adjustment and verification
*       the problem(s) to be resolved;
      'physical models used to predict the action or interac-          procedures should be described, and information tion of surface waters with features located outside of         should be furnished on the validity of the model over containment.                                                    a range of likely flow conditions, heat regimes, at- mospheric conditions, and other physical parameters.
*        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.
Generally, regulatory positions I and 3 describe in-        Where applicable, it should be demonstrated that the formation that should be furnished prior to actual              model will simulate known flow conditions; this ver- model testing., and regulatory positions 4 through 6            ification should be provided when historical data are describe information needed after testing is com-              available.


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.
pleted. Additionally, partial test results should be
*      provided for staff review and acceptance during the               4. Where full-scale structures or systems having


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 3
* course of testing to ensure reconsideration of                    characteristics similar to those being modeled exist


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.
* parameters whose importance becomes apparent on                    and information relative to the observed or measured the basis of partial data collection. After completing          performance of the existingstructures or systems is the entire study, all the information should be con-            available, the physical model results should be com- solidated either (1) as a separate report with ap-              pared with the available information generated by the
*      propriate reference added in the PSAR or (2) for in-            existing structures. Testing performed on existing sertion into the PSAR.                                          full-scale structures or systems and the results of these tests should be describe


The applicant should provide detailed documentation of data obtained from existing full-scale structures and systems, including:
====d. The applicability of====
*        instrumentation used;
          1. Prior to construction of the model, the appli-            such tests to the problem in question should be
*        description of the data collection network;
*        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.
* cant should submit information outlining (a) the                  documented, and any conclusions derived from the
*      problem to be resolved, (b) reasons for selecting the            tests should be discussed. If the results of other model
*
.
      hydraulic model chosen to resolve the problem, (c)
      expected results to be obtained, (d) a detailed descrip- tion of the model, including a description of materials, methods used to measure parameters, scale tests are used by the applicant, justification for the use of these results and verification of the ability of these other models to reproduce or predict prototype performance should also be provided.


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.
0
      relations, and other physical characteristics of the model, (e) methods that will be used to analyze the                   Detailed documentation of data obtained from
 
* data obtained from the model studies, and (0 a                    existing full-scale structures and systems should be schedule of expected tests, proposed completion                  provided, including (a) instrumentation used, (b)
      dates, and estimated dates for submittal of informa-              description of the data collection network, (c) fre-
 
* tion for NRC staff review.                                        quency of collection,. (d) methods of collection, and (e) physical parameters existing at the time of collec-
          2. Staff views and recommendations should be                tion, such as heat regimes, flow conditions, and at- solicited prior to model construction and following              mospheric conditions.
 
or coincident with the submittal of the information
*      listed in regulatory position 1, and arrangements                    5. Any changes to the original design of the should also be made for appropriate members of the                prototypes as a result of the model test should be dis- staff to be present periodically during model opera-              cussed. The designs that were modeled and the basis tion to observe the actual performance of the model.              for modifying the design should be documented.
 
Undesirable flow characteristics or failure modes for
          3. Documentation should be furnished on how the              the design tested, as well as any oiihcr problems, various conditions of geometric, kinematic, dynamic,              should be discussed.
 
and thermodynamic.similitude that take into account
      .the physical properties and flow state of the fluid (i.e,.          -6. Figures. drawings, photographs, and text sub- Froude, Reynolds, Euler, Cauchy, Weber, and other                mitted as documentation for regulatory positions 3, related numbers) have been considered. Because-cer-              4, and 5 should be provided in sufficient detail to al- tain forces may act differently in a model than in a              low the staff to evaluate independently the ap- prototype, documentation should be provided to                    plicability of the model to the design problem in justify the neglect of any forces by showing that these          question. (A typical model investigation report as forces (a) are of negligible magnitude, (b) compensate            published by the U.S. Army Waterways Experiment for other neglected forces in such a manner that the              Station has been found acceptable in the past.) Bases
                                                                  1.125-2
 
for the interpretation of model results and for any         Except in those cases in which the applicant conclusions reached should be provided. In many in-      proposes an acceptable alternative method for com- stances, it may be advisable to provide partial test      plying with specified portions of the Commission's results for review. The models should not be dis-        regulations, the method described herein will be used mantled until the staff has reviewed the submittals.     in the evaluation of submittals for construction per- mit applications docketed after November 1, 1977. If


==D. IMPLEMENTATION==
==D. IMPLEMENTATION==
The purpose of this section is to provide information to applicants and licensees regarding the NRCs plans for using this regulatory guide. The NRC does not intend or approve any imposition or backfit in connection with its issuance.
an applicant wishes to use this regulatory guide in developing submittals for construction permit ap- The purpose of this section is to provide informa-    plications docketed on or before November 1, 1977, tion to license applicants regarding the NRC staff's      the pertinent portions of the application will be plans for implementing this regulatory guide.             evaluated on the basis of this guide.
 
In some cases, applicants or licensees may propose or use a previously established acceptable alternative method for complying with specified portions of the NRCs 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.


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Physical Models for Design and Operation of Hydraulic Structures and Systems for Nuclear Power Plants
ML13350A272
Person / Time
Issue date: 03/31/1977
From:
NRC/OSD
To:
References
RG-1.125
Download: ML13350A272 (3)
v • d • e


yRt REG&, 9

0 U.S. NUCLEAR REGULATORY COMMISSION March 1977 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

Examples of types of physical modeling studies in- clude, but are not confined to, the following:

Paragraph (a) (3) (ii) of §50.34, "Contents of Ap- plications; Technical Information," of 10 CFR Part I. Intake structures.

50, "Licensing of Production and Utilization 2. Discharge structures.

Facilities," requires that the Preliminary Safety 3. Energy dissipation structures.

Analysis Report (PSAR) include information on the 4. Spillway and tailwater ratings for (dWrs (water- design bases of the facility and the relation of the level discharge relations).

design bases to the principal design criteria. 5. Release of water resulting from daiii'lures.

Paragraph (a) (4) of §50.34 requires, in part, a pre- 6. Wave runup, including ounaAi',effect'

liminary analysis of the adequacy of structures, 7. Erosion from waves..and,.rtbilaotin therefrom.

systems, and comnonents orovided for the prevention 8. Erosion and deppo8io'n in.i *6trecamiis and other sysems and component --.

of accidents and the mwttgation of the consequencesprvie .. . for.

.... h- '-. ..... aenb . .....

desadtrt and r: ..

tooheno eerom ., *th of accidents. mittonfts 9. Flow pattersand d(pettion of heated or con- taminated

10. Heat'Al'sý effluerit*i IK i&"recci'6ing n-" receivingwater water bodies.

bodies.

This guide describes the desired coordination of an 10. Ha . r applicant with the NRC staff and the detail and eerienceex of the NRC staff that documentation of data and studies that. an applicant sozpe ' ican6 have not furnished sufficiently should include in the PSAR to support the use of detidic "'i.r' mation on physical hydraulic model physical hydraulic model testing for predicting per sd*iiA*r the staff to perform an adequate review. In formance of hydraulic structures and systems 4*r t .so~,-4instances, staff involvement in the early plan- nuclear power plants. The regulatory position of i~is "T,%ing of a mcdel study would have resulted in savings guide is applicable only to physical mo~elt"Osedlo, gOf both NRC and applicant funds and time in the predict the action or interaction of su .Uce waterV` review and acceptance of the results.

with features located outside of contaiihtent.1 The recommendations of this guide are not ppoa e to Accordingly, the regulatory position details the internal plant systems or stuctures. documentation that should be furnished and the type of coordination between the staff and the applicant that should minimize the time necessary for accep-

.*, ,,.tance of the results of model studies.

Physical hydr 1i ml els' te often used to predict The information described in the regulatory posi- prototype o nce. hey are particularly useful tion should be incorporated in the PSAR. However, where h a res and systems are of un- the staff recognizes that it will not always be possible usual de or configuration and hydraulic to incorporate such information in the initial applica- parameters not be adequately evaluated by state- tion for a construction permit since studies of this of-the-art analytical methods. Hydraulic models may type may not be undertaken until after the PSAR is also be used to establish conservative and reasonable submitted. Such information may, therefore, be add- design or operating bases for sites, structures, or ed to the PSAR by amendment, either by reference to systems involving thermal and erosional problems. separate reports or by insertion into the PSAR.

USNRC RE.GUL.ATORY GUIDES Cotenmeeet. %hureild bee wnt to t he S--Cletry eII IIe-Creen,e,,eoy.reeUS. Ni.1a -,ij Regutlatory Guidieaed.C twed to iesvrilte antdmalte availablte to the, ptublic method, Ilaoty Ce,e ....... awo. Vi,)Ii tee,', D.C. 7D~bV,. Ate.,I,ete Ntn eed L)-e 1e,nel, acceptable to the NRC staff ol imtlementie'j uiiecetec parts of the Cenlor,$inss~~, feee regulIatieons, to deliea~tetdt Ichetetteecl ,tivdlItyth! stalfi cc tvalai nat stjwtecolc problemees Theuiesa sejtc t. ttecvt eeteetlIviecc or postolittO accidenti. or itt ittovde! guitdance to .tttttlicints. R.rgulatory Guide% h-qi.sie"uII n ol~- e areC not substnlesu for *eifulmitons. and ConneteleieCe Withethem, is not triltuirtd. I PectvtIie-ectnr G midc,ele;ro Metthods atot solntlotv' dillefecnt from lholit, set ou!to i Mc jetguide%will hee Ancmil- Ffesi,...icnited Tot tetecci 1. ' awer~ltc able .1 they ttoe idt, a1btasis It the.findeings rentuisite In, the ifsueinci!et Col co~ntnance. V fl ,ecc.1,,!mt Ite lstF.1,tcttin, w% Qe8 ccttet I t.01thr of a Petmit or license by the Comcmission. .1, Erivifortcnce-mtit adSt ctl tnq ete t f)lc,-"e

5r Mate, e.0,ine Ptan)tNolvotC "

~Cormnians antd suggestions for itilltrnvetntent% in theso (euieetle ntt! etcncuraged at ;,I[

gitime's,.ntrwgoiei "Melt It evi"Icl .s te, in ltnuette.tt, to atcecrtto,ilitt ctttlflenrtt and~t tle4tectt Iwe lecele ccitfe te seee tMteej,

4 erhe cee.ehi.e~eeute or let, tela,;'

to rei edl fee. intotint Ieon ot et !I net'C,, Hoeweve~r, cornenerreotth!itts luetle.,it eeee~t 'ten teeiutomtmtc n:e dtieteeul etetetlee I ecte Cite'! ' tet leeee! n.e'ett ltitne, eefi teceivedlvvethin abeout ty. ioi ,,~hs titer its oletincc. vvil lee ttaelicntar,tl eestt~leto tleeeetoet quittet Itw netteoin eteteti tee tte U S. ~tel-ec.,,,

tllqeetdnty Cetettcowaeeee evileeetetIltnatl It e *.tyttefUt Vdtlitnhmtttt, D.C. 205fbh. At t,-niut .e Deeq feor. Dionuienr etf Uttinpritn Cultectol.

C. REGULATORY POSITION

effects of both are negligible, or (c) are such that their neglect leads to conservative model results and es- Because all hydraulic design problems cannot be tablishmen.t of conservative 'design or operating resolved by the mechanics of similitude and because bases.

there are limitations to hydraulic modeling.'the NRC

staff should be furnished with certain documentation Documentation should be furnished on the

  • for any structural, thermal, erosional,I or other methods used to satisfy the equations of similitude in physicalhydraulic models used by the applicant to es- the model. The effects of scale distortions on data ob- tablish design or operating bases. The regulatory tained from the model studies should be documented.
  • position contained in this guide applies only to Where applicable, model adjustment and verification

'physical models used to predict the action or interac- procedures should be described, and information tion of surface waters with features located outside of should be furnished on the validity of the model over containment. a range of likely flow conditions, heat regimes, at- mospheric conditions, and other physical parameters.

Generally, regulatory positions I and 3 describe in- Where applicable, it should be demonstrated that the formation that should be furnished prior to actual model will simulate known flow conditions; this ver- model testing., and regulatory positions 4 through 6 ification should be provided when historical data are describe information needed after testing is com- available.

pleted. Additionally, partial test results should be

  • provided for staff review and acceptance during the 4. Where full-scale structures or systems having
  • course of testing to ensure reconsideration of characteristics similar to those being modeled exist
  • parameters whose importance becomes apparent on and information relative to the observed or measured the basis of partial data collection. After completing performance of the existingstructures or systems is the entire study, all the information should be con- available, the physical model results should be com- solidated either (1) as a separate report with ap- pared with the available information generated by the
  • propriate reference added in the PSAR or (2) for in- existing structures. Testing performed on existing sertion into the PSAR. full-scale structures or systems and the results of these tests should be describe

d. The applicability of

1. Prior to construction of the model, the appli- such tests to the problem in question should be

  • cant should submit information outlining (a) the documented, and any conclusions derived from the
  • problem to be resolved, (b) reasons for selecting the tests should be discussed. If the results of other model

.

hydraulic model chosen to resolve the problem, (c)

expected results to be obtained, (d) a detailed descrip- tion of the model, including a description of materials, methods used to measure parameters, scale tests are used by the applicant, justification for the use of these results and verification of the ability of these other models to reproduce or predict prototype performance should also be provided.

0

relations, and other physical characteristics of the model, (e) methods that will be used to analyze the Detailed documentation of data obtained from

  • data obtained from the model studies, and (0 a existing full-scale structures and systems should be schedule of expected tests, proposed completion provided, including (a) instrumentation used, (b)

dates, and estimated dates for submittal of informa- description of the data collection network, (c) fre-

  • tion for NRC staff review. quency of collection,. (d) methods of collection, and (e) physical parameters existing at the time of collec-

2. Staff views and recommendations should be tion, such as heat regimes, flow conditions, and at- solicited prior to model construction and following mospheric conditions.

or coincident with the submittal of the information

  • listed in regulatory position 1, and arrangements 5. Any changes to the original design of the should also be made for appropriate members of the prototypes as a result of the model test should be dis- staff to be present periodically during model opera- cussed. The designs that were modeled and the basis tion to observe the actual performance of the model. for modifying the design should be documented.

Undesirable flow characteristics or failure modes for

3. Documentation should be furnished on how the the design tested, as well as any oiihcr problems, various conditions of geometric, kinematic, dynamic, should be discussed.

and thermodynamic.similitude that take into account

.the physical properties and flow state of the fluid (i.e,. -6. Figures. drawings, photographs, and text sub- Froude, Reynolds, Euler, Cauchy, Weber, and other mitted as documentation for regulatory positions 3, related numbers) have been considered. Because-cer- 4, and 5 should be provided in sufficient detail to al- tain forces may act differently in a model than in a low the staff to evaluate independently the ap- prototype, documentation should be provided to plicability of the model to the design problem in justify the neglect of any forces by showing that these question. (A typical model investigation report as forces (a) are of negligible magnitude, (b) compensate published by the U.S. Army Waterways Experiment for other neglected forces in such a manner that the Station has been found acceptable in the past.) Bases

1.125-2

for the interpretation of model results and for any Except in those cases in which the applicant conclusions reached should be provided. In many in- proposes an acceptable alternative method for com- stances, it may be advisable to provide partial test plying with specified portions of the Commission's results for review. The models should not be dis- regulations, the method described herein will be used mantled until the staff has reviewed the submittals. in the evaluation of submittals for construction per- mit applications docketed after November 1, 1977. If

D. IMPLEMENTATION

an applicant wishes to use this regulatory guide in developing submittals for construction permit ap- The purpose of this section is to provide informa- plications docketed on or before November 1, 1977, tion to license applicants regarding the NRC staff's the pertinent portions of the application will be plans for implementing this regulatory guide. evaluated on the basis of this guide.

1.125-3


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