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
{{#Wiki_filter:t yR REG&, 9 0 U.S. NUCLEAR REGULATORY  
March 2009Revision 2 REGULATORY GUIDE
COMMISSION
  OFFICE OF NUCLEAR REGULATORY RESEARCH
March 1977 REGULATORY  
  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.
GUIDE 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 Ap-plications;
Technical Information," of 10 CFR Part 50, "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 pre-liminary analysis of the adequacy of structures, systems, and comnonents orovided for the prevention Examples of types of physical modeling studies in-clude, but are not confined to, the following:
I. Intake structures.
 
2. Discharge structures.
 
3. Energy dissipation structures.
 
4. Spillway and tailwater ratings for (dWrs (water-level discharge relations).
5. Release of water resulting from daiii'lures.
 
6. Wave runup, including ounaAi',effect'
7. Erosion from waves..and,.rtbilaotin therefrom.
 
8. Erosion and deppo8io'n in.i and other sysems and component prvie for. --.h- .. .....'-. ..... aenb desadtrt tooheno of accidents and the mwttgation of the consequences
...... and ..r: , *th eerom .of accidents.
 
mittonfts
9. Flow pattersand d(pettion of heated or con-taminated i&"recci'6ing water bodies.10. Heat'Al'sý
IK n-" receiving water bodies.This guide describes the desired coordination of an 10. Ha .r applicant with the NRC staff and the detail and ex eerience 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 the staff to perform an adequate review. In formance of hydraulic structures and systems 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 ppo a 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.ree US. Ni.1a -,ij Regutlatory Guidieae d.C twed to iesvrilte antd malte availablte to the, ptublic method, Ilaoty Ce,e .... ...awo. Vi,)Ii tee,', D.C. 7D~bV,. Ate .,I,ete L)-e 1e,nel, Ntn eed acceptable to the NRC staff ol imtlementie'j uiiecetec parts of the Cenlor,$inss~~, feee regulIatieons, to deliea~tetdt Ichetetteecl ,tivdl Ityth! stalfi cc tvalai nat stjwtecol c 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.


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.
and ConneteleieCe Withe them, is not triltuirtd.


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.
I Pectvt Iie-ectnr G midc,ele;ro Metthods atot solntlotv'  
dillefecnt from lholit, set ou!to i c M jetguide%
will hee Ancmil- Ffesi,...icnited Tot tetecci 1. ' awer~ltc able .1 they ttoe idt, a1 btasis It the. findeings rentuisite In, the ifsueinci!et Col co~ntnance.


REGULATORY GUIDE 1.125 (Draft was issued as DG-1198, dated May 2008)
V fl Ite ,ecc.1,,!mt lst F.1,tcttin, w% Qe8 ccttet I t.01thr of a Petmit or license by the Comcmission.
PHYSICAL MODELS FOR DESIGN AND OPERATION OF HYDRAULIC STRUCTURES AND SYSTEMS FOR  NUCLEAR POWER PLANTS 


==A. INTRODUCTION==
.1, Erivifortcnce-mtit ctl adSt tnq f) ete t lc,-"e 5r Mate, e.0,ine Ptan)t NolvotC "~Cormnians antd suggestions for itilltrnvetntent%
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.
in theso (euieetle ntt! etcncuraged at ;,I[gitime's, .ntrw goiei "Melt It evi"Icl .s in te, ltnuette.tt, to atcecrtto,ilitt ctttlflenrtt and~t tle4tectt Iwe lecele ccitfe te seee Mteej, t 4 erhe cee.e hi.e~eeute or let, tela,;'to rei edl fee. intotint Ieon ot et !I net'C,, Hoeweve~r, cornenerreot th!itts luetle., it eeee~t 'ten tee iutomtmtc n:e dt ieteeul etetetlee I ecte Cite'! ' tet leeee! n.e'ett lt itne , eefi teceivedl vvethin abeout ty. ioi ,,~hs titer its oletincc.


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.
vvil lee ttaelicntar,tl eestt~le to tleeeetoet quittet Itw netteo in eteteti tee tte U S. ~tel-ec.,,, tllqeetdnty Cetettcowaeeee evileeetetIltnatl It e *.tyttefUt Vdtlitnhmtttt, D.C. 205fbh. At t,-niut .e Deeq fe or. Dionuienr etf Uttinpritn Cultectol.


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.
C. REGULATORY
POSITION Because all hydraulic design problems cannot 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,I
or other physicalhydraulic models used by the applicant to es-tablish design or operating base


==B. DISCUSSION==
====s. The regulatory====
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.
* position contained in this guide applies only to'physical models used to predict the action or interac-tion of surface waters with features located outside of containment.


Examples of types of physical modeling studies of hydraulic structures and systems for nuclear power plants include, but are not confined to, the following: 
Generally, regulatory positions I and 3 describe in-formation 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 becomes apparent on the basis of partial data collection.


* intake structures and pump impeller flow characteristics ,
After completing the entire study, all the information should be con-solidated either (1) as a separate report with ap-* propriate reference added in the PSAR or (2) for in-sertion into the PSAR.1. Prior to construction of the model, the appli-* cant 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 descrip-tion 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 (0 a schedule of expected tests, proposed completion dates, and estimated dates for submittal of informa-* tion for NRC staff review.2. Staff views and recommendations should be solicited prior to model construction and following or coincident with the submittal of the information
* discharge structures, 
* listed in regulatory position 1, and arrangements should also be made for appropriate members of the staff to be present periodically during model opera-tion to observe the actual performance of the model.3. Documentation should be furnished on how 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) have been considered.
* 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.
Because-cer- tain forces may act differently in a model than in a prototype, documentation should be provided to justify the neglect of any forces by showing that these forces (a) are of negligible magnitude, (b) compensate 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 es-tablishme


==C. REGULATORY POSITION==
====n. t of conservative ====
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.
'design or operating bases.Documentation should be furnished on the methods used to satisfy the equations of similitude in the model. The effects of scale distortions on data ob-tained from the model studies should be documented.


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.
Where applicable, model adjustment and verification procedures should be described, and information should be furnished on the validity of the model over a range of likely flow conditions, heat regimes, at-mospheric conditions, and other physical parameters.


1. Regulatory Position 1 Before constructing the physical model, the applicant should submit a test plan that includes the following information:
Where applicable, it should be demonstrated that the model will simulate known flow conditions;
this ver-ification should be provided when historical data are available.


* the problem(s) to be resolved; 
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 existingstructures or systems is available, the physical model results should be com-pared with the available information generated by the existing structures.
* 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.
Testing performed on existing full-scale structures or systems and the results of these tests 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.
The applicability of such tests to the problem in question should be documented, and any conclusions derived from the tests should be discussed.


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.
If the results of other model 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.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 collec-tion, such as heat regimes, flow conditions, and at-mospheric 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 dis-cussed. The designs that were modeled and the basis for modifying the design should be documented.


* instrumentation used; 
Undesirable flow characteristics or failure modes for the design tested, as well as any oiihcr problems, should be discussed.
* 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.
-6. Figures. drawings, photographs, and text sub-mitted as documentation for regulatory positions
3, 4, and 5 should be provided in sufficient detail to al-low the staff to evaluate independently the ap-plicability of the model to the design problem in question. (A typical model investigation report as published by the U.S. Army Waterways Experiment Station has been found acceptable in the past.) Bases 0 1.125-2 for the interpretation of model results and for any conclusions reached should 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.
In many in-stances, it may be advisable to provide partial test results for review. The models should not be dis-mantled until the staff has reviewed 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 license applicants regarding the NRC staff's plans for implementing this regulatory guide.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 per-mit applications docketed after November 1, 1977. If an applicant wishes to use this regulatory guide in developing submittals for construction permit ap-plications docketed on or before November 1, 1977, the pertinent portions of the application will be evaluated on the basis of this guide.1.125-3}}
 
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.}}


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Revision as of 12:57, 17 September 2018

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


t yR 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

Paragraph (a) (3) (ii) of §50.34, "Contents of Ap-plications;

Technical Information," of 10 CFR Part 50, "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 pre-liminary analysis of the adequacy of structures, systems, and comnonents orovided for the prevention Examples of types of physical modeling studies in-clude, but are not confined to, the following:

I. Intake structures.

2. Discharge structures.

3. Energy dissipation structures.

4. Spillway and tailwater ratings for (dWrs (water-level discharge relations).

5. Release of water resulting from daiii'lures.

6. Wave runup, including ounaAi',effect'

7. Erosion from waves..and,.rtbilaotin therefrom.

8. Erosion and deppo8io'n in.i and other sysems and component prvie for. --.h- .. .....'-. ..... aenb desadtrt tooheno of accidents and the mwttgation of the consequences

...... and ..r: , *th eerom .of accidents.

mittonfts

9. Flow pattersand d(pettion of heated or con-taminated i&"recci'6ing water bodies.10. Heat'Al'sý

IK n-" receiving water bodies.This guide describes the desired coordination of an 10. Ha .r applicant with the NRC staff and the detail and ex eerience 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 the staff to perform an adequate review. In formance of hydraulic structures and systems 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 ppo a 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.ree US. Ni.1a -,ij Regutlatory Guidieae d.C twed to iesvrilte antd malte availablte to the, ptublic method, Ilaoty Ce,e .... ...awo. Vi,)Ii tee,', D.C. 7D~bV,. Ate .,I,ete L)-e 1e,nel, Ntn eed acceptable to the NRC staff ol imtlementie'j uiiecetec parts of the Cenlor,$inss~~, feee regulIatieons, to deliea~tetdt Ichetetteecl ,tivdl Ityth! stalfi cc tvalai nat stjwtecol c 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 Withe them, is not triltuirtd.

I Pectvt Iie-ectnr G midc,ele;ro Metthods atot solntlotv'

dillefecnt from lholit, set ou!to i c M jetguide%

will hee Ancmil- Ffesi,...icnited Tot tetecci 1. ' awer~ltc able .1 they ttoe idt, a1 btasis It the. findeings rentuisite In, the ifsueinci!et Col co~ntnance.

V fl Ite ,ecc.1,,!mt lst F.1,tcttin, w% Qe8 ccttet I t.01thr of a Petmit or license by the Comcmission.

.1, Erivifortcnce-mtit ctl adSt tnq f) ete t lc,-"e 5r Mate, e.0,ine Ptan)t NolvotC "~Cormnians antd suggestions for itilltrnvetntent%

in theso (euieetle ntt! etcncuraged at ;,I[gitime's, .ntrw goiei "Melt It evi"Icl .s in te, ltnuette.tt, to atcecrtto,ilitt ctttlflenrtt and~t tle4tectt Iwe lecele ccitfe te seee Mteej, t 4 erhe cee.e hi.e~eeute or let, tela,;'to rei edl fee. intotint Ieon ot et !I net'C,, Hoeweve~r, cornenerreot th!itts luetle., it eeee~t 'ten tee iutomtmtc n:e dt ieteeul etetetlee I ecte Cite'! ' tet leeee! n.e'ett lt itne , eefi teceivedl vvethin abeout ty. ioi ,,~hs titer its oletincc.

vvil lee ttaelicntar,tl eestt~le to tleeeetoet quittet Itw netteo in eteteti tee tte U S. ~tel-ec.,,, tllqeetdnty Cetettcowaeeee evileeetetIltnatl It e *.tyttefUt Vdtlitnhmtttt, D.C. 205fbh. At t,-niut .e Deeq fe or. Dionuienr etf Uttinpritn Cultectol.

C. REGULATORY

POSITION Because all hydraulic design problems cannot 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,I

or other physicalhydraulic models used by the applicant to es-tablish design or operating base

s. The regulatory

  • position contained in this guide applies only to'physical models used to predict the action or interac-tion of surface waters with features located outside of containment.

Generally, regulatory positions I and 3 describe in-formation 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 becomes apparent on the basis of partial data collection.

After completing the entire study, all the information should be con-solidated either (1) as a separate report with ap-* propriate reference added in the PSAR or (2) for in-sertion into the PSAR.1. Prior to construction of the model, the appli-* cant 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 descrip-tion 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 (0 a schedule of expected tests, proposed completion dates, and estimated dates for submittal of informa-* tion for NRC staff review.2. Staff views and recommendations should be solicited prior to model construction and following or coincident with the submittal of the information

  • listed in regulatory position 1, and arrangements should also be made for appropriate members of the staff to be present periodically during model opera-tion to observe the actual performance of the model.3. Documentation should be furnished on how 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) have been considered.

Because-cer- tain forces may act differently in a model than in a prototype, documentation should be provided to justify the neglect of any forces by showing that these forces (a) are of negligible magnitude, (b) compensate 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 es-tablishme

n. t of conservative

'design or operating bases.Documentation should be furnished on the methods used to satisfy the equations of similitude in the model. The effects of scale distortions on data ob-tained from the model studies should be documented.

Where applicable, model adjustment and verification procedures should be described, and information should be furnished on the validity of the model over a range of likely flow conditions, heat regimes, at-mospheric conditions, and other physical parameters.

Where applicable, it should be demonstrated that the model will simulate known flow conditions;

this ver-ification should be provided 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 existingstructures or systems is available, the physical model results should be com-pared with the available information generated by the existing structures.

Testing performed on existing full-scale structures or systems and the results of these tests should be described.

The applicability of such tests to the problem in question should be documented, and any conclusions derived from the tests should be discussed.

If the results of other model 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.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 collec-tion, such as heat regimes, flow conditions, and at-mospheric conditions.

5. Any changes to the original design of the prototypes as a result of the model test should be dis-cussed. The designs that were modeled and the basis for modifying the design should be documented.

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

-6. Figures. drawings, photographs, and text sub-mitted as documentation for regulatory positions

3, 4, and 5 should be provided in sufficient detail to al-low the staff to evaluate independently the ap-plicability of the model to the design problem in question. (A typical model investigation report as published by the U.S. Army Waterways Experiment Station has been found acceptable in the past.) Bases 0 1.125-2 for the interpretation of model results and for any conclusions reached should be provided.

In many in-stances, it may be advisable to provide partial test results for review. The models should not be dis-mantled until the staff has reviewed the submittals.

D. IMPLEMENTATION

The purpose of this section is to provide informa-tion to license applicants regarding the NRC staff's plans for implementing this regulatory guide.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 per-mit applications docketed after November 1, 1977. If an applicant wishes to use this regulatory guide in developing submittals for construction permit ap-plications docketed on or before November 1, 1977, the pertinent portions of the application will be evaluated on the basis of this guide.1.125-3


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