ML20197D146
| ML20197D146 | |
| Person / Time | |
|---|---|
| Issue date: | 11/07/1978 |
| From: | Minogue R NRC OFFICE OF STANDARDS DEVELOPMENT |
| To: | |
| References | |
| RTR-REGGD-01.125, RTR-REGGD-1.125 NUDOCS 7811210400 | |
| Download: ML20197D146 (2) | |
Text
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120 PUBLIC DOCUMENT ROOM 7590-01 NUCLEAR REGULATORY COMMISSION REGULATORY GUIDE Notice of Issuance and Availability The Nuclear Regulatory commission has issued a guide in its Regulatory Guide Series.
Th'.; series has been developed to describe and make available to the pLblic methods acceptable to the NRC staff of implementing specific parts of the Commission's regulations and, in some cases, to delineate techniques used by the staff in evaluating specific problems or postulated accidents and to provide guidance to applicants concerning certain of the information needed by the staff in its review of applications for permits and licenses.
Regulatory Guide 1.125, Revision 1, " Physical Models for Design and Operation of Hydraulic Structures and Systems for Nuclear Power Plants," describes the detail and documentation of data and studies that an applicant should include in the Preliminary Safety Analysis Report to support the use of physical hydraulic model testing for pre-dicting performance of safety-related hydraulic structures and systems for nuclear power plants.
It also describes the coordination desired between an applicant and the NRC staff in the planning stage for a physical model. This guide was revised as a result of public comment and additional staff review.
Coments and suggestions in connection with (1) items for inclu-sion in guides currently being developed or (2) improvements in all
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. published guides are encouraged at any time.
Coments should be sent to the Secretary of the Commission, U.S. Nuclear Regulatory Commission, Washington,.n.C. 20555, Attention:
Docketing and Service Branch, Regulatory guides a're available for inspection at the Commission's Public Docun,ent Room,1717 H StNet NW., Washington, D.C.
Requests for single copies of the latest revision of issued guides (which may be reproduced) or for placement on an automatic distribution list for single ccpies of future guides in specific divisions should be made in writing to the U.S. Nuclear Regulatory Commission, Washington, D.C.
20555, Attentior.:
Director, Division of Technical Information and Document Control. Telephone requests cannot be accommodated. Regulatory guides are not copyrighted, and Commission approval is not required to reproduce them.
(5 U.S.C. 552(a))
Dated at Rockville, Maryland this 7th day of November 1978.
For the Nuclear Regulatory Commission.
b mf' Robert B. Minogue, Director Office of Standards Development
Q ' gag'o Rsvlalon 1
- U.S. NUCLEAR REGULATORY COMMISSION October 1978 '
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OFFICc OF STANDARDS DEVELOPMENT REGULATORY GUIDE 1.125 PHYSICAL MODELS FOR DESIGN AND OPERATION OF HYDRAULIC STRUCTURES AND SYSTEMS FOR NUCLEAR POWER PLANTS A. INTRODUCTION design or configuration and hydraulic parameters Paragraph (a) (3) (ii) of $50.34, " Contents of cannot be adequately evaluated by state.of-the-art Applications; Technical Information," of 10 CFR analytical methods. Hydraulic models may also be Part 50, " Domestic Licensing of Production and used to establish conservative and reasonable design Utilization Facilities," requires that the Preliminary or operating bases for sites, structures, or systems Safety Analysis Report (PSAR) inchide information involving thermal and erosional problems.
on the design bases of the facility and the relation of Examples of types of physical modeling studies the design bases to the principal design criteria.
include, but are not confined to, the following:
Paragraph (a) (4) of 550.34 requires, in part, a
preliminary analysis of the adequacy of structures,
- 1. Intake structures.
systems, and components provided for the prevention
- 2. Discharge structures.
of accidents and the mitigation of the consequences
- 3. Energy dissipation structures.
of accider.ts.
- 4. Spillway and tailwater ratings for dams (waterlevel discharge relations).
This guide describes the des. ired coordinat. ion of an
- 5. Release of water resulting from dam failures.
goplicant with the NRC staff and the detail and
- 6. Wave runup, including tsunami effects.
documentation of data and studies that an apph, cant
- 7. Stability of structure when exposed to waves should include in the PSAR to support the use of and protection therefrom.
physical hydraube model testing for predicting per-
- l formance of safety-related hydraub,e structures and
- 8. Erosion and deposition in streams and other water bodies and protection therefrom.
systems for nuclear power plants. The regulatory
- 9. Flow patterns and dispersion of heated or position of this guide is applicable only to physical models used to predict the action or interaction of contaminated effluents in receiving water bodies.
surface waters with features located outside of con' tainment. The recom andations of this guide are not
- 10. Heat dissipation in receiving water bodies.
applicable to internal plant systems or structures, i1. Response of moored floating bodies to incident wave systems.
The Advisory Committee on Reactor Safeguards
- 12. Response of harbors to waves.
has been consulted concerning this guide and has concurred in the regulatory position.
It has been the experience of the NRC staff that some applicants have not furnished sufficiently de-tailed information on physical hydraulic model B. DISCUSSION studies for the staff to perform an adequate review. In Physical hydraulic models are often used to predict some instances, staff involvement in the early plan-prototype performance. They are particularly useful ning of a model study would have resulted in savings where hydraulic structures and systems are of unusual of both NRC and applicant funds and time in the review and acceptance of the results.
- Lines indicate substantive changes fmm previous issue.
Accordingly, the regulatory position describes the usNRC REGULATORY GUIDES j
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The guides are issued in the following ten broad divisions:
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. docurnentation that should be furnished and the type -
of the stati to be present periodically during model -
of coordination between the staff and the applicant operation to observe the actual performance of the that should minimize the' time necessary for accept-model.
ance of the results of model studies.
- 3. Furm. h documentation on how the various con-s The information described in the regulatory posi-ditions of geometric, kinematic, dynamic, and ther-tion should be incorporated in the PSAR. However, modynamic similitude that take into account the the staff recognizes that it will not always be possible physical properties and flow state of the fluid (i.e.,
to incorporate such information in the initial applica-Froude, Reynolds, Euler, Cauchy, Weber, and other tion for a construction permit since studies of this related numbers) have been considered. Because type may not be undertaken until after the PSAR is.
certain forces may act differently in a model than in a submitted. Such inforretation may, therefore, be prototype, documentation should be provided to jus-added to the PSAR by amendment, either by refer-
.tify the neglect of any forces by showing that these ence to separate reports or by insertion into the forces (a) are of negligible magnitude, (b) compen-PS AR.
sate for other neglected forces in such a manner that the effects of both are negligible, or (c) are such that C. REGULATORY POSITION their neglect leads to conservative model results and establishment of conservative design or operating 4
Because not all hydraulic des.ign problems can be bases.
resolved by the mechanics of similitude and because there are limitations to hydraulic modeling, the NRC Documentation should be furnished on the methods staff should be furnished with certain documentation used to satisfy the equations of similitude in the for any structural, thermal, crosional, or other physi-model. Also document the effects of scale distortions cat hydraulic models used by the applicant to estab-on data obtained from the model studies. Where fish design or operating bases. The regulatory position applicable, model adjustment and verification proce-contained in this guide applies only to physical dures should be described, and information should be models used to predict the action or interaction of furnished on the validity of the model over a range of l surface waters with safety-related features located likely flow conditions, heat regimes, atmospheric outside of containment.
conditions, and other physical parameters. Where applicable, demonstrate that the model will simulate
, Generally, regulatory positions 1 and 3 describe mformation that should be furnished prior to actual known flow conditions, and provide this vecification when historical data are available.
model testing, and regulatory positions 4 through 6 describe information needed after tes ing is com-
- 4. Where full-scale structures or systems having pleted. Additionally, partial test results should be characteristics similar to those being modeled exist provided for staff review and acceptance during the and information relative to the observed or measured course of testing to ensure reconsideration of performance of the existing structures or systems is parameters whose importance emerges after partial available, the physical model results should be com-data collection. After completing the entire study, all pared with the available information generated by the the information should be consolidated either (1) as a existing structures. If testing is or has been per-separate report with appropriate reference added in formed on existing full-scale structures or systems, the PSAR or (2) for insertion into the PSAR.
such tests and their results should be described.
- 1. Prior to construction of the model, the applicant Document the applicability of such tests to the prob-should submit information outlimng (a) the problem lem in question, and discuss any conclusions derived to be resolved, (b) reasons for selecting the hydraube from the tests. If the results of other model tests are rnodel chosen to resolve the problem, (c) expected used by the applicant, justify the use of these results results to be obtained. (d) a detailed descr ption of and verify the ability of these other models to the model, including a description of matenals, reproduce or predict prototype performance.
methods used to measure parameters, scale relations, Detailed documentation of data obtained from and other physical characteristics of the model, (e) existing full. scale structures and systems should be methods that will be used to analyze the data provided, including (a) instrumentation used, (b) obtained from the model studies, and (f) a schedule description of the data collection network, (c) fre-of expected tests, proposed completion dates, and quency of collection, (d) methods of collection, and estimated dates for submittal of information for NRC (c) physical parameters existing at the time of staff review, collection, such as heat regimes, flow conditions, and
- 2. It is des.irable that staff views and recommenda-atmospheric conditions.
tions be solicited prior to model construction and
- 5. Any changes to the original design of the following or coincident with the submittal of the prototypes as a result of the model test should be information listed in regulatory position I and that discussed. Document the designs that were modeled arrangements also be made for appropriate members and the basis for modifying the design. Undesirable 1.125-2
flow characteristics or failure modes for the design reached. In many instances, it may be advisable to tested, as well as any other problems, should be provide partial test results for review. The models discussed.
should not be dismantled 2 until the 5.taff has re-6.' The report covering the completed model tests should include (a) instrumentation used, (b) descrip-D, IMPLEMENTATION tion of the data collection network, (c) frequency of collectica, and (d) method of collection. Figures, The purpose of this section is to provide informa-drawings, photographs, and text submitted as IIon to applicants regarding the NRC staff's plans for documentation for regulatory positions 3, 4. and 5 using this regulatory guide.
should be provided in sufficient detail to allow the This guide reflects current NRC practice. There-staff to evaluate independently the applicability of the fore, except in those cases in which the applicant model to the design problem in question. (A typical proposes an acceptable alternative method for com-model investigation report as published by the U.S.
i ply ng with specified portions of the Commission's Army Waterways Experiment Station has been found rej;ulations, the method described herein will be used acceptable in the past.) Provide bases for the in-terpretaiion of model results and for any conclusions n the evaluation of submittals for construction permit applications until this guide 6 sevised as a result of suggestions from the public or additional staff review.
8 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, 2 Preserving the model for a maximum of one year will be l Mississippi 39180.
acceptable in most cases.
l 1.125 3
UNITE D ST ATES NUCLE AR RE GULATORY COMMISSION '
W ASHINGTON, D. C 20555 POST AGE AND FE E5 P AID U.S. NUCLE A R RE GU LATOR Y OFFICI AL BUSINESS COMMISSION EEEEEEEEE
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