1、ASME BPVC.III.1.NB-2021Division 1 Subsection NBClass 1 ComponentsSECTION IIIRules for Construction ofNuclear Facility Components2021ASME Boiler andPressure Vessel CodeAn International CodeMarkings such as“ASME,”“ASME Standard,”or any other marking including“ASME,”ASME logos,or the ASME Single Cerfic
2、aon Mark shall not be used on any item that is not constructed in accordance with all of the applicable requirements of the Code or Standard.Use of of the ASME Single Cerficaon Mark requires formal ASME cerficaon;if no cerficaon program is available,such ASME markings may not be used.(For Cerficaon
3、and Accreditaon Programs,see hps:/www.asme.org/cerficaon-accreditaon.)Items produced by pares not formally possessing an ASME Cerficate may not be described,either explicitly or implicitly,as ASME cerfied or approved in any code forms or other document.IIIRULES FOR CONSTRUCTIONOF NUCLEAR FACILITYCOM
4、PONENTSDivision 1-Subsection NBClass 1 ComponentsASME Boiler and Pressure Vessel Committeeon Construction of Nuclear Facility ComponentsTwo Park Avenue New York,NY 10016 USAAN INTERNATIONAL CODE2021 ASME Boiler&Pressure Vessel CodeJuly 1,20212021 EditionDate of Issuance:July 1,2021This international
5、 code or standard was developed under procedures accredited as meeting the criteria for American National Standards and it is an American National Standard.The Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have h
6、ad an opportunity to participate.The proposed code or standard was made available for public review and comment that provides an opportunity for additional public input from industry,academia,regulatory agencies,and the public-at-large.ASME does not“approve,”“certify,”“rate,”or“endorse”any item,cons
7、truction,proprietary device,or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable
8、 letters patent,nor assume any such liability.Users of a code or standard are expressly advised that determination of the validity of any such patent rights,and the risk of infringement of such rights,is entirely their own responsibility.Participation by federal agency representative(s)or person(s)a
9、ffiliated with industry is not to be interpreted as government or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the estab-lished ASME procedures and policies,which precludes the issuance of interpre
10、tations by individuals.The endnotes and preamble in this document(if any)are part of this American National Standard.ASME Collective Membership MarkASME Single Certification MarkASME and the above ASME symbols are registered trademarks of The American Society of Mechanical Engineers.No part of this
11、document may be reproduced in any form,in an electronicretrieval system or otherwise,without the prior written permission of thepublisher.Library of Congress Catalog Card Number:56-3934Printed in the United States of AmericaAdopted by the Council of The American Society of Mechanical Engineers,1914;
12、latest edition 2021.The American Society of Mechanical EngineersTwo Park Avenue,New York,NY 10016-5990Copyright 2021 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedTABLE OF CONTENTSList of Sections.viiForeword.ixStatement of Policy on the Use of the ASME Single Certification Mark a
13、nd Code Authorization in AdvertisingxiStatement of Policy on the Use of ASME Marking to Identify Manufactured Items.xiSubmittal of Technical Inquiries to the Boiler and Pressure Vessel Standards Committees.xiiPersonnel.xvOrganization of Section III.xxxviSummary of Changes.xlList of Changes in Record
14、 Number Order.xliiCross-Referencing and Stylistic Changes in the Boiler and Pressure Vessel Code.xliiiArticle NB-1000Introduction.1NB-1100Scope.1Article NB-2000Material.7NB-2100General Requirements for Material.7NB-2200Material Test Coupons and Specimens for Ferritic Steel Material.10NB-2300Fracture
15、 Toughness Requirements for Material.12NB-2400Welding Material.16NB-2500Examination and Repair of Pressure-Retaining Material.19NB-2600Material Organizations Quality System Programs.36NB-2700Dimensional Standards.36Article NB-3000Design.37NB-3100General Design.37NB-3200Design by Analysis.42NB-3300Ve
16、ssel Design.42NB-3400Pump Design.55NB-3500Valve Design.58NB-3600Piping Design.85Article NB-4000Fabrication and Installation.122NB-4100General Requirements.122NB-4200Forming,Fitting,and Aligning.123NB-4300Welding Qualifications.129NB-4400Rules Governing Making,Examining,and Repairing Welds.146NB-4500Brazing.153NB-4600Heat Treatment.155NB-4700Mechanical Joints.164Article NB-5000Examination.165NB-5100General Requirements for Examination.165iiiNB-5200Required Examination of Welds for Fabrication and