ASTM D7491-2008(2015) 7814 Standard Guide for Management of Non-Conforming Coatings in Coating Service Level I Areas of Nuclear Power Plants《核电厂一级涂层服务区不合格涂料管理的标准指南》.pdf
《ASTM D7491-2008(2015) 7814 Standard Guide for Management of Non-Conforming Coatings in Coating Service Level I Areas of Nuclear Power Plants《核电厂一级涂层服务区不合格涂料管理的标准指南》.pdf》由会员分享,可在线阅读,更多相关《ASTM D7491-2008(2015) 7814 Standard Guide for Management of Non-Conforming Coatings in Coating Service Level I Areas of Nuclear Power Plants《核电厂一级涂层服务区不合格涂料管理的标准指南》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D7491 08 (Reapproved 2015)Standard Guide forManagement of Non-Conforming Coatings in CoatingService Level I Areas of Nuclear Power Plants1This standard is issued under the fixed designation D7491; the number immediately following the designation indicates the year oforiginal adoption or
2、, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This guide provides the user with guidance on develop-ing a program for managin
3、g non-conforming coatings inCoating Service Level I areas of a nuclear power plant.1.2 Non-conforming coatings include degraded previouslyDBA-qualified or acceptable coatings, unqualified coatings,unknown coatings, and unacceptable coatings.1.3 This standard does not purport to address all of thesaf
4、ety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D4538 Terminology Relating to P
5、rotective Coating andLining Work for Power Generation Facilities2.2 Other Documents:Regulatory Guide 1.54 Service Level I, II, and III protectiveCoatings Applied to Nuclear Power Plants3EPRI Report 1003102 Guideline on Nuclear Safety-RelatedCoatings, Revision 1 (formerly TR-109937)43. Terminology3.1
6、 DefinitionsDefinitions for use with this guide areshown in Terminology D4538 or other applicable standards.3.2 Definitions of Terms Specific to This Standard:3.2.1 non-conforming coatings, na coating or coatingsystem in a Coating Service Level I application that lacks orhas insufficient documentati
7、on to support or verify DBAqualification.3.2.1.1 DiscussionThis would include coatings referred toas unqualified, unacceptable, and degraded qualified coatings.3.2.2 unacceptable coating system, nAsafety related coat-ing system for which no suitability for application reviewwhich meets the plant lic
8、ensing requirements has been com-pleted.3.2.2.1 DiscussionTherefore, no reasonable assurance ex-ists that, when properly applied and maintained, the coating orlining will not detach under normal or accident conditions.This is applicable to “pre-ANSI” plants.4. Summary of Practice4.1 The process and
9、use of this guide is summarized inFig. 1.5. Significance and Use5.1 There are several methods for managing non-conforming coatings in an operating nuclear power plant. Thisguide outlines methods that have been determined to beacceptable to the nuclear industry.5.2 Managing the amount of non-conformi
10、ng coatings iskey to ensuring the amount assumed, in the licensing bases isnot exceeded.5.3 EPRI Report 1003102 Revision 1 (formerly TR-109937) provides additional information on the selection,application, inspection and maintenance of nuclear plantsafety-related protective coatings. This reference
11、offers adetailed discussion of important considerations related toprotective coatings and can be used to supplement this guide asdeemed necessary.6. Establishing the Design Limit of Non-ConformingCoatings6.1 Determine what coatings do not meet the licensing basisfor the plant. For plants that have c
12、ommitments to meetRegulatory Guide 1.54 (applicable revision) and/or related1This guide is under the jurisdiction of ASTM Committee D33 on ProtectiveCoating and Lining Work for Power Generation Facilities and is the directresponsibility of Subcommittee D33.10 on Protective Coatings Maintenance Workf
13、or Power Generation Facilities.Current edition approved Dec. 1, 2015. Published January 2016. Originallyapproved in 2008. Last previous edition approved in 2008 as D7491 08. DOI:10.1520/D7491-08R15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service
14、at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from U. S. Nuclear Regulatory Commission, Distribution ServicesSection, Washington, DC 205550001, http:/www.nrc.gov.4Available from EPRI Customer Fulfil
15、lment, 1355 Willow Way, Suite 278,Concord, CA 94520.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1FIG. 1 Managing Non-Conforming CoatingsD7491 08 (2015)2ANSI/ASTM standards typically require DBA testing of coat-ings and extensive do
16、cumentation associated with the applica-tion of the qualified coatings. This may be a more significantrequirement to satisfy than for an older plant which has notmade commitments to these requirements.6.2 The key to ensuring plant safety is to manage theamount of non-conforming coatings so that it d
17、oes not exceedthe amount assumed in calculations that support plantoperation, such as sump suction strainer head loss.6.3 Managing non-conforming coatings, must consider thecapacity of the Emergency Core Cooling System (ECCS)suction strainer to accommodate debris expected to reach theECCS suction st
18、rainer (including coating debris) withoutreducing the overall ECCS pump net positive suction head(NPSH) margin below an acceptable value. Those plants withsignificant operational NPSH margin for accommodating ad-ditional debris may require less precision when determining theamount of non-conforming
19、coatings; simplified bounding tech-niques may be sufficient.6.4 The non-conforming condition may also affect otherplant design and licensing limits, such as coating thicknessaffects on the accident heat transfer and peak temperaturecalculations, and Fire Hazards Analysis.7. Determining the Amount of
20、 Non-Conforming Coatings7.1 Essentially every plant has some amount of non-conforming coatings inside of primary containment and thismay be an acceptable condition. There are two considerationswhen identifying non-conforming coatings.7.1.1 Does the coating meet the licensing basis commit-ments?7.1.2
21、 Is there reasonable assurance the coating will notdetach during normal operation or a Design Basis Accident(DBA)?7.2 The amount of coating that was applied inconsistentwith licensing commitments and design requirements needs tobe identified.7.3 It may also be appropriate to review procurementdocume
22、nts (including records of work performed ) for equip-ment installed in containment to determine if coating applica-tions performed off site conforms to licensing bases and designrequirements.7.4 If records cannot be found that identify the types andquantities of coatings (for example, weight or volu
23、me) in-stalled in containment, then some area, thickness, and densityestimations need to be performed.7.5 The results of the investigation should be tabulatedaccording to the various containment surfaces, indicating thetype, quantity, location, and qualification classification of thecoating applied.
24、 Photographic documentation is also helpfulfor reference to the findings.7.6 The tabulation should also consider identification of thecomplete coating system as applied.7.7 Periodic reassessment or establishing a new baselineshould be considered.8. Guidance on Managing Non-Conforming Coatings8.1 Onc
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
5000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTMD7491200820157814STANDARDGUIDEFORMANAGEMENTOFNONCONFORMINGCOATINGSINCOATINGSERVICELEVELIAREASOFNUCLEARPOWERPLANTS

链接地址:http://www.mydoc123.com/p-525648.html