1、Designation:D749108Standard 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,in the case of revis
2、ion,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 managing non-conforming coatings in
3、Coating 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 thesafety concerns,if any,associated
4、 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 Protective Coating andLining Work f
5、or 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 DefinitionsDefinitions for use with th
6、is 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 documentation to support or verify DBAqualification
7、.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 licensing requirements has been com-pleted.3.2
8、.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 use of this guide is summarized inFig.1.5.Signifi
9、cance 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-conforming coatings iskey to ensuring the amount assumed,in
10、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 offers adetailed discrussion of inportant considerations
11、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 commitments to meetRegulatory Guide 1.54(applicable revisio
12、n)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 Workfor Power Generation Facilities.Current edition approved Nov.
13、1,2008.Published December 2008.DOI:10.1520/D7491-08.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available fro
14、m U.S.Nuclear Regulatory Commission,Distribution ServicesSection,Washington,DC 205550001,http:/www.nrc.gov.4Available from EPRI Customer Fulfillment,1355 Willow Way,Suite 278,Concord,CA 94520.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States
15、1 FIG.1 Managing Non-Conforming CoatingsD7491 082 ANSI/ASTM standards typically require DBA testing of coat-ings and extensive documentation 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 commi
16、tments to these requirements.6.2 The key to ensuring plant safety is to manage theamount of non-conforming coatings so that it does 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 strainer(including coating debris)withoutreducing the overall ECCS pump net p
