1、Designation: D 3911 08Standard Test Method forEvaluating Coatings Used in Light-Water Nuclear PowerPlants at Simulated Design Basis Accident (DBA)Conditions1This standard is issued under the fixed designation D 3911; the number immediately following the designation indicates the year oforiginal adop
2、tion or, 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.INTRODUCTIONDuring a DBA in nuclear power plants, conditions in the reactor containm
3、ent will be characterizedby elevated temperature and pressure, as well as the presence of a radiation environment. Watersprays, with or without chemical additives, may be used in the primary containment to suppress theconsequences of the event, to scavenge radioactive products, and to return the con
4、tainment tonear-ambient pressure and temperature conditions.1. Scope1.1 This test method establishes procedures for evaluatingprotective coating systems test specimens under simulatedDBA conditions. Included are a description of conditions andapparatus for temperature-pressure testing, and requireme
5、ntsfor preparing, irradiating, testing, examining, evaluating, anddocumenting the samples.1.2 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered stan
6、dard.1.3 This standard does not purport to address all of thesafety 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. Referen
7、ced Documents2.1 ASTM Standards:2D 714 Test Method for Evaluating Degree of Blistering ofPaintsD 4082 Test Method for Effects of Gamma Radiation onCoatings for Use in Light-Water Nuclear Power PlantsD 4538 Terminology Relating to Protective Coating andLining Work for Power Generation FacilitiesD 513
8、9 Specification for Sample Preparation for Qualifica-tion Testing of Coatings to be Used in Nuclear PowerPlants3. Terminology3.1 DefinitionsDefinitions for use with this standard areshown in Terminology D 4538 or other applicable standards.4. Significance and Use4.1 This test method is designed to p
9、rovide a uniform test todetermine the suitability of Coating Service Level 1 coatingsused inside primary containment of light-water nuclear facili-ties under simulated DBA conditions. This test method isintended only to demonstrate that under DBA conditions, thecoatings will remain intact and not fo
10、rm debris which couldunacceptably compromise the operability of engineered safetysystems. Deviations in actual surface preparation and inapplication and curing of the coating materials from qualifica-tion test parameters require an engineering evaluation todetermine if additional testing is required
11、.4.2 Since different plants have different tolerance levels forcoating conditions, the definition of appropriate acceptancecriteria is to be developed by the license holder based onindividual plant engineered safety systems operability consid-erations.4.3 Use of this standard is predicated on the te
12、sting facilityhaving a quality assurance program acceptable to the licensee.5. Apparatus5.1 Environmental Test Chamber, constructed of materialsthat are corrosion-resistant to the test solutions.1This test method is under the jurisdiction of ASTM Committee D33 onProtective Coating and Lining Work fo
13、r Power Generation Facilities and is the directresponsibility of Subcommittee D33.02 on Service and Material Parameters.Current edition approved Nov. 1, 2008. Published January 2009. Originallyapproved in 1980. Last previous edition approved in 2003 as D 3911 03.2For referenced ASTM standards, visit
14、 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-295
15、9, United States.5.2 The equipment shall be capable of reproducing andcontinuously recording the temperature and pressure profiles ofthe DBA conditions.5.3 Asufficient number of thermocouples shall be located inthe test chamber to assure conformity to the test curve, and sothat both the temperature
16、of the vapor phase and, if required, ofthe liquid phase (if present) can be recorded.5.4 The thermocouples and test specimens shall be posi-tioned to avoid direct steam impingement.5.5 The equipment shall be constructed so as to allow testspecimens to be exposed to total immersion, to liquid-vaporin
17、terface, and to spray as appropriate.5.6 WARNING: It should be noted that high temperaturesteam is involved and that appropriate safety measures shouldbe taken to protect personnel operating such equipment.6. Preparation of Test Specimens6.1 Determine the appearance of the test panels prior totestin
18、g by photo documentation or equivalent methods in orderto provide a basis for post-test comparison. The testingrequirements should indicate if this assessment will be doneprior to shipping to the test facility.6.2 Unless otherwise specified, a minimum of four samplesshall be required to establish co
19、nformance of a given coatingsystem on a given substrate, with two of the four samples beingirradiated prior to testing in accordance with Test MethodD 4082. Typical laboratory test specimens are 2 by 4 by18 in.(5.1 by 10.2 by 0.32 cm) for steel panels and 2 by 2 by 4 in.(5.1 by 5.1 by 10.2 cm) for c
20、oncrete blocks.6.2.1 Steel PanelsPrepare in accordance with Specifica-tion D 5139 or as specified by the licensee.6.2.2 Concrete BlocksPrepare in accordance with Speci-fication D 5139 or as specified by the licensee.7. Procedure7.1 Test Parameters:7.1.1 Test coatings using the applicable time-temper
21、ature-pressure curves identified by the plant design basis. Examplesof time-temperature-pressure test curves that have been used tosimulate primary containment atmospheres during a DBA areshown in Fig. 1 and Fig. 2. These curves may not bound thetime-temperature-pressure curves of newer generation n
22、uclearpower plants.7.1.2 The parameters of the curves may be simulated duringtesting as continuous functions or as an enveloping stepwisefunction.7.1.3 Steam shall be generated from deionized water. Steamis used initially to achieve the desired thermal shock and toraise the test chamber and its envi
23、ronment to the prescribed testconditions. The temperature of the test chamber is maintainedby means of internal or external resistance, or both, heatingelements, or other suitable means. The inlet steam shall notimpinge directly on the test specimen.7.2 Spray Solution:7.2.1 Unless otherwise specifie
24、d in the plant design basis,the spray chemistry shall be either Solution A, B, or C asdescribed in Table 1 when testing under simulated DBAconditions.7.2.2 Record the chemical composition of the spray solutionbefore each test.7.2.3 The spray solution shall be withdrawn from thebottom of the chamber
25、and recirculated through the spraynozzles.7.2.4 Fresh spray solution may be added as needed tomaintain specified autoclave conditions. If fresh spray solutionis added, an equal amount of spray solution shall be removedto maintain the same volume of spray solution in the autoclavewhen condensate leve
26、l is to be controlled during the test.8. Examination and Report8.1 Examination:FIG. 1 Example Design Basis Accident (DBA) Testing Parameters (Temperature-Time-Pressure)BWR DrywellD39110828.1.1 Examine and evaluate test specimens within4handagain after 14 days following removal from the test chamberf
27、or the following coating conditions:8.1.1.1 Delamination.8.1.1.2 Cracking.8.1.1.3 Blistering in accordance with Test Method D 714.8.1.2 Unless otherwise instructed, disregard the condition ofthe edges and plane areas within14 in. (6.4 mm) from the edgesof the steel or concrete test surfaces, and the
28、 top and bottomends of the concrete blocks.8.2 ReportReport the following information:8.2.1 The results of the examination and evaluation of eachtest specimen. Report for all sides of concrete blocks and frontand back of steel panels.8.2.2 The extent of each condition from 8.1.8.2.3 Any observations
29、 of unusual appearances.9. Acceptance Criteria9.1 The plant design basis shall be reviewed against thereport generated in 8.2 for coating acceptability. The licensee isresponsible for establishing acceptance criteria for CoatingService Level I coatings.10. Documentation10.1 Testing ProceduresDocumen
30、t each of the following:10.1.1 A description of the test apparatus, temperature andpressure profiles, spray solution composition including pH,duration, frequency, and rate of spray solutions, and any otherpertinent test conditions.10.2 Test Agency:10.2.1 The testing agency shall be responsible for t
31、hedocumenting, reporting, and certifying of all tests.10.2.2 The testing agency shall be responsible for meetingapplicable quality assurance requirements.10.2.3 The testing agency shall be responsible for providingcolor photographic documentation of the test surfaces asrequired.10.2.3.1 Photographs
32、shall reflect the actual size as close aspossible of the test specimens.10.2.3.2 As a minimum, photographs of each test specimenshould be taken before test initiation and within 4 hours and at2 weeks after DBA testing.11. Repairability11.1 Test repair coatings in accordance with the require-ments of
33、 this standard.11.2 The test shall include evaluation of the repair coatingapplied in accordance with the repair procedure over theintended surface preparation or the original qualified coatingsystem, or both.12. Precision12.1 Calibrated test equipment must be demonstrated tohave the capability to r
34、eproduce the design temperature (65F(3C) design pressure within (63 psig) parameters within 65seconds of temperature/pressure change and 62 min at oper-ating temperature.13. Keywords13.1 coatings; Coating Service Level I; containment; DBA;design basis accident; LOCA-loss of coolant accident; nuclear
35、FIG. 2 Example Design Basis (DBA) Testing Parameters (Temperature-Time-Pressure)PWR ContainmentTABLE 1 Typical Spray SolutionsComposition Chemical Compound Concentration (in Deionized Water)A Sodium borate 2000 to 4000 ppm boronSodium hydroxide adjust solution to pH 9.0 to 10.0B Boric acid 2000 to 4
36、000 ppm boronHydrazine 50 ppm unreacted excessSodium phosphate, dibasic adjust solution pH to 6.8 to 10.0C Deionized waterD3911083APPENDIXES(Nonmandatory Information)X1. COATINGS DEBRIS AND CONDENSATE ANALYSISX1.1 Users of this test method should consider collectionand analysis of any residues remai
37、ning in the autoclavechamber and associated piping. These residues (soluble andnon-soluble) are representative of coatings debris which mightbe produced in primary containment during an actual DBA(LOCA) event. Coatings debris, in combination with fibrousdebris, has been shown in certain instances to
38、 result indegradation (clogging) of ECCS suction strainers and poten-tially to adversely affect downstream equipment by abrasionand/or wear (commonly referred to as “downstream effects”).Particulate coatings debris has been collected in DBAtestingusing this test method by installation of 10 m filtra
39、tion in theautoclave recirculation spray piping. Chemical (soluble) debrisproduced by dissolution of coating components during DBAtesting has been detected by chemical analysis of the conden-sate remaining the autoclave after test completion.X2. WITNESS COUPONS IN PRIMARY CONTAINMENTX2.1 Users of th
40、is test method involved in design andconstruction of new nuclear power plants should considerinstallation of coated “witness panels” at various locations inprimary containment. This practice has been used by Electric-it de France (EdF) in many of its nuclear power plants.The coated “witness panels”
41、would be representative of theaged condition of the similar coatings on permanent systems,structures and components within the primary containment ofa given nuclear power plant. The “witness panels” could beused for coating condition analysis and aging studies during thecommercial life of the nuclea
42、r power plant.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of su
43、ch rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for addi
44、tional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to th
45、e ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D3911084
