1、Designation: D3911 08D3911 16Standard Test Method forEvaluating Coatings Used in Light-Water Nuclear PowerPlants at Simulated Design Basis Accident (DBA)Conditions1This standard is issued under the fixed designation D3911; the number immediately following the designation indicates the year oforigina
2、l adoption 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 co
3、ntainment 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 t
4、he containment tonear-ambient pressure and temperature conditions.1. Scope1.1 This test method establishes procedures for evaluating protective coating systems test specimens under simulated DBAconditions. Included are a description of conditions and apparatus for temperature-pressure testing, and r
5、equirements for preparing,irradiating, testing, examining, evaluating, and documenting the samples.1.2 Consideration should be given to testing using worst case conditions (for example, surface preparation, temperature andpressure profile, irradiation, spray chemistry, chemical resistance, etc.) in
6、an effort to reduce the number of tests required bychanging plant accident calculations, changes in coating selection, etc.1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematicalconversions to SI units that are provided for informati
7、on only and are not considered standard.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatoryli
8、mitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D714 Test Method for Evaluating Degree of Blistering of PaintsD4082 Test Method for Effects of Gamma Radiation on Coatings for Use in Nuclear Power PlantsD4538 Terminology Relating to Protective Coating and Lining Work for Power Gener
9、ation FacilitiesD5139 Specification for Sample Preparation for Qualification Testing of Coatings to be Used in Nuclear Power Plants3. Terminology3.1 DefinitionsDefinitions for use with this standard are shown in Terminology D4538 or other applicable standards.4. Significance and Use4.1 This test met
10、hod is designed to provide a uniform test to determine the suitability of Coating Service Level 1 coatings usedinside primary containment of light-water nuclear facilities under simulated DBA conditions. This test method is intended only to1 This test method is under the jurisdiction ofASTM Committe
11、e D33 on Protective Coating and Lining Work for Power Generation Facilities and is the direct responsibilityof Subcommittee D33.02 on Service and Material Parameters.Current edition approved Nov. 1, 2008Aug. 1, 2016. Published January 2009October 2016. Originally approved in 1980. Last previous edit
12、ion approved in 20032008 asD3911 03.D3911 08. DOI: 10.1520/D3911-08.10.1520/D3911-16.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary p
13、age on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that
14、 users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1demonstrate that under D
15、BAconditions, the coatings will remain intact and not form debris which could unacceptably compromisethe operability of engineered safety systems. Deviations in actual surface preparation and in application and curing of the coatingmaterials from qualification test parameters require an engineering
16、evaluation to determine if additional testing is required.4.2 Since different plants have different tolerance levels for coating conditions, the definition of appropriate acceptance criteriais to be developed by the license holder based on individual plant engineered safety systems operability consi
17、derations.4.3 Use of this standard is predicated on the testing facility having a quality assurance program acceptable to the licensee.5. Apparatus5.1 Environmental Test Chamber, System, Test Sample Hangers, and Test Sample Identification Tags, constructed of materialsthat are corrosion-resistant to
18、 the test solutions.5.2 The equipment test system shall be capable of reproducing and continuously recording the temperature and pressure profilesof the DBA conditions.5.3 Asufficient number of thermocouples shall be located in the test chamber to assure conformity to the test curve, and so thatboth
19、 the temperature of the vapor phase and, if required, of the liquid phase (if present) can be recorded.5.4 The thermocouples and test specimenssamples shall be positioned to avoid direct steam and spray impingement.5.5 The equipment test system shall be constructed so as to allow test specimens to b
20、e exposed capable of allowing test samplesto be exposed, as specified by the licensee, to total immersion, to liquid-vapor interface, and to spray as appropriate.spray.5.6 WARNING: It It should be noted that high temperature steam is involved and that appropriate safety measures shouldbe taken to pr
21、otect personnel operating such equipment.6. Preparation of Test SpecimensSamples6.1 Determine the appearance of the test panels prior to testing by photo documentation or equivalent methods in order toprovide a basis for post-test comparison. The testing requirements should indicate if this assessme
22、nt will be done prior to shippingto the test facility.6.1 Unless otherwise specified, a minimum of four samples five samples, one of which will be a reference (control) sample thatwill remain unexposed, shall be required to establish conformance of a given coating system on a given substrate, with t
23、wo of theremaining four samples being irradiated prior to testing in accordance with Test Method D4082. Typical laboratory testspecimenssamples are 2 by 4 by 18 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) forconcrete blocks.6.1.1 Steel PanelsPrepare in a
24、ccordance with Specification D5139 or as specified by the licensee. Ensure that all surfaces,including edges, are coated.6.1.2 Concrete BlocksPrepare in accordance with Specification D5139 or as specified by the licensee.6.2 Document the sample preparation for metallic and non-metallic substrates in
25、 accordance with the requirements ofSpecification D5139.6.3 Document the appearance of the test samples (both original and maintenance coating systems, if applicable) prior to testingby photo documentation or equivalent methods in order to provide a basis for post-test comparison. The testing requir
26、ementsshould indicate if this assessment will be done prior to shipping to the test facility.7. Procedure7.1 Test Parameters:7.1.1 Test coatings using the applicable time-temperature-pressure curves identified by the plant design basis. Examples oftime-temperature-pressure test curves that have been
27、 used to simulate primary containment atmospheres during a DBA are shownin Fig. 1 and Fig. 2. These curves may not bound the time-temperature-pressure curves of newer generation nuclear power plants.7.1.2 The parameters of the curves may be simulated during testing as continuous functions or as an e
28、nveloping stepwisefunction.7.1.3 Steam shall be generated from deionized or distilled water. Steam is used initially to achieve the desired thermal shockand to raise the test chamber and its environment to the prescribed test conditions. The temperature of the test chamber ismaintained by means of i
29、nternal or external resistance, or both, heating elements, or other suitable means. The inlet steam shallnot impinge directly on the test specimen.sample.7.2 Spray Solution:7.2.1 Unless otherwise specified in the plant design basis, the spray chemistry shall be either Solution A, B, or C as describe
30、din Table 1 when testing under simulated DBA conditions.7.2.2 Record the chemical composition of the spray solution before each test.7.2.3 The spray solution shall be withdrawn from the bottom of the chamber and recirculated through the spray nozzles.D3911 1627.2.4 Fresh spray solution may be added
31、as needed to maintain specified autoclave conditions. If fresh spray solution is added,an equal amount of spray solution shall be removed to maintain the same volume of spray solution in the autoclave whencondensate level is to be controlled during the test.7.2.5 Direct impingement of the spray solu
32、tion onto the test sample shall be avoided unless otherwise directed by the licensee.FIG. 1 Example Design Basis Accident (DBA) Testing Parameters (Temperature-Time-Pressure)BWR DrywellFIG. 2 Example Design Basis (DBA) Testing Parameters (Temperature-Time-Pressure)PWR ContainmentTABLE 1 Typical Spra
33、y SolutionsComposition Chemical Compound Concentration (in Deionized orDistilled Water)A Sodium borate 2000 to 4000 ppm boronSodium hydroxide adjust solution to pH 9.0 to 10.0Sodium hydroxide adjust solution pH to between 9.0and 10.0B Boric acid 2000 to 4000 ppm boronHydrazine 50 ppm unreacted exces
34、sSodium phosphate, dibasic adjust solution pH to 6.8 to 10.0Sodium phosphate, dibasic adjust solution pH to between 6.8and 10.0C Deionized or distilled waterD3911 1638. Examination and Report8.1 Examination:8.1.1 Examine and evaluate test specimenssamples within 4 h and again after 14 days following
35、 removal from the test chamberfor the following coating conditions:8.1.1.1 Delamination.8.1.1.2 Cracking.8.1.1.3 Blistering in accordance with Test Method D714.8.1.2 Unless otherwise instructed, disregard the condition of the edges and plane areas within 14 in. (6.4 mm) from the edgesof the steel or
36、 concrete test surfaces, and the top and bottom ends of the concrete blocks.8.1.3 When directed by the licensee, coated test samples shall be weighed prior to testing and no sooner than 7 days after testingto detect any coating loss.8.2 ReportReport the following information:8.2.1 The results of the
37、 examination and evaluation of each test specimen.sample. Report for all sides of concrete blocks andfront and back of steel panels.8.2.2 The extent of each condition from 8.1.8.2.3 Any observations of unusual appearances.9. Acceptance Criteria9.1 The plant design basis shall be reviewed against the
38、 report generated in 8.2 for coating acceptability. The licensee isresponsible for establishing acceptance criteria for Coating Service Level I coatings.10. Documentation10.1 Testing ProceduresDocument each of the following:10.1.1 Adescription of the test apparatus, temperature and pressure profiles
39、, spray solution composition including pH, duration,frequency, and rate of spray solutions, and any other pertinent test conditions.10.2 Test Agency:10.2.1 The testing agency shall be responsible for the documenting, reporting, and certifying of all tests.10.2.2 The testing agency shall be responsib
40、le for meeting applicable quality assurance requirements.10.2.3 The testing agency shall be responsible for providing color photographic documentation of the test surfaces as required.10.2.3.1 Photographs shall reflect the actual size as close as possible of the test specimens.samples.10.2.3.2 As a
41、minimum, photographs of each test specimensample should be taken before test initiation and within 4 hours andat 2 weeks after DBA testing.in conjunction with the 4-hour and 2-week after DBA testing inspections.11. Repairability11.1 Test repair coatings in accordance with the requirements of this st
42、andard.11.2 The test shall include evaluation of the repair coating applied in accordance with the repair procedure over the intendedsurface preparation or the original qualified coating system, or both.12. Precision12.1 Calibrated test equipment must be demonstrated to have the capability to reprod
43、uce the design temperature (65F (3C)design pressure within (63 psig) parameters within 65 seconds of temperature/pressure change and 62 min at operatingtemperature.change.13. Keywords13.1 coatings; Coating Service Level I; containment; DBA; design basis accident; LOCA-loss of coolant accident; nucle
44、arD3911 164APPENDIXES(Nonmandatory Information)X1. COATINGS DEBRIS AND CONDENSATE ANALYSISX1.1 Users of this test method should consider collection and analysis of any residues remaining in the autoclave chamber andassociated piping. These residues (soluble and non-soluble) are representative of coa
45、tings debris which might be produced inprimary containment during an actual DBA (LOCA) event. Coatings debris, in combination with fibrous debris, has been shownin certain instances to result in degradation (clogging) of ECCS suction strainers and potentially to adversely affect downstreamequipment
46、by abrasion and/or wear (commonly referred to as “downstream effects”).Particulate coatings debris has been collected in DBA testing using this test method by installation of 10 m filtration in theautoclave recirculation spray piping. Chemical (soluble) debris produced by dissolution of coating comp
47、onents during DBAtestinghas been detected by chemical analysis of the condensate remaining in the autoclave after test completion.X2. WITNESS COUPONS IN PRIMARY CONTAINMENTX2.1 Users of this test method involved in design and construction of new nuclear power plants should consider installation ofco
48、ated “witness panels” at various locations in primary containment. This practice has been used by Electricit de France (EdF)in many of its nuclear power plants.The coated “witness panels” would be representative of the aged condition of the similar coatings on permanent systems,structures and compon
49、ents within the primary containment of a given nuclear power plant. The “witness panels” could be usedfor coating condition analysis and aging studies during the commercial life of the nuclear 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 such rights, are entirely their own responsibility.This standard is subject t
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