1、ANSI/IEEE Std 622-1987(R1994)(Revision of ANSI/IEEE Std 622-1979)An American National StandardIEEE Recommended Practice for the Design and Installation of Electric Heat Tracing Systems for Nuclear Power Generating StationsSponsorPower Generation Committeeof theIEEE Power Engineering SocietyApproved
2、December 11, 1986Reaffirmed September 22, 1994IEEE Standards BoardApproved November 23, 1987Reaffirmed March 17, 1995American National Standards Institute Copyright 1987 byThe Institute of Electrical and Electronics Engineers, Inc345 East 47th Street, New York, NY 10017, USANo part of this publicati
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11、the matter has previously received formal consideration.Comments on standards and requests for interpretations should be addressed to:Secretary, IEEE Standards Board345 East 47th StreetNew York, NY 10017USAiiiForeword(This Foreword is not a part of IEEE Std 622-1987, IEEE Recommended Practice for th
12、e Design and Installation of Electric HeatTracing Systems for Nuclear Power Generation Stations.)The realization that electric heat tracing systems play an important role in the normal operation of both nuclear andnon-nuclear processes in nuclear power generating stations has now come of age. This i
13、s apparent by the increasedamount of space being devoted to electric heat tracing in station technical specifications, system descriptions, andoperating criteria. Such electric heat tracing systems are applied on borated water systems and on water treatmentsystems such as caustic. Since boric acid a
14、nd caustics in water will crystalize or precipitate out of the solutiondepending on their concentrations at temperatures above ambient, and since such crystallization can make the pipingsystem inoperable for normal operation, electric heat tracing systems are required to keep the solutions and pipin
15、gsystems in a state to perform their intended functions. Electric heat tracing systems may also be applied on pipinglocated outdoors at nuclear generating stations for the purpose of preventing the piping systems from freezing. Itshould be noted that each and all of these piping systems can include
16、valves, pumps, strainers, tanks, andinstrumentation components that can be rendered inoperable due to solutions crystallizing or freezing. Therefore, adefinite need exists within the power industry for recommendations that provide a uniform method for the design andinstallation of electric heat trac
17、ing systems that meet the requirements for rendering reliable operation of the pipingsystem. Without such recommendations, station reliability may be jeopardized.This recommended practice is intended to meet the design and installation needs for pressurized water reactor (PWR)and boiling water react
18、or (BWR) nuclear generating stations. Breeder reactors and other types of applications areoutside the scope of this document. Also, the principles in this document are applicable to all types of generatingstations, for example, fossil, hydroelectric, etc. Presented herein are such recommendations an
19、d topics as identificationof piping systems to be heated, temperature requirements, heater design considerations, heat tracing systems design(including control and monitoring), power systems design, installation of electric heat tracing systems, testing of thesystems, and maintenance considerations.
20、Since electric heat tracing systems are interrelated with electric power and alarm systems, other IEEE standards shouldbe referred to when using this recommended practice. The recommendations presented herein are not intended tosupersede any current IEEE standards or practices, and sound engineering
21、 judgment should always be used whenapplying this or any other IEEE standard.Electric heat tracing systems play an important role in the normal operation of nuclear generating stations. Therefore,redundant circuit and heater considerations with respect to station reliability are covered in this reco
22、mmended practicealong with alarm considerations. This document recommends that electric heat tracing systems not be classified asClass lE systems and that critical process control systems be powered from reliable station power sources. If thesereliable power sources are the engineered safety feature
23、s (ESF) buses, then the electric heat tracing systems should bepowered through suitable isolation devices in accordance with ANSI/IEEE Std 308-1980, IEEE Standard Criteria forClass lE Power Systems for Nuclear Power Generating Stations, and ANSI/IEEE Std 384-1981, IEEE StandardCriteria for Independe
24、nce of Class lE Equipment and Circuits.The recommendation for not classifying electric heat tracing systems as Class lE is based on station operating criteria.In its investigation of electric heat tracing systems for critical process piping, the working group could find no evidencethat a properly de
25、signed system would come under a Class lE classification for proper performance. Electric heattracing systems that are applied on reactor injection piping systems do not perform any safety functions either duringor after a postulated loss-of-coolant accident (LOCA). Instead, electric heat tracing sy
26、stems render such pipingsystems operable during normal station operation and thus are not needed during or after a postulated LOCA. Forfurther discussion and technical explanations on normal and accident station operations with respect to nonClass lEelectric heat tracing systems, reference should be
27、 made to Appendix B of this document.An exception to this recommendation is the classification of electric heat tracing systems applied on post-accidentsampling systems. Such post-accident sampling systems were mandated by the Nuclear Regulatory Commission asivpart of the Three Mile Island Unit 2 re
28、trofit program initiated after this standard was first published in 1979.Explanation of these requirements may be found in Appendix C of this document.This recommended practice correlates industry practices; it is not intended to be an exhaustive compilation or a rigidprocedure manual. The document
29、was prepared by the working group on Electric Heat Tracing Systems, which wasformed by the Station Design Subcommittee of the Power Generation Committee.At the time this document was approved, the members of the working group were:C. L. Sandberg, Chair P. BaenH. CaldwellJ. J. DennehyE. JanusM. Plant
30、D. E. RobertsH. RomanowskiR. SchillingR. S. SchoellkopfThe working group would like to offer a special acknowledgement to past members who participated in the writing ofthe original ANSI/IEEE Std 622-1979 : G. P. Alexander, R. O. Bylin, W. C. Leslie, J. T. Mattox, R. A. McInturff, andR. M. Oehlschla
31、eger.At the time this document was approved, the members of the Station Design Subcommittee were:D. E. Roberts, Chair W. W. AvrilM. S. BaldwinJ. H. BellackR. O. BylinJ. B. CannonJ. W. ColwellR. E. CottaG. R. EngmanW. M. FennerR. E. FentonJ. J. HeagertyM. E. JackowskiR. I. LongwellO. S. MazzoniM. W.
32、MigliaroS. NikolakakosE. L. OwenJ. L. ParrisR. E. PennC. R. PopeE. P. RothongC. L. SandbergJ. M. SappingtonC. SclafaniR. G. ScottM. N. SprouseJ. E. Stoner, Jr.R. E. StrasserJ. B. SullivanH. E. Yocum, Jr.R. ZweiglerAt the time this document was approved, the members of the Power Generation Committee
33、were:R. W. Cantrell, Chair R. E. Cotta, Vice Chair M. W. Migliaro, Secretary W. W. AvrilM. S. BaldwinJ. H. BellackI. B. BerezowskyF. L. BrennanL. D. BoydstunG. G. BoyleS. R. BrockschinkP. G. BrownJ. B. CannonE. F. ChelottiH. E. Church, JrC. H. ClarridgeR. S. ColemanR. E. CottaM. L. CrenshawD. J. Dam
34、skerR. S. DarkeP. DavidsonD. Diamant*G. R. EngmanW. H. EsselmanT. F. FaulknerW. M. FennerA. H. FerberW. A. FrederickR. N. FriedmanD. I. GordenR. K. GuptaR. D. HandelJ. J. HeagertyM. E. JackowskiW. D. JacksonN. JaleeliJ. H. JonesE. F. KaprielianJ. KarigerF. KeayC. E. KneeburgvS. KuznetsovP. R. Landri
35、euS. LawP. LewisH. E. LokayG. L. LurjJ. T. MadillJ. D. MatherO. S. MazzoniT. M. McMahonG. R. MeloyD. H. MillerJ. L. MillsW. S. MorganP. A. NevinsS. NikolakakosJ. T. NikolasM. I. OlkenR. E. PennR. RamakumarR. J. ReimanD. E. RobertsR. G. ScottA. J. SpurginR. B. SquiresJ. V. StephensG. I. StillmanJ. E.
36、 Stoner, JrJ. B. SullivanV. C. SulzbergerS. TjepkemaR. H. WaltmanE. J. WarcholM. WarrenK. L. WestT. R. WhittemoreJ. P. WhooleyR. F. WillettC. J. WylieT. D. Younkins*Past chairmanThe following persons were on the balloting committee that approved this document for submission to the IEEEStandards Boar
37、d:W. W. AvrilM. S. BaldwinJ. H. BellackI. B. BerezowskyG. BermanR. W. CantrellH. E. ChurchR. S. ColemanR. E. CottaM. L. CrenshawD. J. DamskerP. M. DavidsonG. R. EngmannW. M. FennerA. H. FerberD. I. GordenR. D. HandelJ. H. JonesF. W. KeayP. R. LandrieuG. L. LuriJ. T. MadillO. S. MazzoniM. W. Migliaro
38、J. T. NikolasR. E. PennJ. D. PlaxcoR. J. ReimanD. E. RobertsR. G. ScottA. J. SpurginG. I. StillmanJ. E. Stoner, JrJ. B. SullivanT. R. WhittemoreJ. P. WooleyWhen the IEEE Standards Board approved this standard on December 11, 1986, it had the following membership:John E. May, Chair Irving Kolodny, Vi
39、ce Chair Sava I. Sherr, Secretary James H. BeallFletcher J. BuckleyPaul G. CummingsDonald C. FleckensteinJay ForsterDaniel L. GoldbergKenneth D. HendrixIrvin N. HowellJack KinnJoseph L. Koepfinger*Edward LohseLawrence V. McCallDonald T. Michael*Marco W. MigliaroStanley OwensJohn P. RiganatiFrank L.
40、RoseRobert E. RountreeMartha SloanOley WanaseljaJ. Richard WegerWilliam B. WilkensHelen M. WoodCharles J. WylieDonald W. Zipse*Member emeritusviCLAUSE PAGE1. Scope and Purpose 12. Definitions.13. References.24. Design of Electric Heat Tracing Systems .34.1 Identification of Requirements. 34.2 Heater
41、 Design Considerations 94.3 Power System Design Considerations . 144.4 Temperature Control Considerations . 154.5 Alarm Considerations 184.6 Finished Drawings and Documents . 204.7 Test Considerations 205. Installation of Electric Heat Tracing Systems.215.1 Distribution and Use of Drawings at the In
42、stallation Site . 215.2 Receiving of Materials . 215.3 Installation of Materials . 215.4 Startup Testing for Critical Process Control Systems 226. Maintenance of Electric Heat Tracing Systems 236.1 Record Keeping 236.2 Heater, Alarm, and Temperature Controller Circuit Checks . 246.3 Inspections . 24
43、6.4 Periodic Testing . 24Annex A (Informative) Temperature and Solubility Tables of Borated Water, Caustic Soda,and Sodium Pentaborate Systems 25Annex B (Informative) The Function of Electric Heat Tracing Systems Required to Support EngineeredSafety Features Piping Systems.27Annex C (Informative) El
44、ectric Heat Tracing Requirements for Post-Accident Sampling Systems in Nuclear Power Generating Stations 31Copyright 1987 IEEE All Rights Reserved 1IEEE Recommended Practice for the Design and Installation of Electric Heat Tracing Systems for Nuclear Power Generating Stations1. Scope and PurposeThis
45、 document provides recommended practices for designing and installing electric heat tracing systems in nuclearpower generating stations. These electric heat tracing systems are applied, both for critical process temperature controland for process temperature control, on mechanical piping systems tha
46、t carry borated water, caustic soda, and othersolutions. Electric heat tracing systems are also applied on water piping systems to prevent them from freezing in coldweather. The recommendations include identification of requirements, heater design considerations, power systemsdesign considerations,
47、temperature control considerations, alarm considerations, finished drawings and documents,installation of materials, startup testing, temperature tests, and maintenance of electric pipe heating systems.The purpose of this document is to provide recommendations that may be used in the design, install
48、ation, andmaintenance of electric heat tracing systems as applied to mechanical piping systems. These recommendations areintended to ensure that the piping systems will be maintained at specified operating temperatures, which in turn willensure that the piping systems fluids will be available not on
49、ly during station operation but also during normal andemergency shutdown.2. DefinitionsThe following definitions apply specifically to the subject matter in this recommended practice. In some cases, morethan one term or phrase is defined because in industry practice the terms or phrases are used interchangeably.Additional definitions of terms or phrases used in this document may be found by referring to ANSI/IEEE Std 100-1984 2.1base line data: Information retained for the purpose of evaluation against repeated information in order to establishtrends in parameters.1The numbers in
