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IEEE 622

Recommended Practice for the Design and Installation of Electric Heat Tracing Systems for Nuclear Power Generating Stations

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Organization: IEEE
Publication Date: 1 January 1987
Status: active
Page Count: 38
scope:

(This Foreword is not a part of IEEE Std 622-1987, IEEE Recommended Practice for the Design and Installation of Electric Heat Tracing Systems for Nuclear Power Generation Stations.)

The realization that electric heat tracing systems play an important role in the normal operation of both nuclear and non-nuclear processes in nuclear power generating stations has now come of age. This is apparent by the increased amount of space being devoted to electric heat tracing in station technical specifications, system descriptions, and operating criteria. Such electric heat tracing systems are applied on borated water systems and on water treatment systems such as caustic. Since boric acid and caustics in water will crystalize or precipitate out of the solution depending on their concentrations at temperatures above ambient, and since such crystallization can make the piping system inoperable for normal operation, electric heat tracing systems are required to keep the solutions and piping systems in a state to perform their intended functions. Electric heat tracing systems may also be applied on piping located outdoors at nuclear generating stations for the purpose of preventing the piping systems from freezing. It should be noted that each and all of these piping systems can include valves, pumps, strainers, tanks, and instrumentation components that can be rendered inoperable due to solutions crystallizing or freezing. Therefore, a definite need exists within the power industry for recommendations that provide a uniform method for the design and installation of electric heat tracing systems that meet the requirements for rendering reliable operation of the piping system. 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 reactor (BWR) nuclear generating stations. Breeder reactors and other types of applications are outside the scope of this document. Also, the principles in this document are applicable to all types of generating stations, for example, fossil, hydroelectric, etc. Presented herein are such recommendations and topics as identification of 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 the systems, and maintenance considerations.

Since electric heat tracing systems are interrelated with electric power and alarm systems, other IEEE standards should be referred to when using this recommended practice. The recommendations presented herein are not intended to supersede any current IEEE standards or practices, and sound engineering judgment should always be used when applying 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 recommended practice along with alarm considerations. This document recommends that electric heat tracing systems not be classified as Class lE systems and that critical process control systems be powered from reliable station power sources. If these reliable power sources are the engineered safety features (ESF) buses, then the electric heat tracing systems should be powered through suitable isolation devices in accordance with ANSI/IEEE Std 308-1980, IEEE Standard Criteria for Class lE Power Systems for Nuclear Power Generating Stations, and ANSI/IEEE Std 384-1981, IEEE Standard Criteria for Independence 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 evidence that a properly designed system would come under a Class lE classification for proper performance. Electric heat tracing systems that are applied on reactor injection piping systems do not perform any safety functions either during or after a postulated loss-of-coolant accident (LOCA). Instead, electric heat tracing systems render such piping systems operable during normal station operation and thus are not needed during or after a postulated LOCA. For further discussion and technical explanations on normal and accident station operations with respect to nonClass lE electric heat tracing systems, reference should be made to Appendix B of this document.

An exception to this recommendation is the classification of electric heat tracing systems applied on post-accident sampling systems. Such post-accident sampling systems were mandated by the Nuclear Regulatory Commission as part of the Three Mile Island Unit 2 retrofit 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 rigid procedure manual. The document was prepared by the working group on Electric Heat Tracing Systems, which was formed 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. Baen

H. Caldwell

J. J. Dennehy

E. Janus

M. Plant

D. E. Roberts

H. Romanowski

R. Schilling

R. S. Schoellkopf

The working group would like to offer a special acknowledgement to past members who participated in the writing of the original ANSI/IEEE Std 622-1979 : G. P. Alexander, R. O. Bylin, W. C. Leslie, J. T. Mattox, R. A. McInturff, and R. M. Oehlschlaeger.

At the time this document was approved, the members of the Station Design Subcommittee were:

D. E. Roberts, Chair

W. W. Avril

M. S. Baldwin

J. H. Bellack

R. O. Bylin

J. B. Cannon

J. W. Colwell

R. E. Cotta

G. R. Engman

W. M. Fenner

R. E. Fenton

J. J. Heagerty

M. E. Jackowski

R. I. Longwell

O. S. Mazzoni

M. W. Migliaro

S. Nikolakakos

E. L. Owen

J. L. Parris

R. E. Penn

C. R. Pope

E. P. Rothong

C. L. Sandberg

J. M. Sappington

C. Sclafani

R. G. Scott

M. N. Sprouse

J. E. Stoner, Jr.

R. E. Strasser

J. B. Sullivan

H. E. Yocum, Jr.

R. Zweigler

At the time this document was approved, the members of the Power Generation Committee were:

R. W. Cantrell, Chair

R. E. Cotta, Vice Chair

M. W. Migliaro, Secretary

W. W. Avril

M. S. Baldwin

J. H. Bellack

I. B. Berezowsky

F. L. Brennan

L. D. Boydstun

G. G. Boyle

S. R. Brockschink

P. G. Brown

J. B. Cannon

E. F. Chelotti

H. E. Church, Jr

C. H. Clarridge

R. S. Coleman

R. E. Cotta

M. L. Crenshaw

D. J. Damsker

R. S. Darke

P. Davidson

D. Diamant*

G. R. Engman

W. H. Esselman

T. F. Faulkner

W. M. Fenner

A. H. Ferber

W. A. Frederick

R. N. Friedman

D. I. Gorden

R. K. Gupta

R. D. Handel

J. J. Heagerty

M. E. Jackowski

W. D. Jackson

N. Jaleeli

J. H. Jones

E. F. Kaprielian

J. Kariger

F. Keay

C. E. Kneeburg

S. Kuznetsov

P. R. Landrieu

S. Law

P. Lewis

H. E. Lokay

G. L. Lurj

J. T. Madill

J. D. Mather

O. S. Mazzoni

T. M. McMahon

G. R. Meloy

D. H. Miller

J. L. Mills

W. S. Morgan

P. A. Nevins

S. Nikolakakos

J. T. Nikolas

M. I. Olken

R. E. Penn

R. Ramakumar

R. J. Reiman

D. E. Roberts

R. G. Scott

A. J. Spurgin

R. B. Squires

J. V. Stephens

G. I. Stillman

J. E. Stoner, Jr

J. B. Sullivan

V. C. Sulzberger

S. Tjepkema

R. H. Waltman

E. J. Warchol

M. Warren

K. L. West

T. R. Whittemore

J. P. Whooley

R. F. Willett

C. J. Wylie

T. D. Younkins

*Past chairman

The following persons were on the balloting committee that approved this document for submission to the IEEE Standards Board:

W. W. Avril

M. S. Baldwin

J. H. Bellack

I. B. Berezowsky

G. Berman

R. W. Cantrell

H. E. Church

R. S. Coleman

R. E. Cotta

M. L. Crenshaw

D. J. Damsker

P. M. Davidson

G. R. Engmann

W. M. Fenner

A. H. Ferber

D. I. Gorden

R. D. Handel

J. H. Jones

F. W. Keay

P. R. Landrieu

G. L. Luri

J. T. Madill

O. S. Mazzoni

M. W. Migliaro

J. T. Nikolas

R. E. Penn

J. D. Plaxco

R. J. Reiman

D. E. Roberts

R. G. Scott

A. J. Spurgin

G. I. Stillman

J. E. Stoner, Jr

J. B. Sullivan

T. R. Whittemore

J. P. Wooley

When the IEEE Standards Board approved this standard on December 11, 1986, it had the following membership:

John E. May, Chair

Irving Kolodny, Vice Chair

Sava I. Sherr, Secretary

James H. Beall

Fletcher J. Buckley

Paul G. Cummings

Donald C. Fleckenstein

Jay Forster

Daniel L. Goldberg

Kenneth D. Hendrix

Irvin N. Howell

Jack Kinn

Joseph L. Koepfinger*

Edward Lohse

Lawrence V. McCall

Donald T. Michael*

Marco W. Migliaro

Stanley Owens

John P. Riganati

Frank L. Rose

Robert E. Rountree

Martha Sloan

Oley Wanaselja

J. Richard Weger

William B. Wilkens

Helen M. Wood

Charles J. Wylie

Donald W. Zipse

*Member emeritus

Scope

This document provides recommended practices for designing and installing electric heat tracing systems in nuclear power generating stations. These electric heat tracing systems are applied, both for critical process temperature control and for process temperature control, on mechanical piping systems that carry borated water, caustic soda, and other solutions. Electric heat tracing systems are also applied on water piping systems to prevent them from freezing in cold weather. The recommendations include identification of requirements, heater design considerations, power systems design considerations, 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, installation, and maintenance of electric heat tracing systems as applied to mechanical piping systems. These recommendations are intended to ensure that the piping systems will be maintained at specified operating temperatures, which in turn will ensure that the piping systems' fluids will be available not only during station operation but also during normal and emergency shutdown.

Document History

January 1, 1987
Recommended Practice for the Design and Installation of Electric Heat Tracing Systems for Nuclear Power Generating Stations
Scope and Purpose This document provides recommended practices for designing and installing electric heat tracing systems in nuclear power generating stations. These electric heat tracing systems...
IEEE 622
January 1, 1987
Recommended Practice for the Design and Installation of Electric Heat Tracing Systems for Nuclear Power Generating Stations
(This Foreword is not a part of IEEE Std 622-1987, IEEE Recommended Practice for the Design and Installation of Electric Heat Tracing Systems for Nuclear Power Generation Stations.) The realization...
November 19, 1979
RECOMMENDED PRACTICE FOR THE DESIGN AND INSTALLATION OF ELECTRIC PIPE HEATING SYSTEMS FOR NUCLEAR POWER GENERATING STATIONS
A description is not available for this item.

References

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