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Title: Life extension of elevated-temperature reactors considering actual operating conditions

Abstract

Many reactors have experienced operating conditions less severe than those specified in the design. Their actual operating conditions may involve fewer or less severe transients, lower operating temperatures, or a combination of these. Thus the actual operating conditions become important considerations in efforts to extend the life of reactor components. If the number of transients experienced is fewer than the number specified in the design, the actual transients must be reconstructed to determine extended life. When operating temperature is below 800 [degrees]F, fatigue damage becomes the controlling factor in life assessment. At operating temperatures above 800 [degrees]F (e.g., breeder reactors), creep damage becomes another controlling factor because residual stresses have a longer time for relaxation, a fact that will reduce creep damage. This study presents an approach to assessing the life of breeder reactor components when the actual transients are fewer in number than those specified in the design. It also discusses the sensitivity of creep-fatigue damage in such factors when actual operating temperatures and the actual severity of transients fall below the design specifications.

Authors:
Publication Date:
Research Org.:
Westinghouse Hanford Co., Richland, WA (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
6633337
Report Number(s):
WHC-SA-1695; CONF-930702-6
ON: DE93006886
DOE Contract Number:  
AC06-87RL10930
Resource Type:
Conference
Resource Relation:
Conference: Pressure vessel and piping conference, Denver, CO (United States), 25-29 Jul 1993
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; LMFBR TYPE REACTORS; REACTOR COMPONENTS; NUCLEAR POWER PLANTS; SERVICE LIFE; CREEP; FATIGUE; REACTOR OPERATION; STRESSES; TEMPERATURE EFFECTS; TRANSIENTS; BREEDER REACTORS; EPITHERMAL REACTORS; FAST REACTORS; FBR TYPE REACTORS; LIFETIME; LIQUID METAL COOLED REACTORS; MECHANICAL PROPERTIES; NUCLEAR FACILITIES; OPERATION; POWER PLANTS; REACTORS; THERMAL POWER PLANTS; 210500* - Power Reactors, Breeding

Citation Formats

Ziada, H H. Life extension of elevated-temperature reactors considering actual operating conditions. United States: N. p., 1993. Web.
Ziada, H H. Life extension of elevated-temperature reactors considering actual operating conditions. United States.
Ziada, H H. 1993. "Life extension of elevated-temperature reactors considering actual operating conditions". United States.
@article{osti_6633337,
title = {Life extension of elevated-temperature reactors considering actual operating conditions},
author = {Ziada, H H},
abstractNote = {Many reactors have experienced operating conditions less severe than those specified in the design. Their actual operating conditions may involve fewer or less severe transients, lower operating temperatures, or a combination of these. Thus the actual operating conditions become important considerations in efforts to extend the life of reactor components. If the number of transients experienced is fewer than the number specified in the design, the actual transients must be reconstructed to determine extended life. When operating temperature is below 800 [degrees]F, fatigue damage becomes the controlling factor in life assessment. At operating temperatures above 800 [degrees]F (e.g., breeder reactors), creep damage becomes another controlling factor because residual stresses have a longer time for relaxation, a fact that will reduce creep damage. This study presents an approach to assessing the life of breeder reactor components when the actual transients are fewer in number than those specified in the design. It also discusses the sensitivity of creep-fatigue damage in such factors when actual operating temperatures and the actual severity of transients fall below the design specifications.},
doi = {},
url = {https://www.osti.gov/biblio/6633337}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1993},
month = {Fri Jan 01 00:00:00 EST 1993}
}

Conference:
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