Prevention of stress corrosion cracking in piping welds

Erkki Muttilainen, Ossi Hietanen, Pentti Aaltonen, Ulla Ehrnsten

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Stress corrosion cracking in piping welds in boiling water reactors (BWR's) has been observed in stainless steels as well as in low alloyed ferritic steels. Cracks in welded austenitic stainless steel piping in BWR's have been a serious problem in early operational years of nuclear power plants. Intergranular stress corrosion cracking (IGSCC) incidents of large diameter pipes have had an impact on plant availability and economics and defects are considered also as a safety hazard. The number of welds in connection to large diameter pipes is about 250 per unit, with a large wall thickness, about 30 mm in average, making inspection requirements stringent. SCC has been concentrated in the same systems in the power plants all over the world, namely reactor water cleanup systems, core spray and all lines of main re-circulation lines operating at high temperatures. In order to evaluate the rate of failures and the related safety risk, cracking mechanisms effective in different materials have been analysed and remedial actions have been evaluated.
Original languageEnglish
Title of host publicationPlant Life Management
Subtitle of host publicationMidterm status of a R&D project
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages159-168
ISBN (Electronic)951-38-5728-X
ISBN (Print)951-38-5727-1
Publication statusPublished - 2001
MoE publication typeA4 Article in a conference publication
EventPlant Life Management: Midterm status of a R&D project - Espoo, Finland
Duration: 1 Jan 20011 Jan 2001

Publication series

NameVTT Symposium
PublisherVTT
Number218
ISSN (Print)0357-9387
ISSN (Electronic)1455-0873

Conference

ConferencePlant Life Management
CountryFinland
CityEspoo
Period1/01/011/01/01

Fingerprint

Boiling water reactors
Stress corrosion cracking
Welds
Pipe
Ferritic steel
Austenitic stainless steel
Nuclear power plants
Hazards
Power plants
Stainless steel
Inspection
Availability
Cracks
Defects
Economics
Water
Temperature

Keywords

  • welding

Cite this

Muttilainen, E., Hietanen, O., Aaltonen, P., & Ehrnsten, U. (2001). Prevention of stress corrosion cracking in piping welds. In Plant Life Management: Midterm status of a R&D project (pp. 159-168). Espoo: VTT Technical Research Centre of Finland. VTT Symposium, No. 218
Muttilainen, Erkki ; Hietanen, Ossi ; Aaltonen, Pentti ; Ehrnsten, Ulla. / Prevention of stress corrosion cracking in piping welds. Plant Life Management: Midterm status of a R&D project. Espoo : VTT Technical Research Centre of Finland, 2001. pp. 159-168 (VTT Symposium; No. 218).
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abstract = "Stress corrosion cracking in piping welds in boiling water reactors (BWR's) has been observed in stainless steels as well as in low alloyed ferritic steels. Cracks in welded austenitic stainless steel piping in BWR's have been a serious problem in early operational years of nuclear power plants. Intergranular stress corrosion cracking (IGSCC) incidents of large diameter pipes have had an impact on plant availability and economics and defects are considered also as a safety hazard. The number of welds in connection to large diameter pipes is about 250 per unit, with a large wall thickness, about 30 mm in average, making inspection requirements stringent. SCC has been concentrated in the same systems in the power plants all over the world, namely reactor water cleanup systems, core spray and all lines of main re-circulation lines operating at high temperatures. In order to evaluate the rate of failures and the related safety risk, cracking mechanisms effective in different materials have been analysed and remedial actions have been evaluated.",
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Muttilainen, E, Hietanen, O, Aaltonen, P & Ehrnsten, U 2001, Prevention of stress corrosion cracking in piping welds. in Plant Life Management: Midterm status of a R&D project. VTT Technical Research Centre of Finland, Espoo, VTT Symposium, no. 218, pp. 159-168, Plant Life Management, Espoo, Finland, 1/01/01.

Prevention of stress corrosion cracking in piping welds. / Muttilainen, Erkki; Hietanen, Ossi; Aaltonen, Pentti; Ehrnsten, Ulla.

Plant Life Management: Midterm status of a R&D project. Espoo : VTT Technical Research Centre of Finland, 2001. p. 159-168 (VTT Symposium; No. 218).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

TY - GEN

T1 - Prevention of stress corrosion cracking in piping welds

AU - Muttilainen, Erkki

AU - Hietanen, Ossi

AU - Aaltonen, Pentti

AU - Ehrnsten, Ulla

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Y1 - 2001

N2 - Stress corrosion cracking in piping welds in boiling water reactors (BWR's) has been observed in stainless steels as well as in low alloyed ferritic steels. Cracks in welded austenitic stainless steel piping in BWR's have been a serious problem in early operational years of nuclear power plants. Intergranular stress corrosion cracking (IGSCC) incidents of large diameter pipes have had an impact on plant availability and economics and defects are considered also as a safety hazard. The number of welds in connection to large diameter pipes is about 250 per unit, with a large wall thickness, about 30 mm in average, making inspection requirements stringent. SCC has been concentrated in the same systems in the power plants all over the world, namely reactor water cleanup systems, core spray and all lines of main re-circulation lines operating at high temperatures. In order to evaluate the rate of failures and the related safety risk, cracking mechanisms effective in different materials have been analysed and remedial actions have been evaluated.

AB - Stress corrosion cracking in piping welds in boiling water reactors (BWR's) has been observed in stainless steels as well as in low alloyed ferritic steels. Cracks in welded austenitic stainless steel piping in BWR's have been a serious problem in early operational years of nuclear power plants. Intergranular stress corrosion cracking (IGSCC) incidents of large diameter pipes have had an impact on plant availability and economics and defects are considered also as a safety hazard. The number of welds in connection to large diameter pipes is about 250 per unit, with a large wall thickness, about 30 mm in average, making inspection requirements stringent. SCC has been concentrated in the same systems in the power plants all over the world, namely reactor water cleanup systems, core spray and all lines of main re-circulation lines operating at high temperatures. In order to evaluate the rate of failures and the related safety risk, cracking mechanisms effective in different materials have been analysed and remedial actions have been evaluated.

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M3 - Conference article in proceedings

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T3 - VTT Symposium

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BT - Plant Life Management

PB - VTT Technical Research Centre of Finland

CY - Espoo

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Muttilainen E, Hietanen O, Aaltonen P, Ehrnsten U. Prevention of stress corrosion cracking in piping welds. In Plant Life Management: Midterm status of a R&D project. Espoo: VTT Technical Research Centre of Finland. 2001. p. 159-168. (VTT Symposium; No. 218).