Exploratory analysis to estimate axial fracture toughness for ZR-2.5NB pressure tubes using test data from small curved compact specimens

Steven X. Xu; Kim Wallin

doi:10.1115/PVP2017-66116

Exploratory analysis to estimate axial fracture toughness for ZR-2.5NB pressure tubes using test data from small curved compact specimens

Steven X. Xu
, Kim Wallin

Kinectrics Inc.

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

3 Citations (Scopus)

Abstract

Zr-2.5Nb pressure tubes are in-core, primary coolant containment of CANDU(1) nuclear reactors. Technical requirements for in-service evaluation of pressure tubes are provided in the Canadian Standards Associate (CSA) N285.8. These requirements include the evaluation of service conditions for protection against fracture of operating pressure tubes and demonstration of leakbefore-break. Axial fracture toughness for pressure tubes is a key input in the evaluation of fracture protection and leak-before-break. The 2015 Edition of CSA N285.8 provides a pressure tube axial fracture toughness prediction model that is applicable to pressure tubes late life conditions. The fracture toughness prediction model in CSA N285.8-15 is based on rising pressure burst tests performed on pressure tube sections with axial cracks under simulated pressure tube late life conditions. Due to the associated high cost of testing and high consumption of pressure tube material, it is not practical to perform a large number of fracture toughness burst tests. On the other hand, more fracture toughness data is required to improve the existing pressure tube axial fracture toughness prediction model. There is strong motivation to estimate pressure tube axial fracture toughness using test data from small specimens. The estimated pressure tube fracture toughness using test data from small specimens can fill the gaps in the burst test toughness data, as well as provide information on material variability and data scatter. Against this background, an exploratory analysis of estimating pressure tube axial fracture toughness using test data from small curved compact specimens has been performed and is described in this paper. The estimated values of pressure tube axial fracture toughness using the test data from small curved compact specimens are compared with the measured toughness from burst tests of pressure tube sections with axial cracks to check the feasibility of this approach.

Original language	English
Title of host publication	ASME 2017 Pressure Vessels and Piping Conference
Subtitle of host publication	Codes and Standards
Publisher	American Society of Mechanical Engineers (ASME)
Number of pages	10
Volume	1A
ISBN (Print)	978-0-7918-5790-8
DOIs	https://doi.org/10.1115/PVP2017-66116
Publication status	Published - 1 Jan 2017
MoE publication type	A4 Article in a conference publication
Event	ASME 2017 Pressure Vessels and Piping Conference, PVP 2017 - Waikoloa, United States Duration: 16 Jul 2017 → 20 Jul 2017

Conference

Conference	ASME 2017 Pressure Vessels and Piping Conference, PVP 2017
Country/Territory	United States
City	Waikoloa
Period	16/07/17 → 20/07/17

Funding

The work was funded by CANDU Owners Group. Jun Cui provided J-R curves for the two sets of curved compact tests on material samples from Tubes A and B for the exploratory analysis. Valuable discussions with Brian Leitch are acknowledged as well.

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10.1115/PVP2017-66116

Cite this

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title = "Exploratory analysis to estimate axial fracture toughness for ZR-2.5NB pressure tubes using test data from small curved compact specimens",

abstract = "Zr-2.5Nb pressure tubes are in-core, primary coolant containment of CANDU(1) nuclear reactors. Technical requirements for in-service evaluation of pressure tubes are provided in the Canadian Standards Associate (CSA) N285.8. These requirements include the evaluation of service conditions for protection against fracture of operating pressure tubes and demonstration of leakbefore-break. Axial fracture toughness for pressure tubes is a key input in the evaluation of fracture protection and leak-before-break. The 2015 Edition of CSA N285.8 provides a pressure tube axial fracture toughness prediction model that is applicable to pressure tubes late life conditions. The fracture toughness prediction model in CSA N285.8-15 is based on rising pressure burst tests performed on pressure tube sections with axial cracks under simulated pressure tube late life conditions. Due to the associated high cost of testing and high consumption of pressure tube material, it is not practical to perform a large number of fracture toughness burst tests. On the other hand, more fracture toughness data is required to improve the existing pressure tube axial fracture toughness prediction model. There is strong motivation to estimate pressure tube axial fracture toughness using test data from small specimens. The estimated pressure tube fracture toughness using test data from small specimens can fill the gaps in the burst test toughness data, as well as provide information on material variability and data scatter. Against this background, an exploratory analysis of estimating pressure tube axial fracture toughness using test data from small curved compact specimens has been performed and is described in this paper. The estimated values of pressure tube axial fracture toughness using the test data from small curved compact specimens are compared with the measured toughness from burst tests of pressure tube sections with axial cracks to check the feasibility of this approach.",

author = "Xu, \{Steven X.\} and Kim Wallin",

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Xu, SX & Wallin, K 2017, Exploratory analysis to estimate axial fracture toughness for ZR-2.5NB pressure tubes using test data from small curved compact specimens. in ASME 2017 Pressure Vessels and Piping Conference: Codes and Standards. vol. 1A, PVP2017-66116, American Society of Mechanical Engineers (ASME), ASME 2017 Pressure Vessels and Piping Conference, PVP 2017, Waikoloa, United States, 16/07/17. https://doi.org/10.1115/PVP2017-66116

Exploratory analysis to estimate axial fracture toughness for ZR-2.5NB pressure tubes using test data from small curved compact specimens. / Xu, Steven X.; Wallin, Kim.
ASME 2017 Pressure Vessels and Piping Conference: Codes and Standards. Vol. 1A American Society of Mechanical Engineers (ASME), 2017. PVP2017-66116.

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

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AU - Xu, Steven X.

AU - Wallin, Kim

PY - 2017/1/1

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N2 - Zr-2.5Nb pressure tubes are in-core, primary coolant containment of CANDU(1) nuclear reactors. Technical requirements for in-service evaluation of pressure tubes are provided in the Canadian Standards Associate (CSA) N285.8. These requirements include the evaluation of service conditions for protection against fracture of operating pressure tubes and demonstration of leakbefore-break. Axial fracture toughness for pressure tubes is a key input in the evaluation of fracture protection and leak-before-break. The 2015 Edition of CSA N285.8 provides a pressure tube axial fracture toughness prediction model that is applicable to pressure tubes late life conditions. The fracture toughness prediction model in CSA N285.8-15 is based on rising pressure burst tests performed on pressure tube sections with axial cracks under simulated pressure tube late life conditions. Due to the associated high cost of testing and high consumption of pressure tube material, it is not practical to perform a large number of fracture toughness burst tests. On the other hand, more fracture toughness data is required to improve the existing pressure tube axial fracture toughness prediction model. There is strong motivation to estimate pressure tube axial fracture toughness using test data from small specimens. The estimated pressure tube fracture toughness using test data from small specimens can fill the gaps in the burst test toughness data, as well as provide information on material variability and data scatter. Against this background, an exploratory analysis of estimating pressure tube axial fracture toughness using test data from small curved compact specimens has been performed and is described in this paper. The estimated values of pressure tube axial fracture toughness using the test data from small curved compact specimens are compared with the measured toughness from burst tests of pressure tube sections with axial cracks to check the feasibility of this approach.

AB - Zr-2.5Nb pressure tubes are in-core, primary coolant containment of CANDU(1) nuclear reactors. Technical requirements for in-service evaluation of pressure tubes are provided in the Canadian Standards Associate (CSA) N285.8. These requirements include the evaluation of service conditions for protection against fracture of operating pressure tubes and demonstration of leakbefore-break. Axial fracture toughness for pressure tubes is a key input in the evaluation of fracture protection and leak-before-break. The 2015 Edition of CSA N285.8 provides a pressure tube axial fracture toughness prediction model that is applicable to pressure tubes late life conditions. The fracture toughness prediction model in CSA N285.8-15 is based on rising pressure burst tests performed on pressure tube sections with axial cracks under simulated pressure tube late life conditions. Due to the associated high cost of testing and high consumption of pressure tube material, it is not practical to perform a large number of fracture toughness burst tests. On the other hand, more fracture toughness data is required to improve the existing pressure tube axial fracture toughness prediction model. There is strong motivation to estimate pressure tube axial fracture toughness using test data from small specimens. The estimated pressure tube fracture toughness using test data from small specimens can fill the gaps in the burst test toughness data, as well as provide information on material variability and data scatter. Against this background, an exploratory analysis of estimating pressure tube axial fracture toughness using test data from small curved compact specimens has been performed and is described in this paper. The estimated values of pressure tube axial fracture toughness using the test data from small curved compact specimens are compared with the measured toughness from burst tests of pressure tube sections with axial cracks to check the feasibility of this approach.

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DO - 10.1115/PVP2017-66116

M3 - Conference article in proceedings

AN - SCOPUS:85034047072

SN - 978-0-7918-5790-8

VL - 1A

BT - ASME 2017 Pressure Vessels and Piping Conference

PB - American Society of Mechanical Engineers (ASME)

T2 - ASME 2017 Pressure Vessels and Piping Conference, PVP 2017

Y2 - 16 July 2017 through 20 July 2017

ER -

Exploratory analysis to estimate axial fracture toughness for ZR-2.5NB pressure tubes using test data from small curved compact specimens

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