Effect of Residual Stress of Dissimilar Metal Welding on Stress Corrosion Cracking of Bottom-Mounted Instrumentation Penetration Mock-Up

Kim, S.-W.; Kim, H.-P.; Jeong, Jae-Uk; Chang, Yoon‐Suk

doi:10.5006/1.3500834

Cited by 8 publications

(4 citation statements)

References 11 publications

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“…Kim et al [12] performed FE analyses for the BMI mockup specimens and identified that the PWSCC behaviour of the sensitized Alloy 600 nozzle in the mock-up was closely related with the characteristics of the residual stresses derived from the FE analyses. Bae et al [13] conducted detailed FE simulations in order to predict the magnitudes of the weld residual stresses in the control rod drive mechanism (CRDM) penetration nozzles and to investigate effects of the FE analysis and welding variables on the welding residual stresses.…”

Section: Introductionmentioning

confidence: 98%

“…The previous studies have been widely performed about welding residual stresses and PWSCC growth of the various primary components [4][5][6][7][8][9][10][11][12][13][14][15]. Electric Power Research Institute (EPRI) [4] derived residual stress distributions in the dissimilar metal butt weld of the various primary component nozzles such pressurizer surge nozzle and RPV outlet nozzle via finite element (FE) analyses, and investigated effects of inner repair welding, overlay welding and external piping loads on the residual stresses via parametric analysis.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the effects of geometric variables on the residual stresses and PWSCC growth in the RPV BMI penetration nozzles

Kim

Lee

2015

J Mech Sci Technol

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This study investigated the effects of various geometric variables on the residual stresses and PWSCC growth of RPV BMI penetration nozzles. An FE residual stress analysis procedure was developed and validated from the viewpoint of FFS assessment. The validated FE residual stress analysis procedure and the PWSCC growth assessment procedure in the ASME B&PV Code, Sec.XI were applied to the BMI penetration nozzles with specified ranges of the geometric variables. The total stresses at steady state during normal operation including welding residual stresses increase with increasing inclination angle of the BMI nozzles, and with tilt angle, depth, and root width of the J-groove weld. The lifetime from the assumed initial crack to the acceptance criteria according to the ASME B&PV Code, Sec.XI also decreases under these conditions. The total stresses decrease and the lifetime increases with increasing nozzle thickness, but outer radius of the BMI nozzles has an insignificant effect on both of these factors.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Investigation on the effects of geometric variables on the residual stresses and PWSCC growth in the RPV BMI penetration nozzles

Kim

Lee

2015

J Mech Sci Technol

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“…It is widely known that stress corrosion cracking (SCC) can result in loss-of-coolant accidents in nuclear reactors (Scott and Meunier 2007, Lunceford, DeWees et al 2013, Kim and Do 2015. Thus, the prediction of the SCC initiation time is a very important task for several researchers in nuclear science.…”

Section: Introductionmentioning

confidence: 99%

A Statistical Analysis on Modeling Uncertainty Through Crack Initiation Tests

Park,

Bahn

2017

PHMAP_CONF

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Because a large time spread in most crack initiation tests makes it a daunting task to predict the initiation time of cracking, a probabilistic model, such as the Weibull distribution, has been usually employed to model it. In thiscase, although it might be anticipated to develop a more reliable cracking model under ideal cracking test conditions (e.g., large number of specimen, narrow censoring interval, etc.), it is not straightforward to quantitatively assess the effects of these experimental conditions on model estimation uncertainty. Therefore, we studied the effects of some key experimental conditions on estimation uncertainties of the Weibull parameters through the Monte Carlo simulations. Simulation results suggested that the estimated scale parameter would be more reliable than the estimated shape parameter from the tests. It was also shown that increasing the number of specimen would be more efficient to reduce the uncertainty of estimators than the more frequent censoring.

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“…General SCC formation methods are shown in Table I. Most SCC specimens are of Type (1) produced by acceleration test, which uses a chemical solution, such as tetrathionate (K 2 S 4 O 6 , Na 2 S 4 O 6 ), 23,24) thiosulfate (Na 2 S 2 O 3 ), 25) magnesium chloride (MgCl 2 ), 18,21) or sodium chloride (NaCl) 26) solution, instead of hightemperature pressurized water (HTPW). The formation of Type (1) SCCs is relatively easy because it does not require an autoclave that can sustain HTPW.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Closed Stress Corrosion Cracks in Ni-Based Alloy Weld Metal Using Subharmonic Phased Array

Horinouchi

Ikeuchi

Shintaku

et al. 2012

Jpn. J. Appl. Phys.

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Closed stress corrosion cracks (SCCs) have been generated in Ni-based alloy weld metal in nuclear power plants. The ultrasonic inspection is difficult because of the crack closure. For the application of new inspection methods and training/educating of inspection engineers, realistic closed SCC specimens are required. However, there is no means for forming such SCC specimens in a reasonable amount of time. Here, we present a two-step method. The first step is to form an open SCC in chemical solution. The second step is to close the SCC by generating oxide films between the crack faces in high-temperature pressurized water (HTPW). To verify the crack closure, we used a closed-crack imaging apparatus, the subharmonic phased array for crack evaluation (SPACE). Consequently, we found that parts of the SCC after 1321 h immersion were closed in the HTPW. Thus, we verified the two-step method for forming realistic closed SCC specimens in a reasonable amount of time.

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Effect of Residual Stress of Dissimilar Metal Welding on Stress Corrosion Cracking of Bottom-Mounted Instrumentation Penetration Mock-Up

Cited by 8 publications

References 11 publications

Investigation on the effects of geometric variables on the residual stresses and PWSCC growth in the RPV BMI penetration nozzles

Investigation on the effects of geometric variables on the residual stresses and PWSCC growth in the RPV BMI penetration nozzles

A Statistical Analysis on Modeling Uncertainty Through Crack Initiation Tests

Evaluation of Closed Stress Corrosion Cracks in Ni-Based Alloy Weld Metal Using Subharmonic Phased Array

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