Abstract
Flow Accelerated Corrosion (FAC) has been identified as the main cause of wall thinning in outlet feeder elbows. The calculated thinning rates were based on nominal initial wall thickness and measured wall thickness values. A linear wall thinning rate was assumed due to the limited amount of available data, resulting in very high thinning rates in some cases compared to similar units (Pickering B). There are unit to unit differences in the wall thinning rates and hence a variation in the number of outlet elbows with less than 10 years remaining life. An alternative method, the CANDU Primary Side FAC Rate Model, was used to assure that the remaining life calculations are realistic and conservative. The predicted rates agree well with calculated rates from plant data for 2-inch feeders but are much lower for 2.5-inch feeders. Analysis of plant data and operation history supported the hypothesis that the wide distribution in thinning rates in units with nominally the same primary heat transport system (HTS) conditions was due to a significant range of initial wall thickness and the application of CAN-DECON. Future inspection data after restart will reduce the error due to the linear assumption for the calculated thinning rate and
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Lee, W;
Schefski, C;
Lau, T;
Floyd, P
[1]
- Ontario Power Generation, Components and Equipment Dept., Pickering A, Pickering, Ontario (Canada)
Citation Formats
Lee, W, Schefski, C, Lau, T, and Floyd, P.
Remaining life assessment of Pickering a primary heat transport outlet feeder elbows.
Canada: N. p.,
2003.
Web.
Lee, W, Schefski, C, Lau, T, & Floyd, P.
Remaining life assessment of Pickering a primary heat transport outlet feeder elbows.
Canada.
Lee, W, Schefski, C, Lau, T, and Floyd, P.
2003.
"Remaining life assessment of Pickering a primary heat transport outlet feeder elbows."
Canada.
@misc{etde_20617865,
title = {Remaining life assessment of Pickering a primary heat transport outlet feeder elbows}
author = {Lee, W, Schefski, C, Lau, T, and Floyd, P}
abstractNote = {Flow Accelerated Corrosion (FAC) has been identified as the main cause of wall thinning in outlet feeder elbows. The calculated thinning rates were based on nominal initial wall thickness and measured wall thickness values. A linear wall thinning rate was assumed due to the limited amount of available data, resulting in very high thinning rates in some cases compared to similar units (Pickering B). There are unit to unit differences in the wall thinning rates and hence a variation in the number of outlet elbows with less than 10 years remaining life. An alternative method, the CANDU Primary Side FAC Rate Model, was used to assure that the remaining life calculations are realistic and conservative. The predicted rates agree well with calculated rates from plant data for 2-inch feeders but are much lower for 2.5-inch feeders. Analysis of plant data and operation history supported the hypothesis that the wide distribution in thinning rates in units with nominally the same primary heat transport system (HTS) conditions was due to a significant range of initial wall thickness and the application of CAN-DECON. Future inspection data after restart will reduce the error due to the linear assumption for the calculated thinning rate and further clarify the wide distribution in thinning rates in units with nominally the same HTS conditions. (author)}
place = {Canada}
year = {2003}
month = {Jul}
}
title = {Remaining life assessment of Pickering a primary heat transport outlet feeder elbows}
author = {Lee, W, Schefski, C, Lau, T, and Floyd, P}
abstractNote = {Flow Accelerated Corrosion (FAC) has been identified as the main cause of wall thinning in outlet feeder elbows. The calculated thinning rates were based on nominal initial wall thickness and measured wall thickness values. A linear wall thinning rate was assumed due to the limited amount of available data, resulting in very high thinning rates in some cases compared to similar units (Pickering B). There are unit to unit differences in the wall thinning rates and hence a variation in the number of outlet elbows with less than 10 years remaining life. An alternative method, the CANDU Primary Side FAC Rate Model, was used to assure that the remaining life calculations are realistic and conservative. The predicted rates agree well with calculated rates from plant data for 2-inch feeders but are much lower for 2.5-inch feeders. Analysis of plant data and operation history supported the hypothesis that the wide distribution in thinning rates in units with nominally the same primary heat transport system (HTS) conditions was due to a significant range of initial wall thickness and the application of CAN-DECON. Future inspection data after restart will reduce the error due to the linear assumption for the calculated thinning rate and further clarify the wide distribution in thinning rates in units with nominally the same HTS conditions. (author)}
place = {Canada}
year = {2003}
month = {Jul}
}