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10 CFR 21 + and 10 CFR 21.21 +
Engine Systems Inc. (ESI) began a 10CFR21 … Engine Systems Inc. (ESI) began a 10CFR21 evaluation on 08/12/11 upon receipt of four piston assemblies returned from Perry Nuclear Plant. It was reported that Perry had performed a maintenance activity whereby they replaced four of their piston assemblies with four refurbished pistons provided by ESI. Following installation of the replacement pistons, it was found that large portions of the tin plating were flaking or smearing off.</br>The evaluation was concluded on 10/11/11 and determined the piston tin plating delamination to be a reportable defect as defined by 10CFR21 . The delamination was attributed to residual oil impregnated in the ductile cast iron base material of the skirts. The piston assemblies had previously been in service on the emergency diesel generators and were later refurbished by ESI in 2007. A portion of the refurbishment activity consisted of re-tin plating the piston skirts.</br>ESI is not aware of any absolute methods for ensuring all oils have been removed (or at least to the point that it will not interfere with tin plating adhesion). As a result of this finding, it is ESI's recommendation that piston skirts which have been in service should no longer be re-tin plated.</br>ESI Internal Report Number: 10CFR21-0103, Rev. 0</br>Potentially affected power plants: Perry, River Bend, Comanche Peak, and Catawbary, River Bend, Comanche Peak, and Catawba +
04:00:00, 11 October 2011 +
47,347 +
17:19:00, 17 October 2011 +
04:00:00, 11 October 2011 +
Engine Systems Inc. (ESI) began a 10CFR21 … Engine Systems Inc. (ESI) began a 10CFR21 evaluation on 08/12/11 upon receipt of four piston assemblies returned from Perry Nuclear Plant. It was reported that Perry had performed a maintenance activity whereby they replaced four of their piston assemblies with four refurbished pistons provided by ESI. Following installation of the replacement pistons, it was found that large portions of the tin plating were flaking or smearing off.</br>The evaluation was concluded on 10/11/11 and determined the piston tin plating delamination to be a reportable defect as defined by 10CFR21 . The delamination was attributed to residual oil impregnated in the ductile cast iron base material of the skirts. The piston assemblies had previously been in service on the emergency diesel generators and were later refurbished by ESI in 2007. A portion of the refurbishment activity consisted of re-tin plating the piston skirts.</br>ESI is not aware of any absolute methods for ensuring all oils have been removed (or at least to the point that it will not interfere with tin plating adhesion). As a result of this finding, it is ESI's recommendation that piston skirts which have been in service should no longer be re-tin plated.</br>ESI Internal Report Number: 10CFR21-0103, Rev. 0</br>Potentially affected power plants: Perry, River Bend, Comanche Peak, and Catawbary, River Bend, Comanche Peak, and Catawba +
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00:00:00, 17 October 2011 +
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22:26:44, 24 September 2017 +
17:19:00, 17 October 2011 +
6.555 d (157.32 hours, 0.936 weeks, 0.215 months) +
04:00:00, 11 October 2011 +
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