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PWR Applications

Alloy 600 Locations in PWR Plants

 

 

Various PWR locations where dissimilar metal welds may be present are a susceptible to Primary Water Stress Corrosion Cracking (PWSCC).  The diagram below shows many of the locations and MSIP® has been successfully applied to RV (hot & cold), Pressurizer, Safety Injection, Surge, Drain, Shutdown cooling, and Charging Nozzles.



MSIP® has effectively and permanently mitigated nine different cracks on various PWR piping weldments. Post mitigation inspections have confirmed no further crack growth.

PWR Projects where MSIP® has been performed to permanently mitigate SCC are listed below.

Plant

Year

Nozzles & SEs

Palisades

1995

2 Surge & 1 Shutdown Cooling 

V.C. Summer

2002

2 Hot leg RV Nozzles

Calvert Cliffs 1

2006

3 Pressurizer, 2 Surge (both ends), 2 CL Drain Nozzles

Calvert Cliffs 2

2007

3 Pressurizer, 2 Surge (both ends), 1 CL Drain Nozzles

Salem 1

2008

4 RV Hot Leg and 4 RV Cold Leg

Watts Bar 1

2008

5 pressurizer nozzles and 1 surge nozzle

Salem 2

2009

4 RV Hot Leg Nozzles

Seabrook

2009

1 RV Hot Leg Nozzles (emergent)

DC Cook

2010

4 RV Hot Leg and 4 RV Cold Leg

Shearon Harris

2010

3 RV Hot Leg Nozzles

St. Lucie Unit 1

2010

4 Cold Leg SI nozzles

Watts Bar Unit 2

2010

4 RV Hot Leg Nozzles and 4 RV Cold Leg Nozzles

St. Lucie Unit 2

2011

4 Cold Leg SI Nozzles & 2 Charging Nozzles

Byron Unit 1

2011

4 RV Hot Leg Nozzles and 4 RV Cold Leg Nozzles

Braidwood Unit 1

2012

4 RV Hot Leg Nozzles and 4 RV Cold Leg Nozzles

Braidwood Unit 2

2012

4 RV Hot Leg Nozzles and 4 RV Cold Leg Nozzles

Byron Unit 2

2013

4 RV Hot Leg Nozzles and 4 RV Cold Leg Nozzles

Vogtle Unit 1

2014

4 RV Hot Leg Nozzles

Vogtle Unit 2

2014

4 RV Hot Leg Nozzles

 
     
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