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Measurement Of Residual Stresses In Alloy 600 Pressurizer Penetrations

From Lambda Technologies
 

 

Alloy 600 penetrations in several pressurized water
reactors have experienced primary water stress
corrosion cracking near the partial penetration
J-welds between the Alloy 600 and the cladding on
the inside diameter of the components. The
microstructure and tensile properties indicated that
the Alloy 600 was susceptible to primary water stress
corrosion cracking (PWSCC) providing that a high
tensile stress (applied + residual) was present.
The residual stress distributions at the inside diameter
surface and at different depths below the surface were
measured in Alloy 600 nozzle and heater sleeve
mockups. Surface residual stresses on the nozzle
mockup ranged from -350 to +830 MPa. For the
heater sleeve mockup, the surface residual stresses
ranged from -330 to +525 MPa. In the areas of high
tensile residual stress, for the most part, the residual
stresses decreased with increasing depth below the
surface. For the nozzle and heater sleeve mockups,
the percent cold work and yield strength as a function
of depth were determined.

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