The fall outage at the South Texas Project (STP) electric generating station includes several first-time projects, among them replacement of the reactor vessel head.rnSTP's ambitious replacement reactor vessel head (RVH) project has been in development since 2005, when contract negotiations began. The RVHs are being replaced because the current head adapters are made of Alloy 600, which is subject to primary water stress corrosion cracking. The new head adapters will be Alloy 690.
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