scope:

The Technical Position provides tolerances on the as-built geometry of Light Water Reactor piping and pipe support locations that are considered acceptable for reconciliation with as-designed geometry. That is, a piping system geometry that is in compliance with the plant licensing commitments based on the as-designed documentation is also considered to be in compliance if the reported as-built critical to design dimensions do not exceed the total tolerances presented in the Technical Position. Currently, most nuclear power plant construction activities involve a significant amount of time and dollars related to reconciling the as-built piping and support locations with the as-designed configuration. This occurs because it is impractical, if not impossible, to fabricate and install piping and pipe supports to the exact dimensions given on the design drawings. However, the design documentation, including analyses,must rely on the as-designed geometry since it is necessary to determine initial design acceptability prior to release for construction. In the end any significant differences must be reconciled.