TECHNICAL POSITION ON PIPING SYSTEM INSTALLATION TOLERANCES ; TECHNICAL POSITION ON DAMPING VALUES FOR INSULATED PIPE – SUMMARY REPORT (To Purchase Call 1-800-854-7179 USA/Canada or 303-397-7956 Worldwide)
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.