ML17272A933

Deficiency Rept Re Small Bore Piping Design.Piping & Support Drawings Have Been Released for Fabrication of Incomplete & Unchecked Design Calculations.Independent Engineering Firm Will Complete Remaining Designs

ML17272A933
Person / Time
Site:	Columbia
Issue date:	04/21/1980
From:	WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:
Shared Package
ML17272A932	List: ML17272A930 ML17272A933
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8004280469
Download: ML17272A933 (1)

Text

WPPSS NUCLEAR PROJECT NO. 2 REPORTABLE DEFICIENCY AND CORRECTIVE ACTION FOR DESIGN OF SMALL DIAMETER (2" and under) PIPE WASHINGTON PUBLIC POWER SUPPLY SYSTEM DOCKET NO. 50-397 "LICENSE NO.

CPPR-93'ESCRIPTION OF DEFICIENCY The design control of small diameter piping systems and supports have not been in compliance with ANSIH45.2, for those systems designed by the Mechanical Installation Contractor (C-215). -Piping and support drawings have been released for fabrication with incomplete and unchecked design calculations and, physical field design changes have been made without approval of the responsible design group. As a result, guality Class 1 small diameter piping systems have been installed which'are not in compliance with the established design criteria.

SAFETY SIGNIFICANCE As a i esult of recently implemented design review of installed systems, deviations from specified design criteria have been identified which require rerouting of-pipe and the modification or addition of supports for small diameter systems to assure compliance with spec'ified criteria.

If not corrected, the pipe or hanger components may be subjected to, stress/load condi tions i n excess of allowable limits and fail, resulting in the loss of safety related system components.

CORRECTIVE ACTION An independent engineering firm, Gilbert/Commonwealth Associates, has been contracted to finish the design of the remaining small diameter systems and to perform 'the design verifications of all the as-built small diameter piping systems and the, associated supports which were assigned to Contract 215, except for CRD and nitrogen charging systems which were subcontracted to General Electric. The 215 Contractor will retain the responsibility for the installation and preparation of the as-built drawings. Gilbert/Commonwealth Associates is also furnishing field engineering personnel to assure that design control is maintained by their organization for necessary field changes required during construction. Gilbert/Commonwealth Associates will be on site performing the above functions by May 19, 1980.

Based on the verification results, design changes will be issued for the construction as necessary and the verification process implemented to confirm the as-built configuration satisfies design criteria. Final verified design packages will be certified and P.E. stamped by Gilbert/

Commonwealth Associates as being in conformance with the A/E prepared design criteria document.