ML20141F611

Interim Part 21 Rept Re Error in Computer Program Used in Analysis of Component Supports.Nuclear Pipe Support Design Guidelines Revised to Require Conversion to Another Computer Program.Final Rept by 860307

ML20141F611
Person / Time
Site:	Columbia, Seabrook, 05000000
Issue date:	01/03/1986
From:	Kreider H UNITED ENGINEERS & CONSTRUCTORS, INC.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
REF-PT21-86, REF-PT21-86-005-000 PT21-86-005-000, PT21-86-5, NUDOCS 8601090464
Download: ML20141F611 (3)

Text

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Unded Ergneers & Constructors Inc. 215 422 3000

, , 30. South 17th Street Tex 83 4203 Post Othc] Box 8223 Telecopier 215 422 4648 j Phdadelphia, PA 19101 i

econstructors A Roy00sesse Conrany January 3, 1986 Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, DC 20555 Dear Sirs 10CFR21 Report of a Defect Related to Public Service Company of New Hamsphire Seabrook Station - Units 1 & 2 Re Letter to Director, Office of Inspection and Enforcement Dated October 11, 1985 from United Engineers & Constructors Inc.

This is to inform you of the status of the corrective actions taken for a defect related to an error in a Computer Program used in the analysis of component supports for the Seabrook Nuclear Generating Station and Washington Public Power Supply System Project No. 1. We are providing this 10CFR21 interim report to assure that the Commission has been adequately informed.

A final report will be issued on March 7, 1986, covering the corrective actions for the design defect related to the usage of an erroneous Computer Program in the analysis of components supports and reported to you in the referenced letter.

Details of our report are attached.

Very truly ours, i E00

. . G. Kreider, Jr.

Vice President - Power LSN/kx Attachment cc: Regional Director USNRC - Region 1

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NAME AND ADDRESS OF THE INDIVIDUAL OR INDIVIDUALS INFORMING THE COMMISSION.

i H. C. Kreider, Jr., Vice President United Engineers & t'onstructors Inc.

30 South 17th Street Philadelphia, PA 19101 IDENTIFICATION OF THE FACILITY, THE ACTIVITY, OR THE BASIC COMPONENT SUPPLIED FOR SUCH FACILITY OR SUCH ACTIVITY WITilIN THE UNITED STATES WHICH FAILS TO COMPLi OR CONTAINS A DEFECT.

Public Service Company of New Hampshire, Seabrook Station. Computer analysis and design of component supports.

IDENTIFICATION OF Tile FIRM CONSTRUCTING THE FACILITY OR SUPPLYING THE BASIC COMPONENT WHICH FAILS TO COMI'LY OR CONTAINS A DEFECT.

United Engineers & Ccnstructors Inc.

NATURE OF THE DEFECT OR FAILURE TO COMPLY AND THE SAFETY HAZARD WHICH IS CREATED OR COULD BE CREATED BY SUCH DEFECT OR FAILURE TO COMPLY.

In performing an analysis check on a previously completed Duct Support with the GT STRUDL Program, which is marketed by Control Data Corporation and supg.orted by Georgia Institute of Technology, an error was discovered in the section of the program that calculates frequencies using the Rayleigh Quotient Method.

Tile DATE ON WHICil THE INFORNATION OF SUCH DEFECT OR FAILURE TO COMPLY WAS OBTAINED.

August 7, 1985

• IN Ti!E CASE OF A BASIC COMPONENT WHICH CONTAINS A DEFECT OR FAILS TO COMPLY, THE NUMBER AND LOCATION OF ALL SUCH COMPONENTS IN USE AT, SUPPLIED FOR, OR BEING SUPPLIED FOR ONE OR MORE FACILITIES OR ACTIVITIES SUBJECT TO THE RE';ULATIONS IN THIS PART.

This defect applies to the Seabrook Station, Units 1 and 2 and Washington Public Power Supply System Nucicar Project No. 1.

. es THE CORRECTIVE ACTION WHICH HAS BEEN, IS BEING, OR WILL BE TAKEN: THE NAME OF THE INDIVIDUAL OR ORGANIZATION RESPONSIBLE FOR THE ACTION: AND THE LENGTH OF TIME THAT HAS BEEN OR WILL BE TAKEN TO COMPLETE THE ACTION.

The evaluation of possible impact on the work performed by UNITED and equipment vendors has been completed.

In reference to the potential impact on our work related to component support design, we have completed detailed evaluation as follows:

For the Supply System Project, it has been determined that only 156 pipe supports were analyzed using the GT STRUDL program versions having the reported error in calculating frequencies by the Rayleigh method. Most of these supports have been re-analyzed using another computer program, as part of a current final verification program.

However, in order to completely preclude the possibility of using old GT STRUDL runs in the design process, the Nuclear Pipe Support l Design Guidelines have been revised to require that all such runs be voided and converted to another verified computer program.

l For the Seabrook Project, it has been determined that numerous l

component supports were analyzed using the GT STRUDL program versions having the reported error. A systematic review of the analyses of these component supports have been completed.

l Initially, a sample of 25 computer runs potentially af fected by the l

GT STRUDL program error were reviewed. The result of this review j indicated that none of the 25 support designs were impacted by the error. Subsequently, a generic evaluation of this problem for all other potentially af fected HVAC support designs was performed. The l result of this generic evaluation also indicated that none of the l potentially affected ilVAC support designs were impacted by the computer program error. All pipe and 16C support designs potentir.11y af fected were reviewed and found to be unaffected by the computer program error. The GT-STRUDL routine which calculates frequencies by the Rayleijh method has not been used in the design of electrical supports or structures.

In re fe rence to the potential impact on the work performed by equipment vendors, we have contacted all vendors of safety related equipment for the Seabrook and Supply System projects. For the Seabrook project, we have determined on the basis of the responses received and of our own detailed evaluation that none of the vendors used the subject computer program for equipment design. For the l

Supply System project, we hope to complete this evaluation before March 7, 1986, when a final report will be issued.

ANY ADVICE RELATED TO THE DEFECT OR FAILURE TO COMPLY ABOUT THE FACILITY, ACTIVITY, OR BASIC COMPONENT HAS BEEN, IS BEING, OR WILL BE CIVEN TO PURCHASERS OR LICENSEES.

Not required.

l l