ML20151Y822
| ML20151Y822 | |
| Person / Time | |
|---|---|
| Site: | Seabrook, 05000000, Washington Public Power Supply System |
| Issue date: | 02/06/1986 |
| From: | Kreider H UNITED ENGINEERS & CONSTRUCTORS, INC. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| REF-PT21-86, REF-PT21-86-051-000 PT21-86-051-000, PT21-86-51, NUDOCS 8602130175 | |
| Download: ML20151Y822 (3) | |
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Uruled Engineers & Constructors Inc.
215 433 3000 30 South 17th Street Telen 83 4203 Post Omc3 Box 8223 Telecopier 215 422 4648 Philadelphia, PA 19101 United Engineers
& Constructors A Raynemen Compyy February 6, 1986 Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, DC, 20555
Dear Sir:
10CFR21 Report of a Defect Related n' Public Service Company of New Hampshire Seabrook Station - Units 1 & 2 Re: Letter to Director, Office of Inspection and En-forcement dated January 3,
1986 from United En-gineers & Constructors Inc.
This is our final report concerning the corrective actions taken for a de-feet related to an error in a Computer Program used in the analysis of component supports for the Seabrook Nuclear Generating Station and Wash-ington Public Power Supply System Project No.1.
Details of our final report are attached.
Very truly yours,
. Kreider, J.
Vice President LSN:mck Attachment cc: Regional Director USNRC - Region 1
e NAME' AND ADDRESS OF.THE INDIVIDUAL OR INDIVIDUALS' INFORMING THE COMMISSION.
- H. G. Kreider, Jr., Vice President United Engineers & Constructors Inc.
'30 South 17th Street Philadelphia, Pa. 19101-IDENTIFICATION OF THE FACILITY, THE' ACTIVITY, OR lTHE BASIC COMPONENT SUPPLIED
~ FOR SUCH FACILITY < 0R SUCH ACTIVITY WITHIN THE UNITED STATES WHICH FAILS TO COMPLY OR CONTAINS A DEFECT.-
Public Service Company of New Hampshire, Seabrook Station.
Computer analysis and design of component supports.
IDENTIFICATION OF THE FIRM CONSTRUCTING THE FACILITY OR SUPPLYING THE BASIC COMPONENT WHICH FAILS TO COMPLY OR CONTAINS A DEFECT.
United Engineers & Constructors Inc.
NATU'RE 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 ana' lysis check-~on a previously. completed Duct Sup-port with the GT STRUDL' Program, which is marketed by Control Data Corporation and supported by Georgia Institute of Technology, an error was' ' discovered in the section of the program that calculates frequencies using the Raleigh Quotient Method.
THE DATE ON WHICH THE INFORMATION OF SUCH DEFECT OR FAILURE TO COMPLY WAS OBTAINED.
August 7, 1985 IN THE 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 REGULA-TIONS IN THIS PART.
This defect applies to the Seabrook Station, Units 1 and 2 and Washington Public Power. Supply System Nuclear Project No.1.
~
e
't 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 Raleigh 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 Design Guidelines have been revised to require that all such runs be voided and converted to another verified computer program.
For the Seabrook Project, it has been determined that numerous compon-ent supports were analyzed using the GT STRUDL program versions having the reported error.
A systematic review of the analyses of e
these components supports have been completed.
Initially, a sample of 25 computer runs potentially affected by the GT STRUDL program error were reviewed. The result of this review in-dicated that none of the 25 support designs were impacted by the error. Subsequently, a generic evaluation of this problem for all other potentially affected HVAC support designs was performed.
The result of this generic evaluation also indicated that none of the potentially affected HVAC support designs were impacted by the com-puter program error.
All pipe and I&C support designs potentially affected were reviewed and found to be unaffected by the computer program error. The GT-STRUDL routine which calculates frequencies by the Raleigh method has not been used in the design of electrical sup-ports or structures.
In reference to the potential impact on the work performed by equip-ment vendors, we have contacted all vendors of safety related equip-ment for the Seabrook and Supply System projects. We have determined, on the basis of the responses received and of our own detailed evalua-tion, that none of the vendors used the subj ect computer program for equipment design.
ANY ADVICE RELATED TO THE DEFECT OR FAILURE TO COMPLY ABOUT THE FACILITY, ACTIVITY, OR BASIC COMPONENT THAT HAS BEEN, IS BEING, OR WILL BE GIVEN TO PURCHASERS OR LICENSEES.
Not required.
.