ML20010C691

Part 21 Rept Re Potential Defect on Cable Tray Supports. Applicable Strut Fitting Configurations Based on Incorrect Load Tables Will Be Identified.Applicable Allowable Loads Will Be Determined.Completion Expected by 811115

ML20010C691
Person / Time
Site:	Seabrook, Washington Public Power Supply System
Issue date:	08/07/1981
From:	Sarsten G UNITED ENGINEERS & CONSTRUCTORS, INC.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
REF-PT21-81-484-000 PT21, PT21-81-484, PT21-81-484-000, NUDOCS 8108200317
Download: ML20010C691 (3)

Text

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30 South 17th Street c tLow Post Office Box 8223 xwoxvitte Philadelphia, PA 19101 PHILADELPHlA VALLEv FORGE August 7, 1981 Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Subject:

10CFR21 Report of a Potential Defect related to Public Service Company of New Hampshire - Scabrook Station and Washington Public Power Supply System - WNP 1 and 4 This report describes a condition found during a routine engineering test program being performed on cable tray supports. The test results indicate that:

a. Ioad capabilities, provided in strut vendor catalogues cannot be confirmed by tests by the vendor and lead to wrong conclusions.

b. UE&C criteria based on vendors published catalogue data do not provide acceptable margin.

, Applicable details as required by 10CFR21, paragraph 21.21(b)(3) are con-tained in the attached report. This condition has been reported by Public Service Company of New Hampshire under the provisions of 10CFR50.55(e) and will be reported by Washington Public Power Supply System.

Very truly yours, s /

' G. E Aarsten Vice President - Power Attachment l

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

G. E. Sarsten, Vice President - Power United Engineers & Constructors Inc.

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

Seabrook Station of Public Service Company of New Hampshire Nuclear Project Nos.1 & 4 - Washington Public Power Supply System The design of cable tray and conduit supports (struts) 4 based on the loed carrying capabilities published in manuticturers design catalu pes for struts, which cannot be supporte? by test results.

IDENTII'ICATION OF THE FIRM CONSTRUCTING TIE FACILITY OR SUPPLYING THE BASIC CF.4P0NENT WHICH FAILS TO COMPLY OR CONTAINS A DEFECT.

i United Engineers & Constructors Inc., architect, engineer, and construction manager.

Super Strut Inc., Metal Framing Division, Midland Ross Corp.,

Oakland, California, manufacturers of " Super Strut" Power Strut Division, Van Huffel Tube Corp. , Warren, Ohio, manufacturers of " Power Strut" NATURE OF THE DEFECT OR FAILURE TO COMPLY ...D THE SAFETY HAZARD WHICH IS CREATED OR COULD BE CREATED BY SUCH DEFE ;f LR FAILURE TO COMPLY.

The strut support system used for the cable tray and conduit supports could be subject to slippage at the bolted strut fittings at the published allowable loads when multiple bolt fastening methods are used.

The defect, if lef t uncorrected, could cause a failure of the cable tray and conduit supports to properly retain safety-related electrical cables during seismic events.

THE DATE ON WHICH THE INEURMATION OF SUCh DEFECT OR FAILURE TO COMPLY WAS OBTAINED, August 7, 1981.

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O IN THE CASE OF A BASIC 00MPONENT 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 -

REGULATION IN THIS PART.

This defect applies to some cable tray and conduit supports for safety-related cables in the Seabrook Station and Washington Nuclear Project Nos. 1 and 4.

THr, CORRECTIVE ACTION WHICH HAS BEEN, IS BEING, OR WILL BE TAKEN:

THE NAME OF THE INDIVIDUAL OR ORGANIZATION RESPONSIBLE EUR THE ACTION: AND THE LENGTH OF TIME THAT HAS BEEN OR WILL BE TAKEN TO COMPLETE THE ACTION.

Corrective Action

1. Identify all applicable strut fitting configurations which are based on incorrect load tables.

2. Determine appropriate applicable allowable loads for the con-figurations identified.

3. Develop acceptance criteria and appropriate design modifications for the defective configurations.

Name of the Organization Responsible for Cor ective Action Power Division of United Engineers & Constructors Inc.

Length of Time That Will Be Taken to Complete the Action By November 15, 1981 ANY ADVICE RELATED TO THE . DEFECT OR FAILURE IJ COMPLY ABOUT THE FACILITY, ACTIVITY, OR 3ASIC COMPONENT THAT HAS BEEN, IS BEING, OR WILL BE GIVEN TO PURCHASERS OR LICENSEES.

Public Service Company of New Hampshire informed Region I on July 27, 1981 according to the provisions of 10CFR59.55(e).

Washington Public Power Supply System was advised by G. E.

Sarsten on August 7, 1981.

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