ML20003F538

Interim Deficiency Rept Re Insufficient Seismic Bracing & Qualification Calculations for Electrical Cable Tray Hangers,Initially Reported 810320.Revised Design Procedures Have Been Implemented

ML20003F538
Person / Time
Site:	Mcguire
Issue date:	04/16/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, SD-370-81-01, NUDOCS 8104220418
Download: ML20003F538 (2)

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DUKE POWER COMPANY I Powen Britmixo i 422 SocTu C.u:acu Sruxer. CnAru.oTTr. N. C. 28242 ww4w e. =4anca. sa.

/.cr Pots.org, *g,g e.3 g; ra c. 74 s .t. =. coco. April 16, 1981 3 >.:33 i

N Mr. James P. O'Reilly, Director , g 8' i i g U.S. Nuclear Regulatory Commission T '- e q Region II h g" )

101 Marietta Street, Suite 3100 -

VI FLU Atlanta, Georgia 30303 ]y pf,q g 'y I

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Re: McGuire Nuclear Station - ' N <)

Units 1 and 2 Docket No. 50-370

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Dear Mr. O'Reilly:

Pursuant to 10CFR 50.55e please find attached-Significant Deficiency Report SD 370/81-01.

- r, Ver truly yours, '

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~liam O. Parker, Jr.

RWO:pw Attachment ,

cc/ Director T. J. Donat Office of Inspection and Enforcement NRC Resident Inspector U.S. Nuclear Regulatory Commission McGuire Nuclear Station Washington, D.C. 20555 b/7 5

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810422 "

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MCGUIRE NUCLEAR STATION i REPORT NO: SD-370/81-01 REPORT DATE: April 2, 1981 FACILITY: McGuire Nuclear Station - Unit 2 IDENTIFICATION OF DEFICIENCY: Electrical Cable Tray Hangers Insufficient Seismic Bracing and Qualification Calculations INITIAL REPORT:

On March 20, 1981, Mr. Art Johnson of NRC Region II, Atlanta, Georgia was . noti-fied of this deficiency by Mr. J. R. Wells and Mr. D. G. Owen of Duke Power Company, Charlotte, NC 28242.

1 SUPPLIER AND/OR COMPONENT:

The cable tray hangers were constructed with Unistrut Type P1001 cor.ponents.

Required bracing will be of the same type material.

DESCRIPTION OF DEFICIENCY:

During the normal handling of Variation Notice No. 22286 as written on a Reactor Building Cable Tray Hanger, it was discovered that no seismic bracing existed for the hanger. Subsequent review of all seismic qualification documentation for safety-related electrical cable tray hangers determined that no seismic bracing Unit 2.

or calculations existed for 12 Reactor Building hanger standards for ANALYSIS OF SAFETY IMPLICATION: .

The deficiency is that affected cable tray hangers in the Unit 2 Reactor Building do not have seismic bracing or calculations to demonstrate their adequacy to withstand a seismic event. Lack of seismic bracing on the affected hangers could have resulted in damage to cafety circuits in the affected trays during 2 seismic event.

-Commitment has been made to install all required seismic bracing as veri-ficd by calculations.

Since this deficiency was determined before operation, the health and safety of the public were not affected.

CORRECTIVE ACTION:

Seismic calculations for all affected cable tray hangers has been performed and all required bracing will be added to the Unit 2 affected hangers on or before November 1, 1981. Verification has been made to determine that all Reactor Building hangers requiring seismic qualification have been analyzed and all seismic bracing has been designed where required. Revised design procedures have been implemented to assure no reoccurrence of a similar deficiency.

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