ML20002D562

Interim Deficiency Rept Re Electrical Component Cabinets Where Frame Is Welded to Embedded Steel Angles,Initially Reported 810109.Concrete Failure & Loss of Positive Anchorage Possible.Review Will Be Completed by 810306

ML20002D562
Person / Time
Site:	Three Mile Island
Issue date:	01/13/1981
From:	Barker N GILBERT/COMMONWEALTH, INC. (FORMERLY GILBERT ASSOCIAT
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 8101210353
Download: ML20002D562 (3)

Text

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, o b-Gilbert / Commonwealth engineers and consuttants GILBERT ASSOCIATES. INC., P. O. Box 1498, Reading, PA 19603/Tel. 215-775-2600/ Cable Gitasoc/ Telex 836431 January 13, 1981 United States Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406 ATTENTION: Mr. Boyce H. Grier Director

SUBJECT:

Potential Reportable Event -

Electrical Cabinet Anchorage

Dear Mr. Grier:

This documents the reporting of a potential significant deficiency to P

. Dilanni, Duty Officer, by telephone call on January 9,1981, at apjcoximately 5:07 p.m.

Name of Individual Who Reported Norman R. Barker, Gilbert Associates Quality Assurance Division General Manager, at the above address , made the call.

Activity Involved Gilbert Associates, Inc. (GAI) design of electrical component cabinet anchorage.

Components Involved See attached list.

Facility Involved Three Mile Island Nuclear Station, Unit 1, operated by the Metropolitan Edison Company.

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US Nuclear Regulatory Commission Jan. 13, 1981 Mr. B. H. Grier N. R.. Barker Page 2 Nature of Defect This potential reportable event is related to those electrical component cabinets (see attached list) where the cabinet frame is welded to embedded steel angles. During a seismic event, uplift forces on the angle will be transmitted to concrete anchors (anchoring the angle), possibly overstressing the concrete, causing concrete failure and loss of positive anchorage.

The safety hazard which could be created, is possible loss of equipment function, due to excessive movement or rocking of equipment during a seismic event.

Date Information Obtained A written report indicating this to be potentially reportable, was received by the Quality Assurance Division on January 9,1981.

Corrective Action An engineering review will be performed to determine whether a safety hazard was created, and whether the potential deficiency exists on any other GAI-designed plants. This investigation will be completed by March 6, 1981.

If you require any further action on this matter, please contact me at (215) 775-2600, extension 2285.

Very truly yours, N. R. BARKER General Manager Quality Assurance Division At tachment i cc: 11. Lorenz T. M. Demers V.<Stello,' Director, 0ffice=of-Inspection & Enforcement. 3 copies

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Nuclear' Regulatory-l Commission, . Washington,- D. C. " 20555 RCll:NRB:lsa

ATTACHMENT / _.

s The following is a list of Safety-Related equipment having the aforementioned anchorage detail.

Item Description . Location Drawing 1 Actuation "A" Cabinet Control Building, El. 338'-6" E-421-228 Sect. 24-24 2 Actuation "B" Cabinet Control Building, El. 338'-6" ~ E-421-228 Sect. 24-24' 3 Eng. SFCD Relay Cabinets (3) Control Building, El. 338'-6" E-421-228 Sect. 24-24

• 4 Control Rod Drive Power Cabinet Control Building, El. 338'-6" E-421-228 Sect. 24-24

• 5 Logic Cabinet & Control Rod Drive Control Building, El. 338'-6" E-421-228 Sect. 24-24 Control Cabinet 6 Relay Cabinet XCL Control Building, El. 338'-6" E-421-228 Sect. ~24-24 7 Relay Cabinet XPL Control Building, El. 338'-6" E-421-228 Sect. 24 8 Relay Cabinet XCE Control Building, El. 338'-6" E-421-228 Sect. 2'-?&-

• 9 Relay Cabinet Diode DPL Control Building, El 338'-6" E-921-228 Sect. 24-24 10 Relay Cabinet XCC Control Building, El. 338'-6" E-421-228 Sect. 24 11 Relay Cabinet XPCR Control Building, El. 338'-6" E-421-228 Sect. 24-24 12 Transfer Sw. for IC VLVS MCC Control Building, El. 322' E-421-228 Sect. 24 13 DC Pn L "Im" Control _ Building, El. 322' E-421-228 Sect. 24-24 14 RC Pump PWR Monitor Rack A & B Control Building, El. 322' E-421-228 Sect. 24-24 15 AC Dist. Panels (2) Control Building, El. 322' E-421-228 Sect. 24-24

• Not required for Safe Shutdown