- - _ _ _ _ -.

Ii

TENNESSEE VALLEY AUTHORITY..

'

CH ATTANOOGA. TENNESSEE 37401

6N 38A Lookout Place

SEP 201989

Director, Office of Nuclear Reactor RegulationU.S. Nuclear Regulatory CommissionA1TN: Document Control Desk i

!Washington, D.C. 20555

Gentlemen: ]

In the Matter of ) Docket Nos. 50-259Tennessee Valley Authority ) 50-260

50-296

BROWNS FERRY NUCLEAR PLANT (BFN) UNIT 2 - DOCKET NO. 50-260 - FACILITYOPERATING LICENSE DPR-77 - 10 CFR 21 REPORT ON AIR CONDITIONING UNITS

On September 15, 1989, O. D. Kingsley, Jr., Senior Vice President, NuclearPower, was informed of a defect with two air-conditioning units provided byEllis & Hatts (E&W) that was determined reportable in accordance with10 CFR 21. M. J. Ray of TVA notified D. A. Moran of the NRC Office of NuclearReactor Regulation by telephone that same day. This letter serves as the fiveday report required by 10 CFR 21.21(b)(2).

The defect was identified as a result of an audit of the E&H quality assurancepractices and subsequent field investigations that led to an evaluation of adeviation from a TVA procurement contract. The TVA contract required the twoE&W air-conditioning units, the basic components, to be environmentally

.

qualified to IEEE 323-1974 and to satisfy other Class IE quality requirements

|including ANSI N45.2 and ICEA S-66-524. A TVA Condition Adverse to QualityReport initiated in July 1989 described the use of undocumented electrical|

I components and cabling in these air-conditioning units and inadequate| environmental qualification documents.i

These redundant air-conditioning units, each consisting of an air-handlingunit (Model AEH-275) and a compressor unit (Model LC-39), are installed abovethe D 4160V shutdown board room on the 593 foot elevation of BFN unit 2.This area of the plant could be subject to a harsh environment during certaindesign basis accidents. These air-conditioning units provide area cooling forthe C and D 4U 'V shutdown board rooms which contain essential electricalequipment. There is no assurance that these redundant air-conditioning unitscould survive the postulated harsh environment resulting from a design basisaccident and maintain the proper temperature of these shutdown board roomswithout adequate environmental qualification for the electrical components andcabling. In turn, the essential electrical equipment contained in theshutdown board rooms and the safety-related equipment powered by thiselectrical equipment can not be assured to complete their intended safetyfunction with the loss of the redundant air-conditioning units.

Me90928o10e 890920DR ADOCK 0500 o

An Equal opportunity Employer

.- _ _ --_ _ _ _______. ______ - ___ -

--- .

. .

.

-2-.

.

U.S. Nuclear Regulator Commission

SEP 201989Based on the engineering evaluations of the functional capability of theunits, it was determined that the deviation could create a substantial safety

.

'

hazard and is a defect reportable in accordance with 10 CFR 21.

Although a 10 CFR 21 deportability determination has been made, there is noimmediata safety concern with these air-conditioning units installed at BFN.Unit 2 is currently in cold shutdown and has been since the installation ofthe air-conditioning onits was ir.itiated in January of 1988. There is noaccident condition that could cause a temperature-induced harsh environment inthe two shutdown board rooms with unit 2 in cold shutdown. TVA is currentlyreviewing various corrective actions including possible replacement of theaffected electrical components and cabling, or possible relocation of thesecomponents and cabling te locations that would not be subject to a harshenvironment resulting from certain design basis accidents.

Ellis & Watts has been granted procurement w itacts in the past, and iscurrently under contract to provide other ufety-related components, includingspare parts, to BFN, Sequoyah, and Watts sar. TVA is assessing the extent towhich other safety-related components previously provided to TVA nuclearfacilities by E&W could be similarly affected. Additionally, TVA will useadditional procurement receipt inspections of safety-related material receivedfrom E&W in the future and source inspections of safety-related material thatwill be fabricated by E&W to ensure compliance with the procurement contracts.

TVA will provide NRC with a status report of the corrective actions identifiedin the enclosure within 90 days of the date of this letter. If there are any

questions regarding this matter, please contact Mr. Patrick P. Carter at (205)729-3570.

Very truly yours,

TENNESSEE VALLEY AUTHORITY

872.f MMark O. MedfordVice President and Nuclear

Technical Director

Enclosurecc: See page 3

- - - - - - - - - _ - - - _ - - - - _ _ _ _ - _ _ _)

- _ _ _ - _ _ _ _. .

4 ..

v..

-3-.. . .

.

U.S. Nuclear Regulatory Cornission

SEP 201989,

!-'

cc (Enclosure):| Ms. S. C. Black, Assistant DirectorI for Projects

TVA Projects DivisionU.S. Nuclear Regulatory CommissionOne White Flint, North11555 Rockville PikeRockville, Maryland '20852

Mr. B. A.-Wilson, Assistant Directorfor Inspection Programs

TVA Projects DivisionU.S. Nuclear Regulatory CommissionRegion II -

101 Marietta Street, NW, Suite 2900Atlanta, Georgia 30323

D. A. MoranTVA Projects. DivisionU.S. Nuclear Regulatory CommissionOne White Flint, North11555 Rockville PikeRockville, Maryland 20852

NRC Resident InspectorBrowns Ferry Nuclear PlantRoute 12, Box 637Athens, Alabama 35609-2000

-_____- _- -____--_____- - _

- _ _ - _ _ - - _ . -_ __-

. . . .

:

ENCLOSURE'''

.

LIST OF COMMITMENTS,

TVA is currently reviewing various corrective actions including|' 1.

possible replacement of.the nonqualified electrical components and|' cabling, or possible relocation of these components and cabling to

locations that would not be subject to a harsh environment resultingfrom certain design basis accidents.

TVA is assessing the extent to which other safety-related components2.previously provided to TVA nuclear facilities could be similarlyaffected.

TVA will use additional procurement receipt inspections of3.safety-related material received from E&W in the future and Sourceinspections of safety-related material that will be fabricated by E&Wto ensure compliance with the procurement contracts.

TVA will provide NRC with a status report of the corrective actions4. taken in this matter within 90 days of the date of this letter.

__ _-_-______________________ _ ___ _ __ _ _ -_____ _ _ __ _ _ _ -