ML20151E710

Provides Results of Licensee Program to Resolve Cable Installation Issues Identified in Section III.13.1 of Plant Nuclear Performance Plan & Identify Corrective Actions Required for Each Plant Unit

ML20151E710
Person / Time
Site:	Browns Ferry
Issue date:	07/18/1988
From:	Gridley R TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
Shared Package
ML20151E713	List: ML20151E710 ML20151E723
References
TAC-62260, TAC-R00421, TAC-R421, NUDOCS 8807260180
Download: ML20151E710 (3)

Text

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e TENNESSdE VALLEY AUTHORITY , ,

CHATT ANOOGA. TENNESSEE 37401 3 SN 1578 Lookout Place  ;

UUL 181988 U.S.NuclearRegulatohyCommission ATTN: Document Control Oesk ' )

Washington, D.C. 20555 Gentles:en: ,

t In the Matter of ) Docket Nos. 50-259' Tennessee Valley Authority )

BROWNS FERRY NUCLEAR PLANT (BFN) - RESOLUTION OF CABLE INSTALLATION ISSUES This letter is to provide the results of TVA's program to resolve the cable installation issues identified in section III.13.1 of the BFN Nuclear Performance Plan and to identify the corrective actions required for each of the BFN, units. The scope of the evaluation program at BFN was specifically.

established to ensure consistency with the recently completed and accepted Sequoyah Nuclear Plant (SQN) program and the NRC's Technical Evaluation Report .

(TER) on which the SQN program was based.

TVA performed an extensive and comprehensive review to evaluate the extent to which the cable installation issues applied to BFN. The evaluations, conclusions and recommendations from this review are r,ontained in the summary report (enclosure 1). This report demonstrates the adequacy and integrity of the electrical cables installed at BFN. Implementation of the report's recommendations, as indicated below, as well as the recently upgraded additicmal installation requirements per section 14, item 8 of the SQN TER, will ensure that this integrity is maintained.

The recommendations contained in the summary report are being implemented in the manner and to the schedule specified below:

(1) TVA General Construction Specificatic>n G-38 has been revised to '

incorporate the following (this'is in addition to those epgrades ,

incorporated per the SQN TER):

(a) Direction has been provided to prohibit the use of previously ,

installed pull wires or cables as pull lines. Any pullbys performed ,

will utilize newly installed non-abrasive pull lines.

(b) Methods have been established to limit the length of pullby cable  !'

allowed.

(c) Requirements have been implemented to ensure that a high quality, flowable pull lubricant such as "Polywater J" will be'utilind for j any pullbys, J)Df ,

7260.100 999739 ,

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p ADOCK 05000259 / 5 PNU fg ,

An Equal Opportunity Employer f

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U.S.' Nuclear Regulatory Commission GUL 181988 (2) Conduit containing medium voltage Class 1E cable will be walked down to verify that vertical sections of cable are properly supported and cable

, bend radil is in accordance with the current TVA General Construction Specification G-38 acceptance criteria. For the issue of vertical cable supports, the evaluation methodology, review of nonconforming conditions and the determination of the need for supports will be in accordance with referenco 5 of the SQN TER, which has been previously discussed with NRC.

Vertical sections of cable not properly supported will be high voltage dc (HVDC) tested at the maintenance voltage levels specified in IEEE Standard 400 and supports added if the cable passes the test. The support methods will be in accordance with those previously agreed upon between TVA and NRC for SQN. For the issue of cable bend radii, any cables which do not meet the G-38 criteria will be technically justified or replaced to ensure compliance with G-38 requirements. The above actions,will be completed on those cables required for unit 2 operation before restart of unit 2. These actions on the remaining cables will be completed before restart of their respective unit.

(3) Conduits containing Class 1E low voltage power and control circuits will '

be walked down to identify vertical cable support situations with cable deformations or substantial strain on cables in a condulet or similar fitting. Utilizing the criteria established at SQN, those cables that are exposed to a significant strain will be resupported. Before resupporting, these cables will be insulation resistance tested in accordance with IEEE Standard 690. Those cables that cannot easily be lifted off the condulet corners by hand or are found to be severely indented will be considered to be under significant strain. The support methods will also be in '

4 accordance with those previously agreed upon between TVA and NRC for SQN.

As justified in the summary report, the above actions will be scheduled to be completed on the cables associated with each unit within approximately two years of restart of the respective Unit.

Based on the enclosed summary report and implementation of the above, TVA will have resolved the cable installation issues at BFN.

Summary statements of commitments contained in this submittal are provided in enclosure 2.

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f U.S. Nuclear ~ Regulatory Commission 3 'Jbb b l008 Please refer any questions regarding this submittal to M. J. May, Manager, BFN Site' Licensing (205)-729-3570.

t Very truly yours,

' TENNESSEE VALLEY AUTHORITY  :

b.Gridley, Director.

Nuclear Licensing and Regulatory Affairs Enclosures cc (Enclosures):

Ms. S. C. Black, Assistant Director for Projects TVA Projects Division U.S. Nuclear Regulatory Commisslor.

One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Mr. F. R. McCoy, Assistant Director for Inspection Programs ,

TVA Projects Division U.S. Nuclear Regulatory Commission '

Ibgion II 101 Marietta Street, NH, Suite 2900 Atlanta, Georgia 30323 Browns Ferry Resident Inspector Browns Ferry Nuclear Plant Route 12, Box 637 Athens, Alabama 35611 i

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