ML20070R592

Forwards Corrective Actions Plan for Disposition Concerns Re Cable Tray Supports.Seismic Qualification for Cable Tray Supports Will Be Verified Prior to Plant Restart

ML20070R592
Person / Time
Site:	Browns Ferry
Issue date:	03/27/1991
From:	Wallace E TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9104010249
Download: ML20070R592 (4)

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MAR 271991 U.S. Nuclear Regulatory Commission ATTN Document Control Desk Washington, D.C. 20555 centlement In the Matter of ) Docket Nos. 50-259

. Tennessee Valley Authority ) 50-260 50-296 BROWFS FERRY NII(" EAR PLANT ',BFN) - ACTIU.V P!.AN TO DISPOSITION CONCERNS RELATED 'r0 Uyr ' AND 3 Ci?! TR... S'TPPfMIS

Reference:

TVA lot'er, dated January 9,1991. Plans for the Return to Service of BFN Units 1 and 3

'As part of the referenced letter, TVA committed to provide the NRC Staff with the actior, ,.lan for dispositioning concerns related to cable tray supports at BFN inits 1 and 3. TVA committed to provide a summary of the concerns, a review of the Unit 2 resolution, a discussion of lossons learned, and a description of how these concerns will be resolved on Units 1 and .1 Th".s information-is provided as Enclosure 1.

This submittal is.provided for informational purposes only. No NRC action is specifically requested. A summary list of commitments

' contained in this letter is provided as Enclosure 2. If you have any questions, please contact Joseph E. McCarthy, Manager of Unit 3

(. Licensing, at #205) 729-3604.

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'Very truly yours, 1

7 "NESSEE VALLEY AUTHORITY

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G. h 11 ace, nager NucleaF Licensing and Regulatory Affairs /

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Enclosures cc: See page 2-1 l'

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+ U.S. Nuclear Re5ulatory. Commission MAR 27 ng; cc (Enclosures) -

Ms._S. C. Black, Doputy Director Project Directorate 11-4 U.S. Nuclear. Regulatory Commission One White Flint, North 11555 Rockville Pike, Rockville.. Maryland- 20852-NRC Resident Inspector Browns Ferry Nuclear Plant Route 12, Box 63T ._

Athens, Alabama 35609-2000 Mr. Thierry'M. Ross, Project Manager

.U.S. Nuclear Regulatory Commission one White Flint, North

-11555 Rockville Pike

-Rocky)11e.. Maryland 20852 Mr.'B. A. Wilson,-Project Chief U.S. Nuclear Re5ulatory Commission JRe51on'II 101 Marietta Street, NW, Suite 2900 Atlanta, Cecrgia 30323 1

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P ENCLOSURE 1 BROWNS FERRY NUCLEAR PLANT - UNITS 1 AND 3 CABLE TRAY SUPPORTS CORRECTIVE ACTION DLAN Concerns were raised regarding the impact of cable tray overfill and t-cessive application of fire retardant material (flamemastic) on the seismic qualification of cable trays. In respon9e to these concerne, TVA devolcped an interim program to evaluate Unit 2 and common cable trays and supporte necessary to support Unit 2 operation and those non-essential supports whose i

failure could effect systems or componente essential to Unit 2 operation. Thc long term evaluation of the Browns Ferry cable trays and supports seismic qualification will be covered under the NRC staff's program for Seisti.ic Qualification of Equipment in Operating Plants (Unresolved Safety Issue A-46).

A combination of field walkdowns and calculations was used to evaluate cable j

$ trays and supports. This program was submitted by TVA letter, dated May 2, 1986, and supplemented by letter, dated April 8. 1987 HRC concluded in their February 5, 1987 Safety Evaluation that the interim evaluation was acceptable and that plant restart would be permitted pending TVA's completion of identified modifications and verification that the interim acceptance criteria had been met. These conclusions are also reflected in Section 2.2.2.7 of NUREG-1232, Supplement 1, dated October 24, 1989. TVA notified NRC of the completion of this program by letter, dated September 12, 1989. Implementation of this program was reviewed by URC as documented in Inspection Reports 89-32, dated November 8, 1989, and 89-42, dated February 26, 1990.

TVA has determined that the issue of the seismic qualification of Units 1 and 3 cable trays and supports will be implemented, in accordance with the Unit 2 criteria and implementation precedent, prior to the restart of Units 1 and 3. Long-term operation of Units 1, 2, and 3 will require compliance with the final resolution of criteria and schedules associated with the generic resolution of USI A-46. TVA may re-evaluate this program upon issuance of the NRC Safety Evaluation of the SQUG generic implementation procedure and determine the need for any further action relative to restart.

ENCLOSURE 2 BROWNS FERRY NUCLEAR PLANT - UNITS 1 AND 3

SUMMARY

OF COMMITMENTS Seismic qualification cf Units 1 and 3 cable trayo and supports will be implemented, in accordance with the Unit 2 criteria and implementation precedent, prior to the restart of Units 1 and 3.

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