ML18033A979
| ML18033A979 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 10/04/1989 |
| From: | Michael Ray TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 8910120042 | |
| Download: ML18033A979 (6) | |
Text
AC CELE RATED DIPBUTI ON DEMONSTR+ON SYSI'EM p.1 e
REGULATORY INFORMATION DISTRXBUTION SYSTEM (RIDS)
ACCESSION NBR-8910120042 DOC.DATE: 89/10/04 NOTARIZED: NO DOCKET FACIL:50-260 Browns Ferry Nuclear Power Station, Unit. 2, Tennessee 05000260 AUTH.NAME AUTHOR AFFILIATION RAY,M.J.
Tennessee Valley Authority RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
SUBJECT:
Provides results of util review of unqualified coatings on components installed inside primary containment at plant.
DISTRIBUTION CODE:
D030D COPIES RECEIVED:LTR ENCL SXZE:
TITLE: TVA Facilities Routine Correspondence NOTES:1 Copy each to: S.Black,D.M.Crutchfield,B.D.Liaw,
.-;~ R.Pierson,B.Wilson 05000260 RECIPIENT ID CODE/NAME LA GEARS,G INTERNAL: ACRS OC/BFMB EG FILE EXTERNAL: LPDR NSIC NOTES COPXES LT'gR ENCL RECIPIENT ID CODE/NAME PD NUDOCS-ABSTRACT OGC/HDS2 NRC PDR COPIES LTTR ENCL D
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TOTAL NUMBER OF COPIES REQUIRED:
LTTR 16 ENCL
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TENNESSEE YALLEYAUTHORITY CHATTANOOGA. TENNESSEE 37401 SN 157B Lookout Place OCT 0,4 1888 U.S. Nuclear Regulatory Commission ATTN:
Document Control Desk Nashington, D.C.
205SS Gentlemen:
In the Matter of
)
Tennessee Valley Authority
)
BRONNS'- FERRY NUCLEAR PLANT (BFN) CONTAINMENT COATINGS This letter provides the results of TVA's review of unqualified coatings on components installed inside primary containment at BFN.
As committed to in Section III.14.3 of the BFN Nuclear Performance Plan, this review was performed to identify the quantity of existing unqualified coatings, determine the allowable quantity, and implement any required corrective actions before Unit 2 restart.
The issue of concern is the potential for loss of coolant accident (LOCA) generated coating debris to block the suction strainers and thereby adversely affect the ability of the emergency core cooling system (ECCS) pumps to maintain long-term cooling of the core and containment.
Docket No. 50-260 A walkdown was performed to baseline the uncontrolled coating log and assess the general condition of existing qualified coatings.
An analysis was performed to determine the maximum allowable quantity of coating debris which could be transported to the suction stra) ners without affecting the ability of the ECCS pumps to perform their function post-LOCA.
In this review it was conservatively assumed that no debris was trapped by the numerous structures and components inside the drywell and no credit was taken for the breakup of the debris.
The results of the walkdown indicate that the quantity and type of,existing unqualified coatings are less than the maximum allowable quantity. " A procedure, Site Directors Standard Practice (SDSP) 9.18, has been i'ssued which requires an engineering review of additions to existing quantities of unqualified coatings.
In summary, TVA has determined that the existing amount of unqualified coatings within primary containment is less than the amount which would adversely affect ECCS pump performance in a post-LOCA condition.
In addi tion, corrective actions have been taken to ensure that theaddition of unqualified coating quantities is maintained below the maxi'mum allowable quantity,,
This evaluation is documented in Quality Information Release MTBBFN88025 R3.
This document and its supporting calculations are available for review at TVA's office in Rockville, Maryland.
8910120042 891004 PDR ADOCK 05000260 P
PDC An Equal Opportunity Employer g0 l 0
U.S. Nuclear Regulatory Commission 08T g4 1888 Please refer any questions concerning this submittal to Patrick Carier, BFN Site Licensing, (205) 729-3570.
Very truly yours, TENNESSEE VALLEY AUTHORITY cc:
Ms, S.
C. Black, Assistant Director for Projects TVA Projects Division U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockvi lie, Maryland 20852 Mr. B. A. Wilson, Assistant Director for Inspection Programs TVA Projects Division U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Browns Ferry Resident Inspector Browns Ferry Nuclear Plant Route 12, Box 637
- Athens, Alabama 35609-2000 M n er, uc ar Licensing and Regulatory Affairs
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