ML20046D344

Summary of 930708 Meeting W/Util in Rockville,Md Re Implementation of Recommendations of Bulletin 93-03 at Plant.List of Attendees & Handouts Encl

ML20046D344
Person / Time
Site:	Browns Ferry
Issue date:	08/10/1993
From:	Hebdon F Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
IEB-93-003, IEB-93-3, NUDOCS 9308180126
Download: ML20046D344 (15)

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UNITED STATES i($C,#

NUCLEAR REGULATORY COMMISSION m

wAssiwcTou. o.c. 2osswooi August 10, 1993 Docket Nos. 50-259, 50-260 and 50-296 LICENSEE: Tennessee Valley Authority FACILITY: Browns Ferry Nuclear Plant, Units 1, 2, and 3

SUMMARY

OF THE JULY 28, 1993 MEETING REGARDING IMPLEMENTATION OF BULLETIN 93-03 AT THE BROWNS FERRY NUCLEAR PLANT On July 28, 1993, representatives of the NRC staff and the Tennessee Valley Authority (TVA) met in Rockville, Maryland to discuss implementation of the recommendations of Bulletin 93-03 at the Browns Ferry Nuclear Plant (BFN),

Meeting attendees are listed in Enclosure 1. contains handouts provided by the licensee.

Bulletin 93-03 requested boiling water reactor (BWR) licensees to install modifications tc the reactor vessel level instrumentation.

These modifications are intended to prevent indication errors caused by degassification of water in the instrument reference legs as the reactor system depressurizes.

Bulletin 93-03 requested that licensees make the modifications before reactor startup from the first cold shutdown after July 30, 1993.

TVA representatives stated they anticipate they will not be able to meet the requested schedule for BFN Unit 2.

To perform the modification, TVA's engineering design will use data from a BWR Owners Group program report which j

has not yet been published.

TVA also needs to resolve design issues such as thermal stresses and impact on safe shutdown capability for postulated fires.

Therefore, the modification design is not expected to be complete until early September 1993.

TVA is also having difficulty obtaining parts required for i

the modification.

Some par +c are not expected to be available until November 1993, though TVA is working to shorten this schedule.

Furthermore, TVA expe-ts that enforcement discretion will be required to permit installation of the modification with fuel in the reactor vessel.

To justify the schedule delay, TVA stated that they do not expect the BFN reactor vessel instrumentation to be vulnerable to the degassificatic.n-induced They noted that BFN uses relatively large diameter (1 inch) tubing, errors.

which is less likely to trap bubbles as gases come out of solution.

They also noted that the tubing routing is not considered likely to trap bubbles at high points or in long horizontal sections.

TVA also stated that BFN has electrical interlocks which prevent opening large pathways to drain the reactor vessel.

MRC RE CENTER COPY 9308180126 930810 PDR ADDCK 05000259 G

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The staff noted that other licensees face similar constraints, and yet have completed modifications.

TVA did not present any new issues to the staff. A

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key element-in staff acceptance of a deferred implementation schedule is how j

aggressively the licensee has pursued a solution.

While BFN may have. features j

that mitigate degassification effects, these features are not unique to Browns Ferry, and the benefit of these features has not yet been established.

Therefore, the staff cannot accept schedule deferral for these reasons alone.

f)7keenc %

Frederick J. Hebdon, Director Project Directorate 11-4 Division of Reactor Projects - 1/11 Office of Nuclear Reactor Regulation

Enclosures:

l.

Attendance List 2.

TVA Handout cc w/ enclosure:

See next page

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2 The staff noted that other licensees face similar constraints, and yet have completed modifications.

TVA did not present any new issues to the staff.

A key element in staff acceptance of a deferred implementation schedule is how aggressively the licensee has pursued a solution. While BFN may have-features that mitigate degassification effects, these features are not unique to Browns Ferry, and the benefit of these features has not yet been established.

Therefore, the staff cannot accept schedule deferral for these reasons alone.

j Original signed by Mohan Thadani for I

Frederick J. Hebdon, Director Project Directorate II-4 i

Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation j

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Enclosures:

1.

Attendance List i

2.

TVA Handout l

cc w/ enclosure:

See next page 3

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I CC-Mr. W. H. Kennoy, Director State Health Officer Tennessee Valley Authority.

Alabama Dept. of Public Health ET 12A 434 Monroe Street 400. West Summit Hill Drive Montgomery, Alabama 36130-1701 i

Knoxville, Tennessee 37902 Mr. R. M. Eytchison, Vice P.asident Regional Administrator Nuclear Operations U.S.N.R.C. Region II Tennessee Valley Authority 101 Marietta Street, N.W.

3B Lookout Place Suite 2900 1101 Market Street Atlanta, Georgia 30323 Chattanooga, Tennessee 37402-2801 Mr. Charles Patterson Site Licensing Manager Senior Resident Inspector Browns Ferry Nuclear Plant Browns Ferry Nuclear Plant Tennessee Valley Authority U.S.N.R.C.

P.O. Box 2000 Route 12, Box 637 Decatur, Alabama 35609-2000 Athens, Alabama 35611 Mr. O. J. Zeringue, Vice President Manager, Nuclear Assurance Browns Ferry Nuclear Plant and Licensing Tennessee Valley Authority Browns Ferry Nuclear Plant P.O. Box 2000 Tennessee Valley Authority Decatur, Alabama 35609-2000 P. O. Box 2000 Decatur, Alabama 35609-2000 l

Mr. B. S. Schofield, Manager Dr. Mark 0..Medford, Vice President Nuclear Licensing and Regulatory Affairs Technical Support Tennessee Valley Authority Tennessee Valley Authority

'l SB Lookout Place 3B Lookout Place 1101 Market Street 1101 Market Street Chattanooga, Tennessee 37402-2801 Chattanooga, Tennessee 37402-2801 TVA Representative Tennessee Valley Authority 11921 Rockville Pike Suite 402 Rockville, Maryland 20852 General Counsel Tennessee Valley Authority i

ET llH 400 West Summit Hill Drive Knoxville, Tennessee 37902 Chairman, Limestone County Commission P.O. Box 188 Athens, Alabama 35611 s

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ENCLOSURE 1 l

ATTENDEES JULY 28, 1993 TVA/NRC MEETING l

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IMPLEMENTATION OF BULLETIN 93-03 AT BROWNS FERRY NAME ORGANIZATION Joe Williams NRR/PDII-4 Jim Clifford NRR/PDV Pedro Salas TVA/ Licensing Jim Maddox TVA - BFN Engineering Dave Burrell TVA - BFN Engineering i

Warren Lyon NRR/SRXB David White TVA/RSER Robert C. Jones NRR/SRXB i

Gus Lainas AD Ril Dave Trimble NRR/PDII-4 l

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ENCLOSURE 2 TVA - BROWNS FERRY PRESENTATION OF IMPLEMENTATION OF NRC BULLETIN 93-03 i

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1. SHORT TERM COMPENSATORY MEASURES TVA TRENDS WATER LEVEL INDICATION INTERLOCKS INSTALLED WHICH: PREVENT RPV DRAIN DOWN COMPLETED TRAINING FOR NONCONDENSIBLE IN REFERENCE LEGS FOR BOTH'HIGH PRESSURE EVENTS AND NORMAL COOLDOWN EVENTS OPERATOR PRECAUTIONS IN PROCEDURES TO ADDRESS LEVEL ANOMALIES 2.-HARDWARE MODIFICATION REQUEST FOR APPROVAL OF IMPLEMENTATION SCHEDULE IMPLEMENT MODIFICATION DUE TO FORCED COLD SHUTDOWN AFTER NOVEMBER 1993

. DESIGN RESTRAINTS:

THERMAL STRESS ON RPV NOZZLE, STEAM LEG PIPING AND CONDENSATE POT - AUGUST 15,1993 CRD SYSTEM TRANSIENTS AND NOISE OUT OF SERVICE TIME FOR BACKFILL APPENDIX R CONSIDERATIONS - HEATUP OF BACKFILL LINES CAUSES INDICATION GREATER THAN ACTUAL DUE TO WATER DENSITY CHANGES TO REFERENCE LEG FINAL RECEIPT AND ACCEPTANCE OF BWROG/EPRI DE-GAS-1 TESTING LATE AUGUST 1993 4

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- FLOW MEASURING INSTRUMENTS-NOV 1993 IMPLEMENTATION RESTRICTIONS:

CRD LINE INSTALLATION - DESIGN. ISSUE 9/3/93 CRD TIE-IN PLANT SHUTDOWN OR RWCU OUT OF 1

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