ML20009D841
| ML20009D841 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 06/25/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| IEB-79-27, NUDOCS 8107240405 | |
| Download: ML20009D841 (2) | |
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Mr. James P. O'Reilly, Director Office of Inspection and Enforcement h
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Region II - Suite 3100 b
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Atlanta, Georgia 30303 h'/
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Dear Mr. O'Reilly:
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0FFICE OF INSPECTION AND ENFORCEMENT BULLETIN 79 BROWNS FERRY NUCLEAR PLANT 259, -260, -296 By my letter to you dated June 26, 1980, we submitted the response to IE Bulletin 79-27 for the Browns Ferry Nuclear Plant.
That response outlined a problem with the reactor feedwater pump / main turbine control circuitry and stated that we would notify you of the long-term solution and its implementation schedule.
As a supplement to that response, we are submitting as an enclosure a description of the long-term modification design and a schedule for its implementation.
If you have any questions, please call Jim Domer at FTS 857-2014.
To the test of my knowledge, I declare the statements contained herein are complete and true.
Very truly yours, TENNESSEE VALLEY AUTHORITY
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L.'M. Mil 19, Manager Nuclear Regulation and Safety Enclosure oc (Enclosure):
Director of Reactor Operations Inspection Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Wuhington, DC 20555 Mr. Victor Stello, Jr., Director fh[
Office of Inspection and Enforcement g
U.S. Nuclear Regulatory Commission Washington, DC E0555
/f 8107240405 810625 PDR ADOCK 05000259 PDR G
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ENCLOSURE SUPPLEMENTAL RESPONSE TO IE BULLETIN 79-27
" LOSS OF NON-CLASS 1E INSTRUMENTATION AND CONTROL POWER SYSTEM BUS DURING OPERATION" BROWN 3 FERRY NUCLEAR PLANT (DOCKET NOS. 50-259, -260, -296)-
The long-term design solution to resolve the problems with the feedwater pump trip circuitry will consist of revising power supplies in the feedwater control system. The following changes wi'l be made to the feedwater control system power supplies to resolve the concerns addressed by NRC-0IE Bulletin
.79-27.
1 TVA/ General Electric (GE)
Change Power Supply Device No.
From To 1.
GE power supply 6-91 Unit preferred FW inverter 2.
LM-3-206 /6-72C Unit preferred FW inverter 3
LS-3-206/2-121C Unit preferred FW inverter 4.
XS-46-7/6-95 Unit preferred I&C Bus A 5.
GE power supply 6-93 FW inver:er Unit preferred 6.
LS-3-53 A/6-121 A FW inverter Unit preferred 7.
LM 53 A/6-72A FW inverter Unit preferred 8.
FM-46-6 /6-74 I&C Bus A Unit preferred 9
FT-1-13/6-51 A GE power supply GE power supply 6-93 6-91 10.
FT-3-78 A/6-50 A GE power supply GE power supply 6-93 6-91 The work will be completed on the following schedule:
Unit 1 by September 30, 1981 Unit 2 by September 30, 1982 Unit 3 by March 31, 1982 Implementation of these modifications on all three units of Browns Ferry will complete all work required to comply with IE Bulletin 79-27.
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