ML20064B504
| ML20064B504 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 10/02/1990 |
| From: | Wallace E TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-89-06, GL-89-6, TAC-73707, TAC-73708, NUDOCS 9010180005 | |
| Download: ML20064B504 (3) | |
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TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 374ol SN 157B Lookout Place 00T 021990 U.S. Nuclear Regulatory Commission
.t ATTN: Document Control Desk-Washington, D.C.
20555 Gentlemen:
In the Matter of
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Docket Nos. 50-327 Tennessee Valley Authority
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50-328 SEQUOYAH NUCLEAR PLANT (SQN) - GENERIC LETTER 89-06. SAFETY PARAMETER DISPLAY SYSTEM (SPDS) e
Reference:
- NRC letter to TVA dated July 5, 1990, " Generic Letter 89-06 on-the Safety Parameter. Display System-(MPA F-072) i (TAC Nos. 73707/73708):- Sequoyah Nuclear Plant, Units.1 and 2" As requested.in the referenced letter, TVA: has reviewed the plan' for SQN to (1) perform an evaluation to-increase the reliability of the.SPDS, and-(2) modify the units and setpoints in the SPDS-to be consistent with emergency'-
operating instructions and main control room instrumentation.- As a result of the review, the required reliability _ improvements and unit and setpointi modifications will be made before restart from the Cycle 5' refueling outage j
for each unit.
I To improve reliability, TVA currently plans to (l) replace the Technical Support Center computer central processing unit,-(2) replace the computer-: disk _.
drives; and (3) install a Megatape subsystem for backups'and software updates. TVA has already installed availability software'inEthe. system to monitor availability-of the display generators, remote multiplexors, and the l
central processing unit.
Improvements have also been made.for Unit 1 in-bypassed and inoperable status instrumentation-(BISI) points; analog-multiplexor input cards; and hardware and software-for various postaccident monitors, radiation monitors, and several displays..These same changes are scheduled for Unit ~2 during the Cycle 4 refueling outage.
A summary statement of the commitments' contained in this' submittal is provided in the enclosure.
Please direct questions concerning this issue to Kathy,S~.o Whitaker at (615) 843-7748.
l-Very truly yours, L
9010100005 901002 TENNESSEE VALLEY AUTHORITY-m PDR ADOCK 05000327i
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PNUg bE.G.Wallace, Manager Nuclear Licensing'and l
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Pii Regulatory Affairs q
Enclosure ec:
See page 2 A
An Eqaal Opportunity Employer.
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U.S.! Nuclear Regulatory Conunission 00T 01MW cc (Enclosure)
Ms.-S. C. Black, Deputy Director Project Directorate II-4~
"i U.S. Nuclear Regulatory Commission
-One White Flint, North 11555 Rockville Pike Rockville,; Maryland 20852 i
Mr. J. N. Donohew r
Project Manager.-
l U.S. Nuclear Regulatory Commission i
One White Flint, North:
11555 Rockville Pike Rockville, Maryland 20852 NRC Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379 Mr. B. A. Wilson, Project Chief U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 I
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1 ENCLOSURE:
1 List of Commitments' e
I 1.
The required reliability improvements will be made before restart-from the.:
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Cycle 5 refueling oute3e for each unit..
p 2.
The required unit and setpoint modifications will'be made before restart I-f rom the' Cycle' 5 refueling outage for each ' unit.:
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