ML20150F917
| ML20150F917 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 07/08/1988 |
| From: | Gridley R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| Shared Package | |
| ML20150F920 | List: |
| References | |
| TAC-R00390, TAC-R00391, TAC-R390, TAC-R391, NUDOCS 8807190127 | |
| Download: ML20150F917 (3) | |
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TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 37401 SN 1578 Lookout Place JUL 081988 U.S. Nuclear Regulatory Commi:sion ATTN:
Document Control Desk Hashington, D.C.
20555 Gentlemen:
In the Matter of
)
Docket Nos. 50-327 Tennessee Valley Authority
)
50-328 SEQUOYAH NUCLEAR PLANT (SQN) - IMPROVEMENT PLAN FOR SQN DIESEL GENERATORS (DGs) TRANSIENT-VOLTAGE RESPONSE
References:
1.
Letter from TVA to NRC dated March 3,1988, "Sequoyah Nuclear Plant (SQN) - Diesel Gene:ators (DGs) -
Operability Analysis" 2.
Letter from TVA to NRC dated February 29,.1988, "Sequoyah Nuclear Plant (SQN) - D;esel Generators (DGs) - Operability and Analysis" The purpose of this letter is to inform NRC that TVA has completed the evaluation of ways to improve the SQN DGs transient-voltage response.
This letter also provides TVA's plan for optimum improvement of the DG transient-voltage respoase and fulfills the commitment made to NRC in reference 1.
TVA committed in reference 1 to evaluate Charles Concordia's comments regarding options for further improvements in the SQN DGs voltage regulation and excitation system response.
These comments were contained in the SQN Diesel Generator Evaluation Report as provided to NRC by reference 2.
TVA has evaluated each of Mr. Concordia's suggestions as well as other factors that could improve the SQN DGs voltage response.
The encl.osed report (enclosure 1) documents the results of this effort.
It also describes the three optimum improvement plans, the expected results of each option, and the projected schedule for the implementation of these modifications and the assoctated postmodification testing.
A qualitative evaluation of these options has shown that they will improve the DGs voltage response.
However, further testing of the DG system will be nec>ssarj in order to ascertain the amount of improvement related to each option.
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N 8807190127 380708 DR ADOCK 0500 7
An Equ.i Opre-+'mity Employer
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U.S. Nuclear Regulatory Commission M j 8 1888 TVA will initially institute optimum improvement plans 1 and 2, as described in enclosure 1, on one DG unit.
Upon completion of these modifications, the appropriate postmodification test (PMT) will be performed to determine the actual improvement in voltage response. An evaluation of these test results will also be performed.
If further voltage response improvemer.t is desired, the third optimum improvement plan will also be performed on the same DG unit followed by another PMT and evaluation of the test results. Upon completion of this effort, implementation of the appropriate modifications will be performed on the remaining DGs.
The current projected schedule is to have these improvements implemented and verified by the end of unit I cycle 4 refueling outage as stated by reference 1.
Summary statements of commitments contained in this submittal are prc ided in enclosure 2.
riease direct questions you may have concerning this issue to darry A. Kimsey at (615) 870-6847.
Very truly yours, TENNESSEE VALLEY AUTHORITY
'N l
.R.
- ridley, irector
' Nuclear Licensing and Regulatory Affairs cc (Enclo: ores).
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Ms. S. L. Black, Assistant Director for Projects TVA Projects Division i
U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 l
Mr. F. R. McCoy, Assistant Director for Inspection Programs TVA Projects Division U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30??3 Sequoyah Resident 'nspector Sequoyah Nuclear flant 2600 Igou Ferry R;ad Soddy Daisy, Tennessee 37379
ENCLOSURE 1 SEQUOYAH NUCLEAR PIANT DIESEL GENERATOR VOLTAGE RESPONSE IMPROVEMENT PLAN
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