ML20094G675
| ML20094G675 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 02/28/1992 |
| From: | Joshua Wilson TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9203030232 | |
| Download: ML20094G675 (3) | |
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<3 6 y February 28 1992 U.S. Nuclear Regulatory Commission ATTN Document Control Desk Washington, D.C. 20555 Gentlement In the Matter of
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Docket Nos. 50-327 Tennessee Valley Authority
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50-328 SEQUOYAll NUCLEAR PLANT (SQN) - UNITS 1 AND 2 - DIESEL GENERATOR (DG)
RELIABILITY DATA REPORT The enclosed report provides details concerning the 6.9-kilovolt DGs installed at SQN. This report is being submitted in accordance with Technical Specification 6.9.2.2.
Please direct questions concerning this issue to K. C. k',-11er at (615) 843-7527.
Sincerely, h
.5 /W L. Wilson Enclosure cc:
See page 2 0201S,;
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1 9203o30232 v2022e PDR ADOCK 05000327 R.
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U.S. Nuclear Regulatory Conunission i
Page 2 Tebruary 28. 1992 cc (Enclosure):
Mr. D. E. Las.rge, Project Manager U.S. Nuclear Regulatory Conunission One White Filnt, North 11555 Rockville Pike Rockville Maryland 20852 HRC Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy. Tennessee 37379 Mr. B. A. Wilson, Project Chief U.S. Nuclear Regu'atory Conenission i
Region 11 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 b
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e SEQUOYAll HUCLEAR PLANT (SQN)
UNITS 1 AND 2 DIESEL GENERATOR (DG) RELIABILITY DATA REPORT FOR 1991 This report is submitted to comply with Technical Specification (TS) 6.9.2.2 for an annual data report on DG reliability.
The 6.9-kilovolt DGs at SQN-serve as the onsite Class 1E power source.
Surveillance requirements of the TSs that demonstrate DG operability are accomplished by the routine perf ormance of Surveillance Instructions (81s) 1-SI-0PS-082-007. A and B and 2-SI-0PS-082-007.A and B " Electrical Power System - Diesel Generator";
0-SI-0PS-082-007.0, " Diesel Generator Operability Verification"; the SI-26 series for loss of offsite power coincident with a safety injections the SI-102 series for periodic, vendor-recommended inspectional and the Standard Operating Instruction (SOI) 82 series for normal operation of DGs.
The information listed below is a tabulation of DG testing data taken from the aforementioned sis and/or S0ls. The data was taken from testing performed during the period January 1, 1991, through December 31, 1991.
" Valid test" and " invalid test" are defined in accordance with the criteria established in-Regulatory Guide 1.108 Havision 1, August 1977.
Illesel_ Generator
" slid _Icat Invalid _Iest failurca 1A-A 15 14 0
IB-B 16 23 1*
2A-A 12 23 0
2B-B 17 24 0
- Power CT failure during the performance of SI-26.1B The above data indicates an average of 36 starts per DG with one failure.
One failure out of 144 valid and invalid tests supports the high confidence level that the DGs will perform when required.
SQN continues to recognize the importance of reducing the number of DG starts as indicated by the trend below 19881 approx. 170 starts per DG per year 1989:
approx.
55 starts per DG per year 1990s approx.
36 starts per DG per year 1991:
36 starts per DG per year Continued effort will keep DC starts as low as possible and thereby enhance engine life and DG reliability.
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