ML20235F191
| ML20235F191 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 02/16/1989 |
| From: | Shawn Smith TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| RTR-REGGD-01.108, RTR-REGGD-1.108 NUDOCS 8902220454 | |
| Download: ML20235F191 (2) | |
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TENNESSEE VALLEY AUTHORITY Sequoyah Nuclear Plant Post Office Box 2000 Soddy-Daisy, Tennessee 37379 February 16, 1989 U. S.' Nuclear Regulatory Commission Document Control Desk Washington, DC 20555
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Gentlemen:
TENNESSEE VALLEY AUTHORITY - SEQUOYAH NUCLEAR PLANT UNIT 1 AND 2 - DOCKET-NOS. 50-327 AND 50-328.- FACILITY OPERATING LICENSE DPR-77 AND DIESEL CENERATOR RELIABILITY DATA REPORT The enclosed special report provides details'concerning the 6.9kV diesel generator reliability. This report is submitted in accordance with Technical Specification 6.9.2.2.
Very truly yours, TENNESSEE VALLEY AUTHORITY s.
S dNmit Plant Manager 4
Enclosure cc (Enclosure):
4 J. Nelson Grace, Regional Administrator U. S. Nuclear Regulatory Commission Suite 2900 101 Marietta Street, NW Atlanta, Georgia 30323
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Records Center Institute of Nuclear Power Operations Suite 1500 1100 Circle 75 Parkway Atlanta, Georgia 30339 NRC Inspector, Sequoyah Nucleat' Plant
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.m-t SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 DIESEL GENERATOR RELIABILITY DATA' REPORT This report is submitted ' pursuant to Technical ~ Specification 6.9.2.2 to satisfy the requirement for a yearly data report on diesel generator 4 '
reliability.
The'6.9-kV diesel generators at Sequoyah Nuclear Plant serve as the onsite class 1E power source. Surveillance requirements'of Technical Specifications which demonstrate diesel generator operability are
. accomplished by the routine performance of Surveillance Instruction (SI)-7,
" Electrical Power System:
Diesel Generators Unit 0, 1, and 2," SI-7.1,
" Diesel Generator AC Electrical Power Source Operability Verification
.(Diesel Generator /Offsite Source) - Units 1 and 2," the SI-?6 series for loss of offsite power coincident with a safety injection, and the SI-102 series for the. inspection of diesel generators. Listed below is a tabulation of diesel genarator testing data recorded during the performance of the aforementioned sis as well as data recorded during the performance of special test' instructions and special maintenance instructions.
The data was taken from testing performed during the period between January 1, 1988 and December 31, 1988.
" Valid tests" and " invalid tests" are defined in accordance with the criteria established in Regulatory Guide 1.108, Revision 1, August-1977.
Diesel' Generator Valid Tests Invalid Tests Failures
.1A-A 13 160 0
1B-B 16 164 0
2A-A 12 158 0
2B-B 11 155 0
The above data of approximately 170 starts per diesel generator with no recorded failures supports the conclusion that the reliable performance of the 6.9-kV-diesel generators at Sequoyah Nuclear Plant provides a high confidence. level the diesel generators will perform if required.
TVA recognizes the importance of reducing the number of diesel generator starts and recently has received a requested change to Technical Specifications.
Before the change, Technical Specifications required, in parti that the remaining diesel generators be demonstrated operable within
'one hour and every eight hours when a diesel generator became inoperabic.
The recent change requires, in part, that the remaining diesel generators be demonstrated' operable within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after a diesel generator becomes inoperable.
Since the majority of routine maintenance activities can be performed in less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, this change should greatly reduce the number of required starts of each 6.9-kV diesel generator, thereby increasing engine life without compromising reliability.
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