ML20084E675
| ML20084E675 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 02/24/1971 |
| From: | Amish K ROCHESTER GAS & ELECTRIC CORP. |
| To: | Morris P US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084E678 | List: |
| References | |
| NUDOCS 8304150248 | |
| Download: ML20084E675 (2) | |
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ROCHESTER GAS AND iLECTRIC CORPORATION e 89 EAST AVENUE, ROCHESTER, N.Y.14604
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<.oet w e February 24, 1971 Dr. Peter A. Morris, Director Division of Reactor Licensing W.
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U. S. Atomic Energy Commission 4,
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Subject:
Failure of 1A Diesel Generator to start.
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m Ginna Station tcat qf Docket #50-244 6
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Dear Dr. Morris:
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At approximately 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br /> on January 25, 1971, three Senior Reactor Operator candidates were granted permission to perform a training start of the 1A Diesel Generator at Ginna Gtation.
The 1A Diecel Generator did not start with the closing of the breaker and this was annunciated in the control room.
After resetting the alarm and in the presence of an operator, the unit failed to start the second time. The IB Diesel Generator was then started and left on the line with a load of approximately 600 KW.
It is significant to note that both of these generators,1A and 1B, had successfully performed during the normal surveillance check on January 11, 1971.
Immediate investigation disclosed that the l'A Diesel Generator.
l, failed to crank, that the engine and generator.were free to rotate, and that the air starting motor was inoperative.
{q Dismantling of the air motor disclosed a broken cylinder and damaged vanes which prevented rotation.~ Two complete air motor j'
[j assemblies and additional spare parts needed for repair of the damaged
. motor were located at the manufacturers and their deliveries arranged. =
Their immediate delivery was subsequently. delayed because of the
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blizzard of Wednesday, January 27,1971, but the two new air moter,
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assemblies were on the site on Friday, January 29,1971. Both new.
assemblies were disassembled, inspected and reassembled.
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., ROCHESTER GAS AND ELEC[ ) CORP.
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To Dr. Peter A. Morris f
In the interim, on Thursday evening, January 28,1971, at j
approximately 2055 hours0.0238 days <br />0.571 hours <br />0.0034 weeks <br />7.819275e-4 months <br />, the operating 1B Diesel Generator developed I
a fuel oil leak at the fuel oil filter differential switch. This line was 9
crimped to stop the leakage. Maintenance men removed the air-starting I
motor from the rtuming 1B Diesel Generator and installed it on the 1A Diesel Generator. This permitted the starting and loading of the 1 A Diesel Generator and the shutdown of the 1B Diesel Generator for fuel oil spillage cleanup and replacement of the leaky differential pressure switch. The air motor was again removed from the operating 1 A Diesel Generator and reinctalled on the 1B Diesel Generator which was then left in an automatic mode. This repair was completed at 0155 hours0.00179 days <br />0.0431 hours <br />2.562831e-4 weeks <br />5.89775e-5 months <br /> on Friday, January 20, 1971 With the receipt and inspection of the two new air starting motors a new such assembly was installed en the 1B Diesel Generator replacing the operable unit. This emergency generator was then start-tested, ruri for a period of time, aligned fcr automatic operation and placed on the line under a load of 600 K"I at 1520 hours0.0176 days <br />0.422 hours <br />0.00251 weeks <br />5.7836e-4 months <br /> on Jantary 30, 1071. Similarly, a new starting motor was installed en the 1 A Diesel Generator, successfully tested, and ther, placed in the automatic modo. The IB Diecel Generator was stopped and placed in the automatie mode at 1025 hours0.0119 days <br />0.285 hours <br />0.00169 weeks <br />3.900125e-4 months <br />. As required by the Technical Snecificationc, cne diecel was in op ration during the period of the investigaticns, repairs and rele9se; for automatic operation.
Immediate inspection of the original unfalled air starting motor revealed it to 1:e in perfect condition.
The failed air starting motor hnd a record of 135 successful starts at the factory and had accumulated an additicnal 135 starts at Ginna Station.
In addition to the factory starts the original and unfailed air-starting motor has accumulated 107 succersful starts at Cinna Station. It is to be noted that the majority cf the starts at Ginna Station were lcgged in operator training requirements.
.y Both the air starting motor supplier and the+Jiesel generator manufacturer were centacted and concur that it was an isolated failure.
These air starting mctors were quoted tc have many thousands of successful starts per year in diesel truck service.
Two complete spare air starting motors are on hand which include the unfailed and the rebuilt failed motor. Additional insnection instrudtion measures, as prescribed by the supplier, have been received and will be incorporated in the procedures at the Ginna Station.
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Very truly yours,
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jh^bf Jn z-l Keith W. Amish
[o Vice President
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