ML19276H355
| ML19276H355 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 02/04/1974 |
| From: | John Miller METROPOLITAN EDISON CO. |
| To: | |
| Shared Package | |
| ML19276H353 | List: |
| References | |
| NUDOCS 7910160692 | |
| Download: ML19276H355 (2) | |
Text
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AETROPOLITAN EDISON COMPANY... =.ciabr arcensuvuucuriuriescaucuricn j OFFICE BOX 542 *REACl$G, PENNSYLVANI A 19CO3 TELEFiiONE 215 - 929-3601 February h, 197h Dr. D. R. Knuth, Director Directorate of Regulatory Operations United States Atocic Energy Cc==ission Washington, D. C.
20545
Subject:
Three Mile Island Units 1 and 2 Docket Nos. 50-289 and 50-320 Reactor Building Spray Pu=p Motors
Dear Dr. Knuth:
You were notified on January 3, 1974, of a situation which =ay be considered reportable under 10CFR50.55(e), " Conditions of Construction".
This situation related to Reactor Building Spray Pump Motors.
DESCRIiT?n" U.P INCIDENT The manufacturer of the Three Mile Island Unit 1 Reactor Building Spray Pump Motors advises that the starting tine of these notors does not meet the requirecents of the purchase order specification.
The motor: are 250 horsepower, 4000 volt, 60 H, 3600 RPM squirrel 2
cage water cooled cotors manufactured by Westinghouse's 3uffalo plant.
These motors are identified by Westinghouse shop order No. 68F20805.
The purchase order specification required these cotors to " accelerate their driven load to nor=al operating speed within six seconds at the worst voltage condition (i.e., 80% of rated voltage at the motor terminals)."
Westinghcuse advises that the ti=e required to accelerate load is as shown below:
Voltage, %
Acceleration Time, Sec. 100 3.9 90 6.0 85 7.8 80 11.4 1413 359 7
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AFETYIMPI)TIONS
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been perfor=ed by Gilbert AssociatesAn analysis of t Fe Engin
, Inc.
esel Generator loading has Motors are loaded as part of Block 4 of th The Reactor Euilding Spray Pump to the diesel generator, sequence as indicated on Table 8-1 of the e engineered safeguards loading volts) of the normal bus voltagthe initial bus voltage come 83% (3453 mately 86% of the cotor rated voltages of 4000 Ve (4160 volts).
This is approxi-ecreases to the high speed diesel generator excitBased on the data subm e
er will return the bus to full ratedgenerato voltage in 1.12 seconds.
diesel generator is below 100% voltageThe total time for =
voltage, plus the time a total of 5.02 seconds. This 5.02 second acceleration ti=e meets, is 1 of the purchase order specification within six seconds.
i.e.,
full loaded motor accelerationthe inte condition for starting the subject spray pu=p mThe die e represents the worst case otors.
CJfJ.ECTIVE ACTICN PRCPOSED OR TA'3N Unit 1 Spray Puup and cotor performance will bNo corrective action is e deconstrated during the Integrat Engineered Safeguards Activation Test (TP600/21)
Unit 2
Pumps are identical in type to the ThrThe motors for the Three M characteristic is more severe, howeveree Mile Island Unit 1 cotors.eactor Building Sp Three Mile Island Unit 2. This more se, vere loading results in acc ldue The load times that are longer than those report d f motors.
testin6 at voltages down to 80% of rat dThese motors have co e
e eration rned to Westinghouse for of solution to the Three Mile Island Unit 2 = t e voltage.
A decision on the method the measured acceleration times are av il bl o or problem will be made after a a e.
Very truly yours, '
,A aff
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lJ.G. Miller 0Y brh c:Mr. J. P. O'Reilly Vice President Mr. W. A. Verrochi 1413 360 9"
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