ML20084E099
| ML20084E099 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 12/10/1974 |
| From: | Platt C ROCHESTER GAS & ELECTRIC CORP. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20084E098 | List: |
| References | |
| AO-50-244-74-20, NUDOCS 8304140091 | |
| Download: ML20084E099 (1) | |
Text
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n' ROCHESTER GAS AND ELGCTRIC CORPORATION e 89 EAST AVENUE, ROCHESTER, N.Y.14649
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N Jo December 10, 1974 N
Ch 7
C Mr. James P. O'Reilly, Director I
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Directorate of Regulatory Operations
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U, Re: Abnormal Occurrence 74-20: Observed inadequacies in the implementation of administrative or procedural controls such that the inadequacy causes or threatens to cause the existence or development of an unsafe condition in connection with the operation of the plant Ginna Station - Docket #50-244
Dear Mr. O'Reilly:
The "B" motor driven auxiliary feedwater pump rotating assembly was recently re-placed. A flow check was done to verify pump operability. After analyzing the results of the flow check (PT-16),and reviewing the results of a prior flow bal-ance (PT-16.1 ) for the two motor driven auxiliary feedwater pumps, it was dis-covered that there was a deficiency in the PT-16 flow check procedure.
The pro-cedure did not take into account the pressure drop across the' two motor-driven auxiliary feedwater pump discharge valves.
Because of the deficiency in the procedure, as the' efficiency of the motor-driven auxiliary feedwater pumps decreased from use, the limit on the open posi-tion of the two valves would have prevented each of the two motor-driven pumps from pumping 200 gpm if the steam generator pressures were 1100 psia (accident condition).
The limit on the open position of each of the two valves has been removed.
PT-16.1 (Auxiliary Feedwater System Flow Balance) has been rerun. The revised PT-16 (Flowcheck) procedure has been used to verify that each of the two motor driven auxiliary feedwater pumps will satisfy the accident condition.
Very truly yours,
{W E-Charles E. Platt-Superintendent cca Mr. J. F. O' Leary, AEC h <h q,[-
Mr. G. J. Swa rthou t, RC&E r
[A ggC1 Mr. L. D. White, Jr., RC&E DR COPY SENT BEGION S