ML20082A425
| ML20082A425 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 11/01/1983 |
| From: | Manno S NIAGARA MOHAWK POWER CORP. |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| RTR-NUREG-0869, RTR-NUREG-869 10CFR-050.55E, 10CFR-50.55E, 7636, NUDOCS 8311180142 | |
| Download: ML20082A425 (2) | |
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n UMOHAWK N MWK POWER CORPORATION /300 ERIE BOULEVARD WEST, SYRACUSE, N.Y.13202/ TELEPHONE (315) 474-1511 SAMUEL F. MANNO VICE PRESIDENT NUCLEAR CONSTRUCTION Novanber 1,1983 (7636)
Mr. R. W. Starostecki, Director 2
U.S. Nuclear Regulatory Commission Region I Division of Project and Resident Programs 631 Park Avenue King of Prussia, PA 19406 Re: Nine Mile Point Unit 2 Docket No. 50-410
Dear Mr. Starostecki:
Enclosed is a final report in accordance with 10CFR50.55(e) for the problem regarding vortex formation at ECCS pumps' suction lines.
This problem was reported via telecon to Mr. R. Gallo of your staff on September 30, 1983.
Very truly yours.
S.I.. Manno &
SFM/TL:ja Enclosure xc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 Mr. R. Gramm, Resident Inspector 8311100142 831101 DR ADOCK 05000 1
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NIAGARA M0 HAWK POWER CORPORATION NINE MILE POINT - UNIT 2
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DOCKET NO. 50-410 Final Report for a Problem Regarding lortex Formation at ECCS Pumps' Suction Lines Description of the Problem ECCS pumps' suction lines are located inside the suppression r;ol at a centerline depth of 2 ft.-8 in below the minimum pool drawdown water level.
This submergence depth of the suction lines may not be adequate to ensure that vertex formation would not occur during a drawdown condition.
Analysis of Safety Implications A Stone & Webster Engineering Corporation evaluation indicates that air could be drawn into the ECCS pumps' suction lines as a result of vortex formation during a drawndown condition.
Depending upon the amount of air drawn into the suction lines, the operation of the ECCS systems could degrade and thus adversely affect the safe operation of the plant.
Corrective Action The ECCS pumps' suction lines in the suppression pool will be modified to provide adequate submergence. This will also satisfy the suction line inlet requirements given in NUREG 0869 dated April 1983 (issued for comments).
The corrective action will be completed by August 31, 1984.
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