ML20064E296

Interim Deficiency Rept Re Increasing Noise & Vibration of Svc Water Pumps at Low to Medium Flows.Initially Reported on 790810.Temporary Operating Procedural Changes Implemented & Three Preliminary Tests Performed

ML20064E296
Person / Time
Site:	05000000, Zimmer
Issue date:	09/06/1979
From:	Borgmann E CINCINNATI GAS & ELECTRIC CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20064E073	List: ML20064E133 ML20064E148 ML20064E152 ML20064E173 ML20064E193 ML20064E217 ML20064E237 ML20064E253 ML20064E268 ML20064E283 ML20064E293 ML20064E296 ML20064E299 ML20064E307 ML20064E311 ML20064E419 ML20064E443
References
FOIA-82-206 10CFR-050.55E, 10CFR-50.55E, QA-1196, NUDOCS 8301050277
Download: ML20064E296 (2)

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THE CINCINNATI GAS & ELECTRIC COMPANY set -

CINCINN ATI.OMIO 4 5 20s ql9 E. A. BORG MAN N -

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i September 6,1979 l , QA-1196 U. S. Nuclear Regulatory Comission Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 Attention: Mr. James G. Keppler, Director RE: WM. H. ZIMMER NUCl. EAR POWER STATION - UNIT I 10CFR50.55(e) EVENT NO. 3-13.- SERVICE WATER PUMPS - DOCKET NO. 50-358, CONSTRUCTION PERMIT NO. CPPR-88, W.O. #57300-957, JOB E-5590 Gentlemen:

A potential problem with the Zimmer Power Station, Unit I Service Water Pumps was reported to the Nuclear Regulatory Commission Region III Offices by telephone conversation with personnel of the Cincinnati Gas & Electric Company on August 10, 1979.

In accordance with 10CFR50.55(e), an interim report is required to be submitted to the NRC within 30 days of the initial notification of the deficiency. This letter is intended to fulfill that 30 day status report requirement. Additional status reports will be iss.ued. until the matter is resolved.

In field tests conducted on August 9, 1979, the service water pumps were observed under various operating flows. It was observed that at system design flow and above, operation was smooth. At low to medium flows an increase in noise and vibration was apparent.

. As a result of these tests, temporary operating procedural changes have been implemented to keep the pumps at or above their design capacity by opening the dilution water valves. At this time The Cincinnati Gas 8 Electric Company is reviewing the possibility of changing the control scheme to assure operation in the smooth operating range of the pumps over the full range of plant operat-ing conditions.

The situation is being reviewed with the pump vendor, Bingham Willamette.

One of the service water pumps has been returned to the factory for repair and 8301050277 821116 SEP 131979 PDR FOIA DEVINE82-206 PDR .

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U. S. Nuclea'r Regulatory Commission Region III - September 6,1979 QA-1196 - Pags 2 e

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I testing. As of August 31, 1979, three preliminary tests have been performed.

The first test was with a new impeller of the original design. The results of this test confirmed field test results that at design capacity and above

! the pump operated satisfactorily. Noise and vibration were only present at lower flows. The second test involved an impeller modification, but due to mechanical difficulties in the test installation, the data was not meaningful.

The third test was made with a modified impeller. This arrangement allowed a larger flow range without excessive noise or vibration. Design flow conditions were not changed. Continued testing is anticipated during the weeks of September 3, 1979 and September 10, 1979. Complete test results and recommend-ations are expected from Bingham-Willamette by mid October. We wish to defer a final decision on whether this is a reportable event until all tests are completed.

We trust that this letter will fulfill the requirements of 10CFR50.55(e) as an interim report.

Very truly yours, THE CINCINNATI GAS & ELECTRIC COMPANY By E. A. BORGMANN rf" SENIOR VICE PRESIDENT JFW:pa O

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