ML20004B902

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Auxiliary Feedwater Pumps Presently Installed at Beaver Valley Power Station,Unit 1
ML20004B902
Person / Time
Site: Beaver Valley
Issue date: 05/22/1981
From: Burski R, Ireland R, Sieber J
DUQUESNE LIGHT CO.
To:
Shared Package
ML20004B901 List:
References
NUDOCS 8106010278
Download: ML20004B902 (17)
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DUQUESNE LIGHT COMPANY Power Stations Department Beaver Valley Power Station, Unit No. 1 Report Auxiliary Feedwater Pumps Presently Installed at Beaver Valley Power Station, Unit No. 1

'Y i

Submitted by:

R. N. Ireland Reviewed by:

[ bud' R. F. Burski Approved by:

(/ J. D. Sieber 22 fY$l Date:

?,ga y

f 8106010g7y ES DOCUMENi CONTAINS P00R QUAUTY PAGES L

DUQUESNE LIGHT COMPANY Nuclear Safety and Liceneing Department Beaver Valley Power Station, Unit No. 1 Report Auxiliary Feedwater Pump Endurance Test I.

Introduction The three auxiliary feedwater pumps are located in the east safeguards FW-P-2 is a 6-stage centrifugal pump connected by a Falk oupling area.

to a Terry steam turbine rated at 710 hp at 5200 rpm.

FW-P-3A and 3B are horizontal 8-stage motor driven centrigural pumps rated at 350 gpm each connected by Falk couplings to 400 hp, 4160V, 3600 rpm squirrel cage induction motors. The primary water supply for these pumps is maintained in a 152,000 gallon seismic category 1 Primary Plant Demineralized Water Storage Tank. The purpose of tne tests was to verify the proper operation of the Auxiliary Feedwater Pumps in the recirculation and Steam Generator feed flow modes.

II.

Summary of the Auxiliary Feedwater Pump Endurance Test During the first phase of the test, each pump was operated in the recirculation mode for 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />. Following the 48-hour pump run, the pumps were ahutdown until the pump temperatures were reduced to within 20 F of their values at the start of the 48-hour test and at least 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> had elapsed. The pumps were then operated again for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> in the recirculation mode, then the feedwater system was realigned to provide the normal auxiliary feed flow path to the steam generators to verify that the pumps could provids design flow at no load steam pressure.

Figure 1 illustrates a flow diagram of the test method. Data were recorded as to the pump suction and discharge pressures, pump flow, pump speed, vibration and bearing temperatures throughout the testing period. Figure 2 depicts the location of the areas on the pumps and drives where vibration and temperatures were measured. Vibration was measured using the IRD Model 308 vibration measuring instrument; the bearing temperatures were monitored using a contact pyrometer.

Figures 3a, 3b, and 3c and 4a, 4b, and 4c plot the number 3 and 4 1

bearing oil temperatures versus time of the respective bearings.

Environmental conditions in the auxiliary feedwater pump area were also monitored'to ensure temperature and humidity limits for safety related equipment were not exceeded. Figures Sa, 5b, and 5c and 6a, 6b, and 6e plot the ambient temperatures and himidity versus time during the respective pump test.

7

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l III. Design Verification A.

Motor Driven Auxiliary Feedwater Pumps FW-P-3A and 3B The acceptance criteria for maximum lube oil temperature was 160 F; the maximum lube oil temperature recorded for any pump was 132 F for the 3B pump.

The recirculation flow acceptance criteria was 135 + 65/-0 gpm, the flows on both pumps being near the upper limit of 200 gpm with FW-P-3B being recorded at 200 gpm.

The acgeptance criteria for the ambient room temperature was 40 to 140 F with a maximum temperature reading of 90 F which occurred during testing of FW-P-3B.

The humidity acceptance criteria was 20 to 100%; a maximum recorded value of 88% occurred during testing of FW-P-3A.

Acceptance criteria for Steam Generator feed flow was to verify an obstruction free path between the feedwater pumps and the Steam Generators.

The feed flow of FW-P-3A was 345 gpm and the flow of W-P-3B t.as 352 gpm.

FW-P-3A was operated for 10 minutes in a run-out flow test to pump water to ths depressurized Steam Generator; flow to the 1A, 1B and 1C Steam Generators was respectively 245, 230 and 255 gpm.

At these flows, the maximum motor current recorded was 42 amps which was less than the overcurrent trip point of 60 amps.

The vibration data obtained throughout the testing period was compared to the IAW ASME Section XI, Table IWP-3100-2 using the IRD General Machinery Vibration Severity Chart and was found to be acceptable.

B.

Turbine Driven Auxiliary Feedwater Pump FW-P-2 The acceptance criteria for maximum recorded lube oil temperature was 160 F; the maximum value recorded for bearing lube oil tem-perature was 138 F.

The recirculatio2 flow acceptance criteria was 250 + 75/-0 gym; the flow on this pump being recorded as 273 gpm. The acceptance criteria for the ambient room temperature was 40 to 140 F with a maximum temperature reading of 83 F during operation of this pump. The humidity acceptance criteria was 20 to 100%; a maximum racorded value of 83% occurred during this pump test. Acceptance criteria for Steam Generator feed flow was to verify an obstruction free path between the feedwater pumps and the Steam Generators. The flow of FW-P-2 was 700 gpm.

The vibration data obtained throughout the testing period was compared to the IAW ASME Section XI, Table IWP-3100-2 using the IRD General Machinery Vibration Severity Chart and was found to be acceptable.

IV.

Conclusion The testing which has been successfully performed has demonstrated that the Auxiliary Feedwater Pumps at the Beaver Valley Power Station are fully capable of performing their design function and will provide long term reliable operation if and when required. -

OTilER ALTEntJATIVE WATER SOURCES o USE OF Fine (Dif SEL PUMPS) SYST EM UUC WITIl filVER W A1ER

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