ML20031D232

Auxiliary Feedwater Pump Performance Test

ML20031D232
Person / Time
Site:	McGuire, Mcguire
Issue date:	10/05/1981
From:	DUKE POWER CO.
To:
Shared Package
ML20031D230	List: ML20031D229 ML20031D232
References
NUDOCS 8110130168
Download: ML20031D232 (8)

Text

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McGuire Nuclear Station Auxiliary Feedwater Pump Performance Test Description of Test The objectives of this 48-Hour endurance test were to demonstrate that the performance characteristics of the turbine driven Auxiliary Feed-water Pump remain within design limits. These characteristics include i

pump and turbine bearing temperatures, pump vibration, pump flow rates, and pump room temperature and humidity.

The 48-Hour run of the turbine driven Auxiliary Feedwater (AFW) Pump was performed as near to normal operating conditions as plant conditions would allow. Reactor power remained between 2% and 3% of full power throughout the test.

The steam supply to the Auxiliary Feedwater Pump was aligned to allow a continuous bleed of stram thru the turbine and out the exhaust to the atmosphere while the pump was not in operation.

(See Figure 10.3.2-1 (3 of 3) in the Final Safety Analysis Report).

Steam generator pressure was approximately 1050 psi and remained constant through-out the test.

The AFW pump suction was aligned to take suction on the Upper Surge Tank I

i and discharge either to the Upper Surge Tank dome or to Steam Generators lA,1B,1C, and 1D as needed.

The AFW pump was started from the Control Room and run at approximately 3600 rpm for 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />. All appropriate data were recorded every four hours. At the end of 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> the pump l

was stopped and allowed to cool for approximately 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />. However, be-cause of the continuous steam sieed, the steam lines did not cool to room temperature.

The pump was tho2 restarted and run for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and data I

were recorded.

Pump room temperature was measured with a hand held pyrometer and room humidity with a psychrometer.

Bearing sie.'.1 temperature was measured l

with in-place thermocouples as read by the plant computer. Pump vibra-tion was measured with a hand held IRD Mechanalysis Vibration Meter on i

the inboard bearing in the vertical and horizontal direction at the lo-8110130168 811005 (1)

PDR ADOCK 0S000369 P

PDR

cation shown below in Figure 1.

Pump speed, flow, suction and discharge pressures, steam banerator pres-sures and percent power were all measured using plant process instru-mentation.

A graphical representation of the results of the test are shown in Figures 2 and 3.

After approximately 13 hours1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br /> 45 minutes of the test the flow path was realigned from recir.ulation to Steam Gener-ators lA, 1B, 1C, and 1D.

Pump vibration decre. sed and turbine bearing temperatures increased. After 27 minutes the flow path was changed back to recirculation. As expected, these temperatures dropped back to their previous levels. At 20 1/2 hours into the test the flow path vn aligned to the steam generators for the duration of the test.

From the graphs it can be seen that all measured parnmeters stabilized during both modes of operating the pump. During the 1-hour post-test run of the pump, pump discharge was aligned to the recirculation path. All points measured at the end of this hour are in agreement with data obtained during the 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> run.

Table 1 is a summary of all data obtained during the entire test.

A review of the operating logs was conducted to determine the length of tic e eat. motor driven auxiliary feedwater pump was run during the hot functional testing program. Table 2 is a tabulation of the length of continuous runs for each of the pumps during this testing program. No specific test data were recorded; however, the pump perfermance was sat-isfactory and no problems were noted as a result of these extended run times.

i Analysis of Results l

While pump flow was directed to the steam generators, vibration was low-i er and pump bearing temperatures were lower than when flow was totally in recirculation. This is due to a lower discharge pressure. Turbine bearing temperatures were higher while feeding the steam generators due to an increased steam flow thru the turbine.

Bearing temperature de-sign limits of 180 F for the pump and 200 F for the turbine were not ex-ceeded. Pump vibration did not exceed the allowable limits of 2 mils in the horizontal direction and 2 mils in the vertical direction.

(2) l

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At approximately 13 hours1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br /> into the test an access door was found to be open in the exhaust ventilation system for the pump room resulting in reduced room cooling.

This was corrected and room temperature and hum-idity dropped slightly. However, at no time during the test did the pump room ambient conditions exceed the normal maxinum design tempera-ture for the room or safety-related equipment in the rcom.

This test demonstrates that equipment in the turbine pump room will function pro-perly under these conditions.

Conclusion On the basis of the results of thie test and pump performance observed to date it is concluded that the auxiliary Feedwater Pumps and other equipment in the pump rooms have met the established acceptance criteria and have demonstrated the ability to perform satirfactorily over extend-ed periods of time.

t (3)

i Il0URS Start 4

8 12 16 20 24 28 32 36 40 44 48 51 Vibration - llorizontal (mils) 0.75 0.60 0.60 0.44 0.50 0.58 0.42 0.45 0.47 0.60 0.55 0.50 0.46 0.60 Vibration - Vertical (mils) 1.00 1.00 1.00

-1.24 1.30 0.45 0.35 ~ 0.42 0.47 0.50 0.55 0.55 0.44 1.30 Pump I/B Bearing Temp. ( F) 102.2 124.9 125.8 126.2 126.2 125.5 124.4 123.7 124.5 123.7 122.9 123.5 124.6 124.3 Pump 0/B Bearing Temp. ( F) 98.4 144.8 145.7 14 4._1_ 144.6 144.0 139.4 138.3 137.6 137.8 137.2 137.5 138.1 140.5 Turbine I/B Bearing Temp. ( F) 145.6 165.8 168.4 167.9 175.8 175.8 182.7 182.1 181.8 181.5 181.6 181.5 181.7 176.4 Turbine 0/B Bearing Temp. ( F) 159.4 185.0 186.3 185.4 184.6 184.5 191.3 191.0 190.7 190.4 190.0 189.2 189.2 184.6 Pump Room Temp. ( F) 90.5 98.2 99.7 98.7 99.3 100.0 98.7 98.5 98.3 98.4 98.3 97.5 99.4 99.4 Pump Room Relative ilumidity (%)

79 84 81 90 91 92 82 87 87 8 84 84 87 87 Pump Suction Flow (GPM) 185 175 175 175 180 180 540 540 540 540 540 540 575 268 Pump Suction Pressure (psi) 26 28 27 23

' ~ '2 2 23 23 24 25 27 26 26 25 26 Pump Discharge Pressure (psi) 1740 1620 1620 1640 1640 1640 1525 1325 1520 1525 1525 1525 1525 1625 Steam Generator Pressure (psi) 1060 1060 1050 1050 1050 1050 1050 1050 1050 1050 1050 1050 1050 1050 Table 1 AFW Turbine Pump 48-liour Run Data

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Table 2 Pump Run Times for Motor Driven Auxiliary Feedwater Pumps PUMP 1A 6/30/80 1310 to 7/3/80 2005 78 Hrs. 55 Mins.

7/13/80 2154 to 7/18/80 0650 104 Hrs. 56 Mins.

7/23/80 0232 to 7/25/80 1140 57 Hrs. 8 Mins.

8/1/80 1155 to 8/5/80 1409 98 Hrs. 14 Mins.

PUMP 1B 6/30/80 0607 to 7/3/80 2005 85 Hrs. 58 Mins.

7/13/80 2154 to 7/18/80 0650 104 Hrs. 56 Mins.

7/23/80 0232 to 7/25/80 1140 57 Hrs. 8 Mins.

8/1/80 1155 to 8/5/80 1409 98 Hrs, 14 Mins.

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