Text

Summary of Unit 2 Turbine Driven Auxiliary Feedwater Pump Endurance Test
	ML19339B939
Person / Time
Site:	North Anna
Issue date:	11/07/1980
From:	; Virginia Power (Virginia Electric & Power Co)
To:	;
Shared Package
ML19339B937	List: ML19339B936; ML19339B939;
References
	NUDOCS 8011100467
	Download: ML19339B939 (5)
	v • d • e

_

9 IKRm ANNA POWER STATION SUPMARY OF UNIT 2 TURBINE DRIVEN AUXILIARY FEEDWATER PUMP ENDURANCE TEST I.

DESCRIPTION OF TEST METHOD The purpose of this testing was to ensure that the Unit 2 Turbine Driven Auxiliary Feedwater Pump remained within design limits with respect to bearing / bearing oil temperatures and vibration, and that the ambient pump room conditions (temperature, humidity) do not exceed environmental qualification limits for safety-related equipment during the 48 hour5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months endurance run.

To begin testing, the following initial conditions were verified:

Initial Canditions 1.

110,000 gallon Emergency Condensate Storage Tank (2-CN-TK-1) is available for use with greater than 95% level indication.

2.

Verify governor valve setting is 3.8.

3.

Vibration and temperature measurement instrumentation is available and in calibration.

4.

A sample of 2-CN-TK-2 is taken, and analyzed as satisfactory.

The normal lineup of the Auxiliary Feedwater System at North Anna Unit 2 consists of two motor driven pumps and one steam driven auxiliary feedwater pump, each providing auxiliary feedwater to one of the three steam generators.

For this endurance test, the turbine driven pump was aligned to all three of the steam generators, with the motor driven auxiliary feedwater pumps available for use as required. Total flow to the steam generators was required to be maintained above 250 gpm minimum for the entire 48 hour5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months operation of the turbine driven auxiliary feedwater pump.

Pump 2-FW-P-2 was started and the required flow was established. Data was initially recorded at 15 minute intervals, but was increased to 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months intervals once stable conditions existed. Bearing surface and bearing oil temperatures were measured at the inboard and outboard bearings of the turbine drive pump. Vertical and horizontal vibration displacements were also measured at these bearing. The relative humidity and temperature of the auxiliary feedwater pumphouse were also recorded during the 48 hour5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months test run.

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After 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months of continuous operation, pump 2-FW-P-2 was secured.

The pump was then allowed to cool for 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months and until bearing temper-atures were within 20* F of their initial readings.

1 The pump was then restarted and run for 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months , with date taken every 15 minutes, and then secured.

II. TEST CONDITIONS VS. DESIGN OPERATING CONDITIONS The minimum flow requirement for the turbine driven auxiliary feedwater pump is 250 gpm; its capacity plus minimum flow recirculation is 735 gpm.

During the 48 hour5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months endurance run, pump flow ranged from 573 gpm to 329 gpm.

Pump head for 2-FW-P-2 during testing ranged from 12.93% to 6.82%

above the design operating point of 2800 feet and remained within the design operating range of the pump.

The nonnal operating steam inlet temperature for the turbine is 550 F.

During testing, the steam temperature ranged from 526 F to 539' F.

III.

PLOTS OF BEARING / BEARING OIL TEMPERATURE VS. TIME FOR THE INBOARD AND OUTBOARD BEARING 0F 2-FW-P-2 Pump 2-FW-P-2 is the only safety-related equipment in the pumphouse.

Since the highest temperature recorded in the pumphouse was 10l* F, which is below the design operating temperature of the turbine driven auxiliary feedwater pump, the ambient conditions did not exceed the enviornmental qualification limits during testing.

V.

PUMP VIBRATION The largest vibration amplitude recorded during the testing was.12 mil. and was detected in the vertical mode of the outboard bearing of 2-FW-P-2.

Therefore, the turbine driven auxiliary feedwater pump bearing vibration did not exceed the allowable limit during test of 5,1.5 mils.

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