ML20009B233
| ML20009B233 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 07/10/1981 |
| From: | Leasburg R VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Clark R, Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.E.1.1, TASK-TM 414, NUDOCS 8107150123 | |
| Download: ML20009B233 (16) | |
Text
{{#Wiki_filter:. VINGINIA ELECTMIC AND PowzM COMPANY 0 , lis cit M OND, VIERGINI A 2 0 2 61 July 10, 1981 R. H. Laassetso Vace Fasesonar No u sam ossmarsome Mr. Harold R. Denton, Director Serial No. 414 Office of Nuclear Reactor Regulation N0/LEN:ms Attn: Mr. Robert A. Clark, Chief Docket No. 50-338 Operating Reactors Branch No. 3 License No. NPF-4 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Gentlemen: AUXILIARY FEEDWATER (AFW) PUMP ENDURANCE TEST RESULTS NORTH ANNA POWER STATION UNIT NO. 1 As requested by Mr. A. Schwencer's letter of December 14, 1979, we are forwarding the attached endurance test summaries of the steam turbine-driven and motor-driven AFW pumps at North Anna Unit 1. It should be noted that Vepco's response to NUREG 0737, Item II.E.1.1, " Additional Short-Term Recom-mendations", No. 3 is in error. This item etates that the North Anna Unit 1 motor-driven pump endurance test results have previously been submitted. This will be corrected in our next scheduled revision. If you have any questions or require additional information, please contact this office. Very truly yours,
' 'C cn R. H. Leasburg r
Vice President - Nuclear Operations Attachment g*
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o = l l NORTH ANNA POWER STATION UNIT 1 MOTOR DRIVEN AUXILIARY FEEDWATER PUMP ENDURANCE TEST I. DESCRIPTION OF TEST METHOD The purpose of this testing was to ensure that the motor driven , auxiliary feedwater pumps remained within design limits with respect to bearing / bearing oil temperatures, and that ambient pump room conditions (temperature, humidity) did not exceed environmental qualification limits for safety-related equipment in the room during the 48 hour endurance run. - Before testing began, the initll conditions below were verified:
- 1. Cooling water is available for the test flow loop, which includes a temporary heat exchanger t.onnected to chilled water via 1-CD-29 and 1-CD-36.
- 2. 110,000 gallon emergency condensate stoarge tank (1-CN-TK-1) is available for use with greater than 20% level indication.
- 3. Vibration and temperature measurement is available and in calibration.
- 4. All installed instrumentation is in calibration.
- 5. The instrumentation support tube for 1-PI-FW-156C and 1-PT-FW-103C has been temporarily moved to make room for j temporary piping.
Following verification of the initial conditions, the system was flushed. ; A terry turbine suction spool piece was connected at 1-FW-143 upon completion of system flushing. Pumps 1-FW-P-3A and 1-FW-P-3B were then i started and run for 48 hours. The emergency condensate storage tank l (ECST) temperature was maintained at < 120' F by directing the flow through the temporary heat exchanger. After a little more than 48 hours of continous operation, both pumps were secured. The pumps were allowed I to cool for 8 hours, and until pump bearing temperatures were within 20' F of their initial reading of the 48 hour run. The pumps were then res. tarted and run for one hour. Outboard and inboard pump tearing (surface) temperatures were recorded, as well as outboard and inboard ! motor bearing temperatures (comptuer points T2327A and T2326A respective-ly). Vertical and horizontal vibration displacements on the outboard and inboard bearings on both pumps were also recorded. Data was recorded at I hour intervals during the 48 hour run, and every fifteen minutes during the one hour run after cooling. l
II. The design operating capacity of the motor driven auxiliary pumps is 370 gpm, whir.h includes the required 350 gpm capacity plus minimum flow recirculation. The flow during the 48 hour testing was approximately 330 gpm. The operating head for both motor driven pumps is 1,216 psig. Pump
, head during the 48 hour testing ranged from 5.3% to 13.5% below design operating conditions for 1-FW-P-3A. For 1-FW-P-5B, head ranged from 0.4% to 6.1% below design operating conditions.
III. Pump bearing temperatures remained less than 160* F during the 48 hour run, and therefore met the acceptable criteria for the testing. IV. The safety related equipnt in the room is PCV-FW-159A and PCV-FW-159B (Category I Valves). The highest temperature recorded in the pumphouse during the 48 hour test was e~ J
- F. The design operating temperature for these valves is 100
- F, and therefore test conditions did not exceed the environmental qualification limit for the equipment used.
V. Vibration amplitude of the outboard and inbuard bearings of both motor driven auxiliary feedwater pumps remained below the maximum acceptable level of 1.0 mil. The largest amplitude recorded was 0.8 mil, detected in the vertical mode of the inboard bearing of 1-FW-P-3A. i I l l l i
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NORTH ANNA POWER STATION
SUMMARY
OF UNIT 1 TURBINE DRIVEN AtlXILIARY FEEDWATER PUMP ENDURANCE TEST I. DESCRIPTION OF TEST METHOD The purpose of this test was to ensure that the Unit 1 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 a 48 hour endurance run. To begin testing, the following initial conditions were verified:
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- 1. The 110,000 gallon Emergency Condensate Storage Tank (1-CN-TK-1) was available for use with greater than or equal to 98% level indication.
- 2. A sample of l-CN-TK-1 was taken and analyzed as satisfactory.
- 3. The Terry Turbine governor setting was verified
- 4. Vibration and temperature measurement instrumentation was available and in calibration.
- 5. The flash evaporator was available for use to supply makeup as necessary.
The normal lineup of the Auxiliary Feedwater System at North Anna Unit 1 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 steam generators. The motor driven auxiliary feedwater pumps were available for use as required. Total flow to the steam generators was required to be maintained above 250 gpm for the entire 48 hours of operation of the turbine drive auxiliary feedwater pump. Pump l-FW-P-2 was started and the required flow was established. Data was recorded at 15 minute intervals until stable conditions existed. After stable conditions were attained, data was recorded at 1 hour intervals. 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 bearings. The relative humidity and temperature of the auxiliary feedwater pumphouse were also recorded during the 48 hour test run. After 48 hours of continuous operation, pump 1-FW-P-2 was secured. The pump was then allowed to cool for 8 hours and until bearing temperatures were within 20 F of their initial readings.
6 The pump was then restarted and run for 1 hour. Data was recorded every 15 minutes and, at the end of the hour, the pump was secured. II. TEST CONDITIONS VS. DESIGN OPERATING CONDITIONS The minimum flow requirement of 250 gpm for pump 1-FW-P-2 was maintained throughout the test run and the pump head remained within the designed operating range of the pump. III. PLOTS OF BEARING / BEARING OIL TEMPERATURE VS. TIME FOR THE INBOARD AND OUTB0ARD BEARING 0F 1-FW-P-2 Pump 1-FW-P-2 is the only safety-related equipment in the pumphouse. Since the highest temperature recorded in the pumphouse was 101 F, which is below the design operating temperature of the turbine driven auxiliary feedwater pump, the ambient conditions did not exceed the environmental qualificatior limits during testing. Plots of bearing / bearing oil temperatures vs. time for the inboard and outboard bearings are attached. IV. PUMP VIBRATION The largest vibration amplitude recorded during the testing was 0.38 mils which was detected in the horizontal mode of the outboard bearing of 1-FW-P-2. Therefore, the turbine driven auxiliary feedwater pump bearing vibration did not exceed the maximum allowable amplitude of 1.5 mils during the endurance test.
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