ML19254E054
| ML19254E054 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 09/26/1979 |
| From: | Dunn C DUQUESNE LIGHT CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| TAC-7240, NUDOCS 7910310020 | |
| Download: ML19254E054 (12) | |
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,w, September 26, 1979 United States Nuclear Regulatory Commission At ten t. ion: Boyce H. Grier, Director Region I 631 Park Avenue King of Prussia, Pennsylvania 19406
Reference:
Beaver Valley Power Station, Unit No. 1 Docket No. 50-334 License No. DPR-66 Response To IE Bulletin 79-15 Gentlemen:
We have reviewed Bulletin No. 79-15.
A total of eleven (11) deep draft pumps are presently being utilized in safety-related applications at Beaver Valley Unit Nc. 1.
We are roviding the attached information for each pump as required by the Bulletin.
If you have any questions regarding this response, please contact my office.
Very truly yours, l ',
i U i j L.L. - -
C. N. Dunn Vice President, Operations Attachment cc: United States Nuclear Regulatory Comnission Office of Inspection and Enforcement Washington, DC 20555 United States Nuclear Regulatory Commission Division of Operating Reactors Attn:
A. Schwencer, Chief Operating Reactors Branch No. 1
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3 'l b Washington, DC 20555 7 910310 D D
DUQUESNE LIGHT COMPANY Beaver Valley Power Stat.on i
Unit No. 1 RESPONSE TO NRC IE BULLETIN 79-15 A.
Low Head Safety Injection Pumps [SI-P-1A, 1B]
Total number of pumps:
2 Manufacturer:
Ingersoll-Rand Model:
25APK; 2-stage Capacity:
3000 GPM at 255 ft.
Plant Application:
Provide emergency core cool Overall dimensions:
53.25 ft. (discharge cente bottom of suction bell)
Summary Of Startup Testing The flow capability of the low head safety injection pumps was demonstrated by operating each pump with suction from the Fefueling Water Storage Tank (RWST) under miniflow and under maximum flow hot and cold leg injaction conditions.
Pump response time was recorded along with pump flow and head data. The capability of the high head safety injection pumps to take suction from the low head safety injection pumps was also demonstrated.
Operational Testing The low h'ead safety injection pumps are verified operational once a month during plant operation by operating each pump for approximately 15 minutes on miniflow.
Special Testing A special test was performed to verify that the lA Low Head Safety Injection Pump [SI-P-1A] was capable of delivering full flow at the end of a thirty day cperating period.
The results of the test were previously forwarded to the NRC in a letter from C. N. Dunn to A. Schwencer dated July 26, 1978.
Routine Maintenance History - [SI-P-1A]
Completion Date Description Of Maintenance Action 2/19/77 Inspection 12/18/77 Installed temporary vibration equipment 12/29/77 Installed support spring can under pump discharge nozzle to prevent pump misalignment due to weight of nozzle 3/10/78 Removed pump, installed four accelerometers, reinstalled and realigned pump 3/22/78 Supported test crew ca mounting pickups for 30-day run test 4/17/78 Obtained tong ammeter readings 4/21/78 Installed steel coupling rings in place of brass coupling rings
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Beaver Valley Power Station, Unit No. 1 Docket No. 50-334 Response To NRC IE Bulletin 79-15 Page 2 A.
Low Head Safety Injection Pumps [SI-P-1A, 1B] (continued)
Routine Maintenance History - [SI-P-1A] (continued)
Completion Date Description Of Maintenance Action 5/13/78 Replaced damaged nipple on eductor piping 5/27/78 Decontaminated eductor piping 6/3/78 Weld-repaired pump discharge 6/11/78 Heated piping to bring within tolerance 6/26/78 Mounted accelerometers 7/6/78 nisassembled, inspected and overhauled pump and
-lumbed pump can 8/6/78 ligned motor-pump coupling Routine Maintenance Histcr_ - [SI-P-1B]
Completion Date Description Of Maintenance Action 2/19/77 Inspection 1/7/78 Installed spring can under pump discharge and aligned pump to satisfy NRC request due to high vibration on Surry's pumps 1/11/78 Installed temporary vibration equipment 6/15/78 Removed and inspected motor 6/24/78 Tightened swagelocks to eliminate pump shaft seal accumulator leak 6/28/78 Replaced coupling to resolve excessive vibration problem 7/6/78 Disassembled, inspected and overhauled pump and replumbed pump can Operational Problems Coupling-related misalignment problems and severe bearing wear.
Major Repair Efforts Both low head safety injection pumps were inspected and overhauled at the completion of a 30-day run test.
The original couplings were replaced with a spigot fit type coupling with close tolerances.
Chrome-placed shaft sleeves were installed on the pump shafts to provide a harder bearing surface and all pump bearings were replaced with modified tri-lobe bearings.
Both pump cans were restored to the vertical condition and the pump mounting flanges at the top of the can were machined horizontally level to achieve perpendicularity with the can centerline.
The alignment of the assembled pump columns were checked using optical alignment equipment and the column section flanges were machined to achieve acceptable alignment of all pump bearings.
2!
Beaver Valley Power Station, Unit No. 1 Docket No. 50-334 Response To NRC IE Bulletin 79-15 Page 3 A.
Low Head Safety Injection Pumps [SI-P-1A, 1B] (continued)
Major Repair Efforts (continued)
A cross tie has been installed to provide long-term backup capability far the low head safety injection pumps by supplying core cooling water from the sump using the outside recirculation spray pu ps.
The following modifications are expected to ce installed during the upcoming refueling outage:
1.
Replacement of the column sections with shorter sections of greater stiffness.
This modification will double the number of drive shaft guide bearings.
2.
Addition of a lower pump bearing.
3.
Replacement of the existing threated drive shaft couplings with snap-on type couplings.
4.
Installation of a stiffening wedge mechanism to provide intermediate bracing between tha pump columns and the pump can.
5.
Installation of a flow straightening vortex eliminator at the inlet piping connection of the pump can.
Longest Interval Of Pump Ooerability Without Corrective Maintenance The 1A Low Head Safety Injection Pump [SI-P-1A] was a"ailable for service for 404 days from 8/6/78 to 9/14/79.
During this time, the pump was run on recirculation for approximately fifteen minutes twelve times.
The IB Low Head Safety Injection Pump [SI-P-1B] was available for service for 447 days from 6/24/78 to 9/14/79.
During this time, the pump was run on recirculation for approximately fifteen minutes thirteen times.
Longest Continuous Ooeration The 1A Low Head Safety Injection Pump [SI-P-1A] was run on recirculation flow equivalent to approximately 5% of full flow for 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br />.
At the co :lusion of the test run, a short test at full flow (pumping into the depressurized Reactor Coolant System) was performed to demonstrate that the pump was still capable of delivering full flow at the end of the thirty-day operating period.
The IB Low Head Safety Injection Pump [SI-P-1B] has not been operated at full flow except during start-up testing.
]245 521
Beaver Valley Power Station, Unit No. 1 Docket No. 50-334 Response To NRC IE Bulletin 79-15 Page 4 B.
Outside Containmunt Recirculation Spray Pumps (RS-P-2A, 2B]
Total number of pumps:
2 Manufacturer:
Bingham-Willamette Co.
Madel:
10X18B-J-VCR; 2-stage Capacity:
3500 GPM at 251 ft.
Plant Applie.ation:
Containment depressurization and back-up for emergency core cooling Overall dimensions:
53.0 ft. (discharge centerline to bottom of suction bell)
Summarv Of Startuo Testing Startup testing was performed to verify proper pump operation and the absence of vortexing at the punp inlets at the containment sump.
With the pumps operating at 2000 GPM, pump performance data was obtained.
With the pumps operating at shutoff, pump perfor=ance and vibration data and motor running current data was obtained.
Operational Testing The outside recirculation spray pumps are started dry once per month during plant operation to verify starting ability.
Once per 18 months, the pump casings are filled and the pump run for 5 to 10 minutes.
Maintenance Hi *.ory - [RS-P-2A]
Completion Date Description Of thintenance Action 1/10/76 Tested, inspected and lubricated motor 6/2/76 Wiped up oil leaking from pump motor 9/9/76 Replaced plast!c caps with pipe plugs to fix upper bearing oil leak 1/9/77 Tested, inspected and lubricated motor 1/13/78 Tested, inspected and lubricated motor 4/25/78 Load-tested shaft handling tool 7/6/78 Disassembled, inspected and overhauled pump and replumbed pump can 2/14/79 Tested, inspected and lubricated motor 1?ab
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Beaver Valley Power Station, Unit No. 1 Docket No. 50-334 Response To NRC IE Bulletin 79-15 Page 5 B.
Outside Containment Recirculation Spray Pumps (RS-P-2A, 2B]
(continued)
Maintenance History - [RS-P-2B]
Completion Date Description Of Maintenance Action 2/22/76 Tested, inspected and lubricated motor 3/11/76 Reassembled incorrectly assembled mechanical seal 2/6/77 Tested, inspected and lubricated cocor 10/21/77 Installed fitting to accept tygon hose 3/28/78 Tested, inspected and lubricated motor 5/2/78 Load-tested eyebolts to lift pump 7/6/78 Disassembled, inspected and overhauled pump and replumbed pump can Operational Problems Bearing wear and shaft scoring.
Major Repair Efforts Both outside recirculation spray pumps were disassembled and inspected during an outage in the spring of 1978.
Moderate bearing wear and minor shaft scoring were observed.
Optical alignment checks of the assembled pump columns and the pump can were performed.
The pump column flanges were machined to obtain acceptable alignment of all pump column bearingt with the optical centerline.
The pump can was restored to vertical and the pump mounting flanges were machined. The pump shafts were chrome-plated to provide a harder bearing surface.
No further modifcations are considered necessary.
Longest Interval Of Pump Availability Without Corrective Maintenance The 2A Outside Recirculation Spray Pump [RS-P-2A] was available for service for 687 days from 6/2/76 to 4/20/78.
During this time, the pump was started dry thirty times and operated once with the casing filled for 5 to 10 minutes.
The 2B Outside Recirculation Spray Pump [RS-P-2B] was available for service for 589 days from 3/11/76 to 10/21/77.
During this time, the pump was started dry twenty-one times and operated with the casing filled once for 5 to 10 minutes.
Longest Period Of Continuous Operation Except for the original startup testing and the 5 to 10 minute runs to fulf).'.1 surveillance requirements, the pumps have not been operated continuously.
1243 323
Beaver Valley Power Station, Unit No. 1 Docket No. 50-334 Response To NRC IE Bulletin 79-15 Page 6 Inside Containment Recirculation Spray Pumps (RS-P-1A, 1B]
Total number of pumps:
2 Manufacturer:
Bingham-Willamette Co.
Model:
10X18B - VCR; 2-stage Capacity:
3500 GPM at 245 ft.
Plant Application:
Containment depressurizacion Overall dimensions:
15' 6 5/8" (discharge centerline to bottom of suction bell)
Summary Of Startuo Testing Proper pump operation was checked by operaciag the pumps at shutoff.
Pump performance and vibration data and cotor running current data were obtained.
T;.c pumps were also run in the recirculation mode but no flow data was obtained.
Operational Testing The inside recirculation pumps are started dry once per month during plant operation to verify starting ability.
Maintenance History - [RS-P-1A]
Completion Date Description Of Maintenance Action 12/22/75 Tested, inspected and lubricated motor 5/18/i3 Tested, inspected and lubricated motor 5/21/78 Removed deck plate 6/7/78 Removed screens for picture taking and reinstalled 8/9/79 Removed motor and sent out for modification of lower thrust bearing recommended by vendor because of possible generic defect Maintenance History - (RS-P-1B]
Completion Date Description Of Maintenance Action 1/5/76 Tested, inspected and lubricated motor 2/7/77 Tested, inspected and lubricated motor 5/18/78 Tested, inspected and lubricated motor 5/21/78 Removed deck plate 6/7/78 Removed screens for picture taking and reinstalled 7/29/79 Removed motor and sent out for modification of lower thrust bearing recommended by vendor because of possible generic defect 1243 324
Beaver Valley Power Station, Unit No. 1 Docket No. 50-334 Response To NRC IE Bulletin 79-15 Page 7 C.
Inside Containment Recirculation Spray Pumps (RS-P-1A, IB] (continued)
Operational Problems None Major Repair Efforts In June of 1979, the motors from both oumps were repaired and rebuilt by the General Electric Company to meet bearing changes incorporated in the motors used in the Surry and North Anna plants of VEPCO.
The changes included a change in the lower bearing, a new design lower slinger and clearance changes between the shaft and the lower shield.
Longest Interval Of Pump Availability Without Corrective Maintenance The 1A Inside Recirculation Spray Pump [RS-P-1A] was available for service for 1,134 days from 3/22/76 to 5/1/79.
During this time, the pump was started dry thirty-six times.
The 1B Inside Recirculation Spray Pump (RS-P-1B] was available for service for 1,148 days.
During this time, the pump was started dry thirty-eight times.
D.
Reactor Plant River Water Pumps [WR-P-1A, 1B, IC]
Total number of pumps:
3 Manufacturer:
Byron Jackson Pump Division of the Borg-Warner Corp.
Model:
28 KXH; single stage Capacity:
9000 GPM at 155 ft.
Plant Application:
Supplies cooling water to reactor plant related equipment Overall dimensions:
66' 11" (discharge centerline to bottom of suction bell)
Summary Of Startuo Testing Startup testing was performed to verify that the pumps are capable of supplying the required flow of river water.
Pump performance data was obtained at various flow rates including full flow.
Operational Testing Operability is verified by operating the pumps for approximately one-half hour at normal flow at least once a month when the plant is operating.
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Beaver Valley Power Station, Unit No. I Docket No. 50-334 Response To NRC IE Bulletin 79-15 Page 8 D.
Reactor Plant River Water Pumps [WR-P-1A, 1B, 1CJ (continued)
Maintenance History - [WR-P-LA]
Completion Date Description Of Maintentnce Action 4/11/76 Inspected motor and supply cable 9/8/76 Reinstalled incorrectly installed fittings 10/5/76 Rep.1. aced rubber expansion joint with one of higher rating 10/5/76 Lanced seal water lines 10/18/76 Replaced broken coupling 4/26/77 Inspected motor and supply cable 8/3/77 Cleaned lines 12/19/77 Cleaned seal water line and two valves 11/11/78 Inspected motor and supply cable Maintenance History - [RR-P-1B]
Completion Date Description Of Maintenance Action 4/10/76 Inspected motor and supply cable 4/21/76 Replaced mechanical seal; seal faces were worn and pitted, causing leakage 8/13/76 Flushed clogged motor cooling line 9/7/76 Repaired oil leak 10/5/76 Replaced rubber expansion joint with one of higher rating 10/5/76 Replaced broken shaft coupling between second end third shafts 10/10/76 Replaced broken shaft coupling - last coupling 11/18/76 Overhauled pump; couplings were broken 8/3/77 Cleaned lines Maintenance History - [WR-P-lC]
Completion Date Description Of Maintenance Action 4/11/76 Inspected motor and supply cable 8/13/76 Replaced expansion joint with one of higher rating 8/14/76 Cleared clogged seal water line 4/20/77 Inspected motor and supply cable 7/25/77 Overhauled shaft couplings, inner column bearings except for bottom and outer column bolts; polished and dressed shaft sections and threads; functionally tested.
12A3 326
Beaver Valley Power Station, Unit No. 1 Docket No. 50-334 Response To NRC IE Bulletin 79-15 Page 9 D.
Reactor Plant River Water Pumos [WR-P-1A, IB, IC] (continued)
Operational Problems Coupling failcres and plugged seal water lines.
Maior Repair Efforts All three reactor plant river water pumps have been overhauled and the couplings replaced.
Recently, the seal water lines were successfully cleaned with a chemical solution. Modifications are planned to replace the seal water lines with stainless steel piping to eliminate metal buildup on the inside of the presently installed carbon steel piping.
The 1A Pump impeller was recently replaced because of damage caused bf a foreign object entering the pump suction.
Repair work is presently being performed on the 1B Pump to repair the i=peller, lower shaf ts and bearings, a cracked spider assembly and to modify the impeller wearing surface and lower bearing housing.
Longest Interval Pump Availability Without Corrective Maintenance The 1A Reactor Plant River Water Pump [RR-P-1A] was available for service for 289 days from 10/18/76 to 8/3/77.
During this time, the pump was operated at near rated flow conditions thirty-one times for a total of 3,129.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />.
The following is a chronological list of the duration of each operating period:
283, 24, 88, 200, 44, 28.5, 5.5, 72, 144, 18, 60, 11, 92, 18.5, 297, 90, 16, 1.0, 2, 93, 341, 0.5, 1.0, 8, 251.5, 390, 11, 342, 24, 24 and 149 hours0.00172 days <br />0.0414 hours <br />2.463624e-4 weeks <br />5.66945e-5 months <br />.
The IB Reactor Plcnt River Water Pump [WR-P-1B] was available for service for 773 days from 8/3/77 to 9/14/79.
During this time, the pump was operated at near rated flow conditions sixty-three times for a total of 9,404 hours0.00468 days <br />0.112 hours <br />6.679894e-4 weeks <br />1.53722e-4 months <br />. The following is a chronological list of the duration of each operating period:
80, 506, 192, 40, 157, 259, 40, 12, 16, 120, 89, 1.5, 69, 161, 62.5, 430, 156.5, 1.5, 148.5, 92, 59, 5, 0.5, 1.0, 57.5, 88, 184.5, 180.5, 13.5, 75.5, 11.5, 263, 1.0, 477, 27.5, 23.5, 656, 5, 76.5, 472, 111, 34, 8.5, 599.5, 250.5, 256, 201, 181, 261, 1.0, 103, 189, 63, 514, 11.5, 642, 88, 11.5, 161, 236.5, 151, 12 and 6.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />.
The IC Reactor Plant River Water Pump [WR-P-lC] was available for service for 416 days from 7/25/77 to 9/14/79.
During this time, the pump was operated at near rated flow conditions forty-four times for a total of 5,051 hours5.902778e-4 days <br />0.0142 hours <br />8.43254e-5 weeks <br />1.94055e-5 months <br />. The following is a chronological list of the duration of each operating period:
38, 74, 0.5, 95.5, 0.5, 88, 40, 28, 120, 89, 334, 1.5, 124, 49.5, 45, 51, 5, 77, 160, 238, 19, 6, 159.5, 52, 7, 70, 259, 94, 62.5, 1.0, 13.5, 0.5, 0.5, 26.5, 0.5, 23.5, 512, 327, 886, 185.5, 2, 2, 74 and 609 hours0.00705 days <br />0.169 hours <br />0.00101 weeks <br />2.317245e-4 months <br />.
"d3 327 IL Loncest Continuous Operation The 1A, 1B and 1C pumps were operated continuously at near rated flow conditions for 390, 656 and 886 hours0.0103 days <br />0.246 hours <br />0.00146 weeks <br />3.37123e-4 months <br />,.respectively.
All three pumps were operable at the end of the runs.
Beaver Valley Power Station, Unit No. 1 Docket No. 50-334 Response To NRC IE Bulletin 79-15 Page 10 E.
Auxiliary River Water Pumps [WR-P-9A, 9B]
Total number of pumps:
2 Manufacturer:
Johnston Pump Company Model:
27CC - 18LS; 2-stage Capacity:
9000 GPM at 180 ft.
Plant Application:
Back-up supply of cooling water to reactor plant related equipment Overall dimensions:
61' 11" (centerline of discharge to bottom of suction bell)
Summarv Of Startup Testing Pump performance data was obtained with the pumps operating at seven different flow conditions including full flow and shutoff.
Operational Testing The pumps are operated monthly during plant operation at near rated flow for approximately 1/2 hour to verify operability.
Once per eigateen months, the pumps are operated for approximately 2 1/2 hours.
Maintenance History - [WR-P-9A)
Completion Date Description Of Maintenance Action 2/3/77 Cleaned pump seal water sight glass 2/4/77 Disassembled pump, cleaned parts, thawed ice on inner column and reassembled pump Maintenance History - [WR-P-9B]
Completic1 Date Description Of Maintenance Action 2/16/77 Replaced packing Operational Problems None Major Repair Efforts
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None
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Beaver Valley Power Station, Unit No. 1 Docket No. 50-334 Response To NRC IE Bulletin 79-15 Page 11 E.
Auxiliary River Water Pumps (WR-P-9A, 9B] (continued)
Longest Interval Of Pump Availability Without Corrective Maintenance The 9A Auxiliary River Water Pu=p [WR-P-9A] has been available for service for 954 days from 2/4/77 to 9/14/79 and is still operable.
During this period, the pump was operated at near rated flow conditions for approximately 1/2 hour thirty times and for approximately 2 1/2 hours once.
The 9B Auxiliary River Water Pump (WR-P-9B] has been available for service for 942 days from 2/16/77 to 9/14/79 and is still operable. Dering this period, the pump was operated at near rated flow conditions for approximately 1/2 hour twenty-eight times and for approximately 2 1/2 hours once.
Longest Continuous Operation Both pumps were operated at near rated flow conditions for approximately 2 1/2 hours to fuifill the 18-month surveillance requirement.
Both pumps were operable at the end of the runs.
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