ML19331E234
| ML19331E234 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 09/04/1980 |
| From: | Carey J, Ireland R, Sieber J DUQUESNE LIGHT CO. |
| To: | |
| Shared Package | |
| ML19331E231 | List: |
| References | |
| NUDOCS 8009090412 | |
| Download: ML19331E234 (4) | |
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- DUQUESNE LIGHT COMPANY -
Power Stations Department-Beaver Valley Power Station, Unit No. 1
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Report Low Head Safety Injection Pumps Presently installed at Beaver Valley Power Station, Unit No. 1 Submitted by:
- _J R. N. Ireland Reviewed by:
M M>/
[/ J. D. Sieber Approved by:
WAA 0.S.
9 4 p J. Car,ep Date: August 27, 1980 A
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. DUQUESNE. LIGHT COMPANY Power Stations Department Beaver; Valley Power Station,-Unit No. 1-Report-
. Low Head-Safety Injection Pumps
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Introduction.
- The' two Low Head Safety, Injection pumps (LHSI) located in the west i.
-safeguards area are vertical,' dual stage pumps manufactured by"Ingersoll Rand Company.- Each pump is driven by a vertical-shaft, 250 hp, 4160. volt
- A.C. electric' motor.- After' extensive tests of the hydraulic characteris-
' tics of the-LHSI pump configuration by the LaSalle Hydraulic Laboratory, Study'll700-2.29-18A', modifications.co'the'LHSI pumps at BVPS-1 were deemed necessary..
The LHSI pumpsLas presently installed at BVPS-1 are essentially identical to the North Anna Power Station LHSI pumps and incorporate all features determined by tests to be desirable for reliable i
1 operation.
Our purchase requisition to Ingersoll Rand specified that, I
"These replacement pumps'are.to be provided with all the-design details of those which have been. qualification tested at the North Anna Power
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Station and will.have the-same number and type of bearings, column sections and shaft couplings."
II.-
Summary of Modifications to the LHSI Pumps' 4
rm he cti n 1
o the botto ep p c n and the suction bell. This eliminates the impacting of the suction flow on the side ~of the pump discharge column.
B.
A " Vortex Eliminator" was installed as a false bottom plate approxi-mately 2 inches from the bottom'of the pump can and was designed to eltninate vortexing at the pump ' suction.
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C.-
Three sets of " Wedge Locking Assemblies" were installed.
The three wedges'in each assembly are situated radially 120 degrees apart with respect to the~ pump centerline (shaftfcenterline) at each of three elevations for a total of 9' assemblies..The wedges are designed to
. lock'the: discharge column in position following final assembly. ~The
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wedges are not used for the purpose of alignment. 'In the locked
' position, the assembly positions the pump' discharge column in'a fixed
' position inside the pump can.
D.;
sThe following partsJfrom the original pumps were modified and re-used.
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- 1.. -SuetionLBell-- the outside diameter was reduced to permit
! installation ~through the " Turbulence Limiter" and the flow vanes were eliminated.
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2.
EFirst' Stage Casing -ithe. addition of a new 5 inch bearing.
Machining 1was done to_ permit installation of a new style of-2
- a13.~5: inch bearing.
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- o-Report' Low Head Safety Injection Pumps II. -
Summary of Modification to the LHSI Pumps (continued) 3.
Second Stage Casing - support' lugs were removed and machining was done to accommodate a new 3.5 inch bearing.
4.
First Stage Impeller - the outside wall was ground to a new radius and the hub was. bored out to permit installation on a new shaft..
5.
Second Stage Impeller - the hub was bored out to permit installa-tion on a new shaft.
6.
Discharge Head - the mounting plate and the mid-plate were drilled to accommodate the " Wedge Assemblies" and a new bearing was installed.
E.
,The following summarizes the new parts and arrangements:
1.
Bearings -- a total of 13 bearings are installed in each pump.
They are Nickel impregnated Graphalloy, tri-lobe bearings
-(10 @ 3 inch; 2 @ 3.5 inch; 1 @ 5 inch) (Required bearing clearance is now.003"
.010"; the clearance prior to modifi-
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cation was.005"
.014").
These bearings are identical in design to those which have been successfully tested at the North-Anna "ower Station.
i 2.
Couplings precision couplings which are identical to that which is installed on the pumps at North Anna has been installed.
3.
Pump Columns - New pump column sections with stiffeners have been installed.
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All other pump parts including shaft sections, shaft couplings, journal sleeves, bearings, precision drive coupling and column sections.have been replaced with new parts which duplicate the design features of those parts-which have been successfully tested at the North ~AnnaLPower Station.
.III.
Pump Overhaul The procedure used for the pump overhaul was BVPP No. 89-1 which is a' revised: edition of Duquesne Light Company's Corrective Maintenance 1
- Procedure "1A or 1B Low Head Safety Injection - Pump Overhaul" (1-11SI-P-1A-B-lM, Revision 6). : The procedure was revised to account for the changes made to
'l the LHSI pumps by Ingersoll Rand under Duquesne Light Company P.O. No. C-007039
- and for the addition of the turbulence limiter.
ThelIngersoll Rand-Company performed an optical alignment of the pumps i
which included: match marking of the pump column sections. Match marking of
.l the pump column' sections. assured that the pump is properly aligned.
The
. drive motor has been aligned to within~.002 inches for both concentricity land parallelism.
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Report Low Head Safety Injection Pumps IV.
Design Verification-After pump modifications were complete, each pump was tested to verify that the pumps operated as designed.
The pump was operated on' recirculation flow for six hours.
Each pump was then stopped and started 12 times to simulate a full year of periodic testing. 'The "B" pump was then disassembled'and. bearing measurements were taken to record the bearing wear. The maximum wear of 1.5 mils occurred in the'"L" bearing. Wear in all.other bearings was 1.0 mil or less.
The "L" bearing is the upper-most bearing located in the discharge head and experienced maximum wear due to 11ts lack of' lubrication during startup until the pump approaches operating speed. After inspection, the pump was reassembled and run for 30 minutes.
The results of this bearing inspection verified that the assembly procedure was properly performed. Vibration readings taken periodically during the' six hour run on the motors of the pumps were less than 1 mil for the "A" pump and 2 mils for'the "B" pump. 'There was no indication of increased vibration as the test progressed.
i V.
_fonclusion The. testing and inspections which have been performed successfully demonstrated that the Low Head Safety-Injection Pumps at Beaver Valley Pover Station have been properly designed and installed to assure
. reliable llong term operation.
Identical pumps have been qualification tested at the North Anna Power Station of the Virginia Electric Power Company.
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