ML20141F699
| ML20141F699 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 03/06/1997 |
| From: | INGERSOLL-RAND CO. |
| To: | |
| Shared Package | |
| ML19355F179 | List: |
| References | |
| QCM-578, NUDOCS 9705210428 | |
| Download: ML20141F699 (23) | |
Text
. _ _ __ _ .. __ _ _ __
1 QCM 578 Rev. 5
..- DATE: 24 FE 93 CY .
U REVISION CONTROL & STATUS SIIEET MANUFACTURING AND QUALITY CONTROL PLAN CQCM 11 - 470 :
IDP ORDER NO.: 050 61994 PUMPTYPE: 811N-194 CUSTOMER: F.P. CORP PUMP MARK NO's: 1624922 CUSTOMER ORDER NO.: F772618D PLAN REV. PAGE DATE DESCRIPTION APPROVED ,
NO. NO. NO.
, 470-1 0 9/25/96 Receive, Dismantle, Inspect Pump l
470-2 0 9/25/96 Pump Assembly 1 0 470 3 0 9/25/96 Pump Testing 470-4 0 9/25/96 Dismantle, Inspect Pump- After Test 470-5 0 9/25/96 Pump Re-Assembly 470-6 0 9/25/96 Shipment DRGINAL ISSUE APPROVAL
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FLORIDA POWER CORP - CRYSTAL RIVER 8HN - 194 DECAY HEAT PUMP INSPECTION
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INGERSOLLiiAND, Engmeered rump Diwsten PUMPS lagerscitenc ceme:ny QCM 6 5 5 REV* * !
Phmicscurg, NJ C6&C I DATE: 27 NOV. 84
- INSPECTION RECORD SINGi.E STAGE i i
PUMP [KSP.C PGR, \q q l Q' j)
CUSTOMER FLos da i ous a S AssEMBtr ;Os NO. v; o s a. y r 3 l ORDE?.0$$* hl% Q ! TEM Ol ,
PUMP TYPE WHN pte s /n usT NO. l GA DWG l IMPELLER DWC. MATL.
IMPELLER DIA. l88Q ROTATION C,C. W 5 Cf. RM i30 9 S5 I GPM ' HEAD . RP M EFF SG TEMP LIQUID RUN l DIA CLR CUT! CHECX LIST CLEARANCE DATA CA5:bG RING !.D. lO 145 I i1l IMPELLER DYNAMIC BALANCE IMPELLER RINC. FRONT O.D. 10 '720 : & J 5 I u/1 1 2 i ROTOR DYNAMIC BALANCE EXTN/BRKT RING !.D. Q , 7Q3 l t 13l B/M AND ORDER PAGES SPECIAL IMPELLER RING-BACX O.D. 4 . 7 1 9 j Q A Ll l #f/A I 4 l P AINT: STD 1 l!l NOZZLE LOCATION: SUC DSG l CA31NG BUSHING 1.D. U-LINE) l l l6i INSPECTED AFTER TEST l SHAFT SLiEVE O.D. U-LINE) l l l l
EXTN/BRXT EUSHING 1.D. l l l 17i TYPE BEARING 5 l l 8 l P AC"CNG: STD SPEC l SH AFT SLEEYE O.D. l l I9l TYPE 1EAL MANUF l P!PtNG CHECX LIST l
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MATL CONN size I11 i SHIPMENT PREIERVATION
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iy l COUPLING GUARD MATL l CODE '
t 16 i COUPLING TYPE l' JMwF ) DATA DESIGN INSUL i 17 i O RITICE 5/N FRAME I 13 i DOWELLING HP 1 RPM l l
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DRIVER COUPUNG ALIGUED ABOVE PUMP CPLO i SHAFT: BEFORE TEST 0.D. PACE l DRIVER CCUPLING AUCNED BELOW PUMP C?LG PUMP HALF.COUPUNG:
i DRIVER HALF.CPLG: 0.D. FACE CGMPRE!5 ION OF MAIN GASKET SP ACER O.D. ROTCR THERMOCOUPLE: TY7E S/N
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APPROVAL: TITLE. DA'TE:
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, legerse5 Dresser Pump Company 1:aglacered rump croup l
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December 4,1996 Mr. William P. McSorley GPU Nuclear TMI Generating Station P.O. Box.480 Middletown, PA 17057 ,
RE:8HN-194 Decay Heat Removal Pump
Dear Mr. McSorley:
Per our conversation IDP has determined that the stationary wear rings (casing and stuffing box) :
of the spare pump currently in-Phillipsburg are !
undersi' zed. According to our records the as new impeller design clearance should be .030" to .035" as opposed to a measured value of .025". l I have discussed this issue with IDP's engineering e department and they advise that the larger clearance
(' is required to reduce the possibility of galling these 316SS materials during a thermal transient.
Therefore we request your approval to bore these rings ;
to achieve a clearance of .030" to satisfy this concern.
1 At the same time IDP will restore the casing pilot fit J
of the stuffing box which we have previously identified as also being undersized. ,
IDP certifies that these changes will not affect the pump's performance. IDP offers to run a performance test at no cost to GPU if required.
, We thank GPU for your assistance in this matter and look forward to your responsa i
- i Very truly yours, 1
Michael Dozier h1 Project Manager ,
cc:J Heebner R Koch (b . ;
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ingersell-Rend Puific Werthington Ploeger hieme Jeemeat-kbeelder Peeps
03/BryVV BU UV U 847 967 2946 P.01 Joh] CrZne in3 gh North America Engineered Sealing Systems l
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( ) 6400 West Oakton Street March 12, 1997 Morton Grove IL 60053 USA Telephone: 847 967 2400 Facsimile: 647 967 2857 Ingersoll-Dresser Pump Company Engineered Pump Division 942 Memorial Parkway Phillipsburg, NJ 08865
Subject:
Evaluation of a John Crane 2.875" dia T 1B ccal ocr drawing CF-SP-78157 ~
Dear Mike,
This is a follow up to my letter dated January 15 regarding the subject seal.
I have completed a detailed inspection of the subject seal that was retroved from the 'IMI-1 spare Decay Heat Removal Pump following the low flow endurance testing, conducted at your facilities. Based on the seal performance during the test and my
,NJ personal' inspection / evaluation of the seal, it is my belief that
~
the seal will perform satisfactorily for 1 year with the Decay Heat Pump operating at the minimum recirculation flow condition.
I checited the flatness of the seal faces on the returned and found, that they were just slightly out of tolerance. parts On the sealing faces slight circumferential grooving was visible due to abrasive in the water on the test stand.
I had the seal faces of the primar ring and mating ring relapped and both seal faces are like new. yI did not replace any parts or disassembled the seal head from the sleeve due to the fact, that the seal performed satisfactorily during the test. Only the primary ring was removed from the retainer and the mating ring from the gland late, inspected and reworked. I expect, the seal includin rce rk. g the e astomers will perform satisfactori.Ly after this If you have any questions, please call me at (847)967-3728.
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-INGERSOLL-RAND COMPANY ~- ENGINEERED PUMP DIVISION
-STEPPED' PERFORMANCE TEST RECORD _PAGE 1
-(+-vuo*********************************************************************************
) DATE 2 /4 /97 13 237 f j
i POINT-N L1 l2' 3' 4 5 6 7 f
DISCHG (FT) 439.3 439.2 432.2 402.5 350.1 309.1 285.9 ,
i SUCTION (FT)- 18.5 18.5 18.0 16.0 ~ 14.8 10.5 8.6 i
DIFF. VEL.HD. 0.0 0.0 0.3- 1.4 3.0 4.1 4.7 T.D.H.(FT) 420.8 420.7 414.5 '388.0- 338.3 302.7 282.0 FLOW (GPM) 0.0 176.6 925.7 1923.1 2788.3 3271.8 3513.1 ;
.U.H,P. 0.0 18.2 96.9 188.2 237.9 249.3 249.9 ,
R. P. h. <
1792. 1792. 1792. 1792. 1792. 1792. -1792.
WATTS' 113.3 -117.3 146.8 199.9 238.8 258.6 267.0 .j 3.H.P. 141.7 146.9 135.3 254.4 304.4 329.7 340.2 !
EFFICIENCY 0.0 12.S 52.3 74.0 78.2 75.8 73.4 s
4mDATA STEPPED TO SPEED OF 1780 R' M.
STEP TLH 415.2 415.1 439.0 382.8 333.8 298.6 278.2 STEP FLOW 0.0 175.6 920.5 1910.2 2769.7 3249.9 34B?.E ST2P APM 1780. 1780. 1760. 1780. 1780. 1760. 1780.
i STEP BHP 138.8 144.0 181.6 24?.3 298.3 323.1 333.5 i STEP EFF 0.0 13.6 51.3 74.0 78.2 75.8 73.4 .
i
===============n================3=========s=============================
CRDER H-ITEM CUSTOMER CUST. ORDER CUST. TAG /ITM 200-11994.20 TLCRI:; POWZ7 C:Rf.
PUMP TYPE SERIAL NO. IMPILLER IMPELLER DIA CUST. RPM BHH-194 1624922 0.00 1780.
========================================================================
4mGUARANTEED CONDITIONS:
GUAR. GPM GUAR. TDH- GUAR. EFF. GUAR. NPSHR GUAR. MCSF ;
3000.0 350.0 79.0 14.0- 1000. !
========================================================================
4mCUSTOMER CONDITIONS:
CUST. TEMP. C.VISC.(SSU) CUST. SP.GR.
['"'\.
.d 1CUST. SERVICE 0.0- 0.00 CUST. NPSHA 0.0
=========================================================== ==========
l APPROVALS:.. -
TEST ENGR. $$ikEE) ENGR'G.. DEPT.
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_= _.
.I INGERSOLL-RAND. COMPANY-i . ENGINEERED PUMP DIVISIDH STEPPED PERFORMANCE TEST RECORD 'PAGE 1 1 1 DATE 2 /4-/97 J1~'-eme**************.********************************************
A) 14':4-
- 1 4
POINT H 1:
DISCHG (FT)~ ' 437.4 l 1
SUCTION (IFT) 116.5 l DIFF. VEL.HD. O.O. ;
-T.D.H.(FT) . -
420.9 ,
.-?
' FLOW (GPM). 125.6 ,
t U H.P.; . 13.33 ;
R.P.M. 1792.. ;
-i WATTS -116.4. !
i B. H. P. ; '145.8- l t
EFFICIENCY , 9.1 ;
1 l
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4ALATA 2TE??ED TC EGEIC CF 1730 RFM.
LSTEP TDH 415.3 124.7 !
STEP FLOW:
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STEP RPM 1780. '
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-STEP PHP 142.9 STEP EFF 9.1
.===========n======u=================================================================
ORDER H-ITEM- CUSTOMER CUST. CRLER CU3T. TAG /ITM 050-61c?4.00 FLORID 4 POWER CCRP.
PUMP TYPE SERIAL NO. IMPELLER IMPELLER DIA CUST. RPM 8HN-194 1624922 0.00 1780.
========================================================================
4mGUARANTEED CONDITIONS:
GUAR. GPM' GUAR. TDH GUAR. EFF. GUAR. NPSHR GUAR. MCSF
- 3000.0- -350.0 79.0 14.0 1000.
, ====================================================================================
' ' 4mCUSTOMER CONDITI0hS:
_[ .CUST. SERVICE. CUST.' TEMP. . C.VIIC.(SSU)' CUST. EP.GR. CUST. NPSHA
~\
0.0 0.00 0.0 a======================= ===========================================================
APPROVALS:. I' TEST ENGR.- b~ ENGR'G. DEPT.
l-
ENGINEERED PUMP DIVISION INGERSOLL-RAND COMPANY VIBRATION DATA
()
P EST POINT NUMBER i
j TOTAL HEAD - FT.
TOTAL GN )g{ 976 lg73 g7gg 7g yj 3gj3 UNFILTERED DISP. (MILS) O 7 .Ob .08 ~
% rn.mED-MAX <
h VELOCITY (IN/S) .O3 . 0 2- *df t 0 2- ' O S- 6 2.,
e .
g gy ,I$ .lC ,01 06 s olo 01 \
E uNFn.mED -
~7 5 DISP. (MILS) .$b - e30 i3b 29 > 3. Y a .
$ UNFILTERED
>09 l
.o8 .66
- vELOCrrt (tN/S) ,I8 'If <c7 y Fn.TERED-MAX VELOCJTY (IN/S) .UI iOf 'O iO b 'O} +O) gg ,14- il l .08 , o 6, .07 o8 UNFILTr. RED DISP. (hES) )
UNFILTERED E VELOCITY (IN/S) t-5 FILTERED MAX
{g VELOCITY (IN/S)
E '
E UNFILTERED C .J DISP. (h0LS) !
$ UNFILTERED C VELOCITY (IN/S) a y FILTERED MAX l VELOCITY (IN/S) ,
N.Y.O. ITEM S/N PUMP TYPE DATE o so - 6 / f 94. o o /624 922 s#)-/fp 2N/97 GPM TDH RPM 2000 3 50 1760 1
- +
- Ingersell Dresser P.:mp C:mpely Engineered Pump Croup 942 Memorial Parkway Phillip burg. N 08uG
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September 25,1996 Mr. Philip Saltsman i
Florida Power Corp
.15760 Power Line St Crystal River, FL 34428 RE:IDP 8HN-194 Decay Heat Pump Review of Minimum Flow Requirements
Dear Mr. Salesman:
In response to your September 20 message please be advised that your scenario # 1 (100 GPM/100 deg F) would be the .
more severe duty for the subject pump.
r3
-(j - The colder water would be denser (higher specific gravity) and transmit .more energy to the pump components. .
The lower flow condition (100 GPM) would be even further from the original pump design of 5,000 GPM. The further from BEP the pump runs the more unstable the flow will become, transmitting additional radial and axial loads to the rotor.
If you have any questions regarding the above please let us know.
I Very truly ycurs, l Manish Patel Nuclear Design Engineering l j
cc:R Koch
)
I h '
i lagersell Read Pacifle .Worthington Meeger $41 ento Jeement Schneider Pumps 4
j
Ingersoll Dresser Pump Company Engineered Pump Crorp 942 Wm.wial Park av Phillip lavg. N 08363 G'
D October 3,1996 Mr. Philip Saltsman Florida Power Corp 15760 Power Line St Crystal River, FL 34428 ,
RE:8HN-194 Decay Heat Pump Test FPC P.O. F772551B
Dear Mr. Saltsman:
Attached is IDP's Performance Test Instructions (PTI) '
for.the subject activity. Please review and advise any questions or comments ASAP.
Regarding some of the test parameters specified by FPC we have.the following comments:
Flow is measured in the test loop involved by a venturi
'
(See PTI Section 5.0) .
z fG This is acceptable as the specific NPSHA does not V affect pump operational characteristics so long as the minimum NPSHR is always satisfied.
That is the case with the subject test.
If you have any questions regarding this issue please advise.
fj A ._
Paul Kasztejna T
- Design Engineer b !
cc:M Dozier
,, ,) .
t q)
Ingersoll Rand - Pedfic - Worthington Mewger Sciento Jemmont 5<bneider Pumps
12;::::I Otelset PWImp CORBpeRy W"M P"8"PGr*"P N2 WmorW Parkway MdH;pivry N 0865 O -
d
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May 7,1997 Mr. Philip Saltaman Florida Power Corp 15760 Power Line St Crystal River, FL 34428 RE:FPC P.O. # F772610D 8HN Decay Heat Pump Test
Dear Mr. Saltsman:
Confirming our conversation IDP did : performance test the 8HN after IDP restored the stuffing box fit and ring fits to original design. This test was held on 2/4/97 and the results can be found in the reference section of the report.
The data / curve showed no measurable difference compared to the testing done prior to the fit restoration, therefore
- the pump was released and returned to TMI.
If you have any further questions regarding the above please let us know. )
Very truly yours, Michael Dozier k ai Project Manager i i
I l
O Q) i legerseHead Ped & worthingten S eger sdeme JeemeeHdmelder Pseps A
--~ - -- -
Florida INTEROFFICE CORREGPONDENCE Powcr Nuclear Plant Technical Suppod . NAll 240 3390 MUEMWE D @'
wrim MC cmM*Mim susJEct: Specifications for Decay Heat Pump Low Mow Testing DATE: September 30,1996 ;
To: J. H. Terry l NPTS96-0506 Ref: 1) MPR-1134
- Evaluation of Crystal River Unit 3 Decay-Heat Pumps at Low-Flow Operation," MPR Associates, Inc., dated June 1989.
- 2) NED96-0550 " Design Requirements for Decay Heat Pump Irw Flow Test," dated September 30,1996.
The objective of this IOC is to define test specifications for the low flow endurance test of TMI-l's spare Decay Heat Pump (DHP) at Ingersoll-Dresser Pump Company's (IDP)
Phillipsburg, N. J. test loop. This test is currently scheduled to commence on October 7, 1996. Specifications address IDP and FPC responsibilities 'vith regard to the following eight major milestones:
- 1. Pre-test teardown and inspection of TVI ' spare DHP.
A. IDP Responsibilities: l
- Utilize MPR post test inspection report from 1989 testing conducted at CR 3 site (Enclosure 2 of MPR to FPC letter dated
- April 12,1989) as a minimum scope; inspection beyond the minimum scope is at IDP's discretion.
Document inspection results and provide to FPC for review and
/-
approval.
1 B. FPC Responsibilities: !
- Review and approve all inspection documentation; provide l comments to IDP as needed and facilitate resolution of comments. l
- Nodfy IDP to proceed with pump reassembly upon fmal approval {
of pre-test inspection results.
l j
NPTS964506 l
" Page 2 of 5
- 2. Reassembly of spare DHP and installation into IDP test loop.
A. IDP Responsibilities:
- Reassemble spare DHP to restore the pump to design )
i specifications; IDP is the vendor of record for the Worthington Model 8HN-194, horizontal, single-stage centrifugal pump and as ;
l F such has ownership of all required documentation to accomplish j pump reassembly and is fully qualified to perform all necessary ?
work activities.
- Install reassembled pump into test loop and setup the pump for
+
initial performance testing; the test configuration shall include all instrumentation required for monitoring pump performance, pump . ,
flow, bearing temperature, and provisions for cooling water; IDP :
to supply pump driver, coupling, all flanges, piping, and mounting hardware.
4
- Prior to the initial running of the pump, ensure the following: 1) pump bearing is properly lubricated; 2) pump shaft turns easily i and there are no obstructions in the suction or discharge; 3) l pump and driver are aligned to exhibit. offset < 3 mils and ;
- angularity < 3 mils; 4) adequate NPSH is provided; 5) water l i
used for seal (John Crane Type IB) flushing shall be clean and l
j ( typical of city water or potable well water and water used for l pump testing should meet the same requirements; and 6) test instrumentation functions and is calibrated to better than 25 ,
- accuracy.
- Test motor shall be sized and operated so that it does not over i
- torque the pump shaft.
B. FPC Responsibilities:
- Provide and install instrumentation for monitoring vibration j parameters.
i - Walkdown and inspect the 2st setup prior to initiation of any I testing.
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'NPTS960506 Sage 3 of 5 i.
- 3. Baseline performance testing of spare DHP. .
A. IDP F*=naneihilities: '
- Verify the head curve for TMI-l's spare DHP, Worthington Model 8HN-194; collect data for thermal driving head, BHP, efficiency, '
and speed at approximately 125 gym,925gpm,1900 gpm,2800
- gpm, 3250 gpm, and 3500 gpm (additional flow versus head data may be obtained at vendor's discretion); data will be compared to previous performance testing results obtained by IDP during testing conducted on this same pump in 1995.
/- Document performance test results for FPC review and approval. '
- Allow test loop to cool to ambient temperature and setup loop for 100 gpm flow prior to proceeding with endurance testing.
B. FPC Responsibilities:
- Witness performance test and monitor vibration parameters.
- Evaluate performance test data against previous testing results for TMI's spare DHP as well as the certified vendor curves for CR-3's Decay Heat Pumps.
- Resolve comments / discrepancies, if any exist, prior to prneceding with endurance testing.
( Endurance testing of spare DHP at low flow conditions, not to exceed 14 days.
4.
A. IDP Responsibilities:
- Perform low flow endurance testing of TMI-1 spare DHP per the requirements of NED96-0550.
- Notify FPC imdi*1y if noticeable negative trends in pump performance and/or vibration parameters are observed during the conduct of the endurance test.
B. FPC Responsibilities:
3 4
- Witness initial two days and final two days of testing at a
' minimum (i.e. if no significant problems develop during testing l
which could require termination of the test).
j - Obtain vibration data and provide onsite support at IDP test loop !
as needed during the conduct of the endurance test. )
4 - Provide final approval for termination of testing prior to equipment
- b being secured by IDP. !
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NPTS960506 !
1 ' Page 4 of 5
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- 5. Followup performance testing of spare DHP.
A. IDP Faaw=*ibilities:
Conduct followup performance test consistent with previous baseline performance testing from Item #3; reproduce head versus flow conditions as closely as possible.. 1 Document performance test results for FPC review and approval. i
~
B. FPC Responsibilies:
Evaluate performance test data against previous hw%e testing results from item #3 to determine the total degradation in pump performance caused by low flow operation.
- Evaluate performance test data against the minimum ES 3'
performance requirements provided in NED96-0550.
Resolve comments / discrepancies, if any exist, prior to proceeding .
with post-test teardown and inspection. i
- 6. Post-test teardown and inspection of spare DHP.
A. IDP Responsibilities:
4 -
As with the pm test teardown and inspection, utilize MPR post-test i inspection report from 1989 testing conducted at CR-3 site l (Enclosure 2 of MPR to FPC letter dated April 12,1989) as a
- nininium scope; inspection beyond the minimum acope is at
~
, IDP's discretion.
Document inspection results and provide to FPC for review and approval. ,
B. FPC Responsibilities:
Review and approve all inspection documentation; provide comments to IDP as needed and facilitate resolution of comments.
Notify IDP to proceed with pump refurbishment upon final approval of post-test inspection results.
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Page 5 of 5-1 i )
- 8. Refurbishment of TMI-1 spare DHP.
I A. IDP Responsibilities:
i
- Refurbish TMI-l's spare DHP to include replacement of the following components at a minimum (reference Worthington i
Drawing #RX-130855): Item #6, thrust bearing; Item #8, line bearing; Item #3, casing ring; and Item #3A, stuffing box ring.
- Perform additional refurbishment of pump as specified by FPC based on findings from the post-test teardown and inspection.
Complete refurbishment within 10 days of the completion of the post-test teardown and inspection; contact TMI-1 System Engineer i i Bill McSorley at (717)S48-8727 when pump is ready to be shipped back to TMI-1.
- B. FPC Responsibilities:
j
- Interface . with TMI-1 as needed to determine additional i
' refurbishment required beyond the minimum specified by GPU. l
- Following return of the spare DHP to TMI-1, contact GPU and verify that their QA department has inspected the pump for 3
damage; as a minimum, it should be verified that the shaft can be i '
! rotated by hand and that the pump is clean externally and internally (best effort without disassembly).
i If you should have any questions or require further information, please contact Phil j
!' Saltsman at 240-3390.
l Q!. ,
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- w. l Philip E. Saltsman, Senior Nuclear Mechanical Engineer
- Nuclear Plant Technical Support
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- cc: F. X. Sullivan
! A. G. Washburn j C. L. Miller i W. J. Barwer Records Management f i
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MPR AscoctATEs INC.
l
- g. . MPR Letter Dated
- April 12, 1989 I
(
CRYSTAL RIVER UNIT 3 DECAY HEAT Mar $
RSF INTERNALS INSPECTION REQUIRDENT5
! Inspections of the pump internals and the rotating element of the decay 1 heat pumps at Crystal River Unit 3 are recosunended before* and after the ;
proposed low flow operability test. The purpose of these inspections is
- c to document the initial condition of the pumps prior to the test, and to verify that the pumps were not significantly degraded during the test l
(i.e., the pump's function is not compromised). The inspection requirements for before and after the test are as follows:
- 1. Stationary Components t ,
A. Casing Rings and Stuffing Box Rings,- These rings shall be I i visually inspected for rubbed areas and excessive wear i from contact with the impeller caused by thermal expansion
!I or deflections from hydraulically-induced loads. The clearance between the casing ring and the impeller wear surface should be between 0.015 and 0.064 inches. The i
- clearance between the stuffing box ring and the impeller wear surface should be between 0.015 and 0.054 inches.
(See Reference 1 for both sets of acceptance crinria).
If the clearances exceed these values, then the p ap should be re; mired per Reference 1.
s i
u 8. Volute Tongues - The volute tongues shall be visually inspected for cavitation damage resulting from discharge recirculation. The volute tongues should be free of Aaxagg cavitation-induced damage that would prevent the
!. i pump from functioning, e.g., when the structural integrity i
of the tongue may be compromised. This will be evaluated 4
and repptred on a case basis.
I i
Pump 1B is to be tested. The rotating element for this pump was replaced in January 1988. The pump has seen limited service since then, but none at low flows; therefore, this pump
!~ should be in good condition. A pre-test inspection is not !
, considered essential but is desirable to obtain baseline
' conditions. This will identify damage that accumulated during
, .I the test only. 4
'( 1.
C. Areas of Tight Clearances with Rotating Parts - Areas with
' tight clearances with rotating parts (e g., the stuffing box busMng and the gland plate) shall be visually inspected for wear caused by thermal expansion or F
deflections from hydraulically induced loads. These' areas i
! should be examined for evidence of severe rubbing damage !
j which eight interfere with pump operation. The clearance
' between the stuffing box bushing and shaft should be between 0.001 and 0.004 inches. A clearance greater than
) ; 0.004 inches should be evaluated further by Site Nuclear
- 1 Engineering for acceptability (Reference 1) and need for
- repair.
4 2. Rotating Components i
i A. Shaft - The shaft shall be inspected for straightness, '
t fatigue cracking, and sleeve wear at areas of _ tight
)
clearances with stationary parts.
- 1. Straightness shall be verified by measuring its runout at 0*, 90', 180', 270', and O*, along the 1
ertire length of the shaft. Total Indicated Runout '
(TIR) shall not exceed 0.002 inches (Reference 1). A '
shaft that is not straight should be repaired or
' replaced. , ,
- 11. 1.iquid penetrant examination of the entire shaft
/ shall be performed, with particular emphasis on the t
keyways and fillets. The shaft shall be free of '
cracks. A cracked shaft shall be replaced. Any crack indications should be evaluated on a case
[ basis. A crack that is attributed to the test and
- ' would have led to shaft failure shall indicate that the machine is unacceptable for the expected low flow service. Corrective action shall be developed.
i i
e 111. The shaft sleeve shall be visually inspected for I wear. This wear should be verified at the i
corresponding location on the stationary part. The i
acceptance criteria in 1.C applies.
I l
. 8. Impeller - The impeller shall be visually inspected for cavitatlon damage, wear on impeller surfaces, cracking of the shroud, and impeller-shaft joint integrity.
' ~
- 1. The pressure side of the impeller vanes shall be visually inspected for cavitation pitting caused by internal recirculation at the suction (the underside of the vane) and at the discharge (the visible side of the vane). The impeller should be free of Agrata cavitation-induced damage which would compromise the l
' structural intogrity of the impeller. This will be
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evaluated on a case by case basis. Evaluation shoulo (R include need for repair or replacement.
' 11. The wear surfaces on the impeller shall be visually
- inspected for rubbed areas and excessive wear. The acceptance criteria in 1.A. applies.
l iii. The shroud at the discharge of the impeller shall be inspected by liquid penetrant examination for cracks on the inner and outer surfaces. The shroud should l
be free of cracks. All crack indications shall be i4 evaluated on a case basis. Any damage shall be repaired or the impeller shall be replaced.
iv. The tightness of the impeller on the shaft shall be verified. This joint shall be considered acceptable
' if no relative movement of the impeller with respect
' ' to the shaft occurs when shaken by hand and the j impeller nut is properly torqued. The pump manual nor the pump maintenance procedkre provides any guidance on proper tightness. The pump vendor should supply the proper torque value. This ensures that no impact loads due to relative movement of the impeller and shaft occur during pump operation.
l l C. Bearings - The bearings shall be in'spected for proper fit
' onto the shaft and into the housing, scoring, overheating, and fatigue damage.
- 1. The inner raceway shall be verified to be firmly held on the shaft, i.e., the raceway cannot turn on the shaft. A clearance of +0.0003/-0.0002 inches shall be verified for the line bearing 'and +0.0003/-0.0004 inches for the thrust bearing (Reforence 3). Al so, j
the raceway shall be verified with a feeler gauge to be pressed firmly against the shaft shoulder. These conditions indicate that the bearing has been installed correctly (Reference 2).
l 11. The outer raceway shall be verified to be fimly held In the housing, i.e., the raceway cannot turn in the housing (Reference 2). A clearance of 4.001/-
i 0.0006 inches shall be verified for the line bearing and +0.0024/ 0.0001 inches for the thrust bearing
+
- (Reference 3).
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' 111. The inner races of the duplex mounted thrust bearings l r
- shall be verified to be in contact and that the thrust bearing lock nut is tight. The pump manual (Reference 2) provides only this guidance. Because
' overtightness may damage the bearings, the bearing vendor should supply the proper torque value. These 4
conditions indicate that the thrust bearing has been installed correctly (Reference 2).
tv. The balls and the raceways shall be visually inspected for cracking, scoring, and signs of l
overheating. The balls and raceways shall be free of cracks, substantial score marks, and signs of i
overheating. Any damage shall be evaluated on a case basis. This will indicate that the bearings were not j damaged.
) , 1 l
To record the results of the inspections, data sheets should be developed. These data sheets should include space for recording clearances at the easing ring impeller, stuffing box ring-f apeller, and the stuffing box-shaft; shaft TIR values; bearing-shaft clearances for the line bearing and thrust bearing; and bearing housing clearances for the line bearing and thrust bearing. Sketches of damaged areas and
' remarks on component conditions should be accommodated on these sheets.
It is also recommended that this inspection be documented by photographs ,
of the components.
i REFERENCE !
Pumps,' Revision 23 dated 01/27/89.
- 2. Florida Power Corporation Instruction Manual Number 7, "Worthington 1
! Centrifugal Pumps Types HN, HNT, and HND Instructions," Revision 3. !
- 3. SKF Product Catalog Number 4508, 1974.
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