ML061940437
| ML061940437 | |
| Person / Time | |
|---|---|
| Site: | Indian Point  |
| Issue date: | 06/18/1998 |
| From: | Entergy Operations |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| FOIA/PA-2006-0007, R4-5A14 | |
| Download: ML061940437 (11) | |
Text
jewrgy up" ions, inc. u~onamion K'"lOrt LIST August 31, 2: 12:56 PM R-IP2-1998-05247 Significanco: C - CORRECT ONLY Reportablity: 3)
- 'i Operability: CR Status:, Closed on December 01, 1998 Classificatlon Code: NON-SIGNIICANT xcriptln:
CA 9805247 - DURING THE PERFORMANCE OF PTQ26B FOR 22 SERVICE WATER PUMP PMT98-01 596. THE PUMP WAS STARTED WITH MAINT PRESENT. THE PUMP MADE 1hJ 3LUNKING NOISE AND THE PACKING GOT HOT WHEN IT WAS RUN AS PER MAINT. 22 PUMP WAS SECURED AND THE LINE UP RESTORED AS PER SRO. NO DATA CA AQ PnI I ::TEf BUIT PE IMP TEST FAILS WO STILL IN MPT STATUS;, MAINT TO EXAMINE PUMP AGAIN. I Responsible Dept: ENG-Engineering Support Mgmt CA&A
Contact:
__Originated: 06/1811998 by Hughes,Gerald L. ENG P&C-Equlp Reliability Staff Affected Systems: Affected Equlpmentr k, R-IP2-1998-05248 SignM.fcance: C- CORRECT ONLY Roportabllity:
Operablity. CR Slatus: Closed on October 20, 1998 U, (4
vi Classification Code: NON-SIGNIFICANT kD scilPtlon:
r9805248- DURING PREP FOR 22 DEGASSING PUMP RUN FOUND THE FOLLOWING:
N-7141 CA-718 WERE FOUND CLOSED WITH CAUTION TAGS STATINGVALVES THROTTLED. THESE TAGS WERE HUNG FOR CONFIGURATION CONTROL DUE TO COL 4D SOP CALLING FOR THESE VALVESTO BE OPEN. CAUTION TAG 97-401 WAS IN THE FIELD. CCR INFORMED VALVES LEFT AS FOUND UNTIL ENG. INPUT RECEIVED Responsible Dept: CRGICARB/OSRC CA&A
Contact:
Originated: 0611811998 by JONES. RICHARD P. Operations Watch Staff Affected Systems: Affected Equipment:
,R-IP2-1998;05268 Significance: C-CORRECTLONLY RepoftbtIilty:
Operabilly: CR Status: Closed onAugust 24, 1999 Classificatton Code: :NON-SIGNIFICANT
,scrdptfon:
39805268 -THE TEST GROUP WAS USED TO OPERATE 22 SWP AFUER MAINTENANCE (REPACK) USING THE MONTHLY TEST AS A PMT. THE FIELD OPERATORS
-FALLENGED THIS PRACTICE AND IT WAS NOT RESOLVED. PAST PRACTICE HAS BEEN FOR OPERATIONS TO PERFORM THIS TESTING (PMVS). THE MAINTENANCE DID OT HAVE A FORMAL PRODURE TO ADJUST THE PACKING GLAND WHILE OPERATIONS MUST USE AN SOP. THE SOP IS 24.1 REV.32 SECION .5SERICE WATER UMP PACKING ADJUSTMENT. THIS WAS BROUGHT UP AS A PRECONDITIONING ISSUE, POOR MAINTENANC Responsible Dept: E-Plan Mgmt CAS AContact: Originated: 06/18(1998 by JONES, RICHARD P, Operations Watch Staff Affected Systems: Affected Equipment:
- I'ztA rlPJ.~ *aj .LiA *%
914 739 9359 P.0e7
- Entergy I CONDITION REPORT [CR-mP2-1998-05247 I Originator: Hughes,Gerald L Originator Phone: o Originator Group: ENG P&C-Equip Reliability Staff Operability Required. N Reportability Required; N Supervisor Name; SHEIKH, ARSHAD Discovered Date: 06/18/1998 00;00 Initiated Date: 06/18/1998 00:00 Condition
Description:
CR Date; 06/18/1998 31:42 CR Entered Date: 0611811998 11:57
-DURING THE PERFORMANCE OF PTQ26B FOR,22 SERVICE WATER PUMP PMT98-01596. THE PUMP WAS STARTED WITH MAINT PRESENT. THE PUMP MADE A CLUNKING NOISE AND THE PACKING GOT HOT WHEN IT WAS RUN AS PER MAINT. 22 PUMP WAS SECURED AND THE LINE UP RESTORED AS PER SRO. NO DATA WAS COLLECTED BUT PUMP TEST FAILS. WO STILL IN MPT STATUS.MAINT TO EXAMINE PUMP AGAIN.
Immediate Action
Description:
Suggested Action
Description:
TRENDING (For Reference Purposes Only):
Trend T*ne Trend Code IP IP-TEST FAILURES EQ EQ-XA
I q A 044..fr A if , ,; 71 O g 11 914 739 9359 P.08 In*eix" [CR-IP2-19.98-05247 I ADMJN Ihitiated Date; 6/18/1998 0:00 Owner Group :ENG-Engineerlng SupportMgmt
'Current
Contact:
Current Significance; C - COIRXRECT ONLY Closed by: e-CAPtain, CRS 12/1/1998 0:00 Summary
Description:
'199805247 - DURING THE PERFORMANCE OF PTQ26B FOR 22 SERVICE WATER PUMP PMT98-01596. THE PUMP WAS STARTED WITH MAINT PRESENT. THE PUMP MADE A CLUNKING NOISE AND THE PACKING GOT HOT WHEN IT WAS RUN AS PER MAINT. 22 PUMP WAS SECURED AND THE LINE UP RESTORED AS PER SRO, NO DATA WAS COLLECTED BUT PUMP TEST FAILS. WO STILL IN MPT STATUS. MAINT TO EXAMINE PUMP AGAIN.
Remarks
Description:
Closure Description; PCRS Conversion
F- -'Ooa OR/-Il 1?.lp.n-, q14 719 9190 Q/lq I I PAJQ-31-2004 13:24 914 739 9359 914 739 9359 P. 09 CR-IP2-1998-05247 ASS IGNME~NT S I w I Version: 1
-. Significance Code: C - CORRECT ONLY Classification Code: NON-SIGNIFICANT Owner Group: ENG-Enginecring Support Mgnmt Performed By; e-CAPtain, CRS 12/01/1998 00:00 Assignment Description!
RUU-31-2004 13-124 9 14 739 9359 914 739 9359 P.10
~Entergy I CORRECTIVE ACTION CR-IP2-1998-05247 CA Number: I i Group Name Assigned 3y: CA&A Staff E-CAPTAIN, CRS Assigned To: ENG-Engineering Support Mgmt Poirier,Thomas E Subassigned To:
Originated BY: E.CAPTAIN, CRS 1112/1998 00:00:00 Performed By: PorieThomas E .12/1/1998 00:00:00 Subperformed By:
-Approved By; Closed By; PoirierThomas E 12/1/1998 00:00:00 Current Due Date; 12/02/1998 Initial Due Date: 12/02/1998 CA Type: 6ISP - CORR ACTION Plant Constraint; -NONE CA Destription:
CITnS/CRS CONVERSION - You are assigre*edwnership of this event and the lead for all subas.ignments, per SAO-1 12.
(CAG)
CA REFERENCE ITEMS-
'Description CRS ID 80304
2004 08/11 12!18!02 Q14 71q 01;9 11119 - 1 1 AUG-31-2004 13:24 914 739 9359 914 739 9359 P.11 CORRECTiVE ACTION CR-IP24998-05247
Response
Priority 3 Analysis Completed.
ignificance Level 3 Report 7-i1he information below was Engineering's (Edson White) SL-2 response to CR # 199805612 for this same problem. This CR is being closed to that response and the corrective actions to be completed under CR # 199805612.
Stehen B. Carpenter 12/1/98 The service water pumps currently in service are recent installations and were manufuctured by the Johnston Pump Company.
In general this new service water pump is a niggedized version of the previous service water pumps manufactured by Layne and Bowler, and Aroura.
The Johnston pump is configured with a thermoplastic guide bearing mounted in the bottom of the pump stuffing box. This guide bearing relies on leak off through the packing gland for cooling. The stuffing box Is packed with 5 rings of John Crane 1625 graphite packing. A lantern ring Is installed located in between the three bottom rings ofpacking and two top rings.
We have been experiencing problems with this stuffing box/packing gland I bearing arrangement. Changes have been made to the design and clearance of the bearing located In the bottom of the stuffing box. We have also tried different sizes and styles of packing., The current design bearing is identical to the originally supplied design With one exception. The bearing radial clearance has been ln~eased. This arrangement is currently Installed on 22,23, 24 and 25 service water pumps.
Pump 21 is as origlnally supplied with the smaller clearance in the upper bearingand pump 24 has a bearing with a fluted design.
Problems with these service water pumps stem from the design requirement of a relatively high amount of flow through a packed stuffing box essentially designed for minimal leakbff. :Normally, one could loosen the packing gland studs and this would allow for an increase In packing box leak off, In the case of these pumps, the packing "stack" is Comprfesed not only from the packing gland, but also from the force of the 100 psi water pressure acting on the bottom. The resultant force on the packing stack from this water pressure is over 400 p6unds. Thls situation creates difficulty in obtaining a high amount of
- uuip packing leak off.
.The original short life of these service water pumps was due to problems regarding stuffing box leak off and stuffing box bearing problems, When thepumps were removed from service for packing replacement, problems were noted In the stuffing box bearing. This bearing was observed to have extruded up intothe packing area of the stuffing box. A review of the original design had shown that the original bearing clearance was too tight. The immediate fix for this problem was to increase the clearance of the stuffing box bearing. A further review of this problem was perforihed and a decision was made to intstall a bearing with a fluted design. Upon installation of this fluted design, we experienced problems associated with getting sufficient leak off through the stuffing box. High leak off temperatures resulted. The lower leak 6ff flow was attributed to the bearing no longer acting as a throttling device and the subsequent higher pressures on the packing. This higher pressure resulted in a decrease In packing leak off.
We have made attempts lo Increase the leak offflow of these service water pumps. The original packing supplied was six rings of ? Inch John Crafie 1625 ( graphite packing with Teflon. One ring ofPacking has been removed and we now have 5 rings of? inch 16250 packing. 'We hive tried John Crane style1635, a graphite paoking without Teflon. The leak off did not increase with this packing and 1625G was reinstalled. We installed 6 rings of 7/16th inch John Crane 16250. This packing was installed on a pump with fluted bearings. The leak off was excessive. We reinstalled 5 rings of? inch packing.
The p - see attachment for rest Subresponse:
Closure Comments:
N/A Attachments:
Resp Description Priority 3 Analysis Completed.
AUG-31-2004 13:25 914 739 9359 914 739 9359 P.12 Attachment Header Document Name:
r P2-1998-05247 CA-00001 Document Location JResp Descdption Attach Tide:
jPriorlty 3 Analysis Completed.
I. 'I)g P I 11'1 1 . 21 1g 1/
914 739 92359 914 739 9359 P.13 Priority 3 Analysis Completed.
Significance Level 3 Report The information below was Engineering's (Edson White) SL-2 response to CR #
199805612 for this same problem. This CR is being closed to that response and the corrective actions to be completed under CR # 199805612.
Stehen B. Carpenter 12/1/98 The service water pumps currently in service are recent installations and were manufactured by the Johnston Pump Company. In general this new service water pump is a ruggedized version of the previous service water pumps manufactured by Layne and Bowler, and Aroura.
The Johnston pump is configured with a thermoplastic guide bearing mounted in the bottom of the pump stuffing box. This guide beating relies on leak off through the packing gland for cooling, The stuffing box is packed with 5 rings of John Crane 1625 graphite packing. A lantern ring is installed located in between the three bottom rings of packing and two top rings.
We have been experiencing problems with this stuffing box / packing gland / bearing
- arrangement. Changes have been made to the design and clearance of the bearing located inthe bo6tom of the stuffig box, We have also tried different sizes and styles of packing. The current design bearingis identical to the originally supplied design with one exception. The beiring radial clearance has been increased. This arrangement is currently installed on22, 23,24 and 25 service water pumps. Pump 21 is as originally supplied with the smaller clearancein the upper bearing and pump 24 has a bearing with a fluted design.
Problems with these service water pumps stem from the design requirement of a relatively high amount of flow through a packed stuffing boxressentially designed for minimal leak Off, Nomally, one could loosen the packing gland studs and this would allow for an increase in packing box leak off. In the case of these pumps, the packing "stack" is compressed nOtrOnly from the packing gland, but also from the force of the .100 psi water pressure acting on the bottom, The resultant force on the packing stack from this water pressure is over 400 pounds. Ths situation creates difficulty in obtaining a high amount of pump packing leak off.
The original short life of these service water pumps was due to problems regarding stuffing box leak offand stuffing box bearing problems. When the pumps were removed from service for packing replacement, problems were noted in the stuffing box bearing.
This bearing was observed to'have extruded up into the packing area of the stuffing box.
A review of the original design had shown that the original bearing clearance was too tight. Theimmediate fix for this problem was to increase the clearance of the stuffing box bearing. A further review of this problem was performed and a decision was made to install a bearing with a fluted design, Upon installation of this fluted design, we
I )n 14U LWA0'11471 Ia 410 1 F1,U*-31i-2D04 :13:25 914 739 9359 914 739 9359 P.14 experienced problems associated with getting sufficient leak off through the stuffing box.
High leak off temperatures resulted. The lower leak off flow Was attributed to the
- bearing no longer acting as a throttling device and the subsequent higher pressures on the packing. This higher pressure resulted in a decrease in packing leak off.
We have made attempts to increase the leak off flow of these service water pumps, The original packing supplied was six rings of Y inch John Crane 1625 G graphite packing with Teflon. One ring of packing has been removed and we now have 5 rings of V2 inch 1625G packing. We have tried John Crane style 1635, a graphite packing without Teflon. The leak off did not increase with this packing and 1625G was reinstalled. We winstahled 6 rings of 7/16th inch John Crane 1625G. This packing was installed on a pump with fluted bearings. The leak off was excessive. We reinstalled 5 rings ofW/ inch packing.
The problem of low flow is most prevalent when the pump is first packed. At this time areas of the packing are soft and easily extruded by the stack forces onto the pump shaft.
In some areas, the packing is making relatively hard contact to the pump shaft and creating heat. This condition results in high gland leak off temperatures until the packing has worn in where the hard rubs have been minimized andthe amount of heat generated in the packing stack is reduced. Indian Point is not the only plant experiencing problems with service water pump packing break in. Some plants have placed external cooling water on the packing~gland for the first 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of operation, Our pump manufacturer had endorsed this practice. Ourpractice is not to use external cooling. We have been monitoring the temperature of the packing gland wlit a not to exceed tempeature of 180 degrees F. This temperature limit is conservatively lower than the stuffing box components can withstand.
The following information was Engineering's (Edson White) response to CR #
199805612 The.punp shaft and shaft sleeve is manufactured from a stainless steel know as Nitronic
- 50. Nitronic 50 can withstand temperatures over 1000 degrees. John Crane 1625 packing is designed for service over 600 degrees F. The thermoplastic bearing i*the limiting factor. This bearing can withstand temperatures up to 230 degrees F.
With the current design of our pump, high temperatures ipon initial start up can be expected. The 180 degree limit allows the pump packing to break in. If steaming is observed, regardless of the packing temperature, the pump should be shut down.
Steaming means that temperatures exceed 212 degrees F. EXperience has shown that once a pump has had sufficient break in time, the leak off temperature does not exceed 120 degrees.
A long term solution t6 this problem is currently under development. A test rig'has been fabricated and different packing arrangements, leak off designs and throttle bushings are being pursued. The goal of this project is to eliminate the high heat experienced in the
AU*-31-2**4 13:25 914 739 9359 914 739 9359 P.15 packing gland during the break in period and to extend the life of the packing and stuffing box. The anticipated completion of this study is several months away, The pump bearing manufacturer, Thordon Bearings Inc., recommends a bearing cooling flow of I gallon per minute of shaft diameter. Our service water pump bearings are 2-7/16ths in diameter. This would correspond to a cooling requirement of approximately 2.5 gallons per minute. In a letter faxed to'Con Edison on April 14, 1998, Thordon revised this requirement to 1/2S gpm per inch of shaft diameter or 1-1/4 gpm total.
Measurements taken on our pumps InJuly of this year are shown below.
In order to increase the leak off rate and aid in the breaking in of the pump packing, we proposed and installed different sized packing in 23 service water pump. The packing type is the same, John Crane 1625G. The packing is arranged with three rings of 7/16ths on the bottom of the stuffing box, the lantern ring, a 7/16ths ring f packing, and two rings of Minch packing on the top. This arrangement increased the packing leak off and provides additional cooling forthe bearing and stuffing box.
This arrangement has worked well as an interim repair. The leakage out of the packing gland, while necessary for bearing cooling has the appearance of an excessive amount.
Ou current plan is to'design and test an improvement to this system and then install into the service water pumps, *Alarge leakage past the packing will also result in higher than normal packing Wear and lead to more frequent packing change Recommendation:
The pump was repacked with 5 rings of John Crane 1625G. If this packing'is replaced in the near future, repack with 4 rings of 7/16ths packing and 2 rings of 1/2" packing. Do not repack the pump unless the packing leak off is measured to be over 2.5 gpm,
HUG-6I-2U04 13:26 914 739 9359 914 739 9359 P.16 i A EntU i CORRECTIVE ACTION CR-IP2-1998-05247 CA Number: 2 Grout Name Assigned By: CA&A Staff E-CAPTAIN, CRS Assigned To: ENG-Engineering Support Mgmnt Polrier,Thomas E Subassigned To:
Originated By: E-CAPTAIN, CRS 7/3111998 00:00:00 Performed By: PolrierThomas E 11/3/1998 00:00:00
- ubperformed By
Approved By:
Closed By: E-CAPTAfN, CRS 11/3/1998 o00.:00o Current Due Date, 08/14/1998 -Initial Due Date: 08/14/1998 CA Type: PFR'oM*CA Plant Constraint; NONE CA
Description:
As per TPC 98-41, SAO 132, you retain th*elead for his OI1L Please make subassignment to engineering for failure analysis.
(JH)
CA REFERENCE ITEMS; Tvve Code Decriiption CRS ID -4758
-- sponsc:
111ill be answered under SL3 assignment. SBC 11/3/98 Subresponse:
Closure Comments:
N/A