ML20128E140
| ML20128E140 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 05/07/1985 |
| From: | Booker J GULF STATES UTILITIES CO. |
| To: | Martin R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| DR-206, RBG-20928, NUDOCS 8505290307 | |
| Download: ML20128E140 (3) | |
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GULF STATES UTELITIES COMPANY RIVER SEND STATION POST OFFICE 80X 220 ST. FRANCISVILLE. LOUISIANA 70775 AREA CODE 604 635 6094 346-8651 May 7, 1985 RBG 20928 File Nos. G9.5, G9.25.1.1 Mr. Robert D. Martin, Regional Administrator
~U. S. Nuclear Regulatory Commission ohg Region IV 611 Ryan Plaza Drive,' Suite 1000 Arlington, Texas-76011 MAy ;4
Dear Mr. Martin:
1 River Bend Station - Unit 1 b
Docket No. 50-458
' Final Report /DR-206 On January 28, 1985, GSU provided Region IV a final 30-day written report on DR-206 concerning improper lubricant in the two fuel pool. cooling pumps and motors. The attachment to this letter is GSU's revised final report pursuant to 10CFR50.55(e)(3) with regard to this deficiency.
Sincerely,
@ J.'E. Booker Manager.-Engineering, Nuclear Fuels G Licensing River Bend Nuclear Group y.
Pso JEB/PJD/amg Attachment cc: Director of Inspection 6 Enforcement
.U. S. Nuclear Regulatory Commission Wa~shington, D. C.
20555 NRC Resident Inspector -Site INPO
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ATTACINENT May 7, 198S RBG-20928 DR-206/ LUBRICANT IN THE TWO FUEL POOL
~C00 LING' PUMPS'AND MOTORS Background and Description ~ of the Problem The deficiency concerns improper lubricant in the two fuel pool cooling pumps and motors as identified in Nonconformance and Disposition' Report (NSD) No. 6121. During initial testing.of fuel pool cooling pumps and motors ISFC* PIA /PM1A and ISFC*PIC/PM1B, the motors were found to be overheating. The cause of the overheating was attributed to excessive lubricant which had extended into the motor windings. Further examination revealed,that operational lubricants had been installed without removing the storage lubricant as a result of the responsible person's lack of familiarity with appropriate equip-ment lubrication procedures.
An audit of equipment storage history cards was performed by the preventive maintenance engineer on the following equipment to determine whether similar conditions exist:
RCIC pumps and motors RHR pumps and motors Recirculation pumps and motors Chilled water pumps and motors
' Filter demineralizer holding pumps and motors Reactor water cleanup pumps and motors Standby liquid control pumps and motors-RHR subsystem fill pumps and motors Chiller condenser recirculation pumps and motors Standby service water pumps and motors Heater drain pumps and motors Based on the results of this. audit, it was concluded that fuel pool cooling pumps and motors were the only types of equipment which received operational lubricants without the removal of storage lubricants.
To this date, no other equipment has been found to have a similar condition.
Hence, it can be concluded that this~is an. isolated case.
' Safety Implication
.The fuel pool cooling pumps are needed to provide decay heat removal from fuel stored in the spent fuel storage pool in the fuel building.
Under a worst-case scenario (i.e., seismic, LOCA, loss-of-offsite power
' postulated.to occur shortly after a refueling outage), loss of both fuel pool cooling pumps could potentially result in uncontrolled fission product release due to overheating of the stored spent fuel.
- .L. '
Page 2 May 7, 1985 RBG-20928 Corrective Action The motors identified on NGD No. 6121 were disassembled and associated bearing ~ cavities and windings cleaned of all traces of lubricant. The bearings'were inspected,:found to be satisfactory, then handpacked with operational lubricant. Then the motors were reassembled, meggered, and subsequently operated within the required parameters.
L As. preventative action, the person primarily responsible for this problem has been ' replaced and is no longer employed by Stone and Webster Engineering Corporation.
'In addition, all mi11 wrights and other personnel associated with the
~ preventive maintenance program have been made aware of the appropriate lubrication ~ procedures to be followed. These persons have also been informed to report to their supervisor any problems that they may incur while installing' lubricants, whether storage or operational.
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