ML20009C614
| ML20009C614 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 07/14/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| REF-PT21-81-479-000 PT21-81-479, PT21-81-479-000, NUDOCS 8107210269 | |
| Download: ML20009C614 (2) | |
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400 Chestnut Street Tower II July 14, 1981 V
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!l Mr. James P. O'Reilly, Director
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U.S. Nuclear Regulatory Commission 7,4's y
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Region II - Suite 3100
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Dear Mr. O'Reilly:
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BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - TRANSAMERfCA DELAVAL DIESEL GENERATOR TURBOCHARGER TIIRUST BEARING - BLRD-50-438/81-14, BLRD-50-439/81 FIFAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector R. W. Wright on January 27, 1981, in accordance with 10 CFR 50.55(e) as NCR BLN MEB 8101. This was followed by our first interim report dated February 25, 1981.
Enclosed is our final report. We consider 10 CFR Part 21 to be applicable to this deficiency. This deficiency was also reported on TVA's Hartsville and Phipps Bend Nuclear Plants.
If you have any questions concerning.this matter, pleare get in touch with D. L. Lambert at FTS 857-2581.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Manager Nuclear Regulation and Safety Enclosure cc:
Mr. Victor Stello, Jr., Director (Enclosure) 7 Office of Inspection and Enforcement 3
U.S. Nuclear Regulatory Commission
.1 Washington, DC 20555 Ii
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8107210269 810714 PDR ADOCK 05000438 S
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 TRANSAMERICA DELAVAL DIESEL GENERATOR TURBOCHARGER THRUST BEARING BLRD-50-438/81-14, BLRD-50-439/81-14 10 CFR 50.55(e)
FINAL P2 PORT Description of Deficiency Transamerica Delaval Incorporated (TDI) informed TVA of a potential defect in a component on some of their standby diesel generaters. The potential defect exists in the lubrication oil system that supplies oil to the turbocharger bearings. The design of this system permits lubricating oil to flow to the bearings only when the engine is runr.ing. The oil seal of the turbocharger is a 1&byrinth type seal which is only effective when the turbocharger is running. Because of the possibility'of seal leakage when-the turbocharger is in standby mode, the turbocharger lube oil system is bypassed at this time.
This defect may result in the turbocharger thrust bearings being prematurely worn. This condition could result in the unavailabi] ' '- ' *ha diesel generator.
Safety Imp 1.
The diesel generators constitute the preferred source of electrical power for essential safety features in the event of offsite power loss.
Therefore, the diesel generators must be maintained at high levels of confidence in order to assure emergency operation of esuential safety features.
If. this potential defect had gone ur. corrected and resulted in a failure of the diesel generators, this vital source of onsite emergenay power would be eliminated, which sould constitute a degradation in the safety of operations of the facility.
Corrective Action TDI has supplied TVA wit'.1 the details of a design change that will correct this deficiency. This change involves modifying the turbocharger lubrication piping t1 include piping from the pressur,1 ed main header to the turbocharger through a 0.014-inch orifice.
The vendor (TDI) maintains that this modification will compensate for any seal leakage, when the diesel generator is in^ the standby mode, by providing the turbocharger with an alternate source of lubrication during these times. TVA will implement this modification before preoperational testing of this system.
TVA will continue to review correspondence from TDI regarding these diesel generators.
If a future problem does occur, TVA will report their actions to the NRC as is required under 10 CFR 50.55(e).
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