ML20094N027
| ML20094N027 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 08/03/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-84-406-000 PT21-84-406, PT21-84-406-000, NUDOCS 8408160066 | |
| Download: ML20094N027 (2) | |
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~ IE'NNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 374of 400 Chestnut Street Tower II
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BLRD-50-438/84-15 BLRD-50' 439/84-14 U.S. Nuclear Regulatory Comunission Region II 5
Attn:.Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, NW,' Suite 2900
' Atlanta, Georgia 30323
Dear Mr. O'Reilly:
' BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - LOOSE DRIVE HUBS ON OVERSPEED 4
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-00VERNOR DRIVE SHAFT ON DELAVAL DIESELS -BLRD-50-438/84-15, BLRD-50-439/84 FINAL REPORT f
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The subject deficiency was initially reported -to MRC-0IE Inspector P. E. Fredrickson February 3,1984 in accordance with 10 CFR 50.55(e) as NCR BLV MEB 8431. This was followed by our interim report dated March 1, 1984. Enclosed is our final report. We consider 10 CFR Part 21 applicable to this deficiency.
If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.
~Very truly yours,
. TENNESSEE VALLEY AUTHORITY p
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L. M. Mills, Manager Nuclear Licensing.
Enclo,,ure s
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Mr. Richard C. DeYoung, Director (Enclosure) -
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J Office of Inspection and Enforcement U.S. Nucl. car Regulatory Commission Washington, D.C.
20555 Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 l
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l OFFICIAL COPY B408160066 B40003 PDR ADDCK 05000433 s
PDR An Equal Opportunity Employer 87
ENCLOSURS
~,s" BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 LOOSE DRIVE HUBS ON OVERSPEED GOVERNOR DRIVE SHAFT ON DELAVAL DIESELS BLRD-50-438/84-15, BLRD-50-439/84-14 NCR BLN MEB 8401 10 CFR 50.55(e)
FINAL REPORT Description of Deficiency
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Recently, on a non-nuclear commercial engine installation, Transamerica Delaval, Incorporated (TDI), of Oakland, California, discovered the flexible coupling drive hubs were loose on the shafts in the overspeed governor fuel transfer pump drive. This design has been used for many
- years and similar problems have not been reported. These hubs are manufactured by Lovejoy Coupling and installed by TDI.
In accordance with the requirements of 10 CFR 21, TDI notified the NRC of this potential defect in a component of a DSR or DSRV standby diesel generator in their letter to the Director of the Office of Inspection and Enforcement dated Janury 9,1984.
The root cause of the condition is that TDI's design and manufacturing procedures were inadequate thus allowing -for the possibility of the couplings coming loose after operation.
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Safety Implications J
r' If the overspeed governor stops turning, an alarm occurs but the engine will continue to operate.
If the fuel transfer pump stops turning, the engine will not operate unless there is an auxiliary fuel transfer pump driven by an external source.
TVA's diesels have no auxiliary pumps.
This potential problem with the overspeed governor and fuel transfer pump g,.
drive could result in engine nonavailability which would have adverse effects on the plant's ability to attain a safe shutdown condition during a loss of offsite power event.
Corrective Action l
The hubs have been inspected for looseness by removing the inspection
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covers and the overspeed drive. The hubs have been diecked for fit by removing the pin and key set screw. The hubs were found to be acceptable.
This inspection was accomplished per TDI Service Information Memorandum 1
(SIM) No. 363 l
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