ML20010F776
| ML20010F776 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 09/03/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8109110315 | |
| Download: ML20010F776 (2) | |
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TENNESSEE VALLEY AUTHORITY CH ATTANOOG A, TENNESSEE 37401 400 Chestnut Street Tcaer II C,
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Mr. James P. O'Reilly, Director
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Office of Inspection and Enforcement r
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Region II - Suite 3100
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101 Marietta Street 4
Atlanta, Georgia 30303 v'.N
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Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - REACTOR BUILDING COOLING FANS -
BLHD-50-438/81-16, BLRD-50-439/81 THIRD INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector R. W. Wright on January 28, 1981 in accordance with 10 CFR 50.55(e) as NCR 1351. This was followed by our interim reports dated Febuary 27 and June 2, 1981. Enclosed is our third interim report. We expect to submit our next report by December 24, 1981. We consider '10 CFR Part 21 to be applicable to this deficiency.
If you have any questions concerning this matter, please get in touch with D. L. Lambert at FTS 857-2581.
Very truly yours, TENNESSEE VALLEY AUTHORITY l-nt ntilla b OSK L. M. Mills, Manager Nuclear Regulation and Safety Enclosure cc:
Mr. Victor Stello, Jr., Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 Mr. James McFarland (Enclosure)
Senior Project Manager Babcock & Wilcox Company P.O. Box 1260 Lynchburg, Virginia 24505 8109110315 810903
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'6ig An Equal Opportunity Employer
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a ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 REACTOR BUILDING COOLING FANS 10 CFR 50.55(e)
BLRD-50-438/81-16, BLRD-50-439/81-16 THIRD INTERIM REPORT 4
Description of Deficiency The reactor building cooling system consists of three integral fan cooling coil units as well as other equipment. Onsite inspection of the fan motors by a service representative of the motor manufacturer (Reliance Electric Motor Company, Cleveland Ohio) revealed that old grease in the bearings had become hard and that grease was forced onto the motor winding when new grease was pumped into the bearings.
The Reliance service representative also witnessed the regreasing of the motor bearings. It was noted that grease easily purged out of the relief hole with the relief tubing dieconnected; but when the tubing was reconnected, grease did not purge properly from the relief tubing.
Instead, it passed across the seal and onto the wind ngs. This is because of the fact that the grease relief tubing in these fans is undersized.
Also, these fans are required to receive semiannual maintenance to include the purging of bearing grease. This cannot be easily accomplished with the present configuration of grease relief tubing.
The units were purchased from B&W, Interim Progress B&W stated this condition wou?d not have occurred if TVA had followed the lubrication schedule supplied by Reliance. Consequently, TVA requested that B&W provide a Reliance service representative to supervise motor cleaning at Bellefonte.
While failure to fo1. low Reliance's lubrication schedule may have aggravated the situation, it was not the cause of the grease being forced past the setl and onto the winding. This would have occurred even if TVA had followeu the lubrication schedule. The grease relief tubing installed by the fan supplier has a smaller diameter than the grease relief hole on the motor. As a result, the path of least resistance for purging grease is past the grease seal rather than through the relief tubing.
Reliance informed B&W that the grease relief tube can be eliminated. TVA has advised B&W of its concurrence with Reliance's recommendation to delete the grease relief tubing. The motors have been shipped to Reliance for removal of the relief tubing and cleaning of the windings.
The motors are to be returned to the Bellefonte site by September 30, 1981. B&W will have Reliance revise the instruction manual to clrrify the procedures and schedules for regreasing the motors.
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