ML20004F760
| ML20004F760 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 06/02/1981 |
| 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 8106220293 | |
| Download: ML20004F760 (2) | |
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y TENNESSEE VALLEY AUTHORf7V eM AT* A Nc OG A. ?EN*8$*[EE P4*?
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.Ia June 2, 1981 BLRD-50-438/81-16 BLRD-50-439/81-16 fg g V g pp
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'[t Jul/ y O IS8Ih C'3 Mr. James P. O'Reilly, Director j$j I
Office of Inspection and Enforcement U.S. Nuclear Regulatory Comission D&704 Region II - Suite 3100 g
101 Marietta Street
.N Atlant, Georgia 30303 9%\\
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - REACTCH VENT COOLING FANS -
BLRD-50-438/81-16, BLRD-50-439/81 SECOND INTERIM REPORT The subject deficiency was initially reported to NRC-OIE Inspector R. W. Wright on January 28, 1981, in accordance with 10 CFR 50.55(e) as NCR 1351. This was followed by our first interim report dated February 27, 1981. Enclosed is our second interi= report. We expect to submit our next report by September 3, 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, yNNESSEEVALLETAUTHORITT c9 y, s 3 y
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E. M. Mills, Manager Nuclear Regulation and Safety-Enclosure cc:
Mr Victor Stello, Jr., Director- (Enclosure)
Off'.ce 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
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-ENCLCSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 REACTOR VENT COOLING FANS BLRD-50 438/81-16, BLHD-50-439/81-16 10 CFR 50.55(e)
SECOND IN1'ERIM REPORT 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) revealed that old grease in the bearings had beccce 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 regressing of the motor bearings.
It was noted that grease easily purged out of the-relief hole with the relief tubing disconnected; but when the tubing was reconnected, grease did not purge properly from the relief tubing.
Instead, it passed across the seal and onto the windings. This is due to the fact that the grease relief tubing in these fans is undersiced.
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 had stated this condition would not have occurred if TVA had followed the lubrication schedule-supplied by Reliance. Consequently, TVA requested that B&W provide a Reliance-service representative under secticn V, item 16, of the contract to supervise motor cleaning at Eellefonte.
While. failure to follow Reliance's lubrication schedule may have aggravated the situation, it. was: not ther cause< of the grease being-forced.past the seal.and ento the winding.. This would.haveroccurred even if TVA had followed 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 thrcugh the relief tubing.
TVA has sent nonconformance report (NCR) No.1351 to B&W. TVA has informed B&W cf a recommended disposition-for the NCR.
B&W was requested to provide-concurrence with the recommended disposition or provide an alternate disposition.
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