ML20137R629
| ML20137R629 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 01/24/1986 |
| From: | Domer J TENNESSEE VALLEY AUTHORITY |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-86, REF-PT21-86-061-000 PT21-86-061-000, PT21-86-61, SCR-BLN-3668-R1, NUDOCS 8602130340 | |
| Download: ML20137R629 (2) | |
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TENNESSEE VALLEY AUTHORITY SN 105B Lookout Place c
January 24, 1986 c)
-t r1 BLRD-50-438/86-01 cu
.c.
U.S.
Nuclear Regulatory Co=tission Region II c
Attention:
Dr.
J.
Nelson Grace, Regional Administrator A
101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323
Dear Dr. Grace:
BELLEFONTE NUCLFAH PLANT UNIT 1 - BROKEN MOTOR tiOUNT1flG STUDS ON DIESEL BUILDING EXHAUST FANS - BLHD-SO-438/86 FIRST_.1HTERIM _R.EPOR_T The subject deficiency was initially reported to NRC-01E Inspector Steve Weise on December 26, 1985 in accordance with 10 CFR 50.55(e) as SCR BLU 3668 Hl.
Enclosed is our first interim report. We expret to cubmit our next report no later than one year before fuel load.
We corisider 10 CFR Part 21 applicable ~to this deficiency.
If there are any questions, please get in touch with H.
- 11. Shell at FTS 858-2688.
Very truly yours.
TEUEESSEE VALLEY AUTitORITY J. A.
Domer, Chief Nuclear Licensing Branch Enclosure cc:
rir. Jar.es Taylor, Directer (Enclocure)
Office of Inspection and Enforcecent U.S. Nuclear Regulatory Com.incion Washington, D.C.
205S5 Hecords Center (Enclosure)
Inutitute of Nuclear Power Operations 1100 Circle 15 Parkway, suite 1500 Atlanta, Georgia 30339
'4 8602130340 06
$6 I
thl An Equal Opportunity Employer y
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o-EUCLOSURE~
j_
BELLEFOUfE HUCLEAM PLANT UNIT 1 BROKEH nOTOR HOlluT1HG GTUDS OU DIESEL DUILD1HG EXHAUST FAUS BLHD. 4 38 /36-01 SCR BLU 3668 R1 10 CFN 50.S'2(e)
FIRST.IUTER1h MEpONT Desc ri t lu.n_ of _ f)pf 1e lency.
2 Seven of eight.notur counting studa broke from the mounting bau++ un two dieuel.
building exhaust f anu (IVG~niAN-001-A and 002-A), und : tutor shaf t-Lo-cheave key came out un f an 001-- A.
In addition, vendor drawing indicates four studs required, but equipment has eight studs.
The cause of thiu deficiency in due to excessive fan vibritions during operation. The discrepancy in the number of mounting stude appears to be an oversight during release tor shipment inspectionc. The inspeelion incident appearn to be an isolated occurrence; however, the vibration problem appears to exist in sister fans from the vendor ~-Indualcial Air Incorporated. A:c+lia, Ohio.
Sa fety..ir.;pllea t ions The tans provide cooling for Lhe dieuel generator spaces.
A failure of one fun would bring a uLandby fan un.
However, the vibration ueems to be preuent in all these f ans, which could lead to a co.~.aun-mode failure. Thlu would result in posulble overheating of essential components, which would recult in loca of essential powet and would jeopardize the capability to bring the plant to a cafe shutdown condillon.
.Ip t+Leici _{Tugfsn TVA has contacled the vendor about the problem.
Documentation of the balance condillon at the Line of ship;aent indicates acceptable' levels of vibration.
A request tur a fleid representative from Industrial Air incorporated to fleid balance and adjuut the fans is in process now.
If induntrial Air cannot balance the fans in the fluid, they will make the necescary modifications to the fans in order to balance them.
Should drawing revisions be required, an ECN will be written at that tic.e.
A tinal report will be provided upon determination ut currective nellun but no later than une year before tuel load.
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