ML20093J000
| ML20093J000 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 07/05/1984 |
| From: | Jens W DETROIT EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 106, EF2-69275, NUDOCS 8407250482 | |
| Download: ML20093J000 (2) | |
Text
_.. _
bD y
wayro w. az<i.
v<e P~,sm ra w cx~~s Detroi;t
~~
wx tenn o,..., e m IOOM Necur' Mac.NG34 431tC L-bdIQb/I I pagew so July 5, 1984 EF2-69275 Mr. James G.
Keppler Regional Administrator Region III U.
S.
Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137
Dear Mr. Keppler:
Reference:
(1) Fermi 2 NRC Docket No. 50-341 (2) Letter, D.
A.
Wells to J.
G.
- Keppler, December 5, 1983, EF2-66483
Subject:
Final Evaluation of 10CFR50.55(e) Item 106,
" Reactor Building Crane Problems" Detroit Edison has completed its investigation of Item 106,
" Reactor Building Crane Problems" and has determined the deficiency is not reportable under 10CFR50.55(e).
The failure of the reactor building crane to operate was due to the improper phase sequence of the power supply to one of the crane hoist motors.
This resulted in the tandem crane hoist motors working in opposition.
Tne cause of this deficiency was poor work practices by two different Startup group electricians involved in testing the thermal overload trips on this motor.
Detroit Edison concluded this item was not reportable because:
1)
The structure and the load retaining parts of the erane are safety-related.
The crane hoist motors are not load bearing components.
Failure of the hoist motors does not affect the safe operation of the plant.
B4072504B2 840705 y,=;2 7 \\0 PDR ADOCK 05000341 S
PDR JUL 161994
s a
Mr. James G.
Keppler July S, 1984 EP2-69275 Page 2 2)
Tne saotor failure was the result of the following personnel errors:
a.
The electrician who de-terminated the hoist iaotor did not tag the leads to show phase sequence.
b.
The second electrician who re-terminated the hoist motor leads made the connections based on the design drawing without referencing the As Built-Electrical (ADE) marked on the drawing. This ABC showed the phase sequence reversed from the design drawing.
c.
No operational test kas conducted after the leads were re-terminated.
Corrective Actions for these errors are identified and tracked on Incident Report 8 3-12C.
Based on the results of this investigation, De t roit Edison requests closure of 10CPR50.55(e), Item 106, " Reactor Building Crane Problems".
If you have questions concerning this matter, pleaae contact Mr. Lewis P.
Dregni at (313) 586-5083.
Sincerely,
/
(%
cc:
P.
M.
Byron R.
C.
DeYoung R.
C.
Knop