ML20095K863
| ML20095K863 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 08/15/1984 |
| From: | Jens W DETROIT EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 55, EF2-69669, NUDOCS 8408300069 | |
| Download: ML20095K863 (3) | |
Text
e 4 L.
- (c Wayne H. Jens
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Vce Prrsident Q
Nucleer Opsratens A
Fermi-2 6400 North Dixur Hghway Neeponjegari 48166 August 15, 1984
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'EF2-69669
.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, February 23, 1984, QA-84-0084 (3)
- Letter, D.
A. Wells to J. G.
- Keppler, November 5, 1982, EF2-60505 (4)
- Letter, D. A. Wells to J.
G.
- Keppler, July 9, 1982, EF2-58749 (5)
- Letter, D.
A. Wells, to J.
G.
- Keppler, March 12, 1982, EF2-57149
Subject:
Final Report 10CFR50.55(e) Item 55
" Defective Spot Welds in Powerstrut i
Support Material" This is Detroit Edison's final report of Item 55, " Defective Spot Welds in Powerstrut Support Material."
Item 55 was originally reported as a potential deficiency on February 11, 1982, and subsequently documented in References (2),
(3), (4) and (5).
Description of Deficiency In November 1981, L.
K.
Comstock Quality Control reported to Detroit' Edison Engineering that Powerstrut combined channels of various configurations in stock at Fermi 2 exhibited a lack of fusion at the spot welds that 3oin the channel
. sections. Powerstrut channel material was being used at the time to fabricate conduit and cable tray supports.
The material was supplied by the Van lluffel Tube Corporation.
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Mr. JamesLG..Keppler ^
August :15, -198 4 -
LEF2-69669 Page12:
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An'alysistof-Safety Implications
-The'structurallintegrity ofisafety-related conduit and cable tray supports, fabricated :from Powerstrut combined channels could not be assured for design seismicLevent conditions
~
t without engineering: evaluation of_thisLdeficiency.
Corrective-Action 1&se -fo'llowing actions. have been completed to correct the-deficiency and prevent recurrence:
o L. K..Comstockl suspended the purchase and installation of'
-all Powerstrut1 configurations at Fermi 2.
o - - Seventy-five representative Powerstrut combined channel samples-were[sent to' Detroit Testing Laboratory, Inc.'in i
1982.
-A. peel test, a-macro-etch, and a < check for impurities were performed on:12 of the samples.
Shear strength: tests were performed on 63 samples.
From these test ;results,- Detroit Edison Engineering formulated i
allowable load criteria for -Powerstrut channels.
o Detroit Edison Engineering completed an analysis of the electrical supports using the results of the channel analysis.
With the exception of 138' supports in the Reactor'and Auxiliary Buildings, Powerstrut members.used for-Seismic' Category I cable tray and conduit supports were' determined ~to be seismically qualified ~without modifications.
Powerstrut members from the 138 defective
~
supports were identified under DDR E-7366, Rev. C and reinforced or replaced as required.
o At the request-of Detroit Edison, Sargent & Lundy Engineers completed'a' review ~of cable tray supports with Powerstrut members taking into account loading and design-changes 'made after the date of the Detroit Edison
-Engineering analysis. Sargent & Lundy determined that'no
.further support-modifications were required.
o. Detroit Edison revised the Electrical Engineering
. Standard' Specifications'to prohibit the use of Powerstrut channels.
1 h
I
Mr. James G.
Keppler August 15, 1984 EF2-69669 Page 3 This is Detroit Edison's final report on this item.
If you have questions concerning this matter, please contact Mr. Lewis P.
Dregni, (313) 586-5083.
Sincerely, i
J cc:
Mr.
P.
M.
Byron h
Mr.
R.
C.
DeYoung Mr.
R.
C.
Knop