ML20098D308
| ML20098D308 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 09/12/1984 |
| From: | Jens W DETROIT EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| EF2-69282, NUDOCS 8409270459 | |
| Download: ML20098D308 (3) | |
Text
'
s Wayne H. Jens V ce Pro krt hveea Or4 4
-s Detroit
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jQ M Ne ert W.
i 43 3
Iwvi l an m-"9 September 12, 1984 EF2-69282 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, H.
Tauber to J.
G.
- Keppler, April 20, 1981, EF2-5 26 23 (3)
- Letter, D.
A.
Wells to J.
G. Keppler, January 12, 1983, EF2-61532 (4)
- Letter, D.
A.
Wells to J.
G. Keppler, June 28, 1983, EF2-64304 (5)
- Letter, D.
A, Wells to J.
G.
- Keppler, November 25, 1983, EF2-66478
Subject:
Final Report of 10CFR50.55 (e) Item 84
" Equipment Supported from Block Walls" This is Detroit Edison's final report of Item 84, " Equipment Supported from Block Walls".
Item 84 was originally reported as a potential deficiency on December 13, 1982, and subsequently documented in References (3), (4) and (5 ).
Description of Deficiency During the installation of the Fire Protection / Detection, Security and Communications Systems, it was discovered that some of this equipment had been attached to masonry walls in safety related areas of the Reactor and Auxiliary buildings.
oh0hh2 PDk SEP1 7m a> E47 o
3 o
a Mr.' James G. Keppler j
' September 12, 1984 EF2-69282 l
Page 2 Subsequently, during a walkdown by qualified structural engineers to locate all items attached to masonry walls, safety related tubing and a safety related thermostat were found attached to masonry walls.
Such installations con-flict with Edison's response to NRC Bulletin 80-11 (Refer-
- e nce 2 ).
This response states, in part, that piping and equipment shall not be supported on block walls.
Where items are installed on the walls, they must either weigh less than 2% of the wall weight or be included in the design calculatio ns.
Analysis of Safety Implications In locations where safety related items are mounted on block.
walls, there is a potential for loss of support for these safety related items.
Because unauthorized additions add unanalyzed loads to the masonry walls, the structural integrity of the walls during a seismic event is indeterminate.
This may result in failure of the wall and danage to any equipment located on or near these walls.
Corrective Action The following actions were taken to correct the deficiency and prevent recurre nce :
o Plant walkdowns were performed by qualified structural engineers to locate all items attached to the masonry walls.
All safety-related items attached to masonry walls were removed.
A subsequent walkdown confirmed that the problem was not rec urri ng.
o For items lef t on masonry walls, the design calcula-tions were revised to account for the additional equip-ment loads.
These calculations assure the structural integrity of the walls for design seismic event condi-tio ns (Seismic Class II/I).
o Design changes were issued as required to provide additional wall bracing or-to remove heavy items.
o Edison Engineering and Contractor Supervisory personnel have been instructed that no safety related items'shall be attached to any masonry wall and that no item shall be attached to seismically designed masonry walls without prior structural review.
E~~.
4 Mr.. James G.
Keppler September 12, 1984 EF2-69282 Page 3 o
Erection specifications.for field run piping, tubing and conduit'have~been revised to prohibit attachments
-to block walls without specific approval.
o-Edison has.re-emphasized Engineering work procedures which require seismic analysis and approval of every design. change that could affect or have proximate effect on the structural integrity of a safety'related structure.
This is Detroit Edison's final report on this item.
If'you have questions concerning this matter, please contact Mr. Lewis P.
Bregni, (313) 586-5083.
Sincerely,
-L cc:
Mr.
P.
M.
Byron Mr.
R.
C.
DeYoung Mr.
R.
C.
Knop hl.