ML20095L353
| ML20095L353 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 08/14/1984 |
| From: | Jens W DETROIT EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 37, EF2-69673, NUDOCS 8408300216 | |
| Download: ML20095L353 (2) | |
Text
g
- - -_ y +:
-? * -
Cayne H. Jens
,s
.p-
. %ce President.
Nudsar Operatens y
f
' Formi-2 6400 North DEie Highway eN "3i1$$77"**
Auguat 14, 1984 EF2-69673 Mr. James G.
Keppler Regional Administrator
' Region III U.
S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137
Dear Mr. Keppler:
References (1)
Fermi 2 NRC Docket No. 50-341
.(2)
- Letter, E.
Hines to J.
G.
- Keppler, January 29, 1981, EF2-49878 (3)
- Letter, D.
A. Wells to J.
G.
- Keppler, May 15, 1981, EF2-4997 0
( 4)
- Letter, D. A. Wells to J. G. Keppi September 2 5, 1981, EF2-54146 (5)
- Letter, D. A. Wells to J. G. Keppler, January 8, 1982, EF2-55870 (6)
- Letter, D. A. Wells to J.
G.
- Keppler, April 27, 1982, EF2-57 468 (7)
- Letter, D. A. Wells to J.
G.
- Keppler, August 27, 1982, EF2-59387 (8)
- Letter, D. A. Wells to J. G. Keppler, April 15, 1983, EF2-63 499
Subject:
Final Report of 10CFR50. 55(e) Item 37
" Fisher Control Valve Actuators" This is Detroit Edison's final report concerning Fisher control valve actuators.
Item 37 was originally reported as a potential deficiency on December 31, 1980, and was subsequently documented in References (2) through (8).
4 8408300216 840814 PDR ADOCM 05000341 gG 20.@
p L
2,-
6 Mr.' James G.
Keppler
. August 14,1 1984 EF2-69673 Page 2 Descciption of Deficiency Control valves were purchased from Fisher Controls to Detroit Edison specifications.
During our seismic review process, Detroit Edison determined that ten Fisher control valve actuators could not meet seismic criteria.
Cut-off frequencies had not been adequately specified to assure that seismic design of the valves was adequate for the Fermi 2 peak response frequency.
Analysis of Safety Implications Safety-related valves with actuators which did not meet seismic criteria could not be assumed to operate during or after the design seismic event.
Corrective Action The following actions have.been taken to correct this deficiency and prevent recurrences o
Detroit Edison engineering specifications were revised to include valve natural frequency criteria and to update seismic analysis requirements.
o Eight new Fisher actuators which meet the revised specification were purchased and installed to replace the old actuators.
Two of the ten affected valves were deleted due to modifications to delete the RIIR steam condensing mode.
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,
(
cc:
Mr.
P. M. Byron
[44({
Mr.
R. C. DeYoung Mr.
R. C. Knop
,