ML20134M561
| ML20134M561 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 11/13/1996 |
| From: | Schnell D UNION ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-96-001, IEB-96-1, ULNRC-3489, NUDOCS 9611250157 | |
| Download: ML20134M561 (5) | |
Text
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1901 Choutdau Avenue Post Office Box 149
- St. Louis Missouri 63166 314-554-2650 Union o~'" s"~"
ELECTRIC Senior Vice President November 13, 1996 Nuclear h5 I
.U.S.
Nuclear Regulatory Commission ATTN:
Document Control Desk Mail Station P1-137 Washington, D.C.
20555 Gentlemen:
ULNRC-3 4 89 i
DOCKET NUMBER 50-483 CALLAWAY PLANT NRC BULLETIN 96-01
References:
- 1) ULNRC-3360, dated April 4, 1996
- 2) NRC Letter dated September 4, 1996
- 3) ULNRC-3447 dated September 20, 1996
- 4) ULNRC-3454 dated September 27, 1996
- 5) ULNRC-3455 dated September 30, 1996
- 6) NRC Letter dated October 7, 1996
- 7) ULNRC-3472 dated October.1,, 1996 5
The referenced letters provided Union Electric's response and NRC's evaluation with respect to Bulletin 96-01, " Control Rod Insertion Problems" for Callaway Plant.
Reference 7 provided the rod drop times that were obtained at the end of cycle (EOC) 8.
References 4, 6 and 7 defined the scope of drag testing for EOC 8, totaling 23 assemblies.
The Attachment to this letter provides the drag test data obtained.
This testing was performed in the reactor vessel with the upper internals in place.
Maximum values for the dashpot and guide thimble regions are provided.
It should be noted that, based upon Westinghouse experience, the testing method used (in vessel testing with drive shafts / internals in place) provides results that are biased to the high side.
I g Based on an evaluation by Westinghouse, these
' 'i \\ 'pfi' readings are consistent with the data base for those 3
plants which have not experienced insertion anomalies.
g(($f The highest drag recorded was the center fuel assembly (H78) which also reached the highest burnup of approximately 48,100 MWD /MTU.
The maximum drag for this 9611250157 961113 PDR ADOCK 05000483 G
i U.S. Nuclecr R gulctory Commission November 13, 1996 Page 2 assembly was 78' pounds in the dashpot and 42 pounds in the guide thimbles.
Although the thimble drag is above the guidelines of Westinghouse Specification F-5.1,
" Instructions, Precautions and Limitations for Handling Rod Cluster Control Assemblies and Core Component Assemblies", there is no concern for an insertion anomaly.
This is supported by data which shows that for plants which exceeded only one of the guidelines, control rods have inserted normally in all cases.
Furthermore, the rod drop time to turnaround for assembly H78 measured at EOC 8 was 2.3 seconds, well below Technical Specification limits.
Assembly H78 is a discharge assembly and will not be used in any future cycles.
All other fuel assemblies were well within both F-5.1 guidelines and are consistent with previous observations of irradiated fuel assemblies at similar burnups.
l Based upon a review of the drag test data and rod drop times, there are no indications of concern for an insertion anomaly at Callaway.
If you have any questions or concerns, please l
contact us.
Very truly yours, 4Y M e Donald F. Schnell P
DES /plr l
STATE'OF MISSOURI
)'
)-
)
Alan C.
Passwater, of lawful age, being first duly sworn upon oath says that he_is Manager, Licensing and Fuels (Nuclear) for. Union Electric Company; that'he has read the
. foregoing document and knows the content thereof; that'he has
-executed.the same for and on behalf of said company with full power and authority to do so; and that the facts therein stated are true and correct to the best of his knowledge, information and belief.
By Alan C.
Passwater
-Manager,. Licensing and Fuels Nuclear BS E
' sworn to bef me this
- day
&L$hhj f/
['
f(/
BARBARA J. PFAFF NOTARY PUBLIC-STATE OF MISSOURI MY COMMISSION EXPIRES APRIL 22, 1997 ST, LOUIS COUNTY.
L Attachment '
ULNRC-34 89 e
CALLAWAY PLANT CYCLE 8 EOC DRAG TEST RESULTS CORE ASSY PEAK DRAG-IN PEAK DRAG-OUT LOCATION ID DASHPOT OF DASHPOT (in Ibs force)
(in Ibs force)
P4 J44 16 12 P12 J30 18 8
N9 K92 22 16 N7 K94 28 10 M2 J29 16 6
M4 J12 60 10 M12 J55 52 10 M14 J15 16 10 K6 K78 48 18 J13 K81 14 10 J3 K83 38 12 H8 H78 78 42 G13 K93 14 24 G3 K86 18 22 F6 K79 50 32 D2 J32 24 28 D4 J19 32 16 D12 J20 16 16 D14 J14 46 36 C9 K85 26 18 C7 K96 46 30 B4 J40 20 10 B12 J52 24 12
. -. -..... ~.. - -
. - _. - -.....~.,
~
i cc:
M. H. Fletcher.
Professional Nuclear Consulting, Inc.
19041 Raines Drive Derwood, MD 20855-2432 L. Joe Callan Regional Administrator I
U.S. Nuclear Regulatory Commission Region IV l
611 Ryan Plaza Drive l
Suite 400 Arlington, TX' 76011-8064 i
Senior Resident Inspector
~
Callaway Resident Office U.S. Nuclear Regulatory Commission 8201 NRC-Road
-Steedman, MO 65077 Kristine M. Thomas (2)
Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission 1 White Flint, North, Mail Stop 13E16 i
11555 Rockville Pike Rockville, MD 20852-2738 I
l.
Manager, Electric Department Missouri Public Service Commission l
P.O. Box 360 l
Jefferson City, MO 65102 i
Ron Kucera i
i Department of Natural Resources P.O. Box 176 Jefferson City, MO 65102 Don Woodlan TU Electric 1601 Bryan Street Dallas, TX 75201-3411 Pat Nugent Pacific Gas & Electric Regulatory Services P.O. Box 56 Avila Beach, CA 93424 2
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