ML20132D894
| ML20132D894 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 12/13/1996 |
| From: | Shell R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-96-001, IEB-96-1, NUDOCS 9612200182 | |
| Download: ML20132D894 (6) | |
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nn Tennessee Valley Authonty Post Off.ce Bra 2000. Soddy Da+y Tennessee 37379 December 13,1996 J
U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:
In the Matter of
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Docket Nos. 50-327 Tennessee Valley Authority
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SEQUOYAH NUCLEAR PLANT (SON) - NRC BULLETIN 96-01, " CONTROL ROD INSERTION PROBLEMS" REPORT l
Reference:
TVA letter to NRC dated April 5,1996, Sequoyah Nuclear Plant (SON) and Watts Bar Nuclear Plant (WBN) Response To NRC Bulletin 96-01,
" Control Rod Insertion Problems" dated March 8,1996 I
TVA is providing the rod-drop time data for the recent Unit 1 maintenance outage of November 1996, as committed in response to NRC Bulletin 96-01. The data for the rod-drop tests performed on November 17,1996, and the fuel burnup times are included as an enclosure to this letter. The rod-drop times and fuel burnup for each rodded fuel assembly at the start of the Unit 1 Cycle 8 operation is also included for comparison. The rod-drop times measured were shorter than the corresponding times recorded at the beginning of the fuel cycle. This change is most probably due to the measuring inaccuracies of the test as opposed to any real changes in rod-drop time.
The rod-drop times for both data dates were well within the required time limit of less than 2.7 seconds. The control and shutdown rods exhibited rod recoil during the November test. During the reactor trip initiated on November 16,1996, all rods fully inserted into the core with no observed discrepancies.
I 200018 9612200182 961213 PDR ADOCK 05000327 G
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1 U.S. Nuclear Regulatory Commission Page 2
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December 13,1996 i
Please direct questions concerning this issue to Keith Weller at (423) 843-7527.
Sincerely, hen
- R. H. Shell Manager SON Site Licensing and Industry Affairs Sworn to and subscribed pefore mg this /35 day of JUrnsyxhst) 1996 DNA) $.
_AYJuYMA Notary Public My Commission Expires /o20/[9Er' i
t Enclosure l
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U.S. Nuclear Regulatory Commission Page 3 December 13,1996 i
cc (Enclosure).
Mr. R. W. Hernan, Project Manager Nuclear Regulatory Commission One White Flir.t, North 11555 Rockville Pike Rockville, Maryland 20852-2739 NRC Resident inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy-Daisy, Tennessee 37379-2000 Regional Administrator U.S. Nuclear Regulatory Commission Region ll 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323-2711 j
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ENCLOSURE SEQUOYAH NUCLEAR PLANT UNIT 1 MAINTENANCE OUTAGE, NOVEMBER 1996 Unit 1 Cycle 8 Burnup vs Rod Position i
ROD BURNUP TYPE DROP TIMES Sec 11/08/95 11/15/96 11/08/95 11/17/96 SA D14 33897.43 40896.03 STD 1.6 1.34 SA B12 33551.2 40535.45 STD 1.5 1.26 SA M14 33709.7 40719.74 STD 1.6 1.38 SA P12 33876.41 40884.72 STD 1.7 1.26 SA P4 33427.16 40428.23 STD 3.6 1.26 SA M2 33764.09 40774.31 STD 1.7 1.38 4
SA D2 33870.27 40861.33 STD 1.6 1.36 SA B4 34438.82 41503.49 STD 1.7 1.26 SB J13 17712.19 30594.04 V5H 1.6 1.26 SB G13 17781.48 30770.54 V5H 1.6 1.28 i
SB N9 17774.65 30758.71 V5H 1.5 1.24 SB N7 17811.04 30764.78 V5H 1.6 1.26 SB C9 17845.39 30824.12 V5H 1.6 1.28 SB C7 17747.36 30711.49 V5H 1.6 1.25 SB J3 17778.06 30764.62 V5H 1.6 1.28 SB G3 17845.39 30824.12 V5H 1.6 1.28 SC L13 0 16551.23 V5H 1.5 1.28 SC C11 0 16553.22 V5H 1.3 1.26 SC N5 0
16563.6 V5H 1.6 1.32 SC E3 0 16556.93 V5H 1.7 1.28 SD E13 0 16578.52 V5H 1.5 1.28 SD N11 0 16581.63 V5H 1.5 1.24 SD C5 0 16561.56 V5H 1.6 1.26 SD L3 0 16579.52 V5H 1.6 1.28 i
CA K8 0
17074.5 V5H 1.7 1.28 CA H10 0 17053.42 V5H 1.4 1.28 CA H6 0 17037.23 V5H 1.6 1.24 CA F8 0 17041.89 V5H 1.7 1.28 CB K14 0 15066.76 V5H 1.7 1.39 CB F14 0 15096.67 V5H 1.6 1.36 CB P10 0 15071.86 V5H 1.6 1.24 CB B10 0 15069.58 V5H 1.6 1.24 CB P6 0 15105.77 V5H 1.7 1.3 CB B6 0 15132.59 V5H 1.6 1.34 CB K2 0 15072.58 V5H 1.7 1.34 CB F2 0 15106.19 V5H 1.7 1.33 CC H2 0
15374.8 V5H 1.6 1.31 CC K6 19381.43 33233.85 V5H 1.7 1.28 CC F6 19376.64 33225.63 V5H 1.7 1.26 CC P8 0 15381.94 V5H 1.6 1.26 CC B8 0 15358.22 V5H 1.6 1.26 CC K10 19393.16 33253.97 V5H 1.6 1.34 CC F10 19390.82 33249.95 V5H 1.6 1.26 CC H14 0 15362.35 V5H 1.7 1.3
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Unit 1 Cycle 8 Burnup vs Rod Position ROD BURNUP TYPE DROP TIMES Sec 11/08/95 11/15/96 11/08/95 11/17/96 CD M12 16382.61 31484.21 V5H 1.7 1.25 CD H12 0 16896.21 V5H 1.6 1.26 CD D12 16390.4 31499.18 V5H 1.6 1.26 CD M8 0 16925.41 V5H 1.6 1.26 CD.H8 18049.41 32097.08 V5H 1.6 1.38 CD D8 0
16876 V5H 1.6 1.26 CD M4 16392.24 31502.71 V5H 1.6 1.28 CD H4 0 16882.97 V5H 1.6 1.26 CD D4 16396.02 31509.98 V5H 1.7 1.28
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U.S. Nuclear Regulatory Commission Page 3 -
December 13,1996 I
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JDS:KCW:EAM cc (Enclosure):
I Mr. R. W. Hernan, Project Manager Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852-2739 NRC Resident inspector Sequoyah Nuclear Plant 2600 lgou Ferry Road j
Soddy-Daisy, Tennessee 37379-2000 i
l Regional Administrator U.S. Nuclear Regulatory Commission Region 11 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323-2711 R. J. Adney, OPS 4A-SON R. R. Baron, BR 4J-C P. P. Carier, BR 4J-C E. S. Christenbury, ET 10A-K M. J. Fecht, OPS 4A-SON K. N. Harris, LP 6A-C J. T. Herron, POB 28-SON '
T. J. McGrath, LP 3B-C M. O. Medford, LP 6A-C J. R. Rupert, OPS 4A-SON K.W. Whittenburg, BR 4F-C O. J. Zerinaue, LP 6A-C RIMS, WT 38-K i
rpt9601.r3 i
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