ML20134F262
| ML20134F262 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 10/28/1996 |
| From: | Terry C TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-96-001, IEB-96-1, TXX-96490, NUDOCS 9611050107 | |
| Download: ML20134F262 (3) | |
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Log # TXX-96490 P9 File # 10119 Ref. # NRCB 96 01 RIELECTRIC' October 28, 1996 g,,
Gnmp Vwe President U. S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 l
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SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES) l DOCKET NOS. 50 445 AND 50 446 SUPPLEMENTAL RESPONSE TO NRC BULLETIN NO. 96 01 i
CONTROL R00 INSERTION PROBLEMS REF:
l Gentlemen:
TU Electric responded to NRC Bulletin 96 01 via References 1 and 2.
t Requested Action (3) from the bulletin required that TV Electric measure and evaluate at each outage of sufficient duration during calendar year 1996 (end of cycle, maintenance, etc.) the control rod drop times and rod recoil data for all control rods, and if appropriate plant conditions exist where the vessel head is removed, measure' and evaluate drag forces for all rodded fuel assemblies.
Requested Action (4) from the bulletin required that for each reactor trip during calendar year 1996. TV Electric verify that all control rods promptly fully inserted (bottomed) and obtain other available information to assess the operability and any performance trend of the rods.
TV Electric obtained rod drop times and rod recoil data for Unit 2 Cycle 3 following the September 18, 1996, reactor trip on Unit 2 and the results are included in Attachment 1.
The results were compared to those obtained at the beginning of Cycle 3 on Unit 2 and no observable trends were identified.
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P. O. Box 1002 Glen Rose Texas 76043 a
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TXX 96490 Page 2 of 2 l
Following the Unit 2 reactor trip on September 18, 1996, all control rods promptly fully inserted (bottomed), and other. indications demonstrated continued control rod operability. During the rod drop time measurements.
each Rod Cluster Control Assembly (RCCA) that was tested exhibited a minimum of two recoils. Rod drop times were not obtained for RCCAs in shutdown bank *B' due to problems with the step counters.
Performing rod drop times for shutdown bank 'B' following repair of the step counters would have restrained reactor restart.
t Sincerely, e,i Q l
C. L. Terry By:
M R. D.'falker i
Regulatory Affairs Manager GLM/grp Attachment c-Mr. L, J. Callan, Region IV Mr. J. I. Tapia, Region IV Resident Inspectors. (CPSES)
Mr. T. J. Polich, NRR
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I Comanche Peak - Unit 2, Cycle 03 l
Seginning of Cycle Red Drop 19-Sep.96 Red Core Assus Burump Thee Burmsp
'Ihme Delta Bank 1Ag El Fuel Tvar (MWDMrth (ang)
(MWD /MTL4 (asEl (ass) l CBA H6 DD81 Westinghouse *1mprover Zirc4 23184 1.45 28958 1.48 0.03 CBA K8 DD78 Westmghouse " Improver Zirc-4 23209 1.44 28783 1.45 0.01 CBA F8 DD68 Westinghouse " Improver Zirc-4 22974 1.47 28745 1.48 0.01 CBA H10 DD71 Westmghouse *1mprove& Zirc4 23238 1.44 28924 1.46 0.02 l
CBB K2 DD02 Westinghouse " Improver Zirc4 21931 1.45 26868 1.44
-0.01 l
CBB F2 DD34 W= ---?- -- " Improve & Zirc-4 22363 1.45 27197 1.46 0.01 l
CBB P6 DD42 We T--
-" Improver Zirc-4 21828 1.46 26654 1.46 0.00 I
CBB B6 DD46 Westinghouse *1mprove& Zirc-4 22305 1.44 27254 1.43
-0.01 f
CBB PIO DD16 Westinghouse ' Improver Zirc-4 21897 1.44 26671 1.43
-0.01 CBB B10 DD33 Westinghouse *1mprover Zirc4 22264 1.45 27239 1.46 0.01 Waak %#1mprove& Zirc-4 22209 1.45 27034 1.46 0 01 CBB Kid DD26 2
l CBB F14 DDil Westinghouse *1mprover Zirc4 22068 1.45 27101 1.46 0.01 CBC H2 DD52 Westmghouse " Improver Zirc-4 20895 1.47 26251 1.46
-0.01 CBC K6 DD86 Westinghouse *1mprover Zirc 4 21034 1.45 26966 1.45 0.00 j
CBC F6 DD67 Westinghouse " Improver Zirc-4 20667 1.46 26574 1.45
-0.01 CBC P8 DD87 Westinghouse
- Improve & Zirc4 21281 1.44 26431 1.46 0.02 CBC B8 DD85 Westmghouse *1mprover Zirc-4 20375 1.44 25724 1.46 0.02 CBC K10 DD72 Westinghouse " Improver Zirc-4 20990 1.45 26794 1.45 0.00 CBC F10 DD77 Westinghouse *1mprover Zirc4 21020 1.44 27011 1.45 0.01 CBC H14 DD50 Westmghouse *1mprove& Zirc-4 20456 1.47 25695 1.48 0.01 l
CBD M4 DD38 Westinghouse " Improver Zirc4 22814 1.45 27992 1.44
-0.01 CBD D4 DD37 Westinghouse ' Improver Zirc4 22690 1.45 27916 1.46 0.01 l
CBD H8 CC56 Westinghouse "Standar& Zirc-4 21219 1.49 26272 1.49 0.00 I
CBD M12 DD41 Westinghouse *1mprove& Zirc-4 22816 1.46 28028 1.46 0.00 l
CBD D12 DD28 Westinghouse *1mprove& Zirc-4 22578 1.44 27949 1.45 0.01 Wa*6 b#1mprover Zirc-4 22633 1.49 25975 1.5 0.01 SBA M2 DD55 2
SBA D2 DD64 Westinghouse ' Improve & Zirc-4 22484 1.48 25645 1.5 0.02 SBA P4 DD75 Westinghouse *1mprover Zirc-4 22686 1.45 25929 1.47 0.02 i
SBA B4 DD49 Westinghouse " Improver Zirc-4 22694 1.46 25989 1.47 0.01 SBA P12 DD57 Westinghouse
- Improve & Zirc4 22713 1.43 25906 1.47 0.04 SBA B12 DD79 Wesinghouse *1mprover Zirc4 22635 1.45 25990 1.47 0.02 SBA M14 DD69 Westmghouse " Improver Zirc4 22900 1.48 26128 1.5 0.02 J
SBA Dl4 DD62 Westinghouse *1mprover Zirc4 22951 1.45 26256 1.48 0.03 1
SBB J3 DD0' Westinghouse " Improver Zirc4 18235 1.44 23803 NA NA SBB G3 0006 Westinghouse ' Improver Zirc-4 18645 1.44 24199 NA NA SBB N7 DDl?
Westinghouse " Improver Zirc-4 17748 1.46 23155 NA NA SBB C7 DD03 Westinghouse *1mprove& Zirc4 17765 1.47 23442 NA NA i
SBB N9 DD12 Westinghouse ' Improver Zirc-4 18076 1.47 23441 NA NA SBB C9 DD24 Westinghouse ' Improve & Zirc-4 18065 1.45 23709 NA NA SBB J13 DD30 W===? r-:' Improver Zirc4 17855 1.46 23350 NA NA SBB G13 DD27 Westinghouse ' Improve & Zirc-4 17710 1.46 23294 NA NA SBC E3 DD70 Westinghouse ' Improved
- Zirc-4 13933 1.45 19819 1.47 0.02 j
SBC N5 DD63 Westinghouse *1mproved" Zirc-4 14308 1.45 20222 1.46 0.01 l
SBC Cll DD54 Westinghouse *1mprover Zirc4 13740 1.49 19966 1.52 0 03 l-SBC L13 DD61 Westinghouse " Improver Zirc4 14355 1.42 20343 1.42 0.00 l
SBD 1.3 DD74 Westinghouse *1mprover Zirc4 14072 1.45 20102 1.47 0.02 l
SBD C5 DD51 Westinghouse *1mprover Zirc4 14229 1.46 20318 1.47 0.01 SBD Nil DD60 Westinghouse ' Improver Zirc4 14312 1.44 20281 1.45 0.01 SBD E13 DD80 Westinghouse *1mprover Zirc4 14134 1.45 20283 1.48 0.03 SBE H4 DD35 Westinghouse *1mprover Zirc4 21928 1.45 27344 1.46 0.01 SBE M8 DD43 Westinghouse *1mprover Zirc-4 21751 1.46 26903 1.47 0.01 SBE D8 DD48 Westinghouse
- Improve & Zirc4 21891 1.43 27310 1.44 0.01 SBE H12 DD36 Westinghouse " Improve & Zirc4 21940 1.45 27218 1.45 0.00 Average Red Drop Time:
1.454 1.463 4
Standard Devistlos:
0.015 0.020 l