TXX-9428, Submits Results of Insp as Described in Re NRC Bulletin 88-009, Thimble Tube Thinning in Westinghouse Reactors. Thimble Tube Insps Completed at CPSES Unit 2 on 941018
| ML20078E542 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 11/07/1994 |
| From: | Terry C, Walker R TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-88-009, IEB-88-9, TXX-94289, NUDOCS 9411140141 | |
| Download: ML20078E542 (3) | |
Text
'
d r
Log # TXX-94289 5:27 T :"
File # 10119 7
904.4
~
Ref. # NRCB 88-09 TUELECTRIC c L= w. T ury November 7, 1994 Group Vke President U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
UNIT 2 DOCKET N0. 50 446 THIMBLE TUBE THINNING IN WESTINGHOUSE REACTORS REF:
TU Electric Letter logged TXX-89781, from William J. Cahill, Jr.
to the NRC. dated November 2, 1989.
Gentlemen:
The NRC Bulletin 88-09 " Thimble Tube Thinning in Westinghouse Reactors."
discusses thimble tube wear resulting from flow-induced vibration for Westinghouse reactors with bottom mounted instrumentation. As a result of this bulletin, TU Electric established an inspection program to monitor thimble tube performance. Thimble tube inspections were completed at CPSES Unit 2 on October 18. 1994. This letter reports the results of the inspection as described in the referenced correspondence.
Each of the S8 thimble tubes was subjected to a multi frequency eddy current examination over its entire length.
Five tubes exhibited detectable wear.
The thimble tube at core location K-02 had an indicated thru-wall wear at 21*:
the tube at core location E-09 had indicated thru-wall wear of 24*: the tube at core location P-09 had an indicated thru wall wear of 22%. the tube at location H 11 had an indicated thru-wall wear of 33*: and the tube at core location H 15 had an indicated thru-wall wear of 68%.
All indications were evaluated and determined to be acceptable for continued service in accordance with site approved procedures; however, tube H 15 will be taken out of service as its predicted wear is close to the acceptance criteria. Each thimble tube will be re-examined at its next periodic inspection interval.
400;:o 9411140141 941107
.g I
PDR ADOCK 05000446 m ouve t_a st N ias.Te m n 201 Q
PDR I
1
+
TXX t)4289
' Page 2 of 2 If there are any questions, please contact Carl Corbin at (214) 812 8859.
Sincerely.
C. L. Terry By:_
M Roger (T. Walker Regulatory Affairs Manager CBC/vid Attachment c-Mr. L. J. Callan, Region IV Mr. D. D. Chamberlain, Region IV Resident Inspectors (2)
Mr. Tim Polich, NRR
e 6
Attachment to TXX-94289 Page 1 of 1 UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the Matter of
)
)
Texas Utilities Electric Company
)
Docket No. 50-446
)
(Comanche Peak Steam Electric
)
Station, Unit 2
)
Roger D. Walker being duly sworn, hereby deposes and says that he is Regulatory Affairs Manager of TU Electric, the licensee herein: that he is duly authorized to sign and file with the Nuclear Regulatory Commission this response to NRC Bulletin 88 09 for the captioned facility; and that the matters set forth therein are true and correct to the best of his knowledge, information and belief.
b Roger"D. Walker Regulatory Affairs Manager STATE OF TEXAS
)
)
COUNTY OF DALLAS
)
Subscribed and sworn to before me, on this 7+h day of November 1994.
_L 0
^
{
Notary blic
,gi ~5 Gayle R. Peck wama g& __
l l
l l